In pursuit of high-performance supercapacitors(SCs)with exceptional electrochemical capacitive pro perties,the logical design of sophisticated architectures composed of multiple modules presents a crucial challenge.He...In pursuit of high-performance supercapacitors(SCs)with exceptional electrochemical capacitive pro perties,the logical design of sophisticated architectures composed of multiple modules presents a crucial challenge.Herein,a facile in situ“growth–conversion–oxidation”route is designed to obtain a core–shell structured nanorod-like CoO@NiCo layered double hydroxide(LDH)with abundant oxygen vacancies on a Ni foam substrate(NCLO)for high performance supercapacitors.Density functional theory(DFT)-based computations reveal that NCLO has an enhanced density of states(DOS)in the vicinity of the Fermi energy level suggesting an increased electrical conductivity attributed to the existence of oxygen vacancies in NCLO.Notably,NCLO displays an impressive specific capacitance of 333.3 mA h g^(−1)(2264.2 Fg^(−1)at 1 A g^(−1)).Furthermore,the NCLO//AC asymmetric supercapacitor(ASC)device exhibits an out standing capacity retention rate of 90.8%following 10000 cycles and a remarkable energy density reach ing up to 63.8 W h kg^(−1)at 800.0 W kg^(−1).Our work highlights the feasibility of utilizing vacancy engineer ing and distinctive structural features as an innovative strategy for achieving energy storage materials with an extraordinary performance.展开更多
基金supported by the Doctoral Start-up Foundation of Liaoning Province(2020-BS-237,2022-BS-300)the Key Project of Education Department of Liaoning Province of China(LJKZ1010)+1 种基金the General Cultivation of Scientific Research Projects of Bohai University(0522xn042)the Doctoral Start-up Foundation of Bohai University(0520bs045).
文摘In pursuit of high-performance supercapacitors(SCs)with exceptional electrochemical capacitive pro perties,the logical design of sophisticated architectures composed of multiple modules presents a crucial challenge.Herein,a facile in situ“growth–conversion–oxidation”route is designed to obtain a core–shell structured nanorod-like CoO@NiCo layered double hydroxide(LDH)with abundant oxygen vacancies on a Ni foam substrate(NCLO)for high performance supercapacitors.Density functional theory(DFT)-based computations reveal that NCLO has an enhanced density of states(DOS)in the vicinity of the Fermi energy level suggesting an increased electrical conductivity attributed to the existence of oxygen vacancies in NCLO.Notably,NCLO displays an impressive specific capacitance of 333.3 mA h g^(−1)(2264.2 Fg^(−1)at 1 A g^(−1)).Furthermore,the NCLO//AC asymmetric supercapacitor(ASC)device exhibits an out standing capacity retention rate of 90.8%following 10000 cycles and a remarkable energy density reach ing up to 63.8 W h kg^(−1)at 800.0 W kg^(−1).Our work highlights the feasibility of utilizing vacancy engineer ing and distinctive structural features as an innovative strategy for achieving energy storage materials with an extraordinary performance.
