离子液体增强质子转移并促进中性析氧反应

doi:10.61558/2993-074X.3549

电化学（中英文） ›› 2025, Vol. 31 ›› Issue (7): 2515001. doi: 10.61558/2993-074X.3549

所属专题： “燃料电池电催化及绿氢制备工程”专题文章

• 论文 • 上一篇

离子液体增强质子转移并促进中性析氧反应

陈明星^a, 刘念^a, 杜子翯^a, 齐静^a^,^*(), 曹睿^b^,^*()

^a 河南师范大学材料科学与工程学院，河南省先进电化学储能材料设计与循环利用工程技术研究中心，河南新乡 453007
^b 陕西师范大学化学化工学院，应用表面与胶体化学教育部重点实验室，陕西西安 710119

收稿日期:2025-03-25 修回日期:2025-04-30 接受日期:2025-05-16 发布日期:2025-05-16 出版日期:2025-07-28
通讯作者: 齐静,曹睿 E-mail:qijing2020@htu.edu.cn;ruicao@snnu.edu.cn

Ionic Liquid Enhanced Proton Transfer for Neutral Oxygen Evolution Reaction

Ming-Xing Chen^a, Nian Liu^a, Zi-He Du^a, Jing Qi^a^,^*(), Rui Cao^b^,^*()

^a Henan Engineering Research Center of Design and Recycle for Advanced Electrochemical Energy Storage Materials, School of Materials Science and Engineering, Henan Normal University, Xinxiang 453007, China
^b Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China

Received:2025-03-25 Revised:2025-04-30 Accepted:2025-05-16 Online:2025-05-16 Published:2025-07-28
Contact: Jing Qi, Rui Cao E-mail:qijing2020@htu.edu.cn;ruicao@snnu.edu.cn

1. 2515001-Ionic Liquid Enhanced Proton Transfer for Neutral Oxygen Evolution Reaction-supporting information.pdf(3018KB)

摘要/Abstract

摘要：

中性析氧反应对于新能源转换与存储领域而言意义十分重大。然而，缓慢的质子耦合电子转移步骤限制了析氧反应的整体效率。因此，开发高活性的中性析氧催化剂具有十分重要的研究价值。本文通过一种简便的策略成功制备出离子液体（IL）修饰的CoSn(OH)₆纳米立方体（CoSn(OH)₆-IL）。修饰的离子液体并未改变CoSn(OH)₆的结构特征，但可有效调控活性位点附近的质子活性。与未经修饰的CoSn(OH)₆纳米立方体相比较而言，CoSn(OH)₆-IL对中性析氧反应展示出更高的本征活性。例如，在1.8 V（相对于可逆氢电极）的电压下，CoSn(OH)₆-IL的析氧电流密度是CoSn(OH)₆的4倍。根据pH依赖性实验、原位电化学阻抗图谱、化学探针实验和同位素效应等测试结果可以得出，CoSn(OH)₆-IL催化剂中的界面离子液体可以作为质子转移介体，促进中性析氧反应的质子转移速率并提高析氧中间体的表面覆盖度，有效降低活化能垒，最终能够加速析氧反应动力学。这项工作提供了一种简单且有效的策略促进质子耦合电子转移过程，并有利于指导析氧催化剂的合理设计。

关键词: 电催化, 析氧反应, 离子液体, 质子转移, CoSn(OH)₆立方体

Abstract:

The development of highly active catalyst in pH-neutral media for oxygen evolution reaction (OER) is critical in the field of renewable energy storage and conversion. Nevertheless, the slow kinetics of proton-coupled electron transfer (PCET) hinders the overall OER efficiency. Herein, we report an ionic liquid (IL) modified CoSn(OH)₆ nanocubes (denoted as CoSn(OH)₆-IL), which could be prepared through a facile strategy. The modified IL would not change the structural characteristics of CoSn(OH)₆, but could effectively regulate the local proton activity near the active sites. The CoSn(OH)₆-IL exhibited higher intrinsic OER performances than the pristine CoSn(OH)₆ in neutral media. For example, the current density of CoSn(OH)₆-IL at 1.8 V versus reversible hydrogen electrode (RHE) was about 4 times higher than that of CoSn(OH)₆. According to the pH-dependent kinetic investigations, operando electrochemical impedance spectroscopic and chemical probe tests, and deuterium kinetic isotope effects, the interfacial layer of IL could be utilized as a proton transfer mediator to promote the proton transfer, which enhances the surface coverage of OER intermediates and reduces the activation barrier. Consequently, the sluggish OER kinetics would be efficiently accelerated. This study provides a facile and effective strategy to facilitate the PCET processes and is beneficial to guide the rational design of OER electrocatalysts.

Key words: Electrocatalysis, Oxygen evolution reaction, Ionic liquid, Proton transfer, CoSn(OH)₆ nanocube

陈明星, 刘念, 杜子翯, 齐静, 曹睿. 离子液体增强质子转移并促进中性析氧反应[J]. 电化学（中英文）, 2025, 31(7): 2515001.

Ming-Xing Chen, Nian Liu, Zi-He Du, Jing Qi, Rui Cao. Ionic Liquid Enhanced Proton Transfer for Neutral Oxygen Evolution Reaction[J]. Journal of Electrochemistry, 2025, 31(7): 2515001.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.61558/2993-074X.3549

https://electrochem.xmu.edu.cn/CN/Y2025/V31/I7/2515001

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参考文献 57

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离子液体增强质子转移并促进中性析氧反应

Ionic Liquid Enhanced Proton Transfer for Neutral Oxygen Evolution Reaction

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