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    Renewable and sustainable green energy generation using Bi-functional TMOs decorated layered carbon nitride anchored on MXene for oxygen evolution reactions and urea oxidation reaction performance
    (2025-12-01)
    Vasu, Dhanapal
    ;
    Vittayakorn, Naratip
    ;
    Chang, Shih Hsien
    ;
    Lin, Kai Hsuan
    ;
    Chiu, Te Wei
    This article presents a comprehensive evaluation of a novel V<inf>2</inf>O<inf>5</inf>–graphitic carbon nitride (gCN)/MXene (Ti<inf>3</inf>C<inf>2</inf>Tx) composite (VGM) electrocatalyst, designed to enhance the oxygen evolution reaction (OER) and urea oxidation reaction (UOR). The VGM material was synthesized through a combination of hydrofluoric acid (HF) etching and thermal polymerization, offering a new approach for integrating transition metal oxides with 2D materials. Structural and surface analyses confirmed the successful formation of the hybrid catalyst with well-defined morphology and composition. Electrochemical studies revealed an impressively low overpotential of 151 mV and a Tafel slope of 95 mV/dec for OER, indicating excellent catalytic efficiency. The hybrid structure synergistically combines the high redox activity of V<inf>2</inf>O<inf>5</inf>, the large surface area of gCN, and the conductivity of MXene, leading to superior electrochemical performance. Additionally, the catalyst effectively drives the UOR, enabling simultaneous hydrogen generation and urea-rich wastewater remediation. This work introduces a cost-effective and multifunctional electrocatalyst design strategy, offering both energy and environmental benefits.
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    1T-Phase molybdenum sulfide/cobalt oxide nanopillars hybrid nanostructure coupled with nitrogen-doped carbon thin-film as high efficiency electrocatalyst for oxygen evolution
    (2022-02-15)
    Ying, Zi
    ;
    Lv, Yu
    ;
    Song, Haixiang
    ;
    Ma, Yujie
    ;
    Chen, Riming
    High efficient and durable catalysts are always needed to lower the kinetic barriers as well as prolong the service life associated with oxygen evolution reaction (OER). Herein, a sequential synthetic strategy is considered to prepare a hierarchical nanostructure, in which each component can be configured to achieve their full potential so that endows the resulting nanocatalyst a good overall performance. In order to realize this, well-organized cobalt oxide (Co<inf>3</inf>O<inf>4</inf>) nanopillars are firstly grown onto ultrathin 1T-molybdenum sulfide (1T-MoS<inf>2</inf>) to obtain high surface area electrocatalyst, providing electron transfer pathways and structural stability. After that, zeolitic imidazolate framework-67 (ZIF-67) derived carbonization film is further in situ deposited on the surface of nanopillars to generate plentiful active sites, thereby accelerating OER kinetics. Based on the combination of different components, the electron transfer capability, catalytic activity and durability are optimized and fully implemented. The obtained nanocatalyst (defined as 1T-MoS<inf>2</inf>/Co<inf>3</inf>O<inf>4</inf>/CN) exhibits the superior OER catalytic ability with the overpotential of 202 mV and Tafel slope of 57 mV·dec<sup>−1</sup> at 10 mA·cm<sup>−2</sup> in 0.1 M KOH, and good durability with a minor chronoamperometric decay of 9.15 % after 60,000 s of polarization.