Electrodeposition-Potential Tuning Rejuvenates the Concurrent Preparation from α-Co(OH)2 with Larger Interlayer-Spacings to β-Co(OH)2

IF 4.7 4区材料科学 Q2 ELECTROCHEMISTRY

Batteries & Supercaps Pub Date : 2024-12-23 DOI:10.1002/batt.202400699

Xiangyu Wu, Meiqi Liu, Zhou Jiang, Jingjuan Li, Kexin Song, Aofei Wei, Detian Meng, Taowen Dong, Zhenhai Gao, Wei Zhang, Weitao Zheng

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Abstract

Electrodeposition is a popular method for preparing α-Co(OH)₂ as an electrode material for electrochemical energy storage. However, the preparation of technically important β-Co(OH)₂ through electrodeposition remains lacking thus far. Herein, we successfully prepared Co(OH)₂ in two phases, α- and β-Co(OH)₂, by simply adjusting the electrodeposition potentials, as evidenced by a package of microcopy and spectroscopy analysis. Benefited from a delicate embedding and sectioning technique that may inhibit the loss of interlayer water in microscopy analysis, we find the presence of Co tetrahedron in the interlayer of α-Co(OH)₂ results in a large interlayer spacing of 7.2 Å for the crystal plane (003) compared to β-Co(OH)₂, as well as a higher chemical valence of cobalt in electrodeposited β-Co(OH)₂. The large interlayer spacing creates wider ion channels and more active storage sites for effective energy storage. Consequently, the α-Co(OH)₂ electrode exhibits more competitive electrochemical performance compared to its β counterpart.

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电沉积电位调整使α-Co(OH)2的同步制备从具有较大层间距的α-Co(OH)2恢复到β-Co(OH)2

电沉积是制备α-Co(OH)2作为电化学储能电极材料的常用方法。然而，迄今为止，通过电沉积制备技术上重要的β-Co(OH)2仍然缺乏。本文通过简单地调整电沉积电位，成功地制备了α-和β-Co(OH)2两相的Co(OH)2，并通过一系列显微和光谱分析证明了这一点。得益于精细的包埋和切片技术，在显微镜分析中可以抑制层间水的损失，我们发现在α-Co(OH)2的层间存在Co四面体导致晶体平面（003）与β-Co(OH)2相比有7.2 Å的大层间距，并且在电沉积β-Co(OH)2中钴的化学价更高。大的层间距为有效的能量存储创造了更宽的离子通道和更多的活性存储位点。因此，α-Co(OH)2电极表现出比β电极更具竞争力的电化学性能。

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

Batteries & Supercaps Multiple-

CiteScore

8.60

自引率

5.30%

发文量

223

期刊介绍： Electrochemical energy storage devices play a transformative role in our societies. They have allowed the emergence of portable electronics devices, have triggered the resurgence of electric transportation and constitute key components in smart power grids. Batteries & Supercaps publishes international high-impact experimental and theoretical research on the fundamentals and applications of electrochemical energy storage. We support the scientific community to advance energy efficiency and sustainability.