一步法合成的FeOOH/黑磷纳米复合材料协同实现体系优异的析氧性能

通过水热法,在黑磷(BP)纳米片表面生长FeOOH纳米材料,制备出FeOOH/BP纳米复合材料。作为电化学析氧反应(OER)催化剂,该复合材料在20 mA·cm^-2时的过电位仅为191 mV,Tafel斜率为49.9 mV·dec^-1;在循环1 000圈后,过电位仅仅增加了3 mV,且循环过程中元素价态不变,表现出优秀的稳定性。纳米FeOOH负载于BP表面,客观上能隔断氧气对BP的氧化,保护BP的载流子传导性能。同时,生长的FeOOH颗粒尺度小,结晶性弱,这有利于丰富其活性位点,增大活性面积。

One-step synthesis of FeOOH/black phosphorus nano-composite:Synergistic achieving system's excellent oxygen evolution property

In the study, by hydrothermal method, FeOOH nano-materials were grown on the surface of black phosphorus (BP) nanosheets to prepare FeOOH/BP composite. As an oxygen evolution reaction (OER) electrocatalyst, its overpotential was only 191 mV at the current density of 20 mA·cm^-2, with a Tafel slope of 49.9 mV·dec^-1. After 1 000 cycles, its overpotential only increased by 3 mV, showing the best stability. FeOOH was loaded on the BP surface, which can hinder BP oxidation and enhance its carrier conduction ability. And the loaded nano-FeOOH had a small scale and a weak crystalline nature, which is conducive to enriching their active site and increasing the active area. The synergy of this binary system is the main reason for the OER performance improvement. By comparison, it was found that the active area of FeOOH/BP reached 26.9 mF·cm^-2, which was 2.3 times that of pure FeOOH (11.8 mF·cm^-2) and 1.6 times that of pure BP nanosheets (16.8 mF·cm^-2). The excellent activity of this composite material is not only attributed to the morphology change of FeOOH, which significantly expands its effective active area but also benefits from the encapsulated BP, which has better dispersion and stronger conductivity.