Zhang Zheng, Han Lei, Tao Kai
School of Materials Science & Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, P. R. China.
Dalton Trans. 2024 Jan 23;53(4):1757-1765. doi: 10.1039/d3dt03631f.
Exploring non-noble metal dual-functional electrocatalysts with high activity and stability for water splitting is highly desirable. In this study, using zeolitic imidazolate framework-L (ZIF-L) nanoarrays as the precursor, manganese oxide-decorated porous nickel-cobalt phosphide nanosheet arrays have been prepared on nickel foam (denoted as MnO/NiCoP/NF) through cation etching, phosphorization and electrodeposition, which are utilized as an efficient dual-functional electrocatalyst for overall water splitting. The hierarchical porous nanosheet arrays provide abundant active sites for the electrochemical process, while the MnO modification induces strong interfacial interaction, benefiting charge transfer. Thus, the MnO/NiCoP/NF exhibits excellent electrocatalytic activity toward the hydrogen evolution reaction (HER, overpotential of 93 mV at 10 mA cm), oxygen evolution reaction (OER, overpotential of 240 mV at 10 mA cm) and overall water splitting (cell voltage of 1.59 V at 10 mA cm). Furthermore, it shows superior stability during continuous overall water splitting for 200 h. This work provides a simple and effective approach for developing efficient non-noble metal dual-functional catalysts for overall water splitting.
探索具有高活性和稳定性的用于水分解的非贵金属双功能电催化剂是非常有必要的。在本研究中，以沸石咪唑酯骨架-L（ZIF-L）纳米阵列作为前驱体，通过阳离子蚀刻、磷化和电沉积在泡沫镍上制备了氧化锰修饰的多孔镍钴磷化物纳米片阵列（记为MnO/NiCoP/NF），将其用作高效的用于全水分解的双功能电催化剂。分级多孔纳米片阵列为电化学过程提供了丰富的活性位点，而MnO修饰诱导了强烈的界面相互作用，有利于电荷转移。因此，MnO/NiCoP/NF对析氢反应（HER，在10 mA cm时过电位为93 mV）、析氧反应（OER，在10 mA cm时过电位为240 mV）和全水分解（在10 mA cm时电池电压为1.59 V）表现出优异的电催化活性。此外，在连续全水分解200小时期间它显示出优异的稳定性。这项工作为开发用于全水分解的高效非贵金属双功能催化剂提供了一种简单有效的方法。
