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

IF 3.2 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2025-10-14 DOI:10.1007/s12678-025-00988-w

Muhammad Rizwan Shakir, Saima Rehman

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Abstract

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_onset and E_1/2 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

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还原氧化石墨烯负载的高分散CoP纳米颗粒作为氧还原反应的高效电催化剂

氧还原反应（ORR）由于在燃料电池和电池中的广泛应用而引起了科学界的广泛关注。最近，已经进行了几次尝试，以探索ORR的非贵金属电催化剂，以提高该工艺的商业可用性。本研究采用水热法在还原氧化石墨烯（CoP@rGO）上一锅简便地合成了磷化钴作为ORR电催化剂。合成的电催化剂的表征表明，在还原氧化石墨烯薄片上，CoP具有高的比表面积和均匀的分散。研究了催化剂对ORR的电化学性能，并与纯净的CoP和Pt/C（20%）进行了比较；采用旋转圆盘电极（RRDE）系统。结果表明，该催化剂具有良好的ORR性能，Eonset和E1/2分别为0.92 V和0.81 V。与CoP 117 mV/dec和Pt/C (20%) 71 mV/dec相比，Tafel斜率较小，为44.8 mV/dec，表明反应速度快，催化活性高。CoP@rGO对4电子途径下的ORR具有高选择性；平均电子转移数(n)为3.76，表明O2直接还原为H2O。在O2饱和的0.1 M KOH溶液中连续计时电流测试20000 s后，电催化剂的电流密度保持率达到95%，具有良好的操作稳定性。图形抽象

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

期刊介绍： Electrocatalysis is cross-disciplinary in nature, and attracts the interest of chemists, physicists, biochemists, surface and materials scientists, and engineers. Electrocatalysis provides the unique international forum solely dedicated to the exchange of novel ideas in electrocatalysis for academic, government, and industrial researchers. Quick publication of new results, concepts, and inventions made involving Electrocatalysis stimulates scientific discoveries and breakthroughs, promotes the scientific and engineering concepts that are critical to the development of novel electrochemical technologies. Electrocatalysis publishes original submissions in the form of letters, research papers, review articles, book reviews, and educational papers. Letters are preliminary reports that communicate new and important findings. Regular research papers are complete reports of new results, and their analysis and discussion. Review articles critically and constructively examine development in areas of electrocatalysis that are of broad interest and importance. Educational papers discuss important concepts whose understanding is vital to advances in theoretical and experimental aspects of electrochemical reactions.