期刊
JOURNAL OF POWER SOURCES
卷 389, 期 -, 页码 160-168出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.04.023
关键词
Electrolysis; Nanocone array; Ni(Fe) (oxy)hydroxide; Oxygen evolution reaction; Stainless steel mesh; Water oxidation
资金
- National Natural Science Foundation of China [21673028, 21373040]
- Basic Research Program of China [2014CB239402]
The development of highly efficient, robust, and cheap water oxidation electrodes is a major challenge in constructing industrially applicable electrolyzers for large-scale production of hydrogen from water. Herein we report a hierarchical stainless steel mesh electrode which features Ni(Fe)OxHy-coated self-supported nanocone arrays. Through a facile, mild, low-cost and readily scalable two-step fabrication procedure, the electrochemically active area of the optimized electrode is enlarged by a factor of 3.1 and the specific activity is enhanced by a factor of 250 at 265 mV overpotential compared with that of a corresponding pristine stainless steel mesh electrode. Moreover, the charge-transfer resistance is reduced from 4.47 Omega for the stainless steel mesh electrode to 0.13 Omega for the Ni(Fe)OxHy-coated nanocone array stainless steel mesh electrode. As a result, the cheap and easily fabricated electrode displays 280 and 303 mV low overpotentials to achieve high current densities of 500 and 1000 mA cm(geo)(-2), respectively, for oxygen evolution reaction in 1 M KOH. More importantly, the electrode exhibits a good stability over 340 h of chronopotentiometric test at 50 mA cm(geo)(-2) and only a slight attenuation (4.2%, similar to 15 mV) in catalytic activity over 82 h electrolysis at a constant current density of 500 mA cm(geo)(-2).
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