期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 70, 期 -, 页码 197-204出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.08.039
关键词
Ru; Nanoporous; High conductivity; Electrocatalyst; Oxygen evolution reaction
资金
- National Key Research and Development Program of China [2018YFA0703601, 2016YFB0300500]
- National Natural Science Foundation of China [51971006, 51771008]
- Beijing Natural Science Foundation [2172034]
- China Postdoctoral Science Foundation [2019M652566]
- Opening Project of Key Laboratory of Materials Processing and Mold
- Fundamental Research Funds for the Central Universities
A Ru-doped NiFe-based catalyst with a three-dimensional nanoporous surface was developed, meeting both performance and cost requirements for oxygen evolution reaction (OER) electrocatalysis. The novel material exhibited excellent OER performance due to its Ru-rich nanoporous architecture, multiple metal (hydro)oxides generated on the surface, and easy electron transfer facilitated by the firm bonding of nanoporous layer and the substrate.
Exploiting economical and high-efficient electrocatalysts of oxygen evolution reaction (OER) remains urgent in the field of sustainable hydrogen generation by water electrolysis. Ru- and Ir-based materials are benchmark electrocatalysts towards the OER, yet the precious metals are expensive and scarce. Herein, we develop a kind of Ru-doped NiFe-based catalyst with three-dimensional nanoporous surface (NP-Ru-x), which fulfils both performance and cost requirements for the OER electrocatalysis. This novel material can directly work as a support-free electrode and exhibits excellent OER performance with an ultralow overpotential of 245 mV at 10 mA cm(-2) and a small Tafel slope of 15 mV dec(-1) as well as low charge transfer resistance. The superior performance could be rationalized as follows: (1) Generated Ru-rich nanoporous architecture can not only supply a large number of active sites but also facilitate mass transfer at the electrode/electrolyte interface; ( 2) Multiple metals (hydro)oxides generated on the surface have the synergistic catalytic effect for the OER; (3) The in-situ generation of (hydro)oxides and the firm bonding of nanoporous layer and the substrate allow for easy electron transfer. These features make NP-Ru-x a promising oxygen-evolving electrode material toward water electrolysis. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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