Accelerate oxygen evolution reaction by adding chemical mediator and utilizing solar energy
Accelerate oxygen evolution reaction by adding chemical mediator and utilizing solar energy
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DOI：
10.1016/j.ijhydene.2022.11.294
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发表时间：
2022-12
影响因子：
7.2
通讯作者：
R. He;Q. Sun;Pitchai Thangasamy;Xinqing Chen;Yizhi Zhang;Haiyan Wang;Hongmei Luo;Xiaoping Zhou-Xiaopi
中科院分区：
文献类型：
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作者：
R. He;Q. Sun;Pitchai Thangasamy;Xinqing Chen;Yizhi Zhang;Haiyan Wang;Hongmei Luo;Xiaoping Zhou-Xiaopi
由于析氧反应（OER）是一个复杂的氧化过程，其反应动力学的滞后性严重制约了电化学分解水制氢的发展。在这项工作中，直接生长在镍泡沫上的硫化钴纳米片（Co-S/Ni3S2@NF）表现出出色的OER性能，其电势为1.57 V（vs. RHE），以实现20 mA cm−2的电流密度，与贵金属基催化剂IrO2@NF的性能相比是有利的。通过添加0.1 M甘油，可以在1.35 V（vs. RHE）的极低电位下达到相同的电流密度（20 mA cm-2），表明添加化学介体是通过化学介体的相应氧化来替代缓慢的OER的可能途径。甘油氧化反应的活化能（戈尔）和OER（21.9 kJ/mol和28.2 kJ/mol）的比较进一步证实了这一结论。太阳能可以被捕获并用于提高电化学水分解的OER。在1.6V（vs. RHE）下，甘油的加入和温度的升高可使阳极电流密度提高10倍。本工作为加速OER制氢提供了解决方案。
The electrochemical water splitting to produce clean hydrogen is severely restricted by oxygen evolution reaction (OER) due to the sluggish kinetics of its complicated oxidation process. In this work, the cobalt sulfide nanosheets directly grown on nickel foam (Co–S/Ni3S2@NF) demonstrated an outstanding OER performance with a potential of 1.57 V (vs. RHE) to achieve a current density of 20 mA cm−2, favorably comparing the performance of the noble metal-based catalyst IrO2@NF. The same current density (20 mA cm−2) could be reached at an extremely low potential of 1.35 V (vs. RHE) by adding 0.1 M glycerol, indicating adding chemical mediator is a possible approach to replace the sluggish OER by the corresponding oxidation of chemical mediator. The activation energy comparison of glycerol oxidation reaction (GOR) and OER (21.9 kJ/mol and 28.2 kJ/mol) further proved this conclusion. The solar energy can be captured and utilized to improve OER in the electrochemical water splitting. The anodic current density at ∼1.6 V (vs. RHE) can be increased 10 times by adding glycerol and raising temperature. This work provides solutions to accelerate OER for H2production.