Semimetallic 1T ' WTe2 Nanorods as Anode Material for the Sodium Ion Battery
Semimetallic 1T ' WTe2 Nanorods as Anode Material for the Sodium Ion Battery
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DOI：
10.1021/acs.energyfuels.8b00454
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发表时间：
2018
期刊：
影响因子：
5.3
通讯作者：
Chang Haixin
中科院分区：
文献类型：
--
作者：
Hong Meiling;Li Jie;Zhang Wenfeng;Liu Shantang;Chang Haixin
首次将高结晶度的半金属1 T ′ WTe 2纳米棒（WTe 2NRs）和WTe 2纳米花（WTe 2NFs）用作钠离子电池（SIB）的负极材料。通过一种新的两步法合成WTe 2NR和NF，水热衍生的WO 3在化学气相沉积过程后转化为WTe 2NR和NF。WTe 2形貌对WTe 2 SIB阳极的性能有很大影响。WTe 2NR在钠离子存储中显示出高容量，具有优异的速率和循环稳定性。在0.1 A g-1的电流密度下，WTe 2 NRs的初始放电容量为442 mA h g-1，100次循环后仍保持在221 mA h g-1，而WTe 2 NFs的初始放电容量为324 mA h g-1，40次循环后仍保持在260 mA h g-1。从第二次循环开始，WTe 2NR和NF阳极的库仑效率分别高达98.83%和97.96%。
Highly crystalline semimetallic 1T′ WTe2nanorods (WTe2NRs) and WTe2nanoflowers (WTe2NFs) are applied as anode materials for the sodium ion battery (SIB) for the first time. WTe2NRs and NFs are synthesized through a novel two-step process with hydrothermal-derived WO3transformed into WTe2NRs and NFs after a chemical vapor deposition process. The performance of the WTe2SIB anode is highly influenced by WTe2morphology. WTe2NRs have shown high capacity in sodium ion storage, with an excellent rate and cycling stability. The initial discharge capacity for WTe2NRs is 442 mA h g–1at the current density of 0.1 A g–1and remains at 221 mA h g–1after 100 cycles, while WTe2NFs show 324 mA h g–1initial capacity and remain at 260 mA h g–1after 40 cycles. The Coulombic efficiencies of both WTe2NR and NF anodes are as high as 98.83 and 97.96% from the second cycle, respectively.