Significantly Enhanced Overall Water Splitting Performance by Partial Oxidation of Ir through Au Modification in Core–Shell Alloy Structure
Developing efficient bifunctional electrocatalysts for overall water splitting in acidic conditions is the essential step for proton exchange membrane water electrolyzers (PEMWEs). We first report the synthesis of core–shell structure nanoparticles (NPs) with an Au core and an AuIr2 alloy shell (Au@...
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| Published in | Journal of the American Chemical Society Vol. 143; no. 12; pp. 4639 - 4645 |
|---|---|
| Main Authors | , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
American Chemical Society
31.03.2021
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| Subjects | |
| Online Access | Get full text |
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| Abstract | Developing efficient bifunctional electrocatalysts for overall water splitting in acidic conditions is the essential step for proton exchange membrane water electrolyzers (PEMWEs). We first report the synthesis of core–shell structure nanoparticles (NPs) with an Au core and an AuIr2 alloy shell (Au@AuIr2). Au@AuIr2 displayed 4.6 (5.6) times higher intrinsic (mass) activity toward the oxygen evolution reaction (OER) than a commercial Ir catalyst. Furthermore, it showed hydrogen evolution reaction (HER) catalytic properties comparable to those of commercial Pt/C. Significantly, when Au@AuIr2 was used as both the anode and cathode catalyst, the overall water splitting cell achieved 10 mA/cm2 with a low cell voltage of 1.55 V and maintained this activity for more than 40 h, which greatly outperformed the commercial couples (Ir/C||Pt/C, 1.63 V, activity decreased within minutes) and is among the most efficient bifunctional catalysts reported. Theoretical calculations coupled with X-ray-based structural analyses suggest that partially oxidized surfaces originating from the electronic interaction between Au and Ir provide a balance for different intermediates binding and realize significantly enhanced OER performance. |
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| AbstractList | Developing efficient bifunctional electrocatalysts for overall water splitting in acidic conditions is the essential step for proton exchange membrane water electrolyzers (PEMWEs). We first report the synthesis of core–shell structure nanoparticles (NPs) with an Au core and an AuIr2 alloy shell (Au@AuIr2). Au@AuIr2 displayed 4.6 (5.6) times higher intrinsic (mass) activity toward the oxygen evolution reaction (OER) than a commercial Ir catalyst. Furthermore, it showed hydrogen evolution reaction (HER) catalytic properties comparable to those of commercial Pt/C. Significantly, when Au@AuIr2 was used as both the anode and cathode catalyst, the overall water splitting cell achieved 10 mA/cm2 with a low cell voltage of 1.55 V and maintained this activity for more than 40 h, which greatly outperformed the commercial couples (Ir/C||Pt/C, 1.63 V, activity decreased within minutes) and is among the most efficient bifunctional catalysts reported. Theoretical calculations coupled with X-ray-based structural analyses suggest that partially oxidized surfaces originating from the electronic interaction between Au and Ir provide a balance for different intermediates binding and realize significantly enhanced OER performance. Developing efficient bifunctional electrocatalysts for overall water splitting in acidic conditions is the essential step for proton exchange membrane water electrolyzers (PEMWEs). We first report the synthesis of core-shell structure nanoparticles (NPs) with an Au core and an AuIr alloy shell (Au@AuIr ). Au@AuIr displayed 4.6 (5.6) times higher intrinsic (mass) activity toward the oxygen evolution reaction (OER) than a commercial Ir catalyst. Furthermore, it showed hydrogen evolution reaction (HER) catalytic properties comparable to those of commercial Pt/C. Significantly, when Au@AuIr was used as both the anode and cathode catalyst, the overall water splitting cell achieved 10 mA/cm with a low cell voltage of 1.55 V and maintained this activity for more than 40 h, which greatly outperformed the commercial couples (Ir/C||Pt/C, 1.63 V, activity decreased within minutes) and is among the most efficient bifunctional catalysts reported. Theoretical calculations coupled with X-ray-based structural analyses suggest that partially oxidized surfaces originating from the electronic interaction between Au and Ir provide a balance for different intermediates binding and realize significantly enhanced OER performance. Developing efficient bifunctional electrocatalysts for overall water splitting in acidic conditions is the essential step for proton exchange membrane water electrolyzers (PEMWEs). We first report the synthesis of core–shell structure nanoparticles (NPs) with an Au core and an AuIr₂ alloy shell (Au@AuIr₂). Au@AuIr₂ displayed 4.6 (5.6) times higher intrinsic (mass) activity toward the oxygen evolution reaction (OER) than a commercial Ir catalyst. Furthermore, it showed hydrogen evolution reaction (HER) catalytic properties comparable to those of commercial Pt/C. Significantly, when Au@AuIr₂ was used as both the anode and cathode catalyst, the overall water splitting cell achieved 10 mA/cm² with a low cell voltage of 1.55 V and maintained this activity for more than 40 h, which greatly outperformed the commercial couples (Ir/C||Pt/C, 1.63 V, activity decreased within minutes) and is among the most efficient bifunctional catalysts reported. Theoretical calculations coupled with X-ray-based structural analyses suggest that partially oxidized surfaces originating from the electronic interaction between Au and Ir provide a balance for different intermediates binding and realize significantly enhanced OER performance. Developing efficient bifunctional electrocatalysts for overall water splitting in acidic conditions is the essential step for proton exchange membrane water electrolyzers (PEMWEs). We first report the synthesis of core-shell structure nanoparticles (NPs) with an Au core and an AuIr2 alloy shell (Au@AuIr2). Au@AuIr2 displayed 4.6 (5.6) times higher intrinsic (mass) activity toward the oxygen evolution reaction (OER) than a commercial Ir catalyst. Furthermore, it showed hydrogen evolution reaction (HER) catalytic properties comparable to those of commercial Pt/C. Significantly, when Au@AuIr2 was used as both the anode and cathode catalyst, the overall water splitting cell achieved 10 mA/cm2 with a low cell voltage of 1.55 V and maintained this activity for more than 40 h, which greatly outperformed the commercial couples (Ir/C||Pt/C, 1.63 V, activity decreased within minutes) and is among the most efficient bifunctional catalysts reported. Theoretical calculations coupled with X-ray-based structural analyses suggest that partially oxidized surfaces originating from the electronic interaction between Au and Ir provide a balance for different intermediates binding and realize significantly enhanced OER performance.Developing efficient bifunctional electrocatalysts for overall water splitting in acidic conditions is the essential step for proton exchange membrane water electrolyzers (PEMWEs). We first report the synthesis of core-shell structure nanoparticles (NPs) with an Au core and an AuIr2 alloy shell (Au@AuIr2). Au@AuIr2 displayed 4.6 (5.6) times higher intrinsic (mass) activity toward the oxygen evolution reaction (OER) than a commercial Ir catalyst. Furthermore, it showed hydrogen evolution reaction (HER) catalytic properties comparable to those of commercial Pt/C. Significantly, when Au@AuIr2 was used as both the anode and cathode catalyst, the overall water splitting cell achieved 10 mA/cm2 with a low cell voltage of 1.55 V and maintained this activity for more than 40 h, which greatly outperformed the commercial couples (Ir/C||Pt/C, 1.63 V, activity decreased within minutes) and is among the most efficient bifunctional catalysts reported. Theoretical calculations coupled with X-ray-based structural analyses suggest that partially oxidized surfaces originating from the electronic interaction between Au and Ir provide a balance for different intermediates binding and realize significantly enhanced OER performance. |
| Author | Sun, Fanfei Cao, Minna Wang, Huimin Zhuang, Wei Cao, Rong You, Hanhui Chen, Zhe-ning Zhang, Hao Wu, Dongshuang |
| AuthorAffiliation | State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Division of Chemistry, Graduate School of Science Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics University of Chinese Academy of Sciences |
| AuthorAffiliation_xml | – name: Division of Chemistry, Graduate School of Science – name: Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics – name: University of Chinese Academy of Sciences – name: Chinese Academy of Sciences – name: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter |
| Author_xml | – sequence: 1 givenname: Huimin surname: Wang fullname: Wang, Huimin organization: University of Chinese Academy of Sciences – sequence: 2 givenname: Zhe-ning orcidid: 0000-0003-3821-5843 surname: Chen fullname: Chen, Zhe-ning organization: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter – sequence: 3 givenname: Dongshuang orcidid: 0000-0001-8512-8473 surname: Wu fullname: Wu, Dongshuang organization: Division of Chemistry, Graduate School of Science – sequence: 4 givenname: Minna orcidid: 0000-0002-3418-4229 surname: Cao fullname: Cao, Minna email: mncao@fjirsm.ac.cn organization: University of Chinese Academy of Sciences – sequence: 5 givenname: Fanfei surname: Sun fullname: Sun, Fanfei organization: University of Chinese Academy of Sciences – sequence: 6 givenname: Hao orcidid: 0000-0003-2300-1404 surname: Zhang fullname: Zhang, Hao organization: University of Chinese Academy of Sciences – sequence: 7 givenname: Hanhui surname: You fullname: You, Hanhui organization: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter – sequence: 8 givenname: Wei surname: Zhuang fullname: Zhuang, Wei email: wzhuang@fjirsm.ac.cn organization: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter – sequence: 9 givenname: Rong orcidid: 0000-0002-2398-399X surname: Cao fullname: Cao, Rong email: rcao@fjirsm.ac.cn organization: University of Chinese Academy of Sciences |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/33656891$$D View this record in MEDLINE/PubMed |
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| Snippet | Developing efficient bifunctional electrocatalysts for overall water splitting in acidic conditions is the essential step for proton exchange membrane water... |
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| SubjectTerms | alloys anodes catalysts cathodes electric potential difference hydrogen production oxidation oxygen production |
| Title | Significantly Enhanced Overall Water Splitting Performance by Partial Oxidation of Ir through Au Modification in Core–Shell Alloy Structure |
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