CuCo2O4/NiFe层状双金属氢氧化物核壳纳米花球阵列的高效析氧反应

采用界面工程策略在泡沫镍(NF)上制备了 CuCo₂O₄/NiFe 层状双金属氢氧化物(LDH) (CuCo₂O₄/NiFe-LDH@NF)核壳纳米花球阵列。研究表明,电子通过CuCo₂O₄和NiFe-LDH耦合界面发生转移,导致核心CuCo₂O₄处于富电子状态,从而提高了反应速率。非晶态NiFe-LDH外壳不仅为电子/物质提供更多的传输通道和增加活性位点。同时,还能在电催化析氧反应(OER)中保护核心 CuCo₂O₄免受强碱腐蚀。因此,在 1.0 mol·L^-1 KOH 溶液中,将 CuCo₂O₄/NiFe-LDH@NF 用作 OER 催化剂时,仅需 191mV 的低过电位即可实现 10 mA·cm^-2的电流密度和 31 mV·dec^-1的低 Tafel斜率。此外,CuCo₂O₄/NiFe-LDH@NF 在长时间的工作中能够保证催化性能、晶体结构、形貌结构和组成的稳定。

Efficient oxygen evolution reaction of CuCo2O4/NiFe-layered bimetallic hydroxide core-shell nanoflower sphere arrays

Using an interface engineering strategy, we successfully synthesized a core-shell nano-flower array of CuCo₂O₄/NiFe-layered bimetallic hydroxide (LDH) on nickel foam (NF) (CuCo₂O₄/NiFe-LDH@NF). The research indicates that electrons undergo transfer across the coupled interface of CuCo₂O₄ and NiFe-LDH, resulting in the enrichment of the CuCo₂O₄ core in electron density and thereby enhancing reaction kinetics. The amorphous NiFeLDH shell not only provides additional channels for electron/material transport and increases active sites but also effectively shields the core CuCo₂O₄ from strong alkali corrosion during the oxygen evolution reaction (OER) in electrocatalysis. Therefore, when employed as an OER catalyst in a 1.0 mol·L^-1 KOH solution, CuCo₂O₄/NiFe-LDH@NF required only a low overpotential of 191 mV to achieve a current density of 10 mA·cm^-2 and a low Tafel slope of 31 mV·dec^-1. Furthermore, CuCo₂O₄/NiFe-LDH@NF demonstrated stability in catalytic performance, crystal structure, morphological structure, and composition during prolonged operation.