二维NiFe-LDH/Mo(OS)_(x)纳米片协同促进电催化析氧反应

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

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(NiFeLDH)和氧硫化钼 Mo(OS)纳米片异质结构。NiFe LDH/Mo(OS)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/cm^(2)电流密度下过电势仅为 220 mV。在 100、500 mA/cm^(2)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,NiFeLDH/Mo(OS)电极优异的 OER 性能归因于 Mo(OS)和 NiFe LDH 的协同作用,极大地促进了Fe向 Fe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。

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)nanosheet heterostructures were prepared on the surface of foam nickel substrate by in-situ electrodeposition. NiFe-LDH/Mo(OS)electrode showed excellent OER performance and long-term stability in 1 M KOH solution, and the overpotentia was only 220 mV at a current density of 10 mA/cm^(2). At high current densities of 100, 500 mA/cm^(2), low overpotential of 253, 304 mV could also be achieved. The results demonstrate that the extraordinary OER performance of NiFe-LDH/Mo(OS)electrodes can be attributed to the synergistic effect of Mo(OS)and NiFe-LDH, which greatly promotes the conversion of Feto Feactive species and enhances the formation of oxygen vacancies. The collaborative preparation method provides help for the rationa construction and design of heterogeneous electrocatalysts to achieve efficient water decomposition.