Dr. Zhang Jie of Hunan University of science and technology has made progress in the study of defect regulated electronic transfer kinetics of graphene

Recently, Dr Zhang Jie, School of chemistry and chemical engineering, Hunan University of science and technology, has made progress in the study of defect regulated graphene electron transfer kinetics The related achievements were published in Applied Surface Science (app Surf SCI 2019, 491) under the title of "heterogeneous electron transfer kinetics of defective graphene investigated by scanning electronic microcopy" , 553-559） 。
Controlling the electrochemical activity of graphene has important applications in the fields of electrochemical sensing, electrocatalysis and electrochemical energy storage The electrochemical activity of graphene can be improved by changing the morphology, edge modification and defect introduction However, voltammetric and impedance methods have higher requirements for the sample consistency, and only the overall average electrochemical activity of the sample can be obtained Scanning electrochemical microscope can realize the electrochemical activity imaging of the micro area, combined with COMSOL finite element analysis method, it can realize the quantitative characterization of the electrochemical activity of the micro area The defect density of graphene can be quantitatively characterized by Raman spectroscopy The graphene with different defect density can be prepared by Ar + plasma bombardment The quantitative relationship between the defect density of graphene and the electron transfer rate constant was obtained by combining Raman spectroscopy with scanning electrochemical microscope The results show that the optimal defect density of 7.17 × 1012cm-2 can increase the electrochemical activity of graphene nearly 60 times This method provides a new way to control and optimize the electrochemical activity of other two-dimensional materials The first unit is Hunan University of science and technology Guo Jiayao and Chen forging, undergraduates, participated in part of the experimental work This work was supported by the National Natural Science Foundation of China (51605404) and the natural science foundation of Hunan Province (2018jj3142).