Yang Yang, Ruijie Zhu, Gang Wu, Wuhai Yang, Huijun Yang, Eunjoo Yoo
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引用次数: 0
摘要
开发高度可逆的锌(Zn)金属阳极对于确定可充电水性锌电池的可行性至关重要。我们的研究定量评估了氢演化反应(HER)如何对电池中锌的可逆性产生不利影响,并强调了基底设计在调节 HER 及其相关副反应方面的重要性。当氢化还原反应主导阴极反应时,锌电极的电镀/剥离效率较低,其特点是钝化层的大面积覆盖,其中包括电化学不活跃的锌。因此,我们提出了一种电镀策略,即在短时间内以高电流密度启动锌电镀,从而改变原始基底。事实证明,这种简单有效的方法可以抑制氢演化,并将电沉积模式转变为以锌还原为主的模式。值得注意的是,金属锌在不锈钢基底上显示出极高的平均可逆性,200 小时内可逆性达到 98.80%。此外,我们的击镀策略展示了在铜基底上实现高锌可逆性的适用途径,在 10 mAh cm-2 的高面积容量和低 N/P 比的高性能全锌电池条件下,540 小时的平均效率达到 99.83%。这项研究为今后研究 HER 的基本机制和优化锌基电池性能的策略奠定了基础。
Universal Strike-Plating Strategy to Suppress Hydrogen Evolution for Improving Zinc Metal Reversibility.
The development of highly reversible zinc (Zn) metal anodes is pivotal for determining the feasibility of rechargeable aqueous Zn batteries. Our research quantitively evalulates how the hydrogen evolution reaction (HER) adversely affects Zn reversibility in batteries and emphasizes the importance of substrate design in modulating HER and its associated side reactions. When the cathodic reaction is dominated by HER, the Zn electrode exhibits low plating/stripping efficiency, characterized by extensive coverage of a passivation layer that encompasses the electrochemical inactive Zn. Therefore, we propose a strike-plating strategy that modifies the pristine substrate by initiating Zn plating at a high current density for a short time. This straightforward and effective approach has been proven to suppress hydrogen evolution and transform the electrodeposition mode into one dominated by Zn reduction. Notably, Zn metal exhibits exceptionally high average reversibility of 98.80% over 200 h on a stainless steel substrate, which was typically precluded in aqueous electrolytes because of their favorable HER capability. Additionally, our strike-plating strategy demonstrates an appliable pathway to achieve high Zn reversibility on Cu substrate, showing an average efficiency of 99.83% over 540 h at a high areal capacity of 10 mAh cm-2 and high-performance Zn full cells with low N/P ratios. This research provides a foundation for future investigations into the underlying mechanisms of HER and strategies to optimize Zn-based battery performance.
期刊介绍:
ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.