青岛科技大学  English 
李桂村
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教授 博士生导师  
硕士生导师  

教师拼音名称:liguicun

出生日期:1974-05-12

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所在单位:材料学院综合办公室

职务:材料科学与工程学院院长

学历:博士研究生

办公地点:材料楼225房间

性别:男

联系方式:guicunli@qust.edu.cn Tel:13730918070

学位:工学博士

职称:教授

毕业院校:中国海洋大学

学科:

材料物理与化学

曾获荣誉:

2016-01-01 山东省有突出贡献的中青年专家

2012-11-07 山东省第三届优秀研究生指导教师

2011-04-01 青岛拔尖人才

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Introducing 3s/p-3p orbital hybridization to stabilize and activate Ni3S4 for efficient hydroxyl ion storage

关键字:ELECTRODE; SUPERCAPACITOR; SULFIDES; EXCHANGE

摘要:Transition metal sulfides have been identified as promising battery type electrode materials for supercapacitor (SC) owing to their exceptional conductivity and substantial theoretical capacities. However, the fast SC capacity decay often occurs, which is attributed to the instability of the sulfur framework caused by the presence of metal cations with strong Jahn-Teller distortion and/or limited orbital interactions between cations and sulfur (primarily involving 3d-3p interaction). Herein, we successfully develop a robust and durable sulfur framework through incorporating intense 3s/p-3p orbital hybridization into the structure, with Ni3S4 serving as a representative example. The modified sulfide exhibits exceptional stability in SC performance, achieving 93.1 % capacity retention after 10,000 cycles at a higher current density of 20 A g(-1). Moreover, this orbital hybridization strategy also well regulates the d-band center of Ni and introduces the S vacancies, which not only promotes adsorption of the OH- ions but also renders lower diffusion barrier, thus realizing higher specific capacity of 295 mAh g(-1) at a current density of 1 A g(-1) and fast reaction kinetics. This study provides a new perspective to understand the structural stability and offers new opportunities to extend sulfide electrodes enabling high performance through modification in orbital interaction.

卷号:139

期号:

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