Developing high-performance aqueous Zn-ion batteries from sustainable biomass becomes increasingly vital for large-scale energy storage in the foreseeable future.Therefore,γ-MnO_(2) uniformly loaded on N-doped carbon...Developing high-performance aqueous Zn-ion batteries from sustainable biomass becomes increasingly vital for large-scale energy storage in the foreseeable future.Therefore,γ-MnO_(2) uniformly loaded on N-doped carbon derived from grapefruit peel is successfully fabricated in this work,and particularly the composite cathode with carbon carrier quality percentage of 20 wt%delivers the specific capacity of 391.2 mAh g^(−1)at 0.1 A g^(−1),outstanding cyclic stability of 92.17%after 3000 cycles at 5 A g^(−1),and remarkable energy density of 553.12 Wh kg^(−1) together with superior coulombic efficiency of~100%.Additionally,the cathodic biosafety is further explored specifically through in vitro cell toxicity experiments,which verifies its tremendous potential in the application of clinical medicine.Besides,Zinc ion energy storage mechanism of the cathode is mainly discussed from the aspects of Jahn–Teller effect and Mn domains distribution combined with theoretical analysis and experimental data.Thus,a novel perspective of the conversion from biomass waste to biocompatible Mn-based cathode is successfully developed.展开更多
In this study,we successfully synthesized aδ-MnO_(2)cathode with O vacancies,encapsulated by C derived from pyromellitic acid,using a facile hydrothermal method followed by annealing in an Ar atmosphere.The cathode’...In this study,we successfully synthesized aδ-MnO_(2)cathode with O vacancies,encapsulated by C derived from pyromellitic acid,using a facile hydrothermal method followed by annealing in an Ar atmosphere.The cathode’s structural stability and charge transfer kinetics are enhanced by inhibiting the formation of the by-product Zn_(4)SO_(4)(OH)_(6)4H_(2)O,regulating the Mn valence state,and suppressing the Jahn–Teller effect through the synergy of C encapsulation and O vacancies.This results in remarkable electrochemical performance,including a large capacity of 421.2 mAh g^(-1)at 0.1 A g^(-1),a high specific energy density of595.53 Wh kg^(-1),and exceptional long-cycle life stability with 90.88%over 4000 cycles at 10 A g^(-1),together with superior coulombic efficiency(~100%)in pure ZnSO_(4)electrolyte.Moreover,the cathode materials demonstrate specific antitumor efficacy.In brief,this work introduces an in situ synthetic C encapsulatedδ-MnO_(2)with O vacancies expected to be applied in both large-scale energy storage and biomedicine.展开更多
基金supported by the National Natural Science Foundation of China[Grant no.51821004].
文摘Developing high-performance aqueous Zn-ion batteries from sustainable biomass becomes increasingly vital for large-scale energy storage in the foreseeable future.Therefore,γ-MnO_(2) uniformly loaded on N-doped carbon derived from grapefruit peel is successfully fabricated in this work,and particularly the composite cathode with carbon carrier quality percentage of 20 wt%delivers the specific capacity of 391.2 mAh g^(−1)at 0.1 A g^(−1),outstanding cyclic stability of 92.17%after 3000 cycles at 5 A g^(−1),and remarkable energy density of 553.12 Wh kg^(−1) together with superior coulombic efficiency of~100%.Additionally,the cathodic biosafety is further explored specifically through in vitro cell toxicity experiments,which verifies its tremendous potential in the application of clinical medicine.Besides,Zinc ion energy storage mechanism of the cathode is mainly discussed from the aspects of Jahn–Teller effect and Mn domains distribution combined with theoretical analysis and experimental data.Thus,a novel perspective of the conversion from biomass waste to biocompatible Mn-based cathode is successfully developed.
文摘In this study,we successfully synthesized aδ-MnO_(2)cathode with O vacancies,encapsulated by C derived from pyromellitic acid,using a facile hydrothermal method followed by annealing in an Ar atmosphere.The cathode’s structural stability and charge transfer kinetics are enhanced by inhibiting the formation of the by-product Zn_(4)SO_(4)(OH)_(6)4H_(2)O,regulating the Mn valence state,and suppressing the Jahn–Teller effect through the synergy of C encapsulation and O vacancies.This results in remarkable electrochemical performance,including a large capacity of 421.2 mAh g^(-1)at 0.1 A g^(-1),a high specific energy density of595.53 Wh kg^(-1),and exceptional long-cycle life stability with 90.88%over 4000 cycles at 10 A g^(-1),together with superior coulombic efficiency(~100%)in pure ZnSO_(4)electrolyte.Moreover,the cathode materials demonstrate specific antitumor efficacy.In brief,this work introduces an in situ synthetic C encapsulatedδ-MnO_(2)with O vacancies expected to be applied in both large-scale energy storage and biomedicine.
