Design of an N-heterocyclic carbene-based mixed-ligand Co-MOF-derived CoV₂O₆/MoS₂-MoO₃@Co-S-NC architecture for highly-efficient supercapacitors and green H₂ evolution.

Authors

Chandra Mohan Andugula, Venkatathri Narayanan

Published in

Nanoscale. Oct 03, 2026. Epub Oct 03, 2026.

Abstract

The fabrication of a composite electrode using nitrogen-doped carbon and transition metal chalcogenides offers several benefits, including enhanced electrical conductivity, abundant active sites, and improved chemical durability. The abundant MoS₂-MoO₃ positively influences the stability of electrode materials used in supercapacitors and exhibits hydrogen evolution activity comparable to that of platinum. Consequently, it is considered an efficient alternative to Pt-based electrocatalysts. In this study, N-heterocyclic carbene-based Co-MOF-derived CoV₂O₆/MoS₂-MoO₃@Co-S/NC composites were synthesized using a simple one-step pyrolysis technique in which three precursors, thiourea, sodium molybdate, and CoV₂O₆/NHC-BTC-Co-MOF, were calcined under an N₂ gas flow at various temperatures. The resulting CoV₂O₆/MoS₂-MoO₃@Co-S/NC hybrids exhibit improved electrocatalytic activity towards the HER. The interaction between CoS₂ and MoS₂-MoO₃ significantly enhanced the catalytic performance for the HER; the hybrid composite demonstrated a low overpotential of 307 mV at a current density of 10 mA cm^-2 and a Tafel slope of 173.08 mV dec^-1 in 1 M KOH, outperforming Co-NHC (330 mV) and CoV₂O₆ (358 mV). The engineered electrode considerably enhances the number of redox-centres and results in a specific capacitance of 280.03 F g^-1 at 1 A g^-1. This material achieves an energy density (E_g) of 38.89 Wh kg^-1, a power density (P_d) of 500 W kg^-1, and a capacity retention of 71% after 2000 cycles at 8 A g^-1. The carbon-coated composite electrode exhibits a higher specific capacity of 310.37 F g^-1 at 1 A g^-1, an improved performance rate, and 52.2% durability after 2000 cycles at 6 A g^-1 over a wide voltage range (0 to 1.2 V). Furthermore, our symmetrical device exhibits a power density of 499.98 W kg^-1 and an energy density of 43.10 Wh kg^-1 at 1 A g^-1, highlighting its effectiveness for applications in long-term energy storage.

PMID:
42826994
Bibliographic data and abstract were imported from PubMed on 03 Oct 2026.

Read full publication at:
Please sign in to see all details.

Stats

1-terrible, 9-excellent. How would you rate this publication? Sign in in to submit your rating.

Post a comment

You need to be signed in to post comments. You can sign in here.

Comments

There are no comments yet.