Gan Yonghao, Li Zhi, Ye Ying, Dai Xiaoping, Nie Fei, Yin Xueli, Ren Ziteng, Wu Baoqiang, Cao Yihua, Cai Run, Zhang Xin, Song Weiyu
State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering and Environment, China University of Petroleum-Beijing, 18 Fuxue Road, Changping District, Beijing, 102249, P. R. China) E-mail: E.
College of Science, China University of Petroleum-Beijing, 18 Fuxue Road, Changping District, Beijing, 102249, P. R. China.
ChemSusChem. 2022 Oct 21;15(20):e202201205. doi: 10.1002/cssc.202201205. Epub 2022 Sep 19.
It is of great significance to design highly efficient electrocatalysts with abundant earth elements instead of precious metals for water splitting. Herein, Mo-doped NiFe-layered double hydroxides/NiSe heterostructure (Mo-NiFe LDH/NiSe) was fabricated by coupling Mo-doped NiFe LDH and NiSe on nickel foam (NF). The heterostructure electrocatalyst showed ultra-low overpotential (250 mV) and remarkable durability for oxygen evolution reaction (OER) at 150 mA cm . Both theoretical and experimental results confirmed that Mo doping and interfacial synergism induced the interfacial charge redistribution and the lifted d-band center to weaken the energy barrier (EB) of the formation of OOH . Mo doping also facilitated the surface reconstruction of NiFe LDH into Ni(Fe)OOH as the active sites under electro-oxidation process. This work provides a facile strategy for electronic modulation and surface reconstruction of OER electrocatalyst by transition metal doping and heterostructure generation.
设计具有丰富地球元素而非贵金属的高效电催化剂用于水分解具有重要意义。在此，通过将Mo掺杂的NiFe层状双氢氧化物（Mo-NiFe LDH）与NiSe耦合在泡沫镍（NF）上制备了Mo掺杂的NiFe层状双氢氧化物/NiSe异质结构（Mo-NiFe LDH/NiSe）。该异质结构电催化剂在150 mA cm⁻²的析氧反应（OER）中表现出超低过电位（250 mV）和出色的耐久性。理论和实验结果均证实，Mo掺杂和界面协同作用诱导了界面电荷重新分布以及d带中心的升高，从而削弱了OOH形成的能垒（EB）。Mo掺杂还促进了NiFe LDH在电氧化过程中表面重构为作为活性位点的Ni(Fe)OOH。这项工作为通过过渡金属掺杂和异质结构生成对OER电催化剂进行电子调制和表面重构提供了一种简便策略。
