Dopant triggered atomic configuration activates water splitting to hydrogen

Finding highly efficient hydrogen evolution reaction (HER) catalysts is pertinent to the ultimate goal of transformation into a net-zero carbon emission society. The design principles for such HER catalysts lie in the well-known structure-property relationship, which guides the synthesis procedure that creates catalyst with target properties such as catalytic activity. Here we report a general strategy to synthesize 10 kinds of single-atom-doped CoSe2-DETA (DETA=diethylenetriamine) nanobelts. By systematically analyzing these products, we demonstrate a volcano-shape correlation between HER activity and Co atomic configuration (ratio of Co-N bonds to Co-Se bonds). Specifically, Pb-CoSe2-DETA catalyst reaches current density of 10mAcm(-2) at 74mV in acidic electrolyte (0.5M H2SO4, pH similar to 0.35). This striking catalytic performance can be attributed to its optimized Co atomic configuration induced by single-atom doping.

Automated summary

Finding highly efficient hydrogen evolution reaction (HER) catalysts is crucial for achieving a net-zero carbon emission society. In this study, we synthesized 10 kinds of single-atom-doped CoSe2-DETA nanobelts and discovered a correlation between HER activity and Co atomic configuration. Specifically, the Pb-CoSe2-DETA catalyst exhibited remarkable catalytic performance in acidic electrolyte, which can be attributed to its optimized Co atomic configuration induced by single-atom doping.