期刊
ELECTROCHIMICA ACTA
卷 119, 期 -, 页码 64-71出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.11.138
关键词
Cobaltosic oxide; Water oxidation catalyst; neutral electrolyte; Mass transfer; Buffering agents
资金
- National Natural Science Foundation of China [11135008, 11105151, 11305174, U1332111, 11079004]
- Science Fund for Creative Research Groups of NSFC [11321503]
- National Basic Research Program of China [2012CB825800]
- Fundamental Research Funds for the Central Universities [WK2310000023, WK2310000030]
Enhancing catalytic water-splitting activity under mild environments is significant to solve the long-standing cost, safety and stability issues in photoelectrochemical cells. Here, we demonstrate the crucial role of improving surface H transfer in achieving efficient water-splitting catalytic activity of Co3O4 nanowire arrays in near-neutral pH working electrolytes. Under weak OH circumstances, the impedance of mass transfer quickly multiplies and the catalytic current declines to a current plateau in the region of 1.7-2.1 V vs. RHE, due to the surface H concentration approaching a threshold value in the range of 10(-3)-10(-4) M. The proper choice of buffering agents to facilitate the mass transfer, with 0.1 M KPi as a prototype, would decrease the overpotential by 500 mV for neutral electrolyte and favors to achieve a catalytic current comparable to that under strong alkali environments (pH > 13). These results also provide a solid guideline for extending the electrocatalytic utility of other transition metal catalysts to near-neutral pH environments. (C) 2013 Elsevier Ltd. All rights reserved.
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