Designing CoS2-Mo2C and CoS2-W2C hybrids for high-performance supercapacitors and hydrogen evolution reactions

Sajjad Hussain, Sikandar Aftab, Zeesham Abbas, Iftikhar Hussain, Shoyebmohamad F. Shaikh, K. Karuppasamy, Hyun Seok Kim, Jongwan Jung, Dhanasekaran Vikraman

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The ever-increasing obligation of green and sustainable energy has intensified rigorous research on improving efficient electrochemical energy transition and storage systems. Herein, CoS2 prickly-pear-like sheet-intermingled metal carbide (Mo2C and W2C) hybrids were synthesized using a facile hydrothermal method. The fabricated hierarchical CoS2-W2C and CoS2-Mo2C 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 CoS2-W2C and CoS2-Mo2C 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 CoS2-W2C hybrid required small overpotentials of 50 and 42 mV, whereas the CoS2-Mo2C 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.

    Original languageBritish English
    Pages (from-to)4001-4018
    Number of pages18
    JournalInorganic Chemistry Frontiers
    Volume11
    Issue number13
    DOIs
    StatePublished - 20 May 2024

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