MoSe2 nanosheets perpendicularly grown on graphene with Mo–C bonding for sodium-ion capacitors
MoSe2 nanosheets perpendicularly grown on graphene with Mo–C bonding for sodium-ion capacitors
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MoSe2 纳米片在石墨烯上垂直生长，并具有 Mo-C 键合，用于钠离子电容器
DOI：
10.1016/j.nanoen.2018.03.002
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发表时间：
2018-05
期刊：
影响因子：
17.6
通讯作者：
Guozhong Cao
中科院分区：
文献类型：
--
作者：
Xu Zhao;Wei Cai;Ying Yang;Xuedan Song;Zachary G. Neale;Yu Li;Jiehe Sui;Guozhong Cao
二维（2D） MoSe2/石墨烯纳米复合材料作为钠离子电池（SIBs）负极材料具有巨大的潜力。在这项工作中，我们报告了通过表面活性剂导向的水热反应，在石墨烯上通过Mo-C键合，控制定向，层间扩展的MoSe2纳米片的生长。由此产生的2D纳米复合材料具有强电子耦合，促进了电子和na离子在界面上的转移以及na离子的可逆插入/提取，实现了快速的赝电容性na离子存储，降低了电压滞后，并且具有超过1500次循环的优异耐久性。密度泛函理论（DFT）计算表明，MoSe2/石墨烯在界面处建立了电荷积累，促进了钠离子通过界面的传输。这种优异的钠离子存储能力推动了它们在钠离子电容器（sic）中的潜在应用。作为概念验证，以MoSe2/石墨烯复合材料为阳极，活性炭为阴极组装的混合SIC模型在0.5 - 3v的电压窗口内提供了令人印象深刻的82 W h kg - 1的能量密度和10,752 W kg - 1的功率输出。SIC还提供了卓越的倍率能力（将电流密度从0.1增加到25.6 a g−1后，电容保持率为66%）和可循环性（在5 a g−1下，超过5000次循环，电容保持率为81%），这表明了弥合传统电池和超级电容器之间性能差距的希望。本文提出的基于分层杂化、化学键合和层间工程相结合的策略，对于开发下一代清洁能源系统的先进电极材料具有很大的前景。
Abstract Two-dimensional (2D) MoSe2/graphene nanocomposites show great potential as anode materials for sodium ion batteries (SIBs). In this work, we report the controlled growth of oriented, interlayer-expanded MoSe2 nanosheets on graphene with Mo–C bonding via a surfactant-directed hydrothermal reaction. The resulting 2D nanocomposite with strong electronic coupling facilitates both electron and Na-ion transfer across the interface and reversible insertion/extraction of Na-ion, enabling fast pseudocapacitive Na-ion storage with reduced voltage hysteresis and excellent durability over 1500 cycles. Density Functional Theory (DFT) calculation demonstrated MoSe2/graphene established a charge accumulation at the interface and promoted sodium-ion transport through the interface. Such outstanding Na-ion storage capability propels their potential application in sodium-ion capacitors (SICs). As a proof-of-concept, a model hybrid SIC was demonstrated by assembling with MoSe2/graphene composite as anode and activated carbon as cathode, delivering an impressive energy density of 82 W h kg−1 and power output of 10,752 W kg−1 within a voltage window of 0.5–3 V. The SIC also delivered a superior rate capability (66% capacitance retention after increasing the current density from 0.1 to 25.6 A g−1) and cyclability (81% capacitance retention over 5000 cycles at 5 A g−1), which shows promise for bridging the performance gap between conventional batteries and supercapacitors. The proposed strategy based on hierarchical hybridization combined with chemical bonding and interlayer engineering may hold great promise for developing advanced electrode materials for next-generation clean energy systems.
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