Conductive few-layered 1T-MoSe2/MXene as a highly-efficient catalyst for accelerating bidirectional sulfur redox kinetics in Li-S batteries
Conductive few-layered 1T-MoSe2/MXene as a highly-efficient catalyst for accelerating bidirectional sulfur redox kinetics in Li-S batteries
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DOI：
10.1016/j.jallcom.2022.168250
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发表时间：
2023-03
影响因子：
6.2
通讯作者：
Wei Wang;Xinyin Wang;Jiongwei Shan;Liguo Yue;Weilong Wang;Yunyong Li
中科院分区：
文献类型：
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作者：
Wei Wang;Xinyin Wang;Jiongwei Shan;Liguo Yue;Weilong Wang;Yunyong Li
锂硫电池（LSB）因其在重量/体积容量方面的优点而被视为下一代新型储能装置的潜在候选者。然而，LSB 的实际应用仍然受到穿梭行为和极其缓慢的双向硫氧化还原动力学的严重限制。在此，通过一步溶剂热反应在 MXene 纳米片上原位生长几层 1T-MoSe2，构建了一种作为高效硫主体的双功能导电 1T-MoSe2/MXene 双向催化剂。实验和DFT理论分析表明，1T-MoSe2/MXene具有高电子电导率、强吸附能力和丰富的活性位点，可为LiPSs提供强大的捕获和催化转化能力以及Li2S的均匀沉积和溶解，从而有效抑制LiPSs在LSBs中的穿梭行为。得益于增强的双向硫氧化还原动力学和吸附能力，S/1T-MoSe2/MXene 正极具有稳定的长循环稳定性，在 0.2 C 下循环 500 次后，容量保持率为 64.2%（每次循环容量衰减 0.07%）。此外，在 0.2 C 下循环 200 次后，获得了 6.9 mAh cm−2 的高面积容量和约 73.1% 的良好容量保持率。 0.1 C。这项工作为开发双功能导电催化剂以加速 LiPS 的催化转化提供了一种新方法。
Lithium-sulfur batteries (LSBs) have been regarded as a prospective candidate for next-generation late-model energy storage device due to their merits in gravimetric/ volumetric capacity. However, the practical use of LSBs is still severely limited by the shuttle behavior and extremely slow bidirectional sulfur redox kinetics. Herein, a dual-functional conductive 1T-MoSe2/MXene bidirectional catalyst as a high-efficiency sulfur host was constructed by few-layer 1T-MoSe2in-situ growth on MXene nano-flakes through one-step solvothermal reaction. Experimental and DFT theoretical analysis reveal that 1T-MoSe2/MXene possess a high electronic conductivity, strong adsorption ability, and abundant active sites, which can provide the strong capture and catalytic conversion ability for LiPSs and uniform deposition and dissolution of Li2S, thus effectively inhibiting the LiPSs shuttle behavior in LSBs. Benefiting from the enhanced bidirectional sulfur redox kinetics and adsorption capacity, the S/1T-MoSe2/MXene cathode delivers a stable long cycling stability with a capacity retention of64.2% (capacity fading per cycle of 0.07%) after 500 cycles at 0.2 C. Furthermore, a high areal capacity of 6.9 mAh cm−2and good capacity retention of ∼73.1% were obtained after 200 cycles at 0.1 C. This work provides a novel way for the development of dual-functional conductive catalyst to accelerate the catalytic conversion of LiPSs.