Influence of Diffusion Field Alterations on Reactant and Intermediate Adsorption in Oxygen Reduction Pathways

IF 24.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Advanced Energy Materials Pub Date : 2025-04-15 DOI:10.1002/aenm.202500558

Guangxing Yang, Jie Chen, Jiahui Chen, Dongqin Liu, Jiayu Yuan, Zenan Wu, Zhiting Liu, Qiao Zhang, Hao Yu, Feng Peng

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Abstract

The oxygen reduction reaction (ORR) on platinum (Pt) electrodes in acidic electrolytes can occur via two pathways, with the four‐electron pathway typically dominating. While much of the existing literature has focused on structure‐activity relationships to explain the switching between these pathways, the influence of mesoscopic mass transport—specifically related to modifications in the diffusion field—has received limited attention. In this study, the loading of Pt nanoparticles is systematically varied to create materials with comparable physicochemical properties but differing interparticle distances (IPD). Electrochemical impedance spectroscopy revealed that modifications in interparticle distance significantly alter the O2 diffusion field, which subsequently impacts the adsorption of H2O2 and dictates the reaction pathways. Notably, increasing the IPD from 58.6 to 117.0 nm led to a substantial increase in H2O2 selectivity in acidic conditions, rising from 4.6 to 81.5%. The findings highlight the pivotal role of diffusion field modifications in influencing reactant and intermediate adsorption, thereby shaping the mechanisms of electrocatalysis.

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来源期刊

Advanced Energy Materials CHEMISTRY, PHYSICAL-ENERGY & FUELS

CiteScore

41.90

自引率

4.00%

发文量

889

审稿时长

1.4 months

期刊介绍： Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small. With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics. The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.