Abstract
Water electrolysis is of great importance for high-efficient hydrogen production. Replacing noble metal-based electrocatalysts by highly efficient and inexpensive non-noble metal based catalysts is critical for the practical application of these technologies. Here we report a novel hybrid of nitrogen-doped carbon shell coated CoP nanocrystals encapsulated in porous nitrogen-doped carbon substrate (CoP/PNC), which is synthesized through sol-gel and consequent pyrolysis-oxidation-phosphorization method. The obtained CoP/PNC exhibits promising electrocatalytic performance toward HER and OER due to the synergistic effect between N-doped carbon and CoP nanocrystals. When the CoP/PNC catalyst is applied in a two-electrode water splitting device, the cell potential at 10 mA cm−2 could be as low as 1.68 V. Besides, it still remains current retention of 78.7% after continuous run for 24 h.
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