Synergic <scp> MnMo ₂ S ₄ </scp> and Multiwalled Carbon Nanotube Architectures: A Dual‐Function Electrocatalyst and Energy‐Storage Material

ABSTRACT This investigation explores the electrochemical behaviors of the Multiwalled Carbon Nanotubes (MWCNT) supported MnMo 2 S 4 electrocatalyst synthesized via hydrothermal method. The compound's phase MnMo 2 S 4 is confirmed by the XRD spectrum. The MnMo 2 S 4 structural ornamentation on the MWCNT is shown by the SEM and TEM morphological investigation. BET and XPS inquisitions are employed to retrieve the nanohybrid's specific surface area and oxidation states, respectively. By demonstrating an overpotential of 126 mV at a current density of 10 mA cm −2 , the MnMo 2 S 4 /MWCNT composite exposes its synergistic action toward restored HER activity. Also, the nanohybrid exhibits a specific capacitance of 1166.4 Fg −1 at 2 Ag −1 current density, revealing its remarkable energy storage capability. Additionally, the MnMo 2 S 4 /MWCNT//MWCNT as‐erected asymmetric supercapacitor device registers 95 F g −1 @2 A g −1 , redeems an energy density of about 33.33 Wh kg −1 at a specific power of 1066.56 W kg −1 , and retains approximately 90.7% of its initial capacitance after 3000 consecutive cycles. These prosperous outcomes, owing to the enhanced surface area with promoted active sites and improved electrode‐electrolyte interface kinetics, proclaim MnMo 2 S 4 /MWCNT as an impressive catalyst for hydrogen production and energy storage systems.