biostudies-literatureUnknown25(4)Shi CIn 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.iScience104141https://www.ebi.ac.uk/biostudies/studies/S-EPMC8980809biostudies-literatureMesoporous vanadium nitride as anion storage electrode for reverse dual-ion hybrid supercapacitor.PMC8980809Shi CJi FLiu BTChen WPang YSun JfalseMesoporous vanadium nitride as anion storage electrode for reverse dual-ion hybrid supercapacitor.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.2022-01-01T00:00:00Z2022 Apr2025-04-05T15:59:40.803Z2025-04-05T15:59:40.803ZS-EPMC89808093539182710.1016/j.isci.2022.104141