Rhodium-Modified Glassy Carbon Electrode as a Promising Electrocatalyst for Oxygen Reduction Reaction in Phosphoric Acid Electrolytes

IF 2.6 4区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

ChemNanoMat Pub Date : 2025-03-02 DOI:10.1002/cnma.202400468

S. M. Nizam Uddin, Abrar Yasir Abir, Mohammad Imran Hossain, Nahida Akter, Motasim Bin Islam, Kentaro Aoki, Yuki Nagao, Shrikant S. Maktedar, Mostafizur Rahaman, Mohammad Abul Hasnat

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Abstract

A low-cost glassy carbon electrode (GCE), modified with minimum amount of noble metal rhodium (Rh) via electrodeposition method can sensibly enhance the electrocatalytic oxygen reduction reaction (ORR) in H₃PO₄ solution (pH∼2.0). The successful Rh electrodeposition was confirmed by using field emission scanning electron microscopy (FE-SEM) and X-ray photoelectron microscopy (XPS). The rotating disk electrode (RDE) technique was used in kinetic investigation to confirm the ORR mechanism followed by the 4e⁻ transfer process, resulting in the production of water as the final product on the Rh-GCE surface. This finding was further supported by rotating ring disk electrode (RRDE) analysis. The transfer coefficient (α) value was determined ∼0.36, indicated the protonation and electron transfer process in the rate-limiting step of the ORR followed a concerted pathway. The exchange current density (j₀) and standard rate constant (k^o) were determined to be 1.09 × 10⁻⁴ A cm⁻² and 2.35 × 10⁻⁴ cm s⁻¹, respectively.

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铑修饰玻碳电极作为磷酸电解质中氧还原反应的一种有前景的电催化剂

在H3PO4溶液（pH ~ 2.0）中，通过电沉积法修饰少量贵金属铑（Rh）的低成本玻碳电极（GCE）可以显著增强电催化氧还原反应（ORR）。利用场发射扫描电镜（FE-SEM）和x射线光电子显微镜（XPS）证实了Rh电沉积的成功。采用旋转圆盘电极（RDE）技术进行动力学研究，证实了ORR机制之后的4e−转移过程导致最终产物在Rh-GCE表面上产生水。旋转环盘电极（RRDE）分析进一步支持了这一发现。传递系数（α）测定值为~ 0.36，表明在ORR的限速步骤中质子化和电子转移过程是协调一致的。交换电流密度（j0）和标准速率常数（ko）分别为1.09 × 10−4 A cm−2和2.35 × 10−4 cm s−1。

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来源期刊

ChemNanoMat Energy-Energy Engineering and Power Technology

CiteScore

6.10

自引率

2.60%

发文量

236

期刊介绍： ChemNanoMat is a new journal published in close cooperation with the teams of Angewandte Chemie and Advanced Materials, and is the new sister journal to Chemistry—An Asian Journal.