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Transformation of Two-Dimensional Iron Sulfide Nanosheets from FeS2 to FeS as High-Rate Anodes for Pseudocapacitive Sodium Storage
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-12-04 , DOI: 10.1021/acsaem.0c02590 Yang Wu 1 , Yuyu Wang 2 , Shengqi Shao 1 , Yuanming Ma 1 , Junjun Zhang 3 , Wenpei Kang 2 , Jun Xu 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-12-04 , DOI: 10.1021/acsaem.0c02590 Yang Wu 1 , Yuyu Wang 2 , Shengqi Shao 1 , Yuanming Ma 1 , Junjun Zhang 3 , Wenpei Kang 2 , Jun Xu 1
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Exploration of advanced anodes is significant for fabricating high-performance sodium ion batteries (SIBs). Two-dimensional (2D) transition-metal sulfide nanosheets have attracted great interest owing to their fascinating electrochemical performance. In this work, pyrite FeS2 nanosheets (FeS2 NSs) and their conversion to hexagonal FeS nanosheets with carbon coating (FeS/C NS) are designed as robust and high-rate anodes of SIBs. Transformation from the FeS2 NS to FeS/C NS by one-step annealing is investigated. Benefitting from the surface carbon coating and 2D morphology with large lateral size and thin thickness, the FeS/C NS possesses enhanced electron conductivity and ion diffusion coefficients, has a short ion diffusion distance and abundant active sites, and exhibits accelerated reaction kinetics. Consequently, the FeS/C NS shows significantly improved cycling stability and rate capability relative to the FeS2 and FeS counterparts. The FeS/C NS anode maintains a stable reversible capacity of 388 mA h g–1 after 300 cycles at 1 A g–1. Impressive capacities of 438 and 391 mA h g–1 can be yielded, respectively, at high current densities of 5 and 10 A g–1, thereby exhibiting superior high rate capability.
中文翻译：
二维硫化铁纳米片从FeS 2到FeS的高速率阳极转变，用于伪电容性钠存储
探索先进的阳极对于制造高性能钠离子电池（SIB）具有重要意义。二维（2D）过渡金属硫化物纳米片由于其令人着迷的电化学性能而引起了极大的兴趣。在这项工作中，将黄铁矿FeS 2纳米片（FeS 2 NSs）以及将其转换为带有碳涂层的六边形FeS纳米片（FeS / C NS）作为SIB的坚固且高速率阳极。从FeS 2转变通过一步退火法研究了从NS到FeS / C的NS。FeS / C NS得益于表面碳涂层和横向尺寸大且厚度薄的二维形态，具有增强的电子传导性和离子扩散系数，短的离子扩散距离和丰富的活性位点，并具有加速的反应动力学。因此，相对于FeS 2和FeS ，FeS / C NS显示出明显改善的循环稳定性和速率能力。FeS / C NS阳极在1 A g –1下循环300次后，保持388 mA hg –1的稳定可逆容量。在5和10 A g –1的高电流密度下，可分别产生438和391 mA hg –1的强大能力，从而展现出卓越的高速率能力。
更新日期：2020-12-28
中文翻译：
二维硫化铁纳米片从FeS 2到FeS的高速率阳极转变，用于伪电容性钠存储
探索先进的阳极对于制造高性能钠离子电池（SIB）具有重要意义。二维（2D）过渡金属硫化物纳米片由于其令人着迷的电化学性能而引起了极大的兴趣。在这项工作中，将黄铁矿FeS 2纳米片（FeS 2 NSs）以及将其转换为带有碳涂层的六边形FeS纳米片（FeS / C NS）作为SIB的坚固且高速率阳极。从FeS 2转变通过一步退火法研究了从NS到FeS / C的NS。FeS / C NS得益于表面碳涂层和横向尺寸大且厚度薄的二维形态，具有增强的电子传导性和离子扩散系数，短的离子扩散距离和丰富的活性位点，并具有加速的反应动力学。因此，相对于FeS 2和FeS ，FeS / C NS显示出明显改善的循环稳定性和速率能力。FeS / C NS阳极在1 A g –1下循环300次后，保持388 mA hg –1的稳定可逆容量。在5和10 A g –1的高电流密度下，可分别产生438和391 mA hg –1的强大能力，从而展现出卓越的高速率能力。
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