In-situ constructed Ru-rich porous framework on NiFe-based ribbon for enhanced oxygen evolution reaction in alkaline solution
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第11期
论文作者：Guoguo Xi Lei Zuo Xuan Li Yu Jin Ran Lia Tao Zhang
文章页码：197 - 204
摘 要：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-Ruxa promising oxygen-evolving electrode material toward water electrolysis.
Guoguo Xi1，Lei Zuo2，Xuan Li1，Yu Jin3，Ran Lia1，Tao Zhang1,4
1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education),School of Materials Science and Engineering,Beihang University2. School of Aerospace Engineering,Beijing Institute of Technology3. Beijing Spacecrafts,China Academy of Space Technology4. Center for Advanced Analysis and Computational Science,Zhengzhou University
摘 要：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-Ruxa promising oxygen-evolving electrode material toward water electrolysis.
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