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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Boosting electrochemical activity via manipulating the d-band center of CoNi2Se4/MXene heterostructure for supercapacitor application

关键字:Transition metal selenidesMXeneD -band centerElectrochemical activitySupercapacitor

摘要:Heteroatom substitution stands as a promising strategy to boost the redox activity of transition metal selenides in supercapacitors; nonetheless, the underlying mechanisms that govern this enhanced activity have yet to be fully elucidated. It is presented that d-band center can be utilized as a descriptor to elucidate the redox activity. Within this context, we employ CoNi2Se4/MXene heterostructure as a paradigm, wherein CoNi2Se4 nanoplates are meticulously dispersed on MXene, thereby fostering a more efficient ion diffusion pathway to the redox reaction sites. Subsequently, phosphorus (P) heteroatoms, characterized by lower electronegativity and elevated ionization energy, are incorporated into CoNi2Se4/MXene architecture, which upshifts the d-band center of Ni/Co active sites in CoNi2Se4 close to the Fermi level, resulting in a depletion in the occupancy of antibonding orbitals upon interaction with the O 2p orbital from electrolyte ion OH- . This enhances the interfacial charge transfer and ensures robust OH- adsorption, thereby boosting redox activity. Meanwhile, P doping also introduces Se vacancies, facilitating the ion adsorption and diffusion. Leveraging these advancements, the prepared cathode delivers a higher specific capacitance and retains a better cycling stability. This investigation not only delineates criteria for heteroatom selection but also sheds light on the intricate mechanisms of heteroatom substitution, offering a fresh perspective on the orbital-scale manipulation to augment the redox activity of supercapacitor electrodes.

卷号:513

期号:-

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