CuxNi1-xS纳米片电催化性能增强

IF 4.5 3区 化学 Q1 Chemical Engineering
Nandini Trivedi , Mohammad Balal , Vikas Patel , Sudipta R. Barman , C.K. Sumesh , Pratik M. Pataniya
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引用次数: 4

摘要

为了实现长期的能量储存和转化,设计用于双功能电催化水分解的商用和高性能催化剂至关重要。本文报道了在无粘结剂和大面积塑料片电极上制备CuxNi1-xS纳米片的有效方法。CuxNi1-xS NSs在cu用量优化的情况下,整体的水分解效果较好。合成的催化剂在1.0 M KOH碱性介质中表现良好,可同时析氢和析氧,过电位低,动力学高效,电解耐久性好。令人印象深刻的是,发现cu掺杂提高了化学和环境稳定性,有利于实际应用。通过改变电子结构,cu原子的掺杂促进了电子的易流动,使得CuxNi1-xS的电催化活性显著提高,HER的过电位为152 mV, OER的过电位为189 mV。双功能水分裂电池在电池电压为1.74 V时产生10 mA/cm2的电流密度。令人鼓舞的是,通过优化CuxNi1-xS基电极的化学成分,在2.61 V电位下可以产生80 mA/cm2的电流密度。CuxNi1-xS在20 mA/cm2的双功能电解条件下表现出优异的稳定性,持续时间超过18小时。本研究为开发增强型双功能电催化剂提供了一种可行的技术,可用于在一系列可再生能源应用中替代贵金属。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhanced electrocatalytic performance of CuxNi1-xS Nanoflakes for overall water splitting

For long-term energy storage and conversion, the design of commercial and high-performance catalysts for bifunctional electrocatalytic water splitting is critical. We report the efficient method to prepare CuxNi1-xS Nanoflakes (NFs) on binder-free and large area plastic chip electrodes. CuxNi1-xS NSs show superior overall water splitting with optimized Cu-amount. The synthesized catalysts perform well in 1.0 M KOH alkaline media for simultaneous hydrogen and oxygen evolution, with relatively low overpotential, efficient kinetics, and sustained electrolysis durability. Impressively, it is found that Cu-doping enhances the chemical and environmental stability, beneficial for the practical application. By modifying the electronic structure, Cu-atom doping promotes the easy flow of electrons, which leads to incredible rise in the electrocatalytic activity with over potential of 152 mV for HER and 189 mV for OER on CuxNi1-xS. Bi-functional water splitting cell generates 10 mA/cm2 current density at cell voltage of 1.74 V. Encouragingly, current density of 80 mA/cm2 can be generated at potential of 2.61 V with optimized chemical composition of CuxNi1-xS based electrodes. CuxNi1-xS demonstrates excellent stability for bi-functional water electrolysis at 20 mA/cm2 for more than 18 h. This research lays forth a viable technique for developing enhanced bi-functional electrocatalysts that can be used to substitute noble metals in a range of renewable energy applications.

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来源期刊
Journal of Electroanalytical Chemistry
Journal of Electroanalytical Chemistry Chemical Engineering-General Chemical Engineering
CiteScore
7.50
自引率
6.70%
发文量
912
审稿时长
>12 weeks
期刊介绍: The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.
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