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Article: Highly Efficient Oxygen Reduction Catalysts by Rational Synthesis of Nanoconfined Maghemite in a Nitrogen-Doped Graphene Framework

TitleHighly Efficient Oxygen Reduction Catalysts by Rational Synthesis of Nanoconfined Maghemite in a Nitrogen-Doped Graphene Framework
Authors
Keywordsalkaline electrolyte
hierarchical graphene framework
oxygen reduction reaction
nitrogen doping
maghemite
Issue Date2016
Citation
ACS Catalysis, 2016, v. 6, n. 6, p. 3558-3568 How to Cite?
Abstract© 2016 American Chemical Society. The oxygen reduction reaction (ORR) is critical for electrochemical energy storage and conversion: e.g., in fuel cells and metal-air batteries. A major challenge is to develop cost-effective and durable ORR catalysts, to replace the relatively expensive platinum-loaded carbon (PtC) counterparts, particularly for large-scale applications. Despite progress over the past few decades in developing efficient non-precious-metal (NPM) catalysts, such as Fe/N/C-based materials (the best-known alternatives), most of the reported catalytic activities have yet to match that of PtC. Herein we propose a two-step process for the production of highly efficient NPM catalysts that outperform PtC in alkaline media: (1) a hierarchical porosity of a supporting substrate is generated and optimized in advance, especially to achieve a high total pore volume for rapid mass transfer, and (2) an appropriate amount of NPM precursor is added to the optimized substrate to boost the reduction potential while maintaining the hierarchically porous structure. Such a scheme was successfully applied to a case of nanoconfined maghemite (γ-Fe2O3) in a nitrogen-doped graphene framework. The resulting catalyst system surpasses the performance of the equivalent commercial PtC, in terms of a higher reduction potential, a significantly lower peroxide formation ratio, more than tripled kinetic current density, smaller Tafel slope, better durability, etc. The reported catalyst is also among the best of all the existing Fe-based ORR catalysts, indicating the great potential of I'-Fe2O3for ORR in practical applications.
Persistent Identifierhttp://hdl.handle.net/10722/263075
ISSN
2023 Impact Factor: 11.3
2023 SCImago Journal Rankings: 3.847
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorQiu, Kaipei-
dc.contributor.authorChai, Guoliang-
dc.contributor.authorJiang, Chaoran-
dc.contributor.authorLing, Min-
dc.contributor.authorTang, Junwang-
dc.contributor.authorGuo, Zhengxiao-
dc.date.accessioned2018-10-08T09:29:15Z-
dc.date.available2018-10-08T09:29:15Z-
dc.date.issued2016-
dc.identifier.citationACS Catalysis, 2016, v. 6, n. 6, p. 3558-3568-
dc.identifier.issn2155-5435-
dc.identifier.urihttp://hdl.handle.net/10722/263075-
dc.description.abstract© 2016 American Chemical Society. The oxygen reduction reaction (ORR) is critical for electrochemical energy storage and conversion: e.g., in fuel cells and metal-air batteries. A major challenge is to develop cost-effective and durable ORR catalysts, to replace the relatively expensive platinum-loaded carbon (PtC) counterparts, particularly for large-scale applications. Despite progress over the past few decades in developing efficient non-precious-metal (NPM) catalysts, such as Fe/N/C-based materials (the best-known alternatives), most of the reported catalytic activities have yet to match that of PtC. Herein we propose a two-step process for the production of highly efficient NPM catalysts that outperform PtC in alkaline media: (1) a hierarchical porosity of a supporting substrate is generated and optimized in advance, especially to achieve a high total pore volume for rapid mass transfer, and (2) an appropriate amount of NPM precursor is added to the optimized substrate to boost the reduction potential while maintaining the hierarchically porous structure. Such a scheme was successfully applied to a case of nanoconfined maghemite (γ-Fe2O3) in a nitrogen-doped graphene framework. The resulting catalyst system surpasses the performance of the equivalent commercial PtC, in terms of a higher reduction potential, a significantly lower peroxide formation ratio, more than tripled kinetic current density, smaller Tafel slope, better durability, etc. The reported catalyst is also among the best of all the existing Fe-based ORR catalysts, indicating the great potential of I'-Fe2O3for ORR in practical applications.-
dc.languageeng-
dc.relation.ispartofACS Catalysis-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectalkaline electrolyte-
dc.subjecthierarchical graphene framework-
dc.subjectoxygen reduction reaction-
dc.subjectnitrogen doping-
dc.subjectmaghemite-
dc.titleHighly Efficient Oxygen Reduction Catalysts by Rational Synthesis of Nanoconfined Maghemite in a Nitrogen-Doped Graphene Framework-
dc.typeArticle-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1021/acscatal.6b00531-
dc.identifier.scopuseid_2-s2.0-84973646351-
dc.identifier.volume6-
dc.identifier.issue6-
dc.identifier.spage3558-
dc.identifier.epage3568-
dc.identifier.isiWOS:000377326700019-
dc.identifier.issnl2155-5435-

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