Nonmetal (S or Se)‐Bridged Core Shell Electrodes for Promoting Electrochemical Performance. Issue 20 (11th April 2022)

• Record Type: Journal Article
• Authors: Wang, Jiawei; Sun, Mingshuai; Zhang, Xubin; Wang, Fumin; Song, Jian; Zhang, Weike; Wang, Zheng; Li, Mingzhao
• Is Part Of: Advanced energy materials. Volume 12:Issue 20(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-11
• Subjects: core‐shell electrodes -- Prussian blue analogs -- supercapacitors; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202200777
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: To meet strategic applications, rational design of advanced electrochemical materials would solve the poor electrochemical performance of core‐shell electrodes caused by the weak interfacial interaction between core and shell. Herein, two novel core‐shell electrodes LCCH‐S@PBAs and LCCH‐Se@PBAs are fabricated with a nonmetal (S or Se) bridging the core and shell. Electrochemical tests show that the as‐synthesized electrodes, especially LCCH‐S@PBAs, present higher mass‐specific capacitance with 10.1 C cm −2 at 1 mA cm −2, which is much better than that of PBA‐based homologs. Experimental results and theoretical calculations show that the bridging S or Se in the interface, not only tune electronic nature of the d‐states of metal ions in core and shell, but also form ionic bonds (M1 (LCCH)‐S‐M2 (PBAs) and M1 (LCCH)‐Se‐M2 (PBAs)) which facilitates the transmission of electrons, thus making a substantial enhancement of electrochemical performance via a dynamically more favorable pathway. The comparison with LCCH‐C@PBAs, in which the rGO is connected with core and shell by Van der Waals' forces, also suggests the outstanding role of ionic bonds for electrochemical performance. This work proves that nonmetal bridging structures make a great contribution for enhanced electrochemical performance and demonstrates the large space to modulate the nonmetal bridging status for core‐shell structures in electrochemical materials. Abstract : Novel nonmetal‐bridged core shell electrodes are fabricated to solve the issue of poor electrochemical performance caused by weak interfacial interaction between core and shell. The bridging nonmetals in the interface, not only tune the binding energy of metal ions in core and shell, but also form strong ionic bonds thus facilitating the transmission of electrons.