张猛   

张猛,副教授,硕士生导师,“泰山学者”团队核心成员。江苏省“科技副总”、青岛市十二届青年科技奖、青岛科技大学“科研新秀”、中国晶体学会会员、材料研究学会专业会员、中国化工学会高级会员、全国材料与器件科学家智库磁性材料与器件专家委员会常务委员、中国仪器仪表学会仪表功能材料分会电子元器件关键材料与技术专业委员会委员、国家自然科学基金/山东省自然科学基金/青岛市高新技术企业评审专家、SCI期刊《Frontiers ...Detials

Atomic insights of electronic states engineering of GaN nanowires by Cu cation substitution for highly efficient lithium ion battery

Release time:2023-10-19  Hits:

  • Key Words:HIGH-CAPACITY ANODE; OXIDE-ASSISTED SYNTHESIS; BINDER-FREE ANODE; LI-ION; HYBRID MATERIAL; DOPED GRAPHENE; CARBON; PERFORMANCE; NITRIDE; STORAGE
  • Abstract:Electronic engineering of gallium nitride (GaN) is critical for enhancement of its electrode performance. In this work, copper (Cu) cation substituted GaN (Cu-GaN) nanowires were fabricated to understand the electronically engineered electrochemical performance for Li ion storage. Cu cation substitution was revealed at atomic level by combination of X-ray photoelectron spectroscopy (XPS), X-ray absorption fine structure (XAFS), density functional theory (DFT) simulation, and so forth. The Cu-GaN electrode delivered high capacity of 813.2 mA h g(-1) at 0.1 A g(-1) after 200 cycles, increased by 66% relative to the unsubstituted GaN electrode. After 2000 cycles at 10 A g(-1), the reversible capacity was still maintained at 326.7 mA h g(-1). The DFT calculations revealed that Cu substitution introduced the impurity electronic states and efficient interatomic electron migration, which can enhance the charge transfer efficiency and reduce the Li ion adsorption energy on the Cu-GaN electrode. The ex-situ SEM, TEM, HRTEM, and SAED analyses demonstrated the reversible intercalation Li ion storage mechanism and good structural stability. The concept of atomic-arrangement-assisted electronic engineering strategy is anticipated to open up opportunities for advanced energy storage applications. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press.
  • Volume:67
  • Issue:
  • Translation or Not:no