2020
DOI: 10.1021/acsenergylett.0c00631
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Anthraquinone-Mediated Fuel Cell Anode with an Off-Electrode Heterogeneous Catalyst Accessing High Power Density When Paired with a Mediated Cathode

Abstract: The development of processes for electrochemical energy conversion and chemical production could benefit from new strategies to interface chemical redox reactions with electrodes. Here, we employ a diffusible low-potential organic redox mediator, 9,10-anthraquinone-2,7-disulfonic acid (AQDS), to promote efficient electrochemical oxidation of H2 at an off-electrode heterogeneous catalyst. This unique approach to integrate chemical and electrochemical redox processes accesses power densities up to 228 mW/cm2 (52… Show more

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Cited by 22 publications
(21 citation statements)
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“…Homolytic bond scission of N–H bonds, in which the electron and proton are transferred together, can be facilitated by molecular mediators, which are organic molecules that can abstract a hydrogen atom in solution, achieving “redox communication” between the electrode and a catalyst in the bulk solution. Stahl and co-workers have shown that molecular mediators can lead to remarkable improvements in the rates and overpotentials of electrocatalytic reduction of O 2 , oxidation of alcohols, fuel cells, , and oxidation of organic compounds . A homolytic pathway avoids a buildup of charge, so these mechanisms are generally less solvent-dependent than those involving separate electron and proton transfers.…”
Section: Homolytic N–h Bond Cleavagementioning
confidence: 99%
“…Homolytic bond scission of N–H bonds, in which the electron and proton are transferred together, can be facilitated by molecular mediators, which are organic molecules that can abstract a hydrogen atom in solution, achieving “redox communication” between the electrode and a catalyst in the bulk solution. Stahl and co-workers have shown that molecular mediators can lead to remarkable improvements in the rates and overpotentials of electrocatalytic reduction of O 2 , oxidation of alcohols, fuel cells, , and oxidation of organic compounds . A homolytic pathway avoids a buildup of charge, so these mechanisms are generally less solvent-dependent than those involving separate electron and proton transfers.…”
Section: Homolytic N–h Bond Cleavagementioning
confidence: 99%
“…Stahl and co-workers reported a double MedFC using Na 4 H 3 PMo 8 V 4 O 40 as a cathodic mediator paired with a mediated anode consisting of a Pt/C catalyst and anthraquinone mediator to mediate H 2 oxidation . In initial tests using the mediated anode with a conventional cathode consisting of a Pt/C electrocatalyst, low power densities were obtained due to flooding of the cathode.…”
Section: The Cathode: Oxygen Reductionmentioning
confidence: 99%
“…Schematic of MedFC utilizing AQDS as an anodic mediator for H 2 oxidation with a Pt/C catalyst and a POM-mediated cathode. Adapted from ref .…”
Section: The Anode: Hydrogen Alcohol and Biomass Oxidationmentioning
confidence: 99%
“…The schematic diagram of the redox fuel cells is shown in Scheme 1. So far, inorganic redox couples of V 2+ /V 3+ [16][17][18][19][20][21] and aqueous organic redox couples of methyl viologen, [22] quinoxaline, [23] and anthraquinone [24] have been used as redox fuels. However, some of the inherent properties of these redox couples make it difficult for their fuel cells to achieve high output performance.…”
Section: Introductionmentioning
confidence: 99%