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

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.

SUBMITTER: Shi C 

PROVIDER: S-EPMC8980809 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature