The ever-increasing obligation of green and sustainable energy has intensified rigorous research on improving efficient electrochemical energy transition and storage systems.Herein,CoS_(2)prickly-pear-like sheet-inter...The ever-increasing obligation of green and sustainable energy has intensified rigorous research on improving efficient electrochemical energy transition and storage systems.Herein,CoS_(2)prickly-pear-like sheet-intermingled metal carbide(Mo_(2)C and W_(2)C)hybrids were synthesized using a facile hydrothermal method.The fabricated hierarchical CoS_(2)-W_(2)C and CoS_(2)-Mo_(2)C hybrid structures were explored for their pseudo-capacitive behaviour by half-cell studies with specific capacities of 720 and 380 C g^(−1)at 2 A g^(−1),respectively,with great cycling stability.The synthesized CoS_(2)-W_(2)C and CoS_(2)-Mo_(2)C hybrid asymmetric supercapacitors demonstrated an elevated specific capacitance,reaching 423 F g^(−1)at a current density of 2 A g^(−1)within an extended voltage range of 1.6 V.Additionally,the highest energy density of 150 W h kg^(−1)was achieved at a maximum power density of 4.5 kW kg^(−1)along with a superior capacitance retention of 94.1%after 5000 cycles.As hydrogen evolution catalysts,the CoS_(2)-W_(2)C hybrid required small overpotentials of 50 and 42 mV,whereas the CoS_(2)-Mo_(2)C hybrid required 54 and 50 mV to deliver 10 mA cm^(−2)current density in acid and KOH solution,respectively.This study related to metal carbide-interconnected metal sulfide provides a promising opportunity for the fabrication/design and application of multifunctional electrocatalysts.展开更多
基金supported by the Mid-career Researcher Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science and ICT(No.2019R1A2C2086747).
文摘The ever-increasing obligation of green and sustainable energy has intensified rigorous research on improving efficient electrochemical energy transition and storage systems.Herein,CoS_(2)prickly-pear-like sheet-intermingled metal carbide(Mo_(2)C and W_(2)C)hybrids were synthesized using a facile hydrothermal method.The fabricated hierarchical CoS_(2)-W_(2)C and CoS_(2)-Mo_(2)C hybrid structures were explored for their pseudo-capacitive behaviour by half-cell studies with specific capacities of 720 and 380 C g^(−1)at 2 A g^(−1),respectively,with great cycling stability.The synthesized CoS_(2)-W_(2)C and CoS_(2)-Mo_(2)C hybrid asymmetric supercapacitors demonstrated an elevated specific capacitance,reaching 423 F g^(−1)at a current density of 2 A g^(−1)within an extended voltage range of 1.6 V.Additionally,the highest energy density of 150 W h kg^(−1)was achieved at a maximum power density of 4.5 kW kg^(−1)along with a superior capacitance retention of 94.1%after 5000 cycles.As hydrogen evolution catalysts,the CoS_(2)-W_(2)C hybrid required small overpotentials of 50 and 42 mV,whereas the CoS_(2)-Mo_(2)C hybrid required 54 and 50 mV to deliver 10 mA cm^(−2)current density in acid and KOH solution,respectively.This study related to metal carbide-interconnected metal sulfide provides a promising opportunity for the fabrication/design and application of multifunctional electrocatalysts.
