Polypyrrole(PPy)is a very promising pseudocapacitive electrode material for supercapacitors.However,the poor electrochemical performances and cycling stability caused by volumetric change and counterion drain severely...Polypyrrole(PPy)is a very promising pseudocapacitive electrode material for supercapacitors.However,the poor electrochemical performances and cycling stability caused by volumetric change and counterion drain severely limited its practical application and commercialization.Herein,we present a pulsepotential polymerization strategy for uniformly depositing a dual-doped PPy with ordered and shorter molecular structure by balancing the concentration polarization.Such a strategy ensures more homogeneous stress distribution of PPy during ultralong cycling tests and improves the cycle stability.Moreover,the pulse-potential polymerized PPy with dual anion doping behavior induces enhanced protonation level and improved electrical conductivity,which boosting the charge transfer kinetics.Therefore,the as-synthesized PPy exhibits a remarkable capacitance performance(7250 mF/cm^(2)@3 mA/cm^(2)),outstanding rate capability(3073 mF/cm^(2)@200 mA/cm^(2))and a long cycle life.The assembled symmetric and asymmetric supercapacitors(ASC)exhibit good energy densities(0.8 mWh/cm^(2) for ASC and 0.5 mWh/cm^(2) for symmetric supercapacitor),and excellent durability with zero capacitive loss after 35,000 cycles.In addition,we have fabricated small pouch devices,which can effectively operate a variety of electronic products(including the high-voltage 5 V smartphone,and tablet)and well withstand the external extreme tests during operation,demonstrating the quantitative investigation of the real-life application of aqueous supercapacitors.展开更多
基金National Natural Science Foundation of China,Grant/Award Number:52071171。
文摘Polypyrrole(PPy)is a very promising pseudocapacitive electrode material for supercapacitors.However,the poor electrochemical performances and cycling stability caused by volumetric change and counterion drain severely limited its practical application and commercialization.Herein,we present a pulsepotential polymerization strategy for uniformly depositing a dual-doped PPy with ordered and shorter molecular structure by balancing the concentration polarization.Such a strategy ensures more homogeneous stress distribution of PPy during ultralong cycling tests and improves the cycle stability.Moreover,the pulse-potential polymerized PPy with dual anion doping behavior induces enhanced protonation level and improved electrical conductivity,which boosting the charge transfer kinetics.Therefore,the as-synthesized PPy exhibits a remarkable capacitance performance(7250 mF/cm^(2)@3 mA/cm^(2)),outstanding rate capability(3073 mF/cm^(2)@200 mA/cm^(2))and a long cycle life.The assembled symmetric and asymmetric supercapacitors(ASC)exhibit good energy densities(0.8 mWh/cm^(2) for ASC and 0.5 mWh/cm^(2) for symmetric supercapacitor),and excellent durability with zero capacitive loss after 35,000 cycles.In addition,we have fabricated small pouch devices,which can effectively operate a variety of electronic products(including the high-voltage 5 V smartphone,and tablet)and well withstand the external extreme tests during operation,demonstrating the quantitative investigation of the real-life application of aqueous supercapacitors.
