Cai Mengke, Liu Qinglin, Zhao Yiyue, Wang Zhenyu, Li Yinle, Li Guangqin
MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
Dalton Trans. 2020 Jun 14;49(22):7436-7443. doi: 10.1039/d0dt00824a. Epub 2020 May 20.
Owing to the combination of intriguing activity and conductivity, hybrid compositions of layered double hydroxides (LDHs) and carbon-based materials have been extensively and widely applied to evolve oxygen gas during water splitting. Here, a facile in situ nucleation strategy was used to construct ultrafine NiFe-LDH nanosheets monodispersed on a carbon black (CB) substrate. Notably, this work displayed the interfacial impact of combining CB with NiFe-LDHs on electrocatalyst activation. Interestingly, the optimized NiFe-LDHs/CB composite displays a fast activation rate and excellent water oxidation performance on a glassy-carbon electrode (an overpotential of 226 mV at 10 mA cm; a Tafel slope of 57 mV dec). This is due to the high active area, low impedance and ultra-high active metal atom utilization rate, accelerating charge transfer at the interface during the activation process. More importantly, this work highlights the interfacial charge transfer effect during the activation process and supplies clues for designing electrocatalysts.
由于具有有趣的活性和导电性，层状双氢氧化物（LDHs）与碳基材料的混合组合物已被广泛应用于水分解过程中产生氧气。在此，采用一种简便的原位成核策略来构建单分散在炭黑（CB）基底上的超细NiFe-LDH纳米片。值得注意的是，这项工作展示了将CB与NiFe-LDHs结合对电催化剂活化的界面影响。有趣的是，优化后的NiFe-LDHs/CB复合材料在玻碳电极上显示出快速的活化速率和优异的水氧化性能（在10 mA cm时过电位为226 mV；塔菲尔斜率为57 mV dec）。这是由于高活性面积、低阻抗和超高的活性金属原子利用率，在活化过程中加速了界面处的电荷转移。更重要的是，这项工作突出了活化过程中的界面电荷转移效应，并为设计电催化剂提供了线索。
