An amorphous Co-carbonate-hydroxide nanowire array for efficient and durable oxygen evolution reaction in carbonate electrolytes

• Published in: Nanoscale Vol. 9; no. 43; pp. 16612 - 16615
• Main Authors: Xie, Maowen, Yang, Lin, Ji, Yuyao, Wang, Ziqiang, Ren, Xiang, Liu, Zhiang, Asiri, Abdullah M, Xiong, Xiaoli, Sun, Xuping
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 01.01.2017
• Subjects: Catalysis; Catalysts; Catalytic activity; Cobalt; Metal foams; Nanowires; Oxygen evolution reactions
• ISSN: 2040-3364; 2040-3372
• DOI: 10.1039/c7nr07269d

The development of earth-abundant catalysts toward high-efficient and durable oxygen evolution reaction (OER) electrocatalysis in the carbonate electrolyte is in great demand but remains a huge challenge. In this communication, we describe the development of a Co-carbonate-hydroxide nanowire array on nickel foam (CoCH/NF) via in situ electrochemical conversion of the Co(CO ) (OH)·0.11H O nanowire array. When utilized as a 3D catalyst electrode for the OER in 1.0 M KHCO (pH: 8.3), as-formed CoCH/NF demands overpotential of only 332 mV to drive a geometrical catalytic current density of 10 mA cm , with its catalytic activity being maintained for at least 130 h. Impressively, it also demonstrates a high turnover frequency value of 0.22 mol O s at an overpotential of 500 mV.