New Class of Electrocatalysts Based on 2D Transition Metal Dichalcogenides in Ionic Liquid
New Class of Electrocatalysts Based on 2D Transition Metal Dichalcogenides in Ionic Liquid
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DOI：
10.1002/adma.201804453
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发表时间：
2019-01-25
影响因子：
29.4
通讯作者：
Salehi-Khojin, Amin
中科院分区：
文献类型：
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作者：
Majidi, Leily;Yasaei, Poya;Salehi-Khojin, Amin
传统电催化剂的优化已经达到了一个阻碍进展的基本物理因素，包括不同基本反应步骤的热动力学特征之间的内在标度关系，非能斯特行为，以及催化剂的电子结构。这表明，目前使用的电催化剂类别可能不足以满足未来的需要。本研究报道了一类基于二维二卤化物的新型材料的合成和表征，包括V族和VI族过渡金属的硫化物、硒和碲化物，它们在含锂盐的非质子化介质中对氧还原和析出反应都表现出良好的催化性能。这些材料的反应速率比以前报道的这些反应的催化剂要高得多。高活性的原因是具有绝热电子转移能力的金属边缘和涉及离子-液体电解液的助催化剂效应。这些新材料有望对其他核心电催化反应具有高活性，并为储能和催化技术的发展开辟道路。
The optimization of traditional electrocatalysts has reached a point where progress is impeded by fundamental physical factors including inherent scaling relations among thermokinetic characteristics of different elementary reaction steps, non-Nernstian behavior, and electronic structure of the catalyst. This indicates that the currently utilized classes of electrocatalysts may not be adequate for future needs. This study reports on synthesis and characterization of a new class of materials based on 2D transition metal dichalcogenides including sulfides, selenides, and tellurides of group V and VI transition metals that exhibit excellent catalytic performance for both oxygen reduction and evolution reactions in an aprotic medium with Li salts. The reaction rates are much higher for these materials than previously reported catalysts for these reactions. The reasons for the high activity are found to be the metal edges with adiabatic electron transfer capability and a cocatalyst effect involving an ionic-liquid electrolyte. These new materials are expected to have high activity for other core electrocatalytic reactions and open the way for advances in energy storage and catalysis.