Journal
ELECTROCHIMICA ACTA
Volume 259, Issue -, Pages 962-967Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.11.028
Keywords
Oxygen vacancy; Cobalt oxide; Phosphorus doping; Oxygen evolution reaction
Categories
Funding
- National Natural Science Foundation of China [21522602, 51672082, 91534202]
- Social Development Program of Shanghai [17DZ1200900]
- Program for Shanghai Youth Top-notch Talent
- Fundamental Research Funds for the Central Universities [222201718002]
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Uniformly and controllably introducing oxygen vacancy (Ov) into spinel electrocatalysts is still a great challenge for the oxygen evolution reaction (OER). Herein, we demonstrate the synthesis of spinel Co3O4 mesoporous nanosheets aggregation with tunable Ov by a simple phosphorus (P) doping strategy. It is found that a trade-off between Ov and electronic conductivity plays an important role in improving OER electrocatalytic activity. The optimized Co3O4-xP0.15 electrocatalyst delivers a current density of 20 mA cm(-2) in alkaline media within a small overpotential of only 338 mV, which is much lower than the corresponding Co3O4 (395 mV) and the commercial RuO2 (368 mV) catalysts. The Tafel slope is 52 mV dec(-1) and the overpotential gives negligible increase even through 8 h OER at 10 mA cm(-2). The superior OER catalytic activity is mainly attributed to the 2D mesoporous nanosheets (rich active sites) and appropriate Ov (fast electrons transfer). This work provides a simple and effective strategy to control Ov concentration in spinel electrocatalysts for enhancing water oxidation capability. (C) 2017 Elsevier Ltd. All rights reserved.
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