Replacing oxygen evolution with sodium sulfide electro-oxidation toward energy-efficient electrochemical hydrogen production: Using cobalt phosphide nanoarray as a bifunctional catalyst

被引：19
作者：
Hao, Shuai [1 ,2 ]
Yang, Libin [2 ]
Liu, Danni [2 ]
Du, Gu [3 ]
Yang, Yingchun [1 ]
Asiri, Abdullah M. [4 ]
Sun, Xuping [2 ]
机构：
[1] Chengdu Univ Informat Technol, Coll Resources & Environm, Chengdu 610225, Sichuan, Peoples R China
[2] Sichuan Univ, Coll Chem, Chengdu 610064, Sichuan, Peoples R China
[3] Chengdu Inst Geol & Mineral Resources, Chengdu 610081, Sichuan, Peoples R China
[4] King Abdulaziz Univ, Fac Sci, Chem Dept, Jeddah 21589, Saudi Arabia
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2017年 / 42卷 / 42期
关键词：
Cobalt phosphide nanoarray; Sodium sulfide electro-oxidation; Hydrogen production; Bifunctional catalyst; ALKALINE NABH4 SOLUTION; COP NANOSHEET ARRAYS; NANOWIRE ARRAYS; GENERATING HYDROGEN; CARBON NANOTUBES; WATER; ELECTROCATALYST; NANOPARTICLES; CATHODE; ELECTRODES;
D O I：
10.1016/j.ijhydene.2017.05.217
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Water splitting is an important process to produce hydrogen fuels and oxygen evolution reaction (OER), the anodic half reaction, is identified as the bottleneck for its kinetic and energetic complexity in improving the overall efficiency. In this communication, we report that cobalt phosphide nanoarray in situ grown on Ti mesh (CoP NA/TM) behaves as a durable robust non-noble-metal electrocatalyst for sodium sulfide (Na2S) oxidation with the need of potential of 1.31 V to drive 20 mA cm(-2) in 1.0 M KOH with 50 mM Na2S. The high hydrogen-evolving activity for CoP NA/TM enables it as a bifunctional catalyst electrode for energy-efficient electrochemical hydrogen generation by replacing OER with Na2S oxidation reaction. The CoP NA/TMIICoP NA/TM couple needs a cell voltage of 1.49 V to drive 15 mA cm 2, 210 mV less than of pure water splitting, with strong long-term electrochemical durability and 100% Faradic efficiency for hydrogen evolution. (C) 2017 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
引用
收藏
页码：26289 / 26295
页数：7
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