A highly efficient electrocatalyst for oxygen reduction reaction: Spinel MnCo2O4 nanoparticles supported on three-dimensional Nitrogen-doped graphene material with interconnected hierarchical porous nanostructure

We designed and synthesized spinel MnCo2O4 nanoparticles supported on three-dimensional nitrogen-doped graphene (NG) with interconnected hierarchical porous nanostructure, in which polymer (2, 5-benzimidazole) (ABPBI) was used as the nitrogen precursor and the carbon precursor. Unique properties of...

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Published inJournal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 922; p. 116802
Main Authors Zhang, Tingwei, Zhao, Zhen, Li, Tiechun, Diao, Quanping, Lv, Linlin, Li, Zhongfang
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Science Ltd 01.10.2022
Subjects
Accelerated tests
Aromaticity
Chemical reduction
Dehydrogenation
Durability
Electrocatalysts
Fuel cells
Graphene
Mass transport
Nanoparticles
Nanostructure
Nitrogen
Noble metals
Oxygen reduction reactions
Platinum
Porous materials
Precursors
Pyrolysis
Reaction kinetics
Spinel
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Summary:We designed and synthesized spinel MnCo2O4 nanoparticles supported on three-dimensional nitrogen-doped graphene (NG) with interconnected hierarchical porous nanostructure, in which polymer (2, 5-benzimidazole) (ABPBI) was used as the nitrogen precursor and the carbon precursor. Unique properties of ABPBI including nitrogen-rich aromaticity and rigid plane molecule were conductive to form NG structures through the pyrolysis dehydrogenative and carbonization. The as-prepared MnCo2O4-3DNG with interconnected hierarchical porous graphene structure possessed enriched defects and more exposed active sites, accelerating mass transport and facilitating diffusion kinetics for better catalytic ORR performance. MnCo2O4-3DNG exhibited a higher half-wave potential (0.85 V vs RHE) than 20 wt% Pt/C (0.83 V vs RHE). Moreover, the accelerated durability test and i-t chronoamperometry of MnCo2O4-3DNG revealed more excellent durability than 20 wt% Pt/C. The electrochemical tests results demonstrated that MnCo2O4-3DNG was promising as a cost-effective non-noble metal catalyst for ORR in fuel cell technology.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2022.116802