Self-supported AlFeNiCoMo high-entropy alloy with micropillar array structure for efficient oxygen evolution reaction
Source abstract
Abstract
The development of low-cost and efficient electrocatalysts for oxygen evolution reaction (OER) is crucial for the application of hydrogen energy. In this work, a self-supported AlFeCoNiMo high entropy alloy with a uniformly distributed micropillar array structure on the surface is prepared by melt spinning followed by dealloying. The catalyst exhibits a low overpotential of 228, 265, and 318 mV to drive the current densities of 10, 100, and 1000 mA/cm2, a small Tafel slope of 51 mV/dec, and excellent long-term stability for 30 h in 1.0M KOH electrolyte for OER. The high catalytic activity is attributed to the unique micropillar array with rich active sites and the synergistic effect between multiple metallic elements. The good stability of the catalyst results from the steady micropillar array structure and the formation of oxyhydroxides on the surface during long-term catalysis. This work provides a facile and scalable method for the preparation of self-supported, low-cost, and high-performance OER electrocatalysts.
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Research context
OpenAlex topics: Electrocatalysts for Energy Conversion · Nanoporous metals and alloys · Supercapacitor Materials and Fabrication
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering, Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University 1 , Nanjing 211189, China
School of Materials Science and Engineering, Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing Institute of Technology 2 , Nanjing 211167, China
Funding
National Natural Science Foundation of China · Jiangsu Provincial Key Research and Development Program
References (38)
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