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<p>Oxygen reduction reaction (ORR) has attracted great deal of scientific attention owing to its enormous applications in fuel cells and batteries. Recently, several attempts have been made to explore non-precious metal based electrocatalysts for ORR to enhance the commercial availability of the process. This study presents one pot facile synthesis of cobalt phosphide supported on reduced graphene oxide (CoP@rGO) via hydrothermal process for application as electrocatalyst for ORR. Characterization of synthesized electrocatalyst revealed high surface area and homogeneous dispersion of CoP over the rGO sheets. The electrochemical properties of the catalyst towards ORR were studied in comparison to pristine CoP and Pt/C (20%); by using rotating disc electrode (RRDE) system. The catalyst was found to have excellent ORR performance with E<sub>onset</sub> and E<sub>1/2</sub> of 0.92&#xa0;V and 0.81&#xa0;V vs RHE, respectively. The smaller values of Tafel slope i.e. 44.8&#xa0;mV/dec as compared to CoP 117&#xa0;mV/dec and Pt/C (20%) 71&#xa0;mV/dec, suggested fast reaction kinetics with significantly high catalytic activity. CoP@rGO showed high selectivity for ORR following 4 electron pathway; with average electron transfer number (<i>n</i>) of 3.76, which suggest direct reduction of O<sub>2</sub> to H<sub>2</sub>O. Moreover, excellent operational stability of electrocatalyst was observed via current density retention ~ 95% in O<sub>2</sub> saturated 0.1&#xa0;M KOH solution after continuous chronoamperometric testing for 20000&#xa0;s.</p> Graphical Abstract <p></p>

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Highly Dispersed CoP Nanoparticles Supported on Reduced Graphene Oxide as Efficient Electrocatalyst for Oxygen Reduction Reaction

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Muhammad Rizwan Shakir,
  • Saima Rehman

摘要

Oxygen reduction reaction (ORR) has attracted great deal of scientific attention owing to its enormous applications in fuel cells and batteries. Recently, several attempts have been made to explore non-precious metal based electrocatalysts for ORR to enhance the commercial availability of the process. This study presents one pot facile synthesis of cobalt phosphide supported on reduced graphene oxide (CoP@rGO) via hydrothermal process for application as electrocatalyst for ORR. Characterization of synthesized electrocatalyst revealed high surface area and homogeneous dispersion of CoP over the rGO sheets. The electrochemical properties of the catalyst towards ORR were studied in comparison to pristine CoP and Pt/C (20%); by using rotating disc electrode (RRDE) system. The catalyst was found to have excellent ORR performance with Eonset and E1/2 of 0.92 V and 0.81 V vs RHE, respectively. The smaller values of Tafel slope i.e. 44.8 mV/dec as compared to CoP 117 mV/dec and Pt/C (20%) 71 mV/dec, suggested fast reaction kinetics with significantly high catalytic activity. CoP@rGO showed high selectivity for ORR following 4 electron pathway; with average electron transfer number (n) of 3.76, which suggest direct reduction of O2 to H2O. Moreover, excellent operational stability of electrocatalyst was observed via current density retention ~ 95% in O2 saturated 0.1 M KOH solution after continuous chronoamperometric testing for 20000 s.

Graphical Abstract