Interfacial charge transport behavior and thermal profiles of vertically oriented graphene‐bridged supercapacitors (Phys. Status Solidi B 6/2017). Issue 6 (9th June 2017)

• Record Type: Journal Article
• Authors: Bo, Zheng; Wu, Shenghao; Qian, Jiajing; Pu, Haihui; Chen, Junhong; Yan, Jianhua; Cen, Kefa
• Is Part Of: Physica status solidi. Volume 254:Issue 6(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-06-09
• Subjects: Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.201770232
• Languages: English
• ISSNs: 0370-1972

Abstract

Abstract : Thermal generation induced by Joule heat is detrimental to the lifetime expectancy of a supercapacitor. Zheng Bo et al. (article no.1600804 ) investigated the interfacial charge transport behavior and the thermal profiles of vertically‐oriented graphene (VG) bridged supercapacitors, i.e., VGs as the electronic bridges connecting active materials and current collectors. Density functional theory (DFT) simulations, as well as the calculations based on a combination of DFT and non‐equilibrium Green's function (DFT‐NEGF), are conducted to explore the electronic density of states, electron distributions, formation energies, eigenchannels and electronic transmissions at the solid–solid interfaces of VG bridged supercapacitors. The equivalent series resistance, voltage drop and temperature rise during galvanostatic charging/discharging processes, are measured and compared between the supercapacitors fabricated with and without VG bridges. Results show that the addition of VG bridges can enhance the orbital interactions and the electronic conductivity at the solid–solid interfaces. This further results in the obvious reduction of both the contact resistance and Joule heat generation during the charging/discharging processes.