Simultaneous pseudocapacitive oxidation and oxygen evolution reaction: reciprocity or incompatibility?†

IF 6.1 1区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR
Xinpeng Huang, Yingnan Yan, Xuehua Yan, Qianzuo Liu, Feng Zhang, Jili Wu, Jianmei Pan, Zohreh Shahnavaz and Jamile Mohammadi Moradian
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Abstract

With the increasing demand for energy conversion and storage and importance of research on multifunctional materials in recent years, more and more studies focus on pseudocapacitive energy storage (PES) and electrocatalytic oxygen evolution reaction (OER). As is well known, optimizing materials could reduce the overpotential required for catalyzing OER, which brings the starting point of OER reaction closer to another type of oxidation reaction in the system—pseudocapacitive oxidation reaction (POR)—or even results in the potential range overlap of these two types of oxidation reactions, especially in alkaline aqueous electrolyte systems. The OER potential is low enough that when the above situation occurs, the role of active sites on the material and how they affect the final performance has long been overlooked. We designed and synthesized a novel FeOOH/high-entropy-LDH to deeply explore these questions. We attempt to explain the reasons for the potential overlap and its implications. Furthermore, the function transformation of active sites is discovered. Briefly, it is a challenge for materials with high OER catalytic activity to exhibit excellent PES performance. Recommendations for the activation stages and the correct selection of potentials (windows) are proposed for pseudocapacitance and OER tests of such material. This work aims to alert scientists to the complexity of such material research, and hopefully, through joint efforts to obtain recognized and feasible standards for material design and testing, pave the way for subsequent research in this field.

Abstract Image

Abstract Image

同时赝电容氧化和析氧反应:互易性还是不相容?
近年来,随着人们对能量转换和存储的需求日益增加以及多功能材料研究的重视,赝电容储能(PES)和电催化析氧反应(OER)的研究越来越受到关注。众所周知,优化材料可以降低催化OER所需的过电位,从而使OER反应的起点更接近系统中的另一种氧化反应——伪电容性氧化反应(POR),甚至导致这两种氧化反应的电位范围重叠,特别是在碱性水电解质体系中。OER电位足够低,当上述情况发生时,活性位点在材料上的作用以及它们如何影响最终性能一直被忽视。为了深入探索这些问题,我们设计并合成了一种新型的FeOOH/高熵ldh。我们试图解释潜在重叠的原因及其含义。此外,还发现了活性位点的功能转换。简而言之,具有高OER催化活性的材料要表现出优异的PES性能是一个挑战。对此类材料的赝电容和OER测试的激活阶段和电位(窗口)的正确选择提出了建议。这项工作旨在提醒科学家注意这类材料研究的复杂性,并希望通过共同努力获得公认的、可行的材料设计和测试标准,为该领域的后续研究铺平道路。
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来源期刊
Inorganic Chemistry Frontiers
Inorganic Chemistry Frontiers CHEMISTRY, INORGANIC & NUCLEAR-
CiteScore
10.40
自引率
7.10%
发文量
587
审稿时长
1.2 months
期刊介绍: The international, high quality journal for interdisciplinary research between inorganic chemistry and related subjects
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