Enhancing potassium-ion storage of Bi2S3 through external–internal dual synergism: Ti3C2Tx compositing and Cu2+ doping

IF 19.5 1区 材料科学 Q1 CHEMISTRY, PHYSICAL Carbon Energy Pub Date : 2024-04-17 DOI:10.1002/cey2.563
Dawei Sha, Yurong You, Rongxiang Hu, Jianxiang Ding, Xin Cao, Yuan Zhang, Long Pan, ZhengMing Sun
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Abstract

Potassium-ion batteries (PIBs) offer a cost-effective and resource-abundant solution for large-scale energy storage. However, the progress of PIBs is impeded by the lack of high-capacity, long-life, and fast-kinetics anode electrode materials. Here, we propose a dual synergic optimization strategy to enhance the K+ storage stability and reaction kinetics of Bi2S3 through two-dimensional compositing and cation doping. Externally, Bi2S3 nanoparticles are loaded onto the surface of three-dimensional interconnected Ti3C2Tx nanosheets to stabilize the electrode structure. Internally, Cu2+ doping acts as active sites to accelerate K+ storage kinetics. Various theoretical simulations and ex situ techniques are used to elucidate the external–internal dual synergism. During discharge, Ti3C2Tx and Cu2+ collaboratively facilitate K+ intercalation. Subsequently, Cu2+ doping primarily promotes the fracture of Bi2S3 bonds, facilitating a conversion reaction. Throughout cycling, the Ti3C2Tx composite structure and Cu2+ doping sustain functionality. The resulting Cu2+-doped Bi2S3 anchored on Ti3C2Tx (C-BT) shows excellent rate capability (600 mAh g–1 at 0.1 A g–1; 105 mAh g–1 at 5.0 A g–1) and cycling performance (91 mAh g–1 at 5.0 A g–1 after 1000 cycles) in half cells and a high energy density (179 Wh kg–1) in full cells.

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通过内外双重协同作用增强 Bi2S3 的钾离子储存:Ti3C2Tx 复合和 Cu2+ 掺杂
钾离子电池(PIB)为大规模能源储存提供了一种成本效益高且资源丰富的解决方案。然而,由于缺乏高容量、长寿命和快速动力学阳极电极材料,钾离子电池的发展受到了阻碍。在此,我们提出了一种双重协同优化策略,通过二维复合和阳离子掺杂来提高 Bi2S3 的 K+ 储存稳定性和反应动力学。从外部看,Bi2S3 纳米颗粒被负载到三维互连的 Ti3C2Tx 纳米片表面,以稳定电极结构。在内部,Cu2+ 的掺杂作为活性位点加速了 K+ 的存储动力学。各种理论模拟和原位技术被用来阐明外部-内部双重协同作用。在放电过程中,Ti3C2Tx 和 Cu2+ 共同促进了 K+ 的插层。随后,Cu2+ 的掺杂主要促进了 Bi2S3 键的断裂,推动了转换反应。在整个循环过程中,Ti3C2Tx 复合结构和 Cu2+ 掺杂保持了功能性。最终在 Ti3C2Tx(C-BT)上锚定的 Cu2+ 掺杂 Bi2S3 在半电池中显示出卓越的速率能力(0.1 A g-1 时为 600 mAh g-1;5.0 A g-1 时为 105 mAh g-1)和循环性能(1000 次循环后 5.0 A g-1 时为 91 mAh g-1),在全电池中显示出较高的能量密度(179 Wh kg-1)。
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来源期刊
Carbon Energy
Carbon Energy Multiple-
CiteScore
25.70
自引率
10.70%
发文量
116
审稿时长
4 weeks
期刊介绍: Carbon Energy is an international journal that focuses on cutting-edge energy technology involving carbon utilization and carbon emission control. It provides a platform for researchers to communicate their findings and critical opinions and aims to bring together the communities of advanced material and energy. The journal covers a broad range of energy technologies, including energy storage, photocatalysis, electrocatalysis, photoelectrocatalysis, and thermocatalysis. It covers all forms of energy, from conventional electric and thermal energy to those that catalyze chemical and biological transformations. Additionally, Carbon Energy promotes new technologies for controlling carbon emissions and the green production of carbon materials. The journal welcomes innovative interdisciplinary research with wide impact. It is indexed in various databases, including Advanced Technologies & Aerospace Collection/Database, Biological Science Collection/Database, CAS, DOAJ, Environmental Science Collection/Database, Web of Science and Technology Collection.
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Issue Information Cover Image, Volume 6, Number 10, October 2024 Back Cover Image, Volume 6, Number 10, October 2024 Interface and doping engineering of V2C-MXene-based electrocatalysts for enhanced electrocatalysis of overall water splitting Issue Information
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