Electrical Discharge Induced Bulk-to-Nanoparticle Transformation: Nano High-Entropy Carbide as Catalysts for Hydrogen Evolution Reaction,Advanced Functional Materials

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Electrical Discharge Induced Bulk-to-Nanoparticle Transformation: Nano High-Entropy Carbide as Catalysts for Hydrogen Evolution Reaction
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-06-24 , DOI: 10.1002/adfm.202203787
Shiyu Niu ₁ , Zhenwen Yang ₁ , Fugong Qi ₁ , Ying Han ₂ , Zizheng Shi ₃ , Qiwen Qiu ₄ , Xiaopeng Han ₅ , Ying Wang ₁ , Xiwen Du ₃

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High-entropy carbide (HEC) is a promising alternative to precious metal catalysts for the hydrogen evolution reaction (HER). However, the preparation of nanoscale HECs is a great challenge although many methods have been developed to prepare bulk HEC materials. Herein, an electrical discharge induced bulk-to-nanoparticle transformation method is reported, by which well dispersed sub-10 nm high entropy (MoWVNbTa)C nanoparticles with high-density surface defects can be directly obtained by centrifugation of the waste liquid produced during wire-cut electrical discharge machining of bulk HEC. The resultant HEC nanoparticles exhibit excellent catalytic activity and durability for HER, which is attributed to the combination of unique microstructure generated during the extremely nonequilibrium thermodynamic process and enhanced electronic effects induced by high configurational entropy. This facile and cost-effective bulk-to-nanoparticle transformation method can be extended to other conductive materials and shed light on the development of high-performance catalysts.

中文翻译：

放电诱导的块体到纳米粒子的转变：纳米高熵碳化物作为析氢反应的催化剂

高熵碳化物 (HEC) 是用于析氢反应 (HER) 的贵金属催化剂的有前途的替代品。然而，尽管已经开发了许多方法来制备散装 HEC 材料，但纳米级 HEC 的制备是一个巨大的挑战。本文报道了一种放电诱导的体积到纳米粒子的转化方法，通过离心线过程中产生的废液，可以直接获得分散良好且具有高密度表面缺陷的亚 10 nm 高熵 (MoWVNbTa)C 纳米粒子。大块HEC的切割放电加工。所得的 HEC 纳米粒子对 HER 表现出优异的催化活性和耐久性，这归因于极端非平衡热力学过程中产生的独特微观结构和高构型熵引起的增强电子效应的结合。这种简便且具有成本效益的块体到纳米粒子的转化方法可以扩展到其他导电材料，并为高性能催化剂的开发提供启示。

更新日期：2022-06-24

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