Co 3 O 4 /Fe 0.33 Co 0.66 P Interface Nanowire for Enhancing Water Oxidation Catalysis at High Current Density

• Published in: Advanced materials (Weinheim) 2018-11, Vol.30 (45), p.e1803551
• Main Authors: Zhang, Xiaoyan, Li, Jing, Yang, Yong, Zhang, Shan, Zhu, Haishuang, Zhu, Xiaoqing, Xing, Huanhuan, Zhang, Yelong, Huang, Bolong, Guo, Shaojun, Wang, Erkang
• Format: Article
• Language: English
• ISSN: 0935-9648; 1521-4095
• DOI: 10.1002/adma.201803551

Designing well-defined nanointerfaces is of prime importance to enhance the activity of nanoelectrocatalysts for different catalytic reactions. However, studies on non-noble-metal-interface electrocatalysts with extremely high activity and superior stability at high current density still remains a great challenge. Herein, a class of Co O /Fe Co P interface nanowires is rationally designed for boosting oxygen evolution reaction (OER) catalysis at high current density by partial chemical etching of Co(CO ) (OH)·0.11H O (Co-CHH) nanowires with Fe(CN) , followed by low-temperature phosphorization treatment. The resulting Co O /Fe Co P interface nanowires exhibit very high OER catalytic performance with an overpotential of only 215 mV at a current density of 50 mA cm and a Tafel slope of 59.8 mV dec in 1.0 m KOH. In particular, Co O /Fe Co P exhibits an obvious advantage in enhancing oxygen evolution at high current density by showing an overpotential of merely 291 mV at 800 mA cm , much lower than that of RuO (446 mV). Co O /Fe Co P is remarkably stable for the OER with negligible current loss under overpotentials of 200 and 240 mV for 150 h. Theoretical calculations reveal that Co O /Fe Co P is more favorable for the OER since the electrochemical catalytic oxygen evolution barrier is optimally lowered by the active Co- and O-sites from the Co O /Fe Co P interface.