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论文类型：期刊论文

发表时间：2017-08-01

发表刊物：Nano Energy

收录刊物：Scopus、EI

卷号：38

页面范围：175-184

ISSN号：22112855

摘要：On the way to energy-efficient and cost-effective hydrogen production by electrochemical or photoelectrochemical water splitting, it is of primary importance to develop highly active and durable water oxidation electrocatalysts based on earth-abundant elements. Here we report a highly active, robust, cheap, and facilely fabricated O2-evolving catalyst on a Cu foil, NiB0.45-250/Cu, which forms a NiB0.45/NiOxcore-shell heterostructured nanoparticulate film during anodic electrolysis. The performance of NiB0.45-250/Cu, to produce 10?mA?cm?2at 296?mV overpotential in 1?M KOH over 60?h, is at par with the best efficiency of earth-abundant electrocatalysts reported to date and surpasses that of IrO2-loaded copper electrode under identical conditions. Experimental evidence and theoretical calculations reveal the correlations of B/Ni atomic ratio and annealing temperature with the morphology, surface microtexture, electrochemical active surface area, and electrical conductivity of NiBxfilms. Optimal combination of these factors can evidently enhance the catalytic activity of nickel boride electrocatalysts. ? 2017 Elsevier Ltd