Anion-exchange synthesis of a nanoporous crystalline CoB2O4 nanowire array for high-performance water oxidation electrocatalysis in borate solution

作者：Zhu, Guilei; Yang, Lin; Zhang, Rong; Qu, Fengli; Liu, Zhiang; Du, Gu; Asiri, Abdullah M.; Yao, Yadong^*; Sun, Xuping^*

来源：Nanoscale, 2017, 9(34): 12343-12347.

DOI：10.1039/c7nr04344a

• OXYGEN-EVOLVING CATALYST
• INTERCONNECTED NETWORK
• GENERATING HYDROGEN
• SURFACE DERIVATION
• EFFICIENT
• EVOLUTION
• NANOSHEETS
• NANOARRAY
• ELECTRODE
• FILM

Developing nanoporous nanoarray electrocatalysts for efficient water oxidation in environmentally benign media is highly desired but still remains a key challenge. In this communication, we report the fabrication of a nanoporous crystalline CoB2O4 nanowire array on Ti mesh (CoB2O4/TM) from a Co(OH)F nanowire array on Ti mesh (Co(OH)F/TM) via an anion-exchange reaction. As a three dimensional (3D) catalyst electrode for water oxidation, CoB2O4/TM exhibits superior catalytic activity and needs an overpotential of only 446 mV to drive a geometrical catalytic current density of 10 mA cm(-2) in 0.1 M potassium borate (pH = 9.2). Notably, this catalyst also shows strong long-term electrochemical durability with high turnover frequency values of 0.19 and 0.81 mol O-2 per s at overpotentials of 400 and 500 mV, respectively.

• 出版日期2017-9-14
• 单位成都地质矿产研究所; 曲阜师范大学; 四川大学