ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces
5 years ago

Amorphous Co2B Grown on CoSe2 Nanosheets as a Hybrid Catalyst for Efficient Overall Water Splitting in Alkaline Medium

Amorphous Co2B Grown on CoSe2 Nanosheets as a Hybrid Catalyst for Efficient Overall Water Splitting in Alkaline Medium
Yaxiao Guo, Erkang Wang, Changshuai Shang, Zhaoyang Yao
In this work, we synthesized a novel hybrid catalyst (Co2B/CoSe2) by growing amorphous Co2B on the surface of CoSe2 nanosheets. Benefiting from the prominent coupled effects between Co2B and CoSe2 nanosheets, an efficient oxygen evolution reaction catalyst Co2B/CoSe2 exhibits a very low overpotential of 320 mV @ 10 mA cm–2 with a Tafel slope of 56.0 mV dec–1 in alkaline medium. An overpotential of 300 mV can also be achieved by Co2B/CoSe2 at the same condition for hydrogen evolution reaction. Notably, at the applied potential of 1.73 V, the electrocatalyst Co2B/CoSe2 demonstrates a current density of 10 mA cm–2 for overall water splitting and displays an outstanding long-term stability. The faradaic efficiencies of Co2B/CoSe2 for both hydrogen and oxygen evolution are close to 100%.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b10605

DOI: 10.1021/acsami.7b10605

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