Mesoporous vanadium nitride as anion storage electrode for reverse dual-ion hybrid supercapacitor

Chenglong Shi; Junlong Sun; Faqi Ji; Wenjun Chen; Youyong Pang; Bo-Tian Liu

doi:10.1016/j.isci.2022.104141

Mesoporous vanadium nitride as anion storage electrode for reverse dual-ion hybrid supercapacitor

iScience. 2022 Mar 23;25(4):104141. doi: 10.1016/j.isci.2022.104141. eCollection 2022 Apr 15.

Authors

Chenglong Shi¹, Junlong Sun¹, Faqi Ji¹, Wenjun Chen¹, Youyong Pang¹, Bo-Tian Liu^{1

2}

Affiliations

¹ Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Biological Engineering, Guilin University of Technology, Guilin 541004, China.
² Guangdong Institute of Semiconductor Industrial Technology, Guangdong Academy of Science, Guangzhou 510650, China.

Abstract

In traditional dual-ion systems, the cathode usually is employed as anion-storage materials. Herein, we propose a new dual-ion hybrid supercapacitor with reverse anion/cation-storage mechanism, consisting of a mesoporous (MPs) VN anode as a pivotal anion-storage material and K_2-xMn₈O₁₆ nanosheet arrays grown on carbon cloth (NSs/CC) as (K-storage) cathode. During charge/discharge, the anode and cathode reversibly store/release OH^- ions and K⁺ ions, respectively. Herein, the MPs VN as anion-storage electrode can operate in an alkaline condition and deliver a high capacitance of 251 mF cm^-2 with desired low-voltage plateau. More importantly, benefiting from unique reverse dual-ion mechanism, the (MPs VN-K_2-xMn₈O₁₆ NSs/CC) hybrid device displays excellent rate performance and satisfying area capacitance along with good durability of 92.2% after 10,000 cycles at a scan rate of 100 mV s^-1. It offers new ideas to expand the range of anion-storage materials in dual-ion hybrid supercapacitors.

Keywords: Electrochemistry; Energy application; Energy materials.