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To improve the energy efficiency and electrolyte utilization of vanadium redox flow batteries (VRFBs), this work systematically examines the electrochemical behavior of Co-CN/GF-modified graphite felts synthesized at varying temperatures (400, 500, 600 and 700 ℃) as cathode materials. The modified electrodes were characterized in terms of their morphology, crystal structure, and surface chemistry through scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Their electrochemical behavior was examined via cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge–discharge measurements to assess performance. The findings reveal that the processing temperature critically influences the electrode's surface morphology and catalytic activity. Notably, the Co-CN/GF electrode prepared at 500°C demonstrates superior electrocatalytic performance for the VO2+/VO2+ redox couple, attaining an average energy efficiency (EE) of 68.8% at a current density of 200 mA cm−2—an enhancement of 6.21% over untreated graphite felt. Furthermore, the battery's discharge capacity reaches 1.1567 Ah L−1, marking a 63.4% increase compared to the unmodified electrode. This research offers valuable guidance for optimizing thermal treatment conditions in the design of high-performance VRFB cathodes.

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MOF Derived Cobalt Oxide@Carbon Felt as High-Performance Electrode for All-Vanadium Redox Flow Batteries

  • 会议论文

  • 发表日期：

    2026年

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  • Guixiang Cai,
  • Hongmei Li,
  • Wei Li,
  • Jiongjiong Mao,
  • Zhisheng Nong,
  • Wei Lou,
  • Shaowei Lu

摘要

To improve the energy efficiency and electrolyte utilization of vanadium redox flow batteries (VRFBs), this work systematically examines the electrochemical behavior of Co-CN/GF-modified graphite felts synthesized at varying temperatures (400, 500, 600 and 700 ℃) as cathode materials. The modified electrodes were characterized in terms of their morphology, crystal structure, and surface chemistry through scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Their electrochemical behavior was examined via cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge–discharge measurements to assess performance. The findings reveal that the processing temperature critically influences the electrode's surface morphology and catalytic activity. Notably, the Co-CN/GF electrode prepared at 500°C demonstrates superior electrocatalytic performance for the VO2+/VO2+ redox couple, attaining an average energy efficiency (EE) of 68.8% at a current density of 200 mA cm−2—an enhancement of 6.21% over untreated graphite felt. Furthermore, the battery's discharge capacity reaches 1.1567 Ah L−1, marking a 63.4% increase compared to the unmodified electrode. This research offers valuable guidance for optimizing thermal treatment conditions in the design of high-performance VRFB cathodes.