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Title: Supramolecular Tuning Enables Selective Oxygen Reduction Catalyzed by Cobalt Porphyrins for Direct Electrosynthesis of Hydrogen Peroxide

Journal Article · · Angewandte Chemie
ORCiD logo [1];  [2];  [3]; ORCiD logo [2]; ORCiD logo [4]
  1. Department of Chemistry University of California, Berkeley Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720-1460 USA
  2. Department of Chemistry Pohang University of Science and Technology Pohang 37673 Republic of Korea, Center for Self-assembly and Complexity (CSC) Institute for Basic Science (IBS) Pohang 37673 Republic of Korea
  3. Center for Self-assembly and Complexity (CSC) Institute for Basic Science (IBS) Pohang 37673 Republic of Korea
  4. Department of Chemistry University of California, Berkeley Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720-1460 USA, Department of Molecular and Cell Biology University of California, Berkeley Berkeley CA 94720-1460 USA

Abstract We report a supramolecular strategy for promoting the selective reduction of O 2 for direct electrosynthesis of H 2 O 2 . We utilized cobalt tetraphenylporphyrin (Co‐TPP), an oxygen reduction reaction (ORR) catalyst with highly variable product selectivity, as a building block to assemble the permanently porous supramolecular cage Co‐PB‐1(6) bearing six Co‐TPP subunits connected through twenty‐four imine bonds. Reduction of these imine linkers to amines yields the more flexible cage Co‐rPB‐1(6). Both Co‐PB‐1(6) and Co‐rPB‐1(6) cages produce 90–100 % H 2 O 2 from electrochemical ORR catalysis in neutral pH water, whereas the Co‐TPP monomer gives a 50 % mixture of H 2 O 2 and H 2 O. Bimolecular pathways have been implicated in facilitating H 2 O formation, therefore, we attribute this high H 2 O 2 selectivity to site isolation of the discrete molecular units in each supramolecule. The ability to control reaction selectivity in supramolecular structures beyond traditional host–guest interactions offers new opportunities for designing such architectures for a broader range of catalytic applications.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1596166
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 12 Vol. 132; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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