Aqueous ammonium batteries(AAIBs)gain extensive attention because of their merits,such as costeffectiveness,eco-friendliness,and safety.Nevertheless,the limited research on electrode materials impedes their further de...Aqueous ammonium batteries(AAIBs)gain extensive attention because of their merits,such as costeffectiveness,eco-friendliness,and safety.Nevertheless,the limited research on electrode materials impedes their further development.Here,we prepare Cu_(x)O(x=1,2)materials and apply them as cathode materials for AAIBs.The electrodes have a high discharge-specific capacity and a long and stable charge-discharge plateau.In accordance with density functional theory,the mechanism of NH_(4)^(+)storage involves the reversible formation and breaking of hydrogen bonds.Simultaneously,CuO contributes additional electrons and facilitates the rearrangement of internal electrons,thereby enhancing the storage performance of NH_(4)^(+).To further improve the chemical reaction kinetics and address the limited cycle stability of CuO,a compositematerial composed of CuO and carbon(CuO/C)is developed.The findings demonstrate that CuO/C exhibits superior rate capability,with an initial discharge-specific capacity reaching 1851 mAh g^(-1)(0.1 A g^(-1))and improved reversible cycle performance(113 mAh g^(-1)after 400cycles).This study investigates the application of CuO as the cathode material in AAIBs and presents new opportunities for future industrial development.展开更多
基金financially supported by the National Natural Scientific Foundation of China(Nos.52371211 and 52171200)Changsha Special Project(No.kh2301006)the Natural Science Foundation of Shandong Province(No.ZR2024QB185)
文摘Aqueous ammonium batteries(AAIBs)gain extensive attention because of their merits,such as costeffectiveness,eco-friendliness,and safety.Nevertheless,the limited research on electrode materials impedes their further development.Here,we prepare Cu_(x)O(x=1,2)materials and apply them as cathode materials for AAIBs.The electrodes have a high discharge-specific capacity and a long and stable charge-discharge plateau.In accordance with density functional theory,the mechanism of NH_(4)^(+)storage involves the reversible formation and breaking of hydrogen bonds.Simultaneously,CuO contributes additional electrons and facilitates the rearrangement of internal electrons,thereby enhancing the storage performance of NH_(4)^(+).To further improve the chemical reaction kinetics and address the limited cycle stability of CuO,a compositematerial composed of CuO and carbon(CuO/C)is developed.The findings demonstrate that CuO/C exhibits superior rate capability,with an initial discharge-specific capacity reaching 1851 mAh g^(-1)(0.1 A g^(-1))and improved reversible cycle performance(113 mAh g^(-1)after 400cycles).This study investigates the application of CuO as the cathode material in AAIBs and presents new opportunities for future industrial development.
