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<p>Electrochemical synthesis of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) via two-electron oxygen reduction reaction (2e-ORR) offers a sustainable alternative to the anthraquinone process. Herein, a nanocomposite of carbon dots (CDs) and reduced carboxylic acid-functionalized graphene (rCA-G), denoted as CDs@rCA-G, was synthesized via a straightforward single pot hydrothermal method. The prepared CDs@rCA-G was characterized using physicochemical methods. The transmission electron microscopy pictures confirm that CDs are consistently distributed on the surface of graphene nanosheets. Powder X-ray diffraction data demonstrate the amorphous character of CDs and the graphitic structure of rCA-G, while the CDs@rCA-G composite exhibits characteristic peaks of both components, indicating successful integration. Fourier transform infra-red spectroscopy analysis reveals the existence of copious oxygen-carrying functionalities (–OH, carbonyl, and C–O) and confirms the integration of CDs onto the rCA-G framework. The synthesized CDs@rCA-G, employed as an electrocatalyst for oxygen reduction in alkaline condition, displays an onset potential of 0.79&#xa0;V (<i>vs.</i> RHE) and a half-wave potential of 0.67&#xa0;V (<i>vs.</i> RHE), while demonstrating ~ 85% selectivity toward the two-electron pathway for H<sub>2</sub>O<sub>2</sub> formation. The electron transfer number was computed as 2.1, indicating a dominant two-electron pathway, and the nanocomposite exhibits high stability, creating it a promising material for the long-term, trade-scale manufacture of H<sub>2</sub>O<sub>2</sub> through oxygen reduction.</p>

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Carbon dots and graphene nanocomposite as an electrocatalyst for selective two electron oxygen reduction to H2O2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月13日

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  • Pradeep Kumar Yadav,
  • Shalinee Dubey,
  • Vikram Rathour,
  • Sujeet Pandey,
  • Vellaichamy Ganesan

摘要

Electrochemical synthesis of hydrogen peroxide (H2O2) via two-electron oxygen reduction reaction (2e-ORR) offers a sustainable alternative to the anthraquinone process. Herein, a nanocomposite of carbon dots (CDs) and reduced carboxylic acid-functionalized graphene (rCA-G), denoted as CDs@rCA-G, was synthesized via a straightforward single pot hydrothermal method. The prepared CDs@rCA-G was characterized using physicochemical methods. The transmission electron microscopy pictures confirm that CDs are consistently distributed on the surface of graphene nanosheets. Powder X-ray diffraction data demonstrate the amorphous character of CDs and the graphitic structure of rCA-G, while the CDs@rCA-G composite exhibits characteristic peaks of both components, indicating successful integration. Fourier transform infra-red spectroscopy analysis reveals the existence of copious oxygen-carrying functionalities (–OH, carbonyl, and C–O) and confirms the integration of CDs onto the rCA-G framework. The synthesized CDs@rCA-G, employed as an electrocatalyst for oxygen reduction in alkaline condition, displays an onset potential of 0.79 V (vs. RHE) and a half-wave potential of 0.67 V (vs. RHE), while demonstrating ~ 85% selectivity toward the two-electron pathway for H2O2 formation. The electron transfer number was computed as 2.1, indicating a dominant two-electron pathway, and the nanocomposite exhibits high stability, creating it a promising material for the long-term, trade-scale manufacture of H2O2 through oxygen reduction.