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Published on: October 12, 2019
An efficient ternary CoP2xSe2(1-x) nanowire array for overall water splitting
Kaili Liu1, Fengmei Wang2, Tofik Ahmed Shifa2
1CAS Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology, Beijing 100190, China. hej@nanoctr.cn and University of Chinese Academy of Science, No. 19A Yuquan Road, Beijing 100049, China and Sino-Danish Center for Education and Research, Beijing, 100190, China.
Abstract:
Developing earth-abundant and efficient bifunctional electrocatalysts for realizing the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) under alkaline conditions is an intriguing challenge. Here, ternary necklace-like CoP2xSe2(1-x) nanowire arrays are synthesized via simultaneously phosphorizing and selenizing Co(OH)2 nanowires. Owing to the substitution of the P atom in the ternary system, the optimal electronic structure of CoP2xSe2(1-x) can be obtained and the stability can also be enhanced for hydrogen evolution. Thus, the ternary CoP2xSe2(1-x) NWs are highly active for electrochemical hydrogen evolution in both acidic and alkaline media, achieving a current density of 10 mA cm -2 at overpotentials of 70 mV and 98 mV, respectively. To realize the overall water splitting, we further performed the experiment using the CoP2xSe2(1-x) NWs as a cathode and Co(OH)2 NWs as an anode, which requires a cell voltage of 1.65 V to afford a water splitting current density of 10 mA cm -2 in strong alkaline media (1.0 M KOH).
