分子工程策略协同提升 MoSe ₂ 储锌性能研究

Synergistically boosting the zinc-ion storage capability of MoSe ₂ via multiple molecular engineering strategies

摘要

MoSe₂ 凭借其良好的稳定性与结构可调性成为锌离子电池正极材料的有利候选之一,然而其较窄的层间距及相对较差的导电性限制了在锌离子电池中的进一步应用.通过简单的溶剂热法制备出了含有1T相的空心球状 MoSe₂ 正极材料.得益于相工程策略与结构工程策略等双重分子工程策略的协同运用,制备的1T空心 MoSe₂ 正极在0.10 A·g^-1的电流密度下表现出127.5 mAh·g^-1的比容量,循环100圈后仍能维持90.5 mAh·g^-1的比容量.相比于未改性的 MoSe₂ 正极,1T空心 MoSe₂ 正极表现出了显著提升的储锌性能与循环性能,为 MoSe₂ 基正极在锌离子电池中的进一步应用提供了可行策略.

Abstract

MoSe ₂ possesses great potential in serving as cathode material for zinc-ion batteries owing to its favorable stability and structural tunability, while its comparatively narrow interlayer distance and poor conductivity limit its further applications. Herein, the hollow spherical MoSe ₂ with high ratio of 1T phase was fabricated via a facile solvothermal method. By virtue of the synergistic effect of phase engineering and structural engineering strategies, the proposed 1T hollow MoSe ₂ nanosphere delivers a high capacity of 127.5 mAh·g ^-1 at 0.10 A·g ^-1, and maintains a favorable capacity of 90.5 mAh·g ^-1 after 100 cycles. Compared to the pristine MoSe ₂, the proposed 1T hollow MoSe ₂ nanosphere presents the significantly improved zinc-ion storage capability and cycling performance, thus providing an effective way to promote the potentials of MoSe ₂-based cathodes in zinc-ion batteries.

关键词

锌离子电池 / MoSe ₂ / 储锌性能 / 分子工程策略 / 动力学提升

Key words

zinc-ion batteries / MoSe ₂ / zinc-ion storage capability / molecular engineering strategies / enhanced kinetics

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基金资助

国家自然科学基金(52502245)