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5 years ago

In Situ Derived CoB Nanoarray: A High-Efficiency and Durable 3D Bifunctional Electrocatalyst for Overall Alkaline Water Splitting

In Situ Derived CoB Nanoarray: A High-Efficiency and Durable 3D Bifunctional Electrocatalyst for Overall Alkaline Water Splitting
Yongjun Ma, Shuai Hao, Danni Liu, Xuping Sun, Gu Du, Fengli Qu, Tingting Liu, Chun Tang, Abdullah M. Asiri, Wenbo Lu, Lisi Xie
The development of efficient bifunctional catalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is of extreme importance for future renewable energy systems. This Communication reports the recent finding that room-temperature treatment of CoO nanowire array on Ti mesh by NaBH4 in alkaline media leads to in situ development of CoB nanoparticles on nanowire surface. The resulting self-supported CoB@CoO nanoarray behaves as a 3D bifunctional electrocatalyst with high activity and durability for both HER (<17% current density degradation after 20 h electrolysis) and OER (<14% current density degradation after 20 h electrolysis) with the need of the overpotentials of 102 and 290 mV to drive 50 mA cm−2 in 1.0 m KOH, respectively. Moreover, its two-electrode alkaline water electrolyzer also shows remarkably high durability and only demands a cell voltage of 1.67 V to deliver 50 mA cm−2 water-splitting current with a current density retention of 81% after 20 h electrolysis. This work provides a promising methodology for the designing and fabricating of metal-boride based nanoarray as a high-active water-splitting catalyst electrode for applications. Room-temperature treatment of CoO nanowire array on Ti mesh by NaBH4 in alkaline media leads to in situ surface development of CoB nanoparticles. Such CoB@CoO core–shell nanoarray is stable and efficient for water splitting with the need of 1.67 V to deliver 50 mA cm−2 in 1.0 m KOH.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201700805

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