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Author: search.filters.author.Chiu, Te WeiSubject: search.filters.subject.OER

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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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    Boosting sustainable hydrogen production via water splitting and urea oxidation using spinel hollow-sphere nano catalysts
    (2025-10-01)
    Lin, Hsin Yu
    ;
    Vasu, Dhanapal
    ;
    Tsang, Chun Han
    ;
    Hsu, Cheng Shan
    ;
    Prashanth, Gopi
    In this study, spinel MgCo<inf>2</inf>O<inf>4</inf> materials were synthesized using three different techniques: freeze-drying, solid-state, and hydrothermal methods, to evaluate their structural, morphological, and electrocatalytic properties. Comprehensive characterization techniques including XRD, Raman spectroscopy, FT-IR, FESEM, HRTEM, and XPS confirmed the successful formation of phase-pure MgCo<inf>2</inf>O<inf>4</inf> with varied morphologies. Among the synthesized materials, the freeze-dried sample exhibited a well-defined hollow-sphere structure, providing abundant electroactive sites and superior electron/mass transport pathways. This morphology contributed to outstanding electrocatalytic performance. For the oxygen evolution reaction (OER), the hollow-sphere MgCo<inf>2</inf>O<inf>4</inf> catalyst demonstrated a low overpotential of 430 mV at 10 mA cm<sup>−2</sup> and a Tafel slope of 190 mV dec<sup>−1</sup>. In addition, the same catalyst exhibited excellent activity for the urea oxidation reaction (UOR), with a Tafel slope of 95 mV dec<sup>−1</sup> and enhanced current density under alkaline conditions. The superior UOR activity, enabled by the lower oxidation potential of urea (∼0.37 V vs. RHE), also highlights its potential for energy-efficient hydrogen production and wastewater treatment. This work establishes a scalable and cost-effective strategy to synthesize high-performance MgCo<inf>2</inf>O<inf>4</inf> hollow-sphere electrocatalysts, paving the way for their application in sustainable energy and environmental technologies.