| 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 |
| Efficient oxygen evolution reaction of CuCo2O4/NiFe-layered bimetallic hydroxide core-shell nanoflower sphere arrays |
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| 摘要: 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。 |
| 关键词: 界面工程 过渡金属氧化物 镍铁氢氧化物 析氧反应 核壳结构 |
| 基金项目: 江苏省重点研发计划项目（No.BE2022767）资助。 |
| Abstract: 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 NiFe-LDH 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. |
| Keywords: interfacial engineering transition metal oxide nickel-iron hydroxide oxygen evolution reaction core-shell structure |
| 投稿时间：2023-10-08 修订日期：2024-01-22 |
| 摘要点击次数: 150 |
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| 杨恩东,田浩泽,张珂,娄永兵.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[J].无机化学学报,2024,40(5):930-940. |
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