Open AccessAnthraquinone-Mediated Fuel Cell Anode with an Off-Electrode Heterogeneous Catalyst Accessing High Power Density When Paired with a Mediated Cathode
Author(s) -
Yuliya Preger,
Mathew R. Johnson,
Sourav Biswas,
Colin W. Anson,
Thatcher W. Root,
Shan S. Stahl
Publication year - 2020
Publication title -
acs energy letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 8.632
H-Index - 105
ISSN - 2380-8195
DOI - 10.1021/acsenergylett.0c00631
Subject(s) - electrochemistry , redox , anode , catalysis , cathode , electrode , chemistry , electrochemical cell , electrochemical energy conversion , inorganic chemistry , chemical energy , chemical engineering , materials science , organic chemistry , engineering
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 H 2 at an off-electrode heterogeneous catalyst. This unique approach to integrate chemical and electrochemical redox processes accesses power densities up to 228 mW/cm 2 (528 mW/cm 2 with iR-correction). These values are significantly higher than those observed in previous mediated electrochemical H 2 oxidation methods, including those using enzymes or inorganic mediators. The approach described herein shows how traditional catalytic chemistry can be coupled to electrochemical devices.