Deep eutectic solvent-induced synthesis of Ni-Fe catalyst with excellent mass activity and stability for water oxidation

查看全文 作　　者：Ruichang [1]Xue;Mengwei [1]Guo;Zhuoming [1]Wei;Qibo [1,2]Zhang 机构地区：[1]Key Laboratory of Ionic Liquids Metallurgy,Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming,650093,China;[2]State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province,Kunming,650093,China 出　　处：《Green Energy & Environment》索引2023年第8卷第3期,共12页 基　　金：support of the National Natural Science Foundation of China (21962008);Yunnan Province Excellent Youth Fund Project (202001AW070005);Candidate Talents Training Fund of Yunnan Province (2017PY269SQ,2018HB007);Yunnan Ten Thousand Talents Plan Young&Elite Talents Project (YNWR-QNBJ-2018-346)。 摘　　要：Ni-Fe bimetallic electrodes are currently recognized as a kind of benchmark transition metal-based oxygen evolution reaction(OER)electrocatalysts.Facile synthesis of Ni-Fe bimetallic electrode materials with excellent catalytic activity and satisfied stability by a simple and low-cost route is still a big challenge.Herein,well-defined Ni-Fe nanoparticles in-situ developed on a planar Fe substrate(Ni-Fe NPs/Fe)is fabricated via a facile one-step galvanic replacement reaction(GRR)carried out in an Ethaline-based deep eutectic solvent(DES).The prepared Ni-Fe NPs/Fe exhibits outstanding OER performance,which needs an overpotential of only 319 mV to drive a current density of 10 mA cm^(-2),with a small Tafel slope of 41.2 mV dec^(-1) in 1.0 mol L^(-1) KOH,high mass activity(up to 319.78 A g^(-1) at an overpotential of 300 mV)and robust durability for 200 h.Impressively,the Ni-Fe bimetallic oxygen-evolution electrode obtained from the Ethaline-based DES is catalytically more active and durable than that of its counterpart derived from the 4.2 mol L^(-1) NaCl aqueous solution.The reason for this is mainly related to the different morphology and surface state of the Ni-Fe catalysts obtained from these different solvent environments,particularly for the differences in phy-chemical properties,active species formed and deposition kinetics,offered by the Ethaline-based DES. 关 键 词：Ni-Fe catalysts Galvanic replacement reaction Deep eutectic solvent Oxygen evolution reaction