Hierarchically nitrogen-doped carbon wrapped Ni0.6Fe0.4Se2 binary-metal selenide nanocubes with extraordinary rate performance and high pseudocapacitive contribution for sodium-ion anodes
Hierarchically nitrogen-doped carbon wrapped Ni0.6Fe0.4Se2 binary-metal selenide nanocubes with extraordinary rate performance and high pseudocapacitive contribution for sodium-ion anodes
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分层氮掺杂碳包裹的 Ni0.6Fe0.4Se2 二元金属硒化物纳米立方体具有出色的倍率性能和对钠离子阳极的高赝电容贡献
DOI：
10.1039/d0ta08423a
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发表时间：
2021-01
影响因子：
11.9
通讯作者：
Long-jiao Chang
中科院分区：
文献类型：
--
作者：
Jian Feng;Shao-hua Luo;Sheng-xue Yan;Yang Zhan;Qing Wang;Yahui Zhang;Xin Liu;Long-jiao Chang
过渡金属硒化物因其具有可观的理论容量和本征电导率，被认为是钠离子电池(SIB)的先进电极材料。然而，容量衰减快、速率性能差等问题仍然阻碍了它们的大规模应用。本论文以多巴胺包覆的普鲁士蓝类似物(Ni-3[Fe(CN)(6)](2)，Ni-F-PBA)为原料，通过低能硒化和碳化工艺合成了一种层次化掺氮碳(NC)包裹的二元过渡金属硒化合物(Ni0.6Fe0.4Se2@NC，简称nF@NC)纳米材料。纳米颗粒良好的形貌、较大的比表面积、与碳基质的紧密接触以及二元金属硒的较好结合，可以通过它们的协同作用实现优异的钠存储性能。值得注意的是，含氮化合物有效地转化为具有功能Fe-N-C键的氮掺杂碳，促进了Na+的更快转移。结果表明，所制得的NFSNC作为SIB负极材料具有优异的倍率性能(0.2A g(-1)下的倍率性能(449.3 mA h g(-1))和10 A g(-1)下的289.5 mA h g(-1))以及稳定的长期循环性能(372.4 mA h g(-1))。动力学分析表明，其优异的储钠性能主要归功于其独特的纳米多能级复合结构所产生的较大的伪电容贡献。
Because of their considerable theoretical capacity and intrinsic conductivity, transition metal selenides have been considered as advanced electrode materials for sodium-ion batteries (SIBs). However, fast capacity fade and inferior rate performance still impede their large-scale application. Herein, a hierarchically nitrogen-doped carbon (NC) wrapped binary transition metal selenide (Ni0.6Fe0.4Se2@NC, termed NFS@NC) nanomaterial derived from polydopamine coated Prussian blue analogs (Ni-3[Fe(CN)(6)](2), Ni-F-PBA) was synthesized through a low-energy selenization and carbonization process. The excellent morphology, large surface area, intimate contact of nanoparticles with the carbon matrix and better combination of binary metal selenides can achieve outstanding sodium storage performance through their synergy. Notably, nitrogen-containing compound are efficiently converted to nitrogen-doped carbon with functional Fe-N-C bonds, facilitating the faster transfer of Na+. As a result, the as-obtained NFS@NC showed superior rate performance (449.3 mA h g(-1) at 0.2 A g(-1) and 289.5 mA h g(-1) at 10 A g(-1)) and stable long-term cyclability (372.4 mA h g(-1) after 2000 cycles at 5 A g(-1)) as an anode material for SIBs. Kinetic analysis showed that the excellent Na-storage performance of the NFS@NC anode was mainly due to the large pseudocapacitive contribution resulting from the unique nano-multilevel composite structure.
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