电催化剂
材料科学
碳纳米管
阴极
双金属片
化学工程
碳纤维
X射线光电子能谱
电化学
纳米团簇
多硫化物
催化作用
复合数
纳米颗粒
多金属氧酸盐
纳米技术
电解质
电极
金属
化学
物理化学
复合材料
有机化学
工程类
冶金
作者
Qiuping Zhou,Xuecheng Zhang,Yuchao Wu,Xinyuan Jiang,Tangsuo Li,Ming Chen,Lubin Ni,Guowang Diao
出处
期刊:Small
[Wiley]
日期:2023-08-04
卷期号:19 (48)
标识
DOI:10.1002/smll.202304515
摘要
Al-S battery (ASB) is a promising energy storage device, notable for its safety, crustal abundance, and high theoretical energy density. However, its development faces challenges due to slow reaction kinetics and poor reversibility. The creation of a multifunctional cathode material that can both adsorb polysulfides and accelerate their conversion is key to advancing ASB. Herein, a composite composed of polyoxometalate nanohybridization-derived Mo2 C and N-doped carbon nanotube-interwoven polyhedrons (Co/Mo2 C@NCNHP) is proposed for the first time as an electrochemical catalyst in the sulfur cathode. This composite improves the utilization and conductivity of sulfur within the cathode. DFT calculations and experimental results indicate that Co enables the chemisorption of polysulfides while Mo2 C catalyzes the reduction reaction of long-chain polysulfides. X-ray photoelectron spectroscopy (XPS) and in situ UV analysis reveal the different intermediates of Al polysulfide species in Co/Mo2 C@NCNHP during discharging/charging. As a cathode material for ASB, Co/Mo2 C@NCNHP@S composite can deliver a discharge-charge voltage hysteresis of 0.75 V with a specific capacity of 370 mAh g-1 after 200 cycles at 1A g-1 .
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