From Structure to Power: Monolithic Carbon Air Cathodes with an Optimized Active Distribution for Direct-Formate Fuel Cells

IF 3.7 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2025-02-20 DOI:10.1021/acs.langmuir.4c04711

Yudong Zhang, Menghan Liang, Wei Yang, Min Du, Shaojian Han, Xiaojie Li, Xiaorui Dong

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Abstract

Non-noble metal cathodes often suffer from limited oxygen reduction reaction (ORR) activity due to poor mass transport and insufficient active site availability, which restricts their application. This study presents a carbon-based air cathode featuring a monolithic, binder-free design aimed at enhancing the mass transfer and distribution of active sites. Characterization results indicate that the carbon-based monolithic air cathodes with a thickness of 1.5 mm (Fe@AC-1.5) possess a well-distributed pore structure that improves the oxygen transport capacity, thereby facilitating catalytic activity. Additionally, evaluation of the active site distribution of the cathode with a thickness of 2.4 mm (Fe@AC-2.4) revealed a comparable exponential distribution pattern. Furthermore, the findings demonstrate that the 1.5 mm thick monolithic air cathode prepared with agar (Fe@AC-1.5) contains numerous active sites for the ORR and an optimal pore distribution, resulting in an improved ORR activity. The direct-formate fuel cell utilizing Fe@AC-1.5 achieves a maximum power density of 22.63 mW cm^–2. This study introduces easily prepared carbon-based monolithic air cathodes with remarkable ORR properties and offers insights into active site distribution, thereby guiding future enhancements in the ORR performance.

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).