Preparations of Nickel-Iron Hydroxide/Sulfide and Their Electrocatalytic Performances for Overall Water Splitting

Authors

Hang-shuo LU, 1. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
Xiao-bo HE, 2. Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China;3. Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology, Changzhou 213164, Jiangsu, China;
Feng-xiang YIN, 1. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;2. Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China;3. Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology, Changzhou 213164, Jiangsu, China;Follow
Guo-ru LI, 2. Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China;

Corresponding Author

Feng-xiang YIN(yinfx@cczu.edu.cn)

Abstract

The Ni-Fe/Ti oxygen evolution electrode was prepared by electrodeposition on a titanium mesh substrate. Then, the as prepared Ni-Fe/Ti electrode was used to derive the Ni-Fe-S/Ti hydrogen evolution electrode through solid phase sulfuration. The effects of the molar ratio of Ni²⁺ to Fe³⁺ in the electrolyte and the amount of thiourea on the structures and electrochemical performances of Ni-Fe/Ti and Ni-Fe-S/Ti electrodes were investigated. The results show that the oxygen evolution performance of Ni-Fe/Ti electrode was first increased and then decreased with the increase of nickel ion content in the electrolyte. The Ni9Fe1/Ti electrode exhibited the best oxygen evolution performance. With the increase of thiourea addition, the hydrogen evolution performance of Ni-Fe-S/Ti electrode was increased firstly and then decreased. The Ni9Fe1S0.25/Ti electrode showed the best hydrogen evolution performance. To achieve a current density of 50 mA·cm^-2, an overpotential of 280 mV was required for oxygen evolution reaction (OER) with the Ni9Fe1/Ti electrode, while 269 mV for hydrogen evolution reaction (HER) with the Ni9Fe1S0.25/Ti electrode, both with good stabilities. Accordingly, the Ni9Fe1/Ti and Ni9Fe1S0.25/Ti electrode were used as anodes and cathodes, respectively, for overall water splitting tests. The current density of 50 mA·cm^-2 was achieved at a voltage of 1.69 V, showing the good catalytic performance of overall water splitting.

Graphical Abstract

Keywords

nickel-iron hydroxide, nickel-iron sulfide, oxygen evolution reaction, hydrogen evolution reaction, overall water splitting

DOI Link

https://doi.org/10.13208/j.electrochem.190114

Publication Date

2020-02-28

Online Available Date

2019-04-02

Revised Date

2019-04-01

Received Date

2019-01-14

Recommended Citation

Hang-shuo LU, Xiao-bo HE, Feng-xiang YIN, Guo-ru LI. Preparations of Nickel-Iron Hydroxide/Sulfide and Their Electrocatalytic Performances for Overall Water Splitting[J]. Journal of Electrochemistry, 2020 , 26(1): 136-147.
DOI: 10.13208/j.electrochem.190114
Available at: https://jelectrochem.xmu.edu.cn/journal/vol26/iss1/5