WSe2/MoSe2 with a better-matched heterointerface dominating high-performance potassium/sodium storage

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-07-24 DOI:10.1007/s12598-024-02906-3

Zhi-Yuan Song, Yun-Dong Cao, Lin-Lin Fan, Jian Song, Yi Feng, Hong Liu, Cai-Li Lv, Guang-Gang Gao

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Abstract

Constructing a valid heterointerface with a built-in electric field is an effective strategy for designing energy storage anodes with exceptional efficiency for potassium-ion batteries (PIBs) and sodium-ion batteries (SIBs). In this study, WSe₂/MoSe₂ nanosheets with a better-matched and stable heterojunction interface were uniformly embedded in carbon nanofiber frameworks (WSe₂/MoSe₂/CNFs). The ion/electron transfer kinetics were facilitated by heterointerfaces with an enlarged effective utilization range. Meanwhile, the heterointerface directed electron transfer from MoSe₂ to WSe₂ and had significant potassium adsorption capability. The ultra-high pseudocapacitance contribution originating from the heterostructure and morphological features of the WSe₂/MoSe₂ nanosheets contributed to enhancing high-rate energy storage. Moreover, in situ X-ray diffraction and ex situ X-ray photoelectron spectroscopy revealed the potassification/depotassification behavior of the WSe₂/MoSe₂/CNFs during the conversion reaction. Consequently, after 500 cycles at 5 A·g⁻¹, the WSe₂/MoSe₂/CNF anode demonstrated an outstanding long-term cycling performance of 125.6 mAh·g⁻¹ for PIBs. While serving as a SIB electrode, it exhibited an exceptional rate capability of 243.5 mAh·g⁻¹ at 20 A·g⁻¹. With the goal of developing high-performance PIB/SIB electrode materials, the proposed strategy, based on heterointerface adaptation engineering, is promising.

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具有更佳匹配异质表面的 WSe2/MoSe2 在高性能钾/钠存储中占据主导地位

构建具有内置电场的有效异质界面是设计钾离子电池（PIB）和钠离子电池（SIB）高效储能阳极的有效策略。在这项研究中，WSe2/MoSe2 纳米片被均匀地嵌入碳纳米纤维框架（WSe2/MoSe2/CNFs）中，形成了匹配性更好、更稳定的异质结界面。异质界面扩大了有效利用范围，促进了离子/电子转移动力学。同时，异质界面引导电子从 MoSe2 转移到 WSe2，并具有显著的钾吸附能力。WSe2/MoSe2 纳米片的异质结构和形态特征所产生的超高伪电容有助于提高高速率储能。此外，原位 X 射线衍射和原位 X 射线光电子能谱揭示了 WSe2/MoSe2/CNFs 在转化反应过程中的析氧/去析出行为。因此，在 5 A-g-1 的条件下循环 500 次后，WSe2/MoSe2/CNF 阳极在 PIB 方面表现出 125.6 mAh-g-1 的出色长期循环性能。在用作 SIB 电极时，它在 20 A-g-1 的条件下表现出 243.5 mAh-g-1 的优异速率能力。为实现开发高性能 PIB/SIB 电极材料的目标，基于异质表面适应工程的拟议策略前景广阔。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.