Tailoring NH4+ storage by regulating oxygen defect in ammonium vanadate

扫码查看

原文链接

NETL
NSTL
万方数据

外文摘要：Defect engineering is an effective strategy for modifying the energy storage materials to improve their electrochemical performance.However,the impact of oxygen defect and its content on the electrochemical performances in the burgeoning aqueous NH4+storage field remains explored.Therefore,for the first time in this work,an oxygen-defective ammonium vanadate[(NH4)2V10O25·8H2O,denoted as Od-NHVO]with a novel 3D porous flower-like architecture was achieved via the reduction of thiourea in a mild reaction condition,which is a facile method that can realize the intention to regulate the oxygen defect content,with the capability of mass-production.The as-prepared OdM-NHVO with moderate oxygen defect content can deliver a stable specific capacitance output(505 F g-1,252 mAh g-1 at 0.5 A g-1 with～80%capacitance retention after 10,000 cycles),which benefits from extra active sites,unimpeded NH4+-migration path and relatively high structure integrity.In contrast,low oxygen defect content will lead to the torpid electrochemical reaction kinetics while too high content of it will reduce the charge-storage capability and induce structural disintegration.The superior NH4+-storage behavior is achieved with the reversible intercalation/de-intercalation process of NH4+accompanied by forming/breaking of hydrogen bond.As expected,the assembled flexible OdM-NHVO//PTCDI quasi-solid-state hybrid supercapacitor(FQSS HSC)also exhibits high areal capacitance,energy density and reliable flexibility.This work provides a new avenue for developing materials with oxygen-deficient structure for application in various aqueous non-metal cation storage systems.

外文关键词：

Ammonium vanadateOxygen defectAmmonium-ion storageHybrid supercapacitorsElectrochemical performance

作者：

Yanyan Liu、Ziyi Feng、Hanmei Jiang、Xueying Dong、Changgong Meng、Yifu Zhang

展开 >

作者单位：

State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian,116024,China

College of Environmental and Chemical Engineering,Dalian University,Dalian,116622,China

基金：

Large Instrument and Equipment Open Foundation of Dalian University of Technology and Fundamental Research Funds for the Cen

项目编号：

DUT21LK34

出版年：

2024

DOI：

10.1016/j.gee.2023.02.001

绿色能源与环境(英文)

CSTPCD

ISSN：

年,卷(期)：2024.9(7)