In-Situ/Operando⁵⁷Fe Mössbauer Spectroscopic Technique and Its Applications in NiFe-based Electrocatalysts for Oxygen Evolution Reaction

Authors

Jafar Hussain Shah, 1. Center for Advanced Mössbauer Spectroscopy, Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
Qi-Xian Xie, 2. Institute of Photoelectronic Thin Film Devices and Technology, Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Ministry of Education Engineering Research Center of Thin Film Photoelectronic Technology, Renewable Energy Conversion and Storage Center, Nankai University, Tianjin 300350, China;
Zhi-Chong Kuang, 1. Center for Advanced Mössbauer Spectroscopy, Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
Ri-Le Ge, 1. Center for Advanced Mössbauer Spectroscopy, Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
Wen-Hui Zhou, 1. Center for Advanced Mössbauer Spectroscopy, Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
Duo-Rong Liu, 1. Center for Advanced Mössbauer Spectroscopy, Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
Alexandre I. Rykov, 1. Center for Advanced Mössbauer Spectroscopy, Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
Xu-Ning Li, 1. Center for Advanced Mössbauer Spectroscopy, Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
Jing-Shan Luo, 2. Institute of Photoelectronic Thin Film Devices and Technology, Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Ministry of Education Engineering Research Center of Thin Film Photoelectronic Technology, Renewable Energy Conversion and Storage Center, Nankai University, Tianjin 300350, China;
Jun-Hu Wang, 1. Center for Advanced Mössbauer Spectroscopy, Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;Follow

Corresponding Author

Jun-Hu Wang(wangjh@dicp.ac.cn)

Abstract

The development of highly efficient and cost-effective electrocatalysts for the sluggish oxygen evolution reaction (OER) remains a significant barrier to establish effective utilization of renewable energy storage systems and water splitting to produce clean fuel. The current status of the research in developing OER catalysts shows that NiFe-based oxygen evolution catalysts (OECs) have been proven as excellent and remarkable candidates for this purpose. But it is critically important to understand the factors that influence their activity and underlying mechanism for the development of state-of-the-art OER catalysts. Therefore, the development of in-situ/operando characterizations is urgently required to detect key intermediates along with active sites and phases responsible for OER. 57Fe Mössbauer spectroscopy is one of the appropriate and suitable techniques for determining the phase structure of catalysts under their electrochemical working conditions, identifying the active sites, clarifying the catalytic mechanisms, and determining the relationship between catalytic activity and the coordination structure of catalysts. In this tutorial review, we have discussed the current status of research on NiFe-based catalysts with particular attention to introduce in detail the knowhow about the development and utilization of in-situ/operando57Fe Mössbauer-electrochemical spectroscopy for the study of OER mechanism. A brief overview using NiFe-(oxy)hydroxide catalysts, derived from ordered porous metal-organic framework (MOF) material NiFe-PBAs (Prussian blue analogues), as a typical model study case for the OER electrocatalyst and self-designed in-situ/operando57Fe Mössbauer-electrochemical instrument, has been provided for the better understanding of readers. Moreover, using in-situ/operando57Fe Mössbauer spectroscopy, the crucial role of Fe species during OER reaction has been explained very well.

Graphical Abstract

Keywords

oxygen evolution reaction, NiFe-(oxy)hydroxide electrocatalyst, NiFe Prussian blue analogue, in-situ/operando57Fe Mössbauer spectroscopy, key intermediate detection

DOI Link

https://doi.org/10.13208/j.electrochem.210854

Publication Date

2022-03-28

Online Available Date

2022-12-31

Revised Date

2022-01-24

Received Date

2021-12-14

Recommended Citation

Jafar Hussain Shah, Qi-Xian Xie, Zhi-Chong Kuang, Ri-Le Ge, Wen-Hui Zhou, Duo-Rong Liu, Alexandre I. Rykov, Xu-Ning Li, Jing-Shan Luo, Jun-Hu Wang. In-Situ/Operando⁵⁷Fe Mössbauer Spectroscopic Technique and Its Applications in NiFe-based Electrocatalysts for Oxygen Evolution Reaction[J]. Journal of Electrochemistry, 2022 , 28(3): 210854.
DOI: 10.13208/j.electrochem.210854
Available at: https://jelectrochem.xmu.edu.cn/journal/vol28/iss3/3

References

[1] Chu S, Majumdar A. Opportunities and challenges for a sustainable energy future[J]. Nature, 2012, 488(7411):294-303.
doi: 10.1038/nature11475 URL

[2] Fu J, Cano Z P, Park M G, Yu A, Fowler M, Chen Z W. Electrically rechargeable zinc-air batteries: progress, challenges, and perspectives[J]. Adv. Mater., 2017, 29(7):1604685.
doi: 10.1002/adma.201604685 URL

[3] Zhang H W, Shen P K. Recent development of polymer electrolyte membranes for fuel cells[J]. Chem. Rev., 2012, 112(5):2780-2832.
doi: 10.1021/cr200035s URL

[4] Jiao K, Xuan J, Du Q, Bao Z M, Xie B A, Wang B W, Zhao Y, Fan L H, Wang H Z, Hou Z L, Huo S, Brandon N P, Yin Y, Guiver M D. Designing the next generation of proton-exchange membrane fuel cells[J]. Nature, 2021, 595(7867):361-369.
doi: 10.1038/s41586-021-03482-7 URL

[5] Johnson D, Qiao Z, Djire A. Progress and challenges of carbon dioxide reduction reaction on transition metal based electrocatalysts[J]. ACS Appl. Energy Mater., 2021, 4(9):8661-8684.
doi: 10.1021/acsaem.1c01624 URL

[6] Li Y J, Sun Y J, Qin Y N, Zhang W Y, Wang L, Luo M C, Yang H, Guo S J. Recent advances on water-splitting electrocatalysis mediated by noble-metal-based nanostructured materials[J]. Adv. Energy Mater., 2020, 10(11):1903120.
doi: 10.1002/aenm.201903120 URL

[7] Li J C, Kuang Y, Meng Y T, Tian X, Hung W H, Zhang X, Li A W, Xu M Q, Zhou W, Ku C S, Chiang C Y, Zhu G Z, Guo J Y, Sun X M, Dai H J. Electroreduction of CO₂ to formate on a copper-based electrocatalyst at high pressures with high energy conversion efficiency[J]. J. Am. Chem. Soc., 2020, 142(16):7276-7282.
doi: 10.1021/jacs.0c00122 URL

[8] Wang M Y, Wang Z, Gong X Z, Guo Z C. The intensification technologies to water electrolysis for hydrogen production-A review[J]. Renew. Sust. Energ. Rev., 2014, 29:573-588.
doi: 10.1016/j.rser.2013.08.090 URL

[9] Mei L, Gao X P, Gao Z, Zhang Q Y, Yu X G, Rogach A L, Zeng Z Y. Size-selective synjournal of platinum nanoparticles on transition-metal dichalcogenides for the hydrogen evolution reaction[J]. Chem. Commun., 2021, 57(23):2879-2882.
doi: 10.1039/D0CC08091H URL

[10] Yu J, He Q J, Yang G M, Zhou W, Shao Z P, Ni M. Recent advances and prospective in ruthenium-based materials for electrochemical water splitting[J]. ACS Catal., 2019, 9(11):9973-10011.
doi: 10.1021/acscatal.9b02457 URL

[11] Hu C L, Zhang L, Gong J L. Recent progress made in the mechanism comprehension and design of electrocatalysts for alkaline water splitting[J]. Energy Environ. Sci., 2019, 12(9):2620-2645.
doi: 10.1039/C9EE01202H URL

[12] Lyons M E G, Floquet S. Mechanism of oxygen reactions at porous oxide electrodes. Part 2-Oxygen evolution at RuO₂, IrO₂ and Ir_xRu₁-_xO₂ electrodes in aqueous acid and alkaline solution[J]. Phys. Chem. Chem. Phys., 2011, 13(12):5314-5335.
doi: 10.1039/c0cp02875d URL

[13] Hunter B M, Gray H B, Muller A M. Earth-abundant heterogeneous water oxidation catalysts[J]. Chem. Rev., 2016, 116(22):14120-14136.
pmid: 27797490

[14] Suen N T, Hung S F, Quan Q, Zhang N, Xu Y J, Chen H M. Electrocatalysis for the oxygen evolution reaction: recent development and future perspectives[J]. Chem. Soc. Rev., 2017, 46(2):337-365.
doi: 10.1039/C6CS00328A URL

[15] Lee Y, Suntivich J, May K J, Perry E E, Shao-Horn Y. Synjournal and activities of rutile IrO₂ and RuO₂ nanoparticles for oxygen evolution in acid and alkaline solutions[J]. J. Phys. Chem. Lett., 2012, 3(3):399-404.

[16] Blakemore J D, Schley N D, Kushner-Lenhoff M N, Winter A M, D’Souza F, Crabtree R H, Brudvig G W. Comparison of amorphous iridium water-oxidation electrocatalysts prepared from soluble precursors[J]. Inorg. Chem., 2012, 51(14):7749-7763.
doi: 10.1021/ic300764f pmid: 22725667

[17] Dionigi F, Zhu J, Zeng Z H, Merzdorf T, Sarodnik H, Gliech M, Pan L J, Li W X, Greeley J, Strasser P. Intrinsic electrocatalytic activity for oxygen evolution of crystalline 3d-transition metal layered double hydroxides[J]. Angew. Chem. Int. Edit., 2021, 60(26):14446-14457.
doi: 10.1002/anie.202100631 URL

[18] Han L, Dong S L, Wang E K. Transition-metal (Co, Ni, and Fe)-based electrocatalysts for the water oxidation reaction[J]. Adv. Mater., 2016, 28(42):9266-9291.
doi: 10.1002/adma.201602270 URL

[19] Zhang Q Y, Mei L, Cao X H, Tang Y X, Zeng Z Y. Intercalation and exfoliation chemistries of transition metal di-chalcogenides[J]. J. Mater. Chem. A, 2020, 8(31):15417-15444.
doi: 10.1039/D0TA03727C URL

[20] Han N, Liu P Y, Jiang J, Ai L H, Shao Z P, Liu S M. Recent advances in nanostructured metal nitrides for water splitting[J]. J. Mater. Chem. A, 2018, 6(41):19912-19933.
doi: 10.1039/C8TA06529B URL

[21] Zhang H J, Maijenburg A W, Li X P, Schweizer S L, Wehrspohn R B. Bifunctional heterostructured transition metal phosphides for efficient electrochemical water splitting[J]. Adv. Funct. Mater., 2020, 30(34):2003261.
doi: 10.1002/adfm.202003261 URL

[22] Gupta S, Patel M K, Miotello A, Patel N. Metal boride-based catalysts for electrochemical water-splitting: A review[J]. Adv. Funct. Mater., 2020, 30(1):1906481.
doi: 10.1002/adfm.201906481 URL

[23] Wang H P, Zhu S, Deng J W, Zhang W C, Feng Y Z, Ma J M. Transition metal carbides in electrocatalytic oxygen evolution reaction[J]. Chin. Chem. Lett., 2021, 32(1):291-298.
doi: 10.1016/j.cclet.2020.02.018 URL

[24] Zhang B, Zheng Y J, Ma T, Yang C D, Peng Y F, Zhou Z H, Zhou M, Li S, Wang Y H, Cheng C. Designing MOF nanoarchitectures for electrochemical water splitting[J]. Adv. Mater., 2021, 33(17):2006042.
doi: 10.1002/adma.202006042 URL

[25] Balogun M S, Huang Y C, Qiu W T, Yang H, Ji H B, Tong Y X. Updates on the development of nanostructured transition metal nitrides for electrochemical energy storage and water splitting[J]. Mater. Today, 2017, 20(8):425-451.
doi: 10.1016/j.mattod.2017.03.019 URL

[26] Jin S. Are metal chalcogenides, nitrides, and phosphides oxygen evolution catalysts or bifunctional catalysts?[J] ACS Energy Lett., 2017, 2(8):1937-1938.
doi: 10.1021/acsenergylett.7b00679 URL

[27] Dionigi F, Strasser, P. NiFe-based (oxy)hydroxide catalysts for oxygen evolution reaction in non-acidic electrolytes[J]. Adv. Energy Mater., 2016, 6(23):1600621.
doi: 10.1002/aenm.201600621 URL

[28] Gong M, Li Y G, Wang H L, Liang Y Y, Wu J Z, Zhou J G, Wang J, Regier T, Wei F, Dai H J. An advanced Ni-Fe layered double hydroxide electrocatalyst for water oxidation[J]. J. Am. Chem. Soc., 2013, 135(23):8452-8455.
doi: 10.1021/ja4027715 URL

[29] Subbaraman R, Tripkovic D, Chang K C, Strmcnik D, Paulikas A P, Hirunsit P, Chan M, Greeley J, Stamenkovic V, Markovic N M. Trends in activity for the water electrolyser reactions on 3d M (Ni, Co, Fe, Mn) hydr(oxy)oxide catalysts[J]. Nat. Mater., 2012, 11(6):550-557.
doi: 10.1038/nmat3313 pmid: 22561903

[30] Munshi M Z A, Tseung A C C, Parker J. The dissolution of iron from the negative material in pocket plate nickel-cadmium batteries[J]. J. Appl. Electrochem., 1985, 15(5):711-717.
doi: 10.1007/BF00620567 URL

[31] Tichenor R L. Nickel oxides-relation between electrochemical and foreign ion content[J]. J. Ind. Eng. Chem., 1952, 44(5), 973-977.
doi: 10.1021/ie50509a022 URL

[32] Corrigan D A. The catalysis of the oxygen evolution reaction by iron impurities in thin film nickel oxide electrodes[J]. J. Electrochem. Soc., 1987, 134(2):377-384.
doi: 10.1149/1.2100463 URL

[33] Zhu K Y, Liu H Y, Li M R, Li X N, Wang J H, Zhu X F, Yang W S. Atomic-scale topochemical preparation of crystalline Fe³⁺-doped β-Ni(OH)₂ for an ultrahigh-rate oxygen evolution reaction[J]. J. Mater. Chem. A, 2017, 5(17):7753-7758.
doi: 10.1039/C7TA01408B URL

[34] Stevens M B, Trang C D M, Enman L J, Deng J, Boettcher S W. Reactive Fe-sites in Ni/Fe(oxy)hydroxide are respon-sible for exceptional oxygen electrocatalysis activity[J]. J. Am. Chem. Soc., 2017, 139(33):11361-11364.
doi: 10.1021/jacs.7b07117 URL

[35] Młynarek G, Paszkiewicz M, Radniecka A. The effect of ferric ions on the behaviour of a nickelous hydroxide electrode[J]. J. Appl. Electrochem., 1984, 14(2):145-149.
doi: 10.1007/BF00618733 URL

[36] Trotochaud L, Young S L, Ranney J K, Boettcher S W. Nickel-iron oxyhydroxide oxygen-evolution electrocatalysts: the role of intentional and incidental iron incorporation[J]. J. Am. Chem. Soc., 2014, 136(18):6744-6753.
doi: 10.1021/ja502379c pmid: 24779732

[37] Görlin M, Chernev P, de Araújo J F, Reier T, Dresp S, Paul B, Krähnert R, Dau H, Strasser P. Oxygen evolution reaction dynamics, faradaic charge efficiency, and the active metal redox states of Ni-Fe oxide water splitting electrocatalysts[J]. J. Am. Chem. Soc., 2016, 138(17):5603-5614.
doi: 10.1021/jacs.6b00332 URL

[38] Görlin M, de Araújo J F, Schmies H, Bernsmeier D, Dresp S, Gliech M, Jusys Z, Chernev P, Kraehnert R, Dau H, Strasser P. Tracking catalyst redox states and reaction dynamics in Ni-Fe oxyhydroxide oxygen evolution reaction electrocatalysts: the role of catalyst support and electrolyte pH[J]. J. Am. Chem. Soc., 2017, 139(5):2070-2082.
doi: 10.1021/jacs.6b12250 URL

[39] Hunter B M, Thompson N B, Müller A M, Rossman G R, Hill M G, Winkler J R, Gray H B. Trapping an iron(VI) water-splitting intermediate in nonaqueous media[J]. Joule, 2018, 2(4):747-763.
doi: 10.1016/j.joule.2018.01.008 URL

[40] Ahn H S, Bard A J. Surface interrogation scanning electrochemical microscopy of Ni₁-_xFe_xOOH (0 < x < 0.27) ox-ygen evolving catalyst: Kinetics of the “fast” iron sites[J]. J. Am. Chem. Soc., 2016, 138(1):313-318.
doi: 10.1021/jacs.5b10977 URL

[41] Klaus S, Cai Y, Louie M W, Trotochaud L, Bell A T. Effects of Fe electrolyte impurities on Ni(OH)₂/NiOOH structure and oxygen evolution activity[J]. J. Phys. Chem. C, 2015, 119(13):7243-7254.
doi: 10.1021/acs.jpcc.5b00105 URL

[42] Zou S H, Burke M S, Kast M G, Fan J, Danilovic N, Bo-ettcher S W. Fe (oxy) hydroxide oxygen evolution reaction electrocatalysis: intrinsic activity and the roles of electrical conductivity, substrate, and dissolution[J]. Chem. Mater., 2015, 27(23):8011-8020.
doi: 10.1021/acs.chemmater.5b03404 URL

[43] Friebel D, Louie M W, Bajdich M, Sanwald K E, Cai Y, Wise A M, Cheng M J, Sokaras D, Weng T C, Alonso-Mori R, Davis R C, Bargar J R, Norskov J K, Nilsson A, Bell A T. Identification of highly active Fe sites in (Ni, Fe) OOH for electrocatalytic water splitting[J]. J. Am. Chem. Soc., 2015, 137(3):1305-1313.
doi: 10.1021/ja511559d pmid: 25562406

[44] Chen S C, Kang Z X, Zhang X D, Xie J F, Wang H, Shao W, Zheng X S, Yan W S, Pan B C, Xie Y. Highly active Fe sites in ultrathin pyrrhotite Fe₇S₈ nanosheets realizing efficient electrocatalytic oxygen evolution[J]. ACS Central Sci., 2017, 3(11):1221-1227.
doi: 10.1021/acscentsci.7b00424 URL

[45] Xiao H, Shin H, Goddard W A. Synergy between Fe and Ni in the optimal performance of (Ni,Fe)OOH catalysts for the oxygen evolution reaction[J]. Proc. Natl. Acad. Sci. U.S.A., 2018, 115(23):5872-5877.
doi: 10.1073/pnas.1722034115 URL

[46] Corrigan D A, Conell R S, Fierro C A, Scherson D A. In-situ Moessbauer study of redox processes in a composite hydroxide of iron and nickel[J]. J. Phys. Chem., 1987, 91(19):5009-5011.
doi: 10.1021/j100303a024 URL

[47] Chen J Y C, Dang L N, Liang H F, Bi W L, Gerken J B, Jin S, Alp E E, Stahl S S. Operando analysis of NiFe and Fe oxyhydroxide electrocatalysts for water oxidation: Detection of Fe⁴⁺ by Mössbauer spectroscopy[J]. J. Am. Chem. Soc., 2015, 137(48):15090-15093.
doi: 10.1021/jacs.5b10699 URL

[48] Tao H B, Xu Y H, Huang X, Chen J Z, Pei L J, Zhang J M, Chen J G G, Liu B. A general method to probe oxygen evolution intermediates at operating conditions[J]. Joule, 2019, 3(6):1498-1509.
doi: 10.1016/j.joule.2019.03.012 URL

[49] Su X Z, Wang Y, Zhou J, Gu S Q, Li J, Zhang S. Operando spectroscopic identification of active sites in NiFe prussian blue analogues as electrocatalysts: Activation of oxygen atoms for oxygen evolution reaction[J]. J. Am. Chem. Soc., 2018, 140(36):11286-11292.
doi: 10.1021/jacs.8b05294 URL

[50] Shinagawa T, Garcia-Esparza A T, Takanabe K. Insight on Tafel slopes from a microkinetic analysis of aqueous electrocatalysis for energy conversion[J]. Sci. Rep., 2015, 5:13801.
doi: 10.1038/srep13801 pmid: 26348156

[51] Deng Y L, Yeo B S. Characterization of electrocatalytic water splitting and CO₂ reduction reactions using in situ/operando Raman spectroscopy[J]. ACS Catal., 2017, 7(11):7873-7889.
doi: 10.1021/acscatal.7b02561 URL

[52] Timoshenko J, Cuenya B R. In situ/operando electrocatalyst characterization by X-ray absorption spectroscopy[J]. Chem. Rev., 2020, 121(2):882-961.
doi: 10.1021/acs.chemrev.0c00396 URL

[53] Li X N, Wang H Y, Yang H B, Cai W Z, Liu S, Liu B. In situ/operando characterization techniques to probe the electrochemical reactions for energy conversion[J]. Small Methods, 2018, 2(6):1700395.
doi: 10.1002/smtd.201700395 URL

[54] Zeng Y Q, Li X N, Wang J H, Sougrati M T, Huang Y Q, Zhang T, Liu B. In situ/operando Mössbauer spectroscopy for probing heterogeneous catalysis[J]. Chem. Catal., 2021, 1(6):1215-1233.

[55] Qiu Z, Tai C W, Niklasson G A, Edvinsson T. Direct observation of active catalyst surface phases and the effect of dynamic self-optimization in NiFe-layered double hydroxides for alkaline water splitting[J]. Energy Environ. Sci., 2019, 12(2):572-581.
doi: 10.1039/C8EE03282C URL

[56] Stoerzinger K A, Hong W T, Crumlin E J, Bluhm H, Shao-Horn Y. Insights into electrochemical reactions from ambient pressure photoelectron spectroscopy[J]. Accounts Chem. Res., 2015, 48(11):2976-2983.
doi: 10.1021/acs.accounts.5b00275 pmid: 26305627

[57] Ali-Löytty H, Louie M W, Singh M R, Li L, Casalongue H G S, Ogasawara H, Crumlin E J, Liu Z, Bell A T, Nilsson A, Friebel D. Ambient-pressure XPS study of a Ni-Fe electrocatalyst for the oxygen evolution reaction[J]. J. Phys. Chem. C, 2016, 120(4):2247-2253.
doi: 10.1021/acs.jpcc.5b10931 URL

[58] Li X N, Zhu K Y, Pang J F, Tian M, Liu J Y, Rykov A I, Zheng M Y, Wang X D, Zhu X F, Huang Y Q, Liu B, Wang J H, Yang W S, Zhang T. Unique role of Mössbauer spectroscopy in assessing structural features of heterogeneous catalysts[J]. Appl. Catal. B-Environ., 2018, 224:518-532.
doi: 10.1016/j.apcatb.2017.11.004 URL

[59] Mössbauer R L. Kernresonanzfluoreszenz von gammastr-ahlung in Ir191[J]. Zeitschrift für Physik, 1958, 151(2):124-143.
doi: 10.1007/BF01344210 URL

[60] Liu K, Rykov A I, Wang J H, Zhang T. Recent advances in the application of Mössbauer spectroscopy in heterogeneous catalysis[J]. Adv. Catal., 2015, 58:1-142.

[61] Kramm U I, Ni L M, Wagner S. ⁵⁷Fe Mössbauer spectroscopy characterization of electrocatalysts[J]. Adv. Ma-ter., 2019, 31(31):1805623.

[62] Fischer N, Claeys M. In situ characterization of Fischer-Tropsch catalysts: A review[J]. J. Phys. D-Appl. Phys., 2020, 53(29):293001.
doi: 10.1088/1361-6463/ab761c URL

[63] Gütlich P, Bill E, Trautwein A X. Mössbauer spectroscopy and transition metal chemistry: Fundamentals and applications[M]. Deutschland: Springer, 2010.

[64] Wang J H, Jin C Z, Liu X, Liu D R, Sun H, Wei F F, Zhang T, Stevens J G, Khasanov A, Khasanova I. Mössbauer spectroscopy database: Past, present, future[J]. Hyperfine Interact., 2012, 204(1-3):111-117.
doi: 10.1007/s10751-012-0564-0 URL

[65] Klencsár Z. MossWinn-methodological advances in the field of Mössbauer data analysis[J]. Hyperfine Interact., 2013, 217(1-3):117-126.
doi: 10.1007/s10751-012-0732-2 URL

[66] Kuang Z C, Liu S, Li X N, Wang M, Ren X Y, Ding J, Ge R L, Zhou W H, Rykov A I, Sougrati M T, Lippens P E, Huang Y Q, Wang J H. Topotactically constructed nickel-iron (oxy)hydroxide with abundant in-situ produced high-valent iron species for efficient water oxidation[J]. J. Energy Chem., 2021, 57:212-218.
doi: 10.1016/j.jechem.2020.09.014 URL

[67] Li X N, Ao Z M, Liu J Y, Sun H Q, Rykov A I, Wang J H. Topotactic transformation of metal-organic frameworks to graphene-encapsulated transition-metal nitrides as efficient Fenton-like catalysts[J]. ACS Nano, 2016, 10(12):11532-11540.
doi: 10.1021/acsnano.6b07522 URL

[68] Catala L, Mallah T. Nanoparticles of Prussian blue analogs and related coordination polymers: From information storage to biomedical applications[J]. Coord. Chem. Rev., 2017, 346:32-61.
doi: 10.1016/j.ccr.2017.04.005 URL

[69] Zakaria M B, Chikyow T. Recent advances in Prussian blue and Prussian blue analogues: Synjournal and thermal treatments[J]. Coord. Chem. Rev., 2017, 352:328-345.
doi: 10.1016/j.ccr.2017.09.014 URL

[70] Hu M, Belik A A, Imura M, Mibu K, Tsujimoto Y, Yamauchi Y. Synjournal of superparamagnetic nanoporous iron oxide particles with hollow interiors by using prussian blue coordination polymers[J]. Chem. Mater., 2012, 24(14):2698-2707.
doi: 10.1021/cm300615s URL

[71] Li X N, Wang Z H, Zhang B, Rykov A I, Ahmed M A, Wang J H. Fe_xCo₃-_xO₄ nanocages derived from nanoscale metal-organic frameworks for removal of bisphenol A by activation of peroxymonosulfate[J]. Appl. Catal. B-Environ., 2016, 181:788-799.
doi: 10.1016/j.apcatb.2015.08.050 URL

[72] Li X N, Cao C S, Hung S F, Lu Y R, Cai W Z, Rykov A I, Miao S, Xi S B, Yang H B, Hu Z H, Wang J H, Zhao J Y, Alp E E, Xu W, Chan T S, Chen H M, Xiong Q H, Xiao H, Huang Y Q, Li J, Zhang T, Liu B. Identification of the electronic and structural dynamics of catalytic centers in single-Fe-atom material[J]. Chem, 2020, 6(12):3440-3454.
doi: 10.1016/j.chempr.2020.10.027 URL

[73] Li X N, Zeng Y Q, Tung C W, Lu Y R, Baskaran S, Hung S F, Wang S F, Xu C Q, Wang J H, Chan T S, Chen H M, Jiang J C, Yu Q, Huang Y Q, Li J, Zhang T, Liu B. Unveiling the in situ generation of a monovalent Fe(I) site in the single-Fe-atom catalyst for electrochemical CO₂ reduction[J]. ACS Catal., 2021, 11(12):7292-7301.
doi: 10.1021/acscatal.1c01621 URL

[74] Li J K, Sougrati M T, Zitolo A, Ablett J M, Oĝuz I C, Mineva T, Matanovic I, Atanassov P, Huang Y, Zenyuk I, Di Cicco A, Kumar K, Dubau L, Maillard F, Dražic G, Jaouen F. Identification of durable and non-durable FeN_x sites in Fe-N-C materials for proton exchange membrane fuel cells[J]. Nature. Catal., 2020, 4(1):10-19.

[75] Zhu K Y, Zhu X F, Yang W S. Application of in-situ techniques for the characterization of NiFe-based oxygen evolution reaction (OER) electrocatalysts[J]. Angew. Chem. Int. Ed., 2019, 58(5):1252-1265.
doi: 10.1002/anie.201802923 URL

[76] Gao M R, Sheng W C, Zhuang Z B, Fang Q R, Gu S, Jiang J, Yan Y S. Efficient water oxidation using nanostructured α-nickel-hydroxide as an electrocatalyst[J]. J. Am. Chem. Soc., 2014, 136(19):7077-7084.
doi: 10.1021/ja502128j URL