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
电子邮箱:
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
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
最后更新时间:..
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:-
是否译文:否