NiFe水滑石纳米片阵列负载Ru用于提升碱性电催化析氢和析氧性能

通过离子交换的方式将Ru负载到NiFe水滑石（LDH）纳米阵列表面得到（Ru/NiFe LDH）,Ru的引入显著提升了NiFe LDH的活性比表面积,暴露了更多的活性位点,同时调控了其电子结构,大大提升了其本征催化活性。在碱性条件下,催化析氢反应时仅需50 mV的过电位即可达到10 mA·cm^-2的电流密度,Tafel斜率为52.3 mV·dec^-1。而相同条件下原始NiFe LDH达到10mA·cm^-2的电流密度则需要226 mV的过电位,Tafel斜率为157.5 mV·dec^-1。同时制备的Ru/NiFe LDH也展现出了良好的析氧催化活性,在50 mA·cm^-2的电流密度下,过电位仅为231 mV,而NiFe LDH则需237 mV。Ru/NiFe LDH在长时间的电催化条件下依然能保持良好的工作稳定性。

Ru loaded on NiFe layered double hydroxide nanosheet arrays for boosting alkaline electrocatalytic hydrogen evolution and oxygen evolution abilities

Ru/NiFe LDH was obtained by introducing Ru into the surface of NiFe layered double hydroxide (LDH) nanosheet arrays by using the ion-exchange method. The introduction of Ru species promotes electrocatalytic performances of NiFe LDH toward water splitting with the assistance of the increased active surface areas with much more active sites, as well as optimal electronic structure. Ru anchored NiFe LDH (Ru/NiFe LDH) showed superior activity toward hydrogen evolution reaction with an overpotential of 50 mV to reach 10 mA·cm^-2 with Tafel slop of 52.3 mV·dec^-1, compared with that of NiFe LDH with 226 mV at 10 mA·cm^-2 and Tafel slope of 157.5 mV·dec^-1. In addition, Ru/NiFe LDH catalyst also exhibited excellent performance toward oxygen evolution reaction, requiring an overpotential of 231 mV to achieve 50 mA·cm^-2, outperforming that of NiFe LDH (237 mV). As expected, Ru/NiFe LDH catalyst showed robust tolerance to long-term working catalysis.