Synergistic effect of K+and PANI in vanadium oxide hydration by interlayer engineering boosts the ammonium ion storage

Author:

Chen Xingyu1,Feng Ziying1,Dong Xueying1,Jiang Hanmei2,Meng Changgong1,Zhang Yifu1ORCID

Affiliation:

1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering Dalian University of Technology Dalian China

2. Department of Materials Science and Engineering National University of Singapore Singapore Singapore

Abstract

AbstractAqueous ammonium‐ion (NH4+) hybrid supercapacitor (AA‐HSC), as a new type of energy storage device with great potential, is in the initial stage of rapid development. Based on its special energy storage mechanism, exploiting novel NH4+‐hosting materials is still a great challenge. Herein, vanadium oxide hydration (VOH) tuned by interlayer engineering of K+/PANI co‐intercalation, named KVO/PANI, is designed for AA‐HSC. Intercalated PANI can shield interaction between NH4+and V–O layers to some extent and enlarge interlayer space, which improves the efficiency of reversible NH4+(de)insertion. However, K+enhances redox activity and electronic conductivity. The synergistic effect of co‐intercalation optimizes intercalation pseudocapacitive behavior during the (de)ammonization process, which is reported in NH4+storage for the first time. Theoretical calculations reveal that the lowered electron transport barrier and enhanced electronic conductivity improve NH4+kinetics and exhibit high capacitance for charge storage. The KVO/PANI can deliver the specific capacitance of 340 F g−1at 0.5 A g−1and retain 177 F g−1at 10 A g−1. Pairing with activated carbon, the AA‐HSC can achieve a decent energy density of 31.8 Wh kg−1. This work gives inorganic/organic co‐intercalation that can enhance the NH4+storage of VOH by interlayer engineering. The strategy can be used to design other materials for aqueous energy storage systems.

Publisher

Wiley

Subject

General Medicine

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