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Electrocatalytic Reduction of CO 2 to Acetic Acid by a Molecular Manganese Corrole Complex
Author(s) -
De Ratnadip,
Gonglach Sabrina,
Paul Shounik,
Haas Michael,
Sreejith S. S.,
Gerschel Philipp,
Apfel UlfPeter,
Vuong Thanh Huyen,
Rabeah Jabor,
Roy Soumyajit,
Schöfberger Wolfgang
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202000601
Subject(s) - corrole , chemistry , acetic acid , catalysis , electrochemistry , aqueous solution , selectivity , inorganic chemistry , oxalate , manganese , electrochemical reduction of carbon dioxide , context (archaeology) , organic chemistry , electrode , carbon monoxide , paleontology , biology
The controlled electrochemical reduction of carbon dioxide to value added chemicals is an important strategy in terms of renewable energy technologies. Therefore, the development of efficient and stable catalysts in an aqueous environment is of great importance. In this context, we focused on synthesizing and studying a molecular Mn III ‐corrole complex, which is modified on the three meso ‐positions with polyethylene glycol moieties for direct and selective production of acetic acid from CO 2 . Electrochemical reduction of Mn III leads to an electroactive Mn II species, which binds CO 2 and stabilizes the reduced intermediates. This catalyst allows to electrochemically reduce CO 2 to acetic acid in a moderate acidic aqueous medium (pH 6) with a selectivity of 63 % and a turn over frequency (TOF) of 8.25 h −1 , when immobilized on a carbon paper (CP) electrode. In terms of high selectivity towards acetate, we propose the formation and reduction of an oxalate type intermediate, stabilized at the Mn III ‐corrole center.