Wang Min, Li Yuanzhuo, Zhai Lingling, Zhang Xiang, Lau Shu Ping
Shandong Province Key Laboratory of Detection Technology for Tumor Makers, School of Chemistry and Chemical Engineering, Linyi University, Linyi, Shandong, P. R. China.
Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China.
Dalton Trans. 2021 Dec 7;50(47):17549-17558. doi: 10.1039/d1dt03638f.
Here, a new strategy that combines accessible active sites and multiphase synergy in a simple process is developed for constructing bifunctional electrocatalysts toward overall water splitting. By using metal-organic framework (MOF) nanosheets hydrothermally grown on pre-oxidized nickel foam (denoted by Co(OH)(BDC)/NiO/NF) as a precursor, two novel heterogeneous nanosheet arrays including a cobalt phosphide nanoparticle embedded carbon nanotube nanosheet array supported by phosphorized nickel foam (denoted by CoP-CNT/NiP/NF) and a cobalt phosphide nanorod decorated carbon nanosheet array supported by oxidized nickel foam (denoted by CoP-C/NiO/NF) are prepared. Both were confirmed to be highly efficient for hydrogen and oxygen evolution reactions. In particular, CoP-C/NiO/NF exhibits higher catalytic activity toward the hydrogen evolution reaction ( = -131 mV), promoted by the synergy of oxidized nickel foam. CoP-CNT/NiP/NF performs better in the oxygen evolution reaction ( = 301 mV), benefiting mainly from its improved electrochemically active surface area. The two catalysts match well in overall water splitting with satisfactory activity ( = 1.57 V) and stability when directly applied in a two-electrode cell. This method will bring new inspiration to maximize the electrocatalytic efficiency of MOF-derived catalysts for energy conversion applications in the future.
在此，开发了一种新策略，该策略在一个简单的过程中结合了可及的活性位点和多相协同作用，用于构建用于全水解的双功能电催化剂。通过使用水热生长在预氧化泡沫镍上的金属有机框架（MOF）纳米片（表示为Co(OH)(BDC)/NiO/NF）作为前驱体，制备了两种新型的异质纳米片阵列，包括由磷化泡沫镍支撑的嵌入钴磷纳米颗粒的碳纳米管纳米片阵列（表示为CoP-CNT/NiP/NF）和由氧化泡沫镍支撑的钴磷纳米棒修饰的碳纳米片阵列（表示为CoP-C/NiO/NF）。两者均被证实对析氢和析氧反应具有高效性。特别地，CoP-C/NiO/NF对析氢反应表现出更高的催化活性（ = -131 mV），这是由氧化泡沫镍的协同作用促进的。CoP-CNT/NiP/NF在析氧反应中表现更好（ = 301 mV），主要得益于其改善的电化学活性表面积。当直接应用于双电极电池时，这两种催化剂在全水解中表现出良好的匹配性，具有令人满意的活性（ = 1.57 V）和稳定性。该方法将为未来最大化MOF衍生催化剂在能量转换应用中的电催化效率带来新的灵感。
