Redox-enhanced electrochemical capacitors (redox ECs) are a class of augmented electric double-layer capacitors utilizing reversible redox reactions of soluble redox couples in the electrolyte. These systems offer increased energy density, efficient power delivery, and simple construction. In this Perspective, we provide an overview of the emerging field of redox ECs, including the current status, advantages, and outstanding problems confronting their development. Our discussion is primarily focused on operating mechanisms and how they affect performance. We also provide a perspective on the advantage of dual-redox ECs and how to improve them based on fundamental design principles including self-discharge suppression strategies. Finally, we comment on best practices for device characterization, suggest performance-reporting protocols for redox ECs, and examine future directions for the field.

中文翻译：

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氧化还原增强型电化学电容器：性能评估的现状，机会和最佳实践

氧化还原增强型电化学电容器（redox ECs）是利用电解质中可溶性氧化还原对的可逆氧化还原反应的一类增强型双电层电容器。这些系统可提供更高的能量密度，有效的功率传输和简单的结构。在此观点中，我们概述了氧化还原EC的新兴领域，包括其发展所面临的现状，优势和突出问题。我们的讨论主要集中在运行机制以及它们如何影响性能。我们还提供了关于双氧化还原EC的优势的观点，以及如何基于基本设计原则（包括自放电抑制策略）对其进行改进。最后，我们评论了器件表征的最佳做法，提出了针对氧化还原EC的性能报告协议，