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Published on: June 21, 2017
Thermodynamically driven metal diffusion strategy for controlled synthesis of high-entropy alloy electrocatalysts
Huilin Li1, Han Zhu1, Shuhui Sun1
1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P. R. China. zhysw@jiangnan.edu.cn.
Abstract:
We report a thermodynamically driven metal diffusion strategy for the controlled synthesis of high-entropy alloy (HEA) nanocrystals using electrospun carbon nanofibers (CNFs) as nanoreactors. This conceptual pathway is resistant to high temperatures and produces a series of medium-entropy alloy (MEA) and HEA nanocrystals supported on CNFs by adjusting the numbers and kinds of elements. The FeCoNiCrMn/CNFs obtained the lowest overpotential of 345 mV at 50 mA cm-2 compared to MEA. The operando electrochemical Raman results indicate that the enhanced electron transfer from low-electronegativity Fe, Ni, Cr and Mn to the orbit of the Co atom makes Co a local negative charge center, leading to the decrease in absorption energy of OH.
