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<p>The overuse of fossil fuels has led to their degradation, encouraging the search for alternative energy sources that are abundant, affordable, and environmentally friendly. Many researchers are exploring water splitting as an effective method for producing green energy to address this challenge. In this report, we present the electrocatalytic properties of a cost-effective carbon-metal composite derived from biomass and synthesized at 750&#xa0;°C using cobalt (Co) and molybdenum (Mo) precursors for the hydrogen evolution reaction (HER) in alkaline electrolytes at various pH levels. Physical characterizations, including X-ray diffraction (XRD), Raman spectroscopy, and field-emission scanning electron microscopy (FE-SEM), confirm the formation of a nanoporous carbon-metal composite (MOCoC/750, where MO represents molybdenum oxide, and Co is cobalt, both anchored to carbon catalyst C). Electrochemical characterization demonstrates the impact of different alkaline pH levels (8.2, 9.5, 11.2, 12.6, and 14) on the electrocatalytic HER activity of MOCoC/750. For HER, the as-synthesized catalyst requires a low overpotential of -0.172&#xa0;V to achieve the benchmark current density of -10&#xa0;mA/cm² in an electrolyte at pH 14. In contrast, it requires an overpotential of -0.400&#xa0;V to achieve the same current density in a near-neutral electrolyte (pH 8.2), making it a highly effective catalyst compared to others in similar conditions.</p>

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Efficient hydrogen evolution of a low-cost novel green chickpea shell-derived carbon-metal composite in alkaline electrolytes

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • Tasneem M. A. Khan,
  • Pradip B. Sarawade

摘要

The overuse of fossil fuels has led to their degradation, encouraging the search for alternative energy sources that are abundant, affordable, and environmentally friendly. Many researchers are exploring water splitting as an effective method for producing green energy to address this challenge. In this report, we present the electrocatalytic properties of a cost-effective carbon-metal composite derived from biomass and synthesized at 750 °C using cobalt (Co) and molybdenum (Mo) precursors for the hydrogen evolution reaction (HER) in alkaline electrolytes at various pH levels. Physical characterizations, including X-ray diffraction (XRD), Raman spectroscopy, and field-emission scanning electron microscopy (FE-SEM), confirm the formation of a nanoporous carbon-metal composite (MOCoC/750, where MO represents molybdenum oxide, and Co is cobalt, both anchored to carbon catalyst C). Electrochemical characterization demonstrates the impact of different alkaline pH levels (8.2, 9.5, 11.2, 12.6, and 14) on the electrocatalytic HER activity of MOCoC/750. For HER, the as-synthesized catalyst requires a low overpotential of -0.172 V to achieve the benchmark current density of -10 mA/cm² in an electrolyte at pH 14. In contrast, it requires an overpotential of -0.400 V to achieve the same current density in a near-neutral electrolyte (pH 8.2), making it a highly effective catalyst compared to others in similar conditions.