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08-11-2023 | Original Article

Spatial construction of ultrasmall Pt-decorated 3D spinel oxide-modified N-doped graphene nanoarchitectures as high-efficiency methanol oxidation electrocatalysts

Authors: Qi Zhang, Min-Min Yan, Wen-Fa Du, Chen-Yu Yin, Jian Zhang, Lu Yang, Yun-Qing Kang, Hai-Yan He, Hua-Jie Huang

Published in: Rare Metals | Issue 1/2024

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Abstract

Direct methanol fuel cell technology recently becomes the focus of both academic and engineering circles, which stimulates the exploitation and utilization of advanced electrode catalysts with high activity and long lifespan. Herein, we demonstrate a robust bottom-up approach to the spatial construction of three-dimensional (3D) spinel manganese-cobalt oxide-modified N-doped graphene nanoarchitectures decorated with ultrasmall Pt nanoparticles (Pt/MnCo₂O₄-NG) via a controllable self-assembly process. The incorporation of MnCo₂O₄ nanocrystals provides abundant hydroxyl sources to promote the oxidative removal of CO-like byproducts on Pt sites, while the existence of 3D porous N-doped graphene networks facilitates the transportation of both ions and electrons in the hybrid system, thus giving rise to remarkable synergetic coupling effects during the methanol oxidation process. Consequently, the optimized Pt/MnCo₂O₄-NG nanoarchitecture expresses exceptional electrocatalytic properties with a large electrochemically active surface area of 99.5 m²·g⁻¹, a high mass activity of 1508.3 mA·mg⁻¹, strong toxicity resistance and reliable long-term durability, which have obvious competitive advantages over those of conventional Pt/carbon black, Pt/carbon nanotube, Pt/graphene, and Pt/N-doped graphene catalysts with the same Pt usage.

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Title: Spatial construction of ultrasmall Pt-decorated 3D spinel oxide-modified N-doped graphene nanoarchitectures as high-efficiency methanol oxidation electrocatalysts
Authors: Qi Zhang
Min-Min Yan
Wen-Fa Du
Chen-Yu Yin
Jian Zhang
Lu Yang
Yun-Qing Kang
Hai-Yan He
Hua-Jie Huang
Publication date: 08-11-2023
Publisher: Nonferrous Metals Society of China
Published in: Rare Metals / Issue 1/2024
Print ISSN: 1001-0521
Electronic ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-023-02418-6

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