Tunable Synthesis of Hollow Metal-Nitrogen-Carbon Capsules for Efficient Oxygen Reduction Catalysis in Proton Exchange Membrane Fuel Cells.

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dc.contributor.author Yang, Hui en
dc.contributor.author Chen, Xing en
dc.contributor.author Chen, Wan-Ting en
dc.contributor.author Wang, Qing en
dc.contributor.author Cuello, Nelly Cantillo en
dc.contributor.author Nafady, Ayman en
dc.contributor.author Al-Enizi, Abdullah M en
dc.contributor.author Waterhouse, Geoffrey en
dc.contributor.author Goenaga, Gabriel A en
dc.contributor.author Zawodzinski, Thomas A en
dc.contributor.author Kruger, Paul E en
dc.contributor.author Clements, John E en
dc.contributor.author Zhang, Jian en
dc.contributor.author Tian, He en
dc.contributor.author Telfer, Shane G en
dc.contributor.author Ma, Shengqian en
dc.date.accessioned 2019-11-05T01:40:20Z en
dc.date.issued 2019-07 en
dc.identifier.issn 1936-0851 en
dc.identifier.uri http://hdl.handle.net/2292/48843 en
dc.description.abstract Atomically dispersed metal catalysts anchored on nitrogen-doped (N-doped) carbons demand attention due to their superior catalytic activity relative to that of metal nanoparticle catalysts in energy storage and conversion processes. Herein, we introduce a simple and versatile strategy for the synthesis of hollow N-doped carbon capsules that contain one or more atomically dispersed metals (denoted as H-M-Nx-C and H-Mmix-Nx-C, respectively, where M = Fe, Co, or Ni). This method utilizes the pyrolysis of nanostructured core-shell precursors produced by coating a zeolitic imidazolate framework core with a metal-tannic acid (M-TA) coordination polymer shell (containing up to three different metal cations). Pyrolysis of these core-shell precursors affords hollow N-doped carbon capsules containing monometal sites (e.g., Fe-Nx, CoNx, or Ni-Nx) or multimetal sites (Fe/Co-Nx, Fe/Ni-Nx, Co/Ni-Nx, or Fe/Co/Ni-Nx). This inventory allowed exploration of the relationship between catalyst composition and electrochemical activity for the oxygen reduction reaction (ORR) in acidic solution. H-Fe-Nx-C, H-Co-Nx-C, H-FeCo-Nx-C, H-FeNi-Nx-C, and H-FeCoNi-Nx-C were particularly efficient ORR catalysts in acidic solution. Furthermore, the H-Fe-Nx-C catalyst exhibited outstanding initial performance when applied as a cathode material in a proton exchange membrane fuel cell. The synthetic methodology introduced here thus provides a convenient route for developing next-generation catalysts based on earth-abundant components. en
dc.format.medium Print-Electronic en
dc.language eng en
dc.relation.ispartofseries ACS nano en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Tunable Synthesis of Hollow Metal-Nitrogen-Carbon Capsules for Efficient Oxygen Reduction Catalysis in Proton Exchange Membrane Fuel Cells. en
dc.type Journal Article en
dc.identifier.doi 10.1021/acsnano.9b02930 en
pubs.issue 7 en
pubs.begin-page 8087 en
pubs.volume 13 en
dc.rights.holder Copyright: The author en
pubs.end-page 8098 en
pubs.publication-status Published en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Journal Article en
pubs.elements-id 776323 en
pubs.org-id Science en
pubs.org-id Chemistry en
dc.identifier.eissn 1936-086X en
pubs.record-created-at-source-date 2019-06-28 en
pubs.dimensions-id 31244037 en


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