Abstract
The oxidation processes of adsorbed CO (COad) and solution phase CO (COsol) on Pt(110) electrode were investigated by cyclic voltammetry and in-situ FTIR spectroscopy. It has revealed that in comparison with COad on Pt(110) in a CO-free solution,the oxidation current peak of COsol in a CO-saturated solution is positively shifted ca. 168 mV,and the peak current density has been increased by 6. 70 times. Linear adsorbed CO (COL) is determined by in-situ FTIR spectroscopy as the main species,which is uniformly distributed on Pt (110) surface. In a CO-free solution,the onset potential of COL is measured by in-situ FTIRS ca. 0. 15 V; the COL band is blue-shifted with the increase of electrode potential in the potential range where COL is stable,yielding a Stark tuning rate 30 cm -1·V -1; when the COL is oxidized at E > 0. 15 V,the COL band is red-shifted at a rate of - 56 cm -1·V -1. In the case of CO-saturated solution,the CO2 band could be appeared in the in-situ FTIR spectrum recorded at - 0. 05 V,demonstrating that the onset potential of COL oxidation is negatively shifted ca. 200 mV in comparison with Pt( 110) in a CO-free solution; the COL band is immediately red-shifted with a rate of - 26. 5 cm -1·V -1 when the potential is above - 0. 05 V.
Keywords
Pt(110), CO, in situ FTIR spectroscopy
Publication Date
2010-08-28
Online Available Date
2010-08-28
Revised Date
2010-08-28
Received Date
2010-08-28
Recommended Citation
Li TIAN, Jun-tao LI, Jin-yu YE, Chun-hua ZHEN, Shi-gang SUN.
Studies of oxidation Processes of Adsorbed and Solution CO on Pt(110) Electrode by Cyclic Voltammetry and in situ FTIRS[J]. Journal of Electrochemistry,
2010
,
16(3): Article 10.
DOI: 10.61558/2993-074X.3356
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol16/iss3/10
References
[1]Sun S G.Studying electrocatalytic oxidation of small or-ganic molecules of small organic molecules with in-situ infrared spectroscopy[M].Chapter6in Electrocatalys-is,Vol.4of Frontiers in Electrochemistry,Lipkowski J,Ross P N(Eds.),New York:Wiley-VCH Inc,1998.243-900.
[2]Mayrhofer K J J,Arenz M,Blizanac B B,et al.In CO surface electrochemistry on Pt-nanoparticles:A selective review[J].Electrochim Acta,2005,50:5144-5154.
[3]Beden B,Lamy C,Tacconi N R D,et al.The electrooxi-dation of CO:a test reaction in electrocatalysis[J].Electrochim Acta,1990,35(4):691-704.
[4]Leger J M,Beden B,Lamy C.Carbon monoxide electro-sorption on low index platinum single crystal electrodes[J].J Electroanal Chem,1984,170:305-317.
[5]Palaikis L,Zurawski K,Hourani M,et al.Surface elec-trochemistry of carbon monoxide adsorbed from electro-lytic solutions at single crystal surfaces of Pt(111)and Pt(100)[J].Surf Sci,1988,199:183-198.
[6]Leung L W H,Wieckowski A,Weaver M J.In Situ infra-red Spectroscopy of well-defined single-crystal elec-trodes:adsorption and electrooxidation of CO on Pt(111)[J].J Phys Chem,1988,92:6985-6990.
[7]Lopez C A,Cuesta A,Gutierrez C.Potential dependence of the saturation CO coverage of Pt electrodes:The origin of the pre-peak in CO-stripping voltammograms.Part1:Pt(111)[J].J Electroanal Chem,2005,579:1-12.
[8]García G,Koper M T M.Dual Reactivity of step-bound carbon monoxide during oxidation on a stepped platinum electrode in alkaline media[J].J Am Chem Soc,2009,131(15):5384-5385.
[9]Chang C S,Leung L W H,Weaver M J.Comparisons be-tween coverage-dependent infrared frequencies for car-bon monoxide adsorbed on ordered Pt(111),Pt(100),and Pt(110)in Electrochemical and ultrahigh-vacuum environments[J].J Phys Chem,1989,93:5341-5345.
[10]Rodes A,Gomez R,Feliu J M,et al.Sensitivity of com-pressed carbon monoxide adlayers on platinum(111)electrodes to long-range substrate structure:Influence-of monoatomic steps[J].Langmuir,2000,16(2):811-816.
[11]Angelucci C A,Herrero E,Feliu J M.Bulk CO oxi-dation on Platinum electrodes vicinal to the Pt(111)surface[J].J Solid State Electrochem,2007,11:1531-1539.
[12]Batista E A,Iwasita T,Vielstich W.Mechanism of sta-tionary bulk CO oxidation on Pt(111)electrodes[J].J Phys Chem C,2004,108(38):14216-14222.
[13]Fromondi I,Scherson D A.Oxidation of adsorbed CO on Pt(111)in CO-saturated perchloric acid aqueous solu-tions:Simultaneous in situ time-resolved reflectance spectroscopy and second harmonic generation studies[J].J Phys Chem B,2006,110(42):20749-20751.
[14]Hanawa H,Kunimatsu K,Uchida H,et al.In situ ATR-FTIR study of bulk CO oxidation on a polycrystalline Pt electrode[J].Electrochim Acta,2009,54(26):6276-6285.
[15]Sun S G(孙世刚),Fan Y J(樊友军).金属单晶表面电化学与电催化,in固体表面物理化学若干研究前沿[M].万惠霖等著,Xiamen:Xiamen University Press,2006.175-226.
[16]Zhou Z Y,Sun S G.In situ step-scan time-resolved mi-croscope FTIR spectroscopy applied in irreversible electrochemical reactions[J].Electrochim Acta,2005,50:5163-5171.
[17]Lin W F,Sun S G.In situ FTIRS investigations of sur-face processes of Rh electrode-novel observation of geminal adsorbates of carbon monoxide on Rh electrode in acid solution[J].Electrochim Acta,1996,41(6):803-809.
[18]Clavilier J,Armand D,Sun S G,et al.Electrochemical adsorption behaviour of platinum stepped surfaces in sulphuric acid solutions[J].J Electroanal Chem,1986,205(1/2):267-277.
[19]Lebedeva N P,Koper M T M,Feliu J M,et al.Mecha-nism and kinetics of the electrochemical CO adlayer oxidation on Pt(111)[J].J Electroanal Chem,2002,524:242-251.
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