J. Mater. Sci. Technol. ›› 2021, Vol. 70: 197-204.DOI: 10.1016/j.jmst.2020.08.039

• Research Article • Previous Articles     Next Articles

In-situ constructed Ru-rich porous framework on NiFe-based ribbon for enhanced oxygen evolution reaction in alkaline solution

Guoguo Xia, Lei Zuob, Xuan Lia, Yu Jinc, Ran Lia,**(), Tao Zhanga,d,*()   

  1. aKey Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing, 100191, China
    bSchool of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China
    cBeijing Spacecrafts, China Academy of Space Technology, Beijing, 100094, China
    dCenter for Advanced Analysis and Computational Science, Zhengzhou University, Zhengzhou, 450001, China
  • Received:2020-05-13 Revised:2020-06-06 Accepted:2020-06-06 Published:2021-04-20 Online:2021-04-30
  • Contact: Ran Li,Tao Zhang
  • About author:** E-mail: liran@buaa.edu.cn (R. Li),

Abstract:

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-Rux), 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-Rux a promising oxygen-evolving electrode material toward water electrolysis.

Key words: Ru, Nanoporous, High conductivity, Electrocatalyst, Oxygen evolution reaction