Lifetime of the Gas Evolution Electrode of the Zn–H2 Storage System

IF 2.6 4区工程技术 Q3 ELECTROCHEMISTRY

Fuel Cells Pub Date : 2024-07-12 DOI:10.1002/fuce.202300209

Robert Hahn, Oren Rosenfeld, Chaim Markheim, Andreas Schamel

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Abstract

A novel electrically chargeable galvanic system is presented that efficiently stores energy in the form of zinc and releases hydrogen and electricity upon discharge. In this concept, oxygen is released at the gas electrode during charging, and zinc oxide is reduced to metallic zinc at the counter electrode. When the cell is discharged on demand, the zinc is converted back to zinc oxide, but the water is reduced at the gas electrode to produce hydrogen. The system can therefore be used not only to store electricity—in combination with a fuel cell—but also as an on‐demand hydrogen generator, for example, for industrial use. When used as an electrical storage system, the overall round‐trip efficiency can approach 50%, significantly exceeding the efficiency of alternative power‐to‐gas technologies. There are no hydrogen storage or transportation losses. The electrochemical cell combines two breakthrough technologies: a bifunctional catalyst for hydrogen and oxygen evolution reaction that survives thousands of oxidation and reduction cycles, and a dendrite‐free deposition of thick, high‐capacity zinc coatings that can be cycled almost indefinitely thanks to pulsed charge current and intelligent electronic control.

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Zn-H2 储存系统气体进化电极的寿命

本文介绍了一种新型可充电电镀系统，它能以锌的形式有效储存能量，并在放电时释放氢气和电能。在这一概念中，充电时氧气在气体电极上释放，氧化锌在反电极上还原成金属锌。当电池按需放电时，锌被转化回氧化锌，但水在气体电极上被还原产生氢气。因此，该系统不仅可与燃料电池结合用于储电，还可按需用作氢气发生器，例如工业用氢气发生器。当用作电力存储系统时，整体往返效率可接近 50%，大大超过其他电转气技术的效率。没有氢气储存或运输损失。这种电化学电池结合了两项突破性技术：一种是用于氢氧进化反应的双功能催化剂，可在数千次氧化和还原循环中存活；另一种是无枝晶沉积的高容量厚锌涂层，由于采用了脉冲充电电流和智能电子控制，几乎可以无限次循环。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fuel Cells 工程技术-电化学

CiteScore

5.80

自引率

3.60%

发文量

审稿时长

3.7 months

期刊介绍： This journal is only available online from 2011 onwards. Fuel Cells — From Fundamentals to Systems publishes on all aspects of fuel cells, ranging from their molecular basis to their applications in systems such as power plants, road vehicles and power sources in portables. Fuel Cells is a platform for scientific exchange in a diverse interdisciplinary field. All related work in -chemistry- materials science- physics- chemical engineering- electrical engineering- mechanical engineering- is included. Fuel Cells—From Fundamentals to Systems has an International Editorial Board and Editorial Advisory Board, with each Editor being a renowned expert representing a key discipline in the field from either a distinguished academic institution or one of the globally leading companies. Fuel Cells—From Fundamentals to Systems is designed to meet the needs of scientists and engineers who are actively working in the field. Until now, information on materials, stack technology and system approaches has been dispersed over a number of traditional scientific journals dedicated to classical disciplines such as electrochemistry, materials science or power technology. Fuel Cells—From Fundamentals to Systems concentrates on the publication of peer-reviewed original research papers and reviews.

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