过电位
析氧
塔菲尔方程
材料科学
纳米线
化学工程
分解水
催化作用
电解质
氢氧化物
纳米技术
化学
电极
物理化学
电化学
生物化学
光催化
工程类
作者
Minglei Yan,Yun Zeng,Yifan Mou,Jinglu Hu,Wei Tang,Cheng-Lu Jiang,Qing Li,Yang Zhao
标识
DOI:10.1016/j.jallcom.2022.167465
摘要
Developing cost-effective, highly efficient, and durable oxygen evolution reaction (OER) catalysts is critical for improving the efficiency of hydrogen production from water splitting. Herein, we reported a novel OER catalyst composed of NiFe layered double hydroxide (NiFe-LDH) nanosheets on NiCo2O4 nanowires (NiCo2O4@NiFe-LDH) supported on carbon cloth through the hydrothermal method and subsequent electrodeposition. The three-dimension (3D) hierarchical architecture facilitates the diffusion of electrolyte ions and O2 release. Experimental results demonstrate that the electrons transfer from the highly conductive NiCo2O4 nanowires to the NiFe-LDH sheets, which could expedite the charge transfer significantly. Importantly, the tunable adsorption/desorption nature of the oxygenated intermediates was achieved through the local delocalization of spin state at the heterointerface through the bridging O2-. Benefiting from the heterostructure and synergistic effects between different components, the optimized NiCo2O4@NiFe-LDH-2 exhibits excellent OER performance with a low overpotential of 270 mV at 50 mA cm−2, a small Tafel slope of 74 mV dec−1 and a good durability for 25 h in 1 M KOH. This work provides a novel approach to fabricate advanced OER catalysts and is expected to be extended to other materials for energy conversion applications.
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