Abstract
Hydrogen production is the key to the development and utilization of hydrogen energy. In this paper, we find a new phenomenon in which abundant and uniform bubbles evolve and quickly release during water splitting on the surface of a nickel-based honeycomb electrode with microtapered holes (NHEMH). Benefiting from the unique microtapered hole honeycomb structure, the solution circulation on the surface of NHEMH is accelerated, thus generating a dynamically stabilized reactive interface and improving the ionic/mass exchange. Meanwhile, the unique honeycomb skeleton has good hydrophilicity and aerophobic properties. Furthermore, NHEMH with a large surface area, rich multi-vacancies, and highly conductive nickel metal exhibits an outstanding electrocatalytic ability. P-doped NHEMH (PNHEMH) with the Ni2P/NiO heterointerface decorated by multivacancies, when used as an electrolyzer for overall water splitting, requires only 1.52 V to produce a current density of 10 mA/cm2, which is much better than the performance of benchmark Pt/C//IrO2 electrodes.
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