Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 43, Issue -, Pages 95-97Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2014.03.023
Keywords
Gallium oxide; CO2 reduction; Formic acid; Electrolysis; Cathode
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We report on the high-selectivity electrochemical reduction of CO2 to formic acid (HCOOH) using conductive single-crystal Ga2O3. Single-crystalline Sn- or Si-doped Ga2O3 was manufactured using an edge-defined film-fed growth method. The stability of Ga2O3 was confirmed over fifty cyclic voltammetry cycles. In our electrolysis experiments, a Ga2O3 cathode selectively produced HCOOH with a Faradaic efficiency of over 80% by electrochemical reduction of CO2. A possible intermediate state is simulated based on density function theory. Our calculations show the so-called formate on Ga2O3 to be a possible intermediate state in the reaction from CO2 to HCOOH. (C) 2014 Elsevier B.V. All rights reserved.
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