Gamma Radiolysis-Synthesized Carbon Nanotube–Supported Palladium as Electrocatalyst for Oxygen Reduction Reaction

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2022-12-26 DOI:10.1007/s12678-022-00807-6

Thye-Foo Choo, Nurazila Mat Zali, Nur Ubaidah Saidin, Kuan-Ying Kok

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引用次数: 1

Abstract

Electrocatalysts are used to promote efficient energy conversion in fuel cell, especially for the sluggish oxygen reduction reaction (ORR) at the cathode that inhibits the performance of the device. In this work, we demonstrate the use of a facile gamma radiolysis technique to synthesize carbon nanotube-supported palladium (Pd) metal particles as electrocatalysts for the ORR application. The Pd precursor concentration used in the preparation process was found to contribute greater effects on the Pd content and Pd crystallite size of the synthesized product compared to the gamma irradiation dose. The results showed that gamma radiolysis could successfully reduce Pd ions from its precursor solution as evidenced from field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) characterization. The optimal ORR electrocatalyst was prepared using 0.01-M Pd precursor and a gamma radiation dose of 50 kGy. It displays a high half-wave potential (E_1/2) of 0.84 V (vs. RHE) and superior electron transfer number (n) of 3.96, as well as a low peroxide yield of 1.8%. This impressive ORR electrocatalytic performance was also attributed to the synergistic effect of Pd metal particles with CNT. The findings showed that Pd/CNT is a promising electrocatalyst for ORR application and that gamma radiolysis provides a facile and eco-friendly approach in synthesizing electrocatalysts.

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γ射线裂解-合成碳纳米管负载钯作为氧还原反应的电催化剂

电催化剂被用于提高燃料电池的能量转换效率，特别是在阴极上缓慢的氧还原反应(ORR)抑制了设备的性能。在这项工作中，我们展示了使用一种简单的伽马辐射分解技术来合成碳纳米管负载的钯(Pd)金属颗粒作为ORR应用的电催化剂。与γ辐照剂量相比，制备过程中使用的Pd前驱体浓度对合成产物的Pd含量和Pd晶粒尺寸的影响更大。结果表明，从场发射扫描电镜(FESEM)、能量色散x射线能谱(EDS)和x射线衍射(XRD)表征中可以看出，γ射线裂解可以成功地从前驱体溶液中还原Pd离子。以0.01 m Pd为前驱体，γ辐射剂量为50 kGy，制备了最佳的ORR电催化剂。它具有0.84 V(相对于RHE)的高半波电位(E1/2)和3.96的优越电子转移数(n)，以及1.8%的低过氧化物收率。这种令人印象深刻的ORR电催化性能也归功于钯金属颗粒与碳纳米管的协同效应。研究结果表明，Pd/CNT是一种很有前途的ORR电催化剂，而伽马射线裂解为电催化剂的合成提供了一种简便、环保的方法。

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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.