Ru doping induces the construction of a unique core-shell microflower self-supporting electrocatalyst for highly efficient overall water splitting

被引:23
作者
Ye, Lei [1 ]
Zhang, Yeqing [1 ]
Guo, Buwen [2 ]
Cao, Duanlin [1 ]
Gong, Yaqiong [1 ,3 ]
机构
[1] North Univ China, Sch Chem Engn & Technol, Taiyuan 030051, Shanxi, Peoples R China
[2] Xizang Minzu Univ, Sch Management, Xianyang 712082, Peoples R China
[3] Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Fujian, Peoples R China
关键词
LAYERED DOUBLE HYDROXIDE; OXYGEN EVOLUTION; NANOSHEET ARRAYS; LDH NANOSHEET; REDUCTION; PHOSPHIDE; GROWTH; FOAM;
D O I
10.1039/d1dt02341a
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Since the large reaction energy barrier caused by multi-step electron transfer processes of the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) gravely restricts the practical application of electrocatalytic water splitting, it is urgent to develop a dual-functional electrocatalyst which can effectively reduce the reaction energy barrier and actually speed up the reaction. Herein, the Ru species are doped into the complex of magnetite and FeNi-layered double hydroxide by a one-step oil bath method, and a self-supporting binder-free bifunctional electrocatalyst was synthesized on the surface of iron foam (named Ru-Fe3O4@FeNi-LDH/IF). The unique 3D core-shell microflower structure of Ru-Fe3O4@FeNi-LDH/IF, the combination of active ingredient and conductive substrate, together with the doping of Ru may immensely provide a large number of active sites, adjust the electronic structure, accelerate electron transfer, and thus greatly improve the electrocatalytic activity and durability. It is worth mentioning that when Ru-Fe3O4@FeNi-LDH/IF is used as the anode and cathode for overall water splitting, only 1.52 V battery voltage can generate a current density of 10 mA cm(-2), and also maintain a prominent stability for at least 36 hours. This work provides a feasible strategy for heteroatom-doping LDH as a bifunctional electrocatalyst.
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页码:13951 / 13960
页数:10
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