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Title: Graphite-conjugation enhances porphyrin electrocatalysis

Journal Article · · ACS Catalysis
 [1];  [2];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); Illinois Inst. of Technology, Chicago, IL (United States)

We synthesize porphyrins that are strongly electronically coupled to carbon electrodes by condensing diaminoporphyrin derivatives onto o-quinone moieties native to graphitic carbon surfaces. X-ray photoelectron and absorption spectroscopies along with electrochemical data establish the formation of a high-fidelity conjugated pyrazine linkage to the surface with preservation of the metalloporphyrin scaffold. Using the O2 reduction reaction (ORR) as a probe, we find that conjugation dramatically promotes the rate of catalysis. A graphite-conjugated Co porphyrin, GCC-CoTPP, displays an onset current of 10 μA/cm2 at 0.72 V versus the reversible hydrogen electrode, whereas a non-conjugated amide-linked Co-porphyrin onsets at 0.66 V. This corresponds to an order of magnitude enhancement in the activation-controlled turnover frequencies for ORR upon conjugation. Conclusively, this work establishes a versatile platform for examining the emergent reactivity of porphyrins strongly coupled to metallic electrodes.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0014176
OSTI ID:
1501360
Journal Information:
ACS Catalysis, Vol. 9, Issue 4; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 47 works
Citation information provided by
Web of Science

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Supramolecular Tuning Enables Selective Oxygen Reduction Catalyzed by Cobalt Porphyrins for Direct Electrosynthesis of Hydrogen Peroxide journal January 2020
Liquefied Sunshine: Transforming Renewables into Fertilizers and Energy Carriers with Electromaterials journal November 2019
Supramolecular Tuning Enables Selective Oxygen Reduction Catalyzed by Cobalt Porphyrins for Direct Electrosynthesis of Hydrogen Peroxide journal January 2020
Elucidating the origins of enhanced CO 2 reduction in manganese electrocatalysts bearing pendant hydrogen-bond donors journal January 2019