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<p>V<sub>2</sub>CT<sub>x</sub> exhibits remarkable potential for energy storage applications due to its high conductivity and pseudocapacitive behavior. However, oxidation rapidly degrades the structure and electrochemical characteristics, making them unstable in aqueous and atmospheric conditions. To reduce this occurrence, this study monitors the efficiency of sodium ascorbate (NaAsc) at different concentrations as an antioxidant to prevent the oxidation of V₂CTₓ MXene in both colloidal and film phases, while also proposing the optimal NaAsc concentration. The efficacy of the antioxidant was confirmed through both morphological and electrochemical techniques, including SEM, XRD, zeta potential, XPS, cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS). The results show that increasing NaAsc concentration maintains structural stability, supports electrochemical performance, and preserves the vanadium oxidation states. The optimal concentration of NaAsc was 200&#xa0;mg, demonstrating a 66% retention of specific capacitance and energy density. Higher concentrations lead to steric hindrance and reduced ionic accessibility. The protective mechanism was found to be a combination of edge-capping and chemical scavenging of oxidants by ascorbate ions, which helps prevent oxidation without significantly compromising electrochemical performance.</p>

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Role of NaAsc concentration in modifying the structural stability and electrochemical properties of two-dimensional vanadium carbide MXenes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月31日

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  • Ayomide Adeola Sijuade,
  • Nafiza Anjum,
  • Okenwa Okoli

摘要

V2CTx exhibits remarkable potential for energy storage applications due to its high conductivity and pseudocapacitive behavior. However, oxidation rapidly degrades the structure and electrochemical characteristics, making them unstable in aqueous and atmospheric conditions. To reduce this occurrence, this study monitors the efficiency of sodium ascorbate (NaAsc) at different concentrations as an antioxidant to prevent the oxidation of V₂CTₓ MXene in both colloidal and film phases, while also proposing the optimal NaAsc concentration. The efficacy of the antioxidant was confirmed through both morphological and electrochemical techniques, including SEM, XRD, zeta potential, XPS, cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS). The results show that increasing NaAsc concentration maintains structural stability, supports electrochemical performance, and preserves the vanadium oxidation states. The optimal concentration of NaAsc was 200 mg, demonstrating a 66% retention of specific capacitance and energy density. Higher concentrations lead to steric hindrance and reduced ionic accessibility. The protective mechanism was found to be a combination of edge-capping and chemical scavenging of oxidants by ascorbate ions, which helps prevent oxidation without significantly compromising electrochemical performance.