二维NiFe-LDH/Mo(OS)x纳米片协同促进电催化析氧反应

过渡族金属基二维纳米材料作为电催化析氧反应（oxygen evolution reaction, OER）催化剂具有巨大的潜力。通过原位电沉积法，在泡沫镍基底表面制备了二维层状镍铁双氢氧化物（NiFe-LDH）和氧硫化钼Mo(OS)_x纳米片异质结构。NiFe LDH/Mo(OS)_x电极在1 M KOH溶液中表现出优异的OER性能和长效稳定性，在10 mA/cm²电流密度下过电势仅为220 mV。在100、500 mA/cm²的高电流密度下，也能达到253、304 mV的低过电势。研究结果表明，NiFe-LDH/Mo(OS)_x电极优异的OER性能归因于Mo(OS)_x和NiFe LDH的协同作用，极大地促进了Fe²⁺向Fe³⁺活性物质的转化，并促进了氧空位的形成。这种协同制备方法为合理构建和设计异质结构电催化剂，实现高效的水分解提供了帮助。

Two-dimensional NiFe-LDH/Mo(OS)x nanosheets heterostructure for synergetic promotion of oxygen-evolving electrocatalysis

Transition metal-based two-dimensional nanosheet materials have great potential as electrocatalytic oxygen evolution reaction (OER) catalysts. Two dimensional layered nickel iron double hydroxide (NiFe-LDH) and molybdenum oxysulfide Mo(OS)_x nanosheet heterostructures were prepared on the surface of foam nickel substrate by in-situ electrodeposition. NiFe-LDH/Mo(OS)_x electrode showed excellent OER performance and long-term stability in 1 M KOH solution, and the overpotential was only 220 mV at a current density of 10 mA/cm². At high current densities of 100, 500 mA/cm², low overpotential of 253, 304 mV could also be achieved. The results demonstrate that the extraordinary OER performance of NiFe-LDH/Mo(OS)_x electrodes can be attributed to the synergistic effect of Mo(OS)_x and NiFe-LDH, which greatly promotes the conversion of Fe²⁺ to Fe³⁺ active species and enhances the formation of oxygen vacancies. The collaborative preparation method provides help for the rational construction and design of heterogeneous electrocatalysts to achieve efficient water decomposition.