利用含五氧化二铌的硬碳基复合材料开发全铁氧化还原液流电池的新型阴极材料

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2024-10-04 DOI:10.1016/j.jelechem.2024.118694

Wallace de Jesus Moura , Isabella Campos Batista , Lindomar Gomes De Sousa , Débora Vilela Franco , Rafael Vicentini , Raíssa Venâncio , Hudson Zanin , Leonardo Morais Da Silva

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引用次数: 0

摘要

我们在本研究中报告了使用分散在塑化和硬化剂中的碳片合成的全铁 RFB 的新型阴极，从而在不含或含五氧化二铌（Nb2O5）的情况下（HC-Nb）获得了坚硬致密的碳（HC）材料。与传统石墨（如 800 mV）相比，这些阴极材料在酸性溶液中表现出优异的耐磨性和更大的水稳定性电位间隔（如 1200-1300 mV）。这些特性降低了使用实验室制造的电池在充电过程中发生氢进化反应（HER）的可能性。后者是基于阳极和阴极中分别存在的 Fe0/Fe2+ 和 Fe2+/Fe3+ 氧化还原偶。不同的原位和原位表征研究表明，碳氢化合物中 Nb2O5 的存在大大改变了其物理化学特性。经证实，含有 10 wt.% Nb2O5 的阴极具有最高的异质动力学速率常数 (k0)，代表了电子转移的电催化活性。全铁 RFB 充满电后的电动势（EMF）为 1.053 V。静电充电-放电（GCD）研究表明，经过 300 次循环后，库仑效率极高（88%）。为避免阳极表面形成氢氧化铁，有必要在电池运行过程中通过加酸来控制 pH 值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Development of new cathode materials for all-iron redox flow batteries using hard carbon-based composites containing niobium pentoxide

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Development of new cathode materials for all-iron redox flow batteries using hard carbon-based composites containing niobium pentoxide

We report in this study new cathodes for all-Fe RFBs synthesized using carbon flakes dispersed in plasticizing and hardening agents to obtain hard and dense carbon (HC) materials in the absence and presence (HC-Nb) of niobium pentoxide (Nb₂O₅). These cathode materials exhibited excellent resistance to wear in acidic solutions and larger potential intervals for water stability (e.g., 1200–1300 mV) compared to conventional graphite (e.g., 800 mV). These characteristics decreased the parasitic occurrence of hydrogen evolution reaction (HER) using a laboratory-made battery cell during the charging process. The latter was based on the Fe⁰/Fe²⁺ and Fe²⁺/Fe³⁺ redox couples present in the anode and cathode compartments, respectively. The different ex-situ and in-situ characterization studies evidenced that the presence of Nb₂O₅ in HCs substantially changed their physicochemical properties. The highest heterogenous kinetic rate constant (k⁰) representing the electrocatalytic activity for electron transfer was verified for the cathode containing 10 wt.% Nb₂O₅. An electromotive force (EMF) of 1.053 V was verified for the fully charged all-Fe RFB. Galvanostatic charge–discharge (GCD) studies revealed excellent coulombic efficiency (> 88 %) after 300 cycles. A pH control by acid addition as a function of the battery operation is necessary to avoid iron hydroxide formation on the anode’s surface.

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

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.