TY - JOUR
T1 - Electrochemical CO2 reduction on sub-microcrystalline boron-doped diamond electrodes
AU - Peng, Zhen
AU - Xu, Jing
AU - Kurihara, Kaori
AU - Tomisaki, Mai
AU - Einaga, Yasuaki
N1 - Funding Information:
This work was partially supported by JSPS Grant-in-Aid for Scientific Research A 19H00832 (to Y. E.), New Energy and Industrial Technology Development Organization (NEDO) P16002 (to Y. E.), and China Scholarship Council (to Z. P.).
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/12
Y1 - 2021/12
N2 - Boron-doped diamond (BDD) electrodes are being increasingly investigated for application to electrochemical CO2 reduction. Previous, studies have mainly focused on microcrystalline (MC) BDD electrodes. In our study, we present an analysis of electrochemical CO2 reduction using sub-microcrystalline (SMC) BDD electrodes with different boron doping concentrations (0.28%, 0.11% and 0.03%). Unlike the microcrystalline case, these synthetic SMC BDD films with high sp2-bonded carbon do not show a boron-concentration dependence in terms of the activity of CO2 reduction to form formic acid (HCOOH). All the electrodes enabled efficient CO2 reduction at close to the maximum Faradaic efficiency for HCOOH in the range of 70% to 80%. From our observations, it is suggested that the sp2-bonded carbon should be crucial for the CO2 reduction. The results are hoped to enable a relaxation on the restrictions on the use of BDD electrodes towards industrial CO2 reduction application.
AB - Boron-doped diamond (BDD) electrodes are being increasingly investigated for application to electrochemical CO2 reduction. Previous, studies have mainly focused on microcrystalline (MC) BDD electrodes. In our study, we present an analysis of electrochemical CO2 reduction using sub-microcrystalline (SMC) BDD electrodes with different boron doping concentrations (0.28%, 0.11% and 0.03%). Unlike the microcrystalline case, these synthetic SMC BDD films with high sp2-bonded carbon do not show a boron-concentration dependence in terms of the activity of CO2 reduction to form formic acid (HCOOH). All the electrodes enabled efficient CO2 reduction at close to the maximum Faradaic efficiency for HCOOH in the range of 70% to 80%. From our observations, it is suggested that the sp2-bonded carbon should be crucial for the CO2 reduction. The results are hoped to enable a relaxation on the restrictions on the use of BDD electrodes towards industrial CO2 reduction application.
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U2 - 10.1016/j.diamond.2021.108608
DO - 10.1016/j.diamond.2021.108608
M3 - Article
AN - SCOPUS:85115136978
SN - 0925-9635
VL - 120
JO - Diamond and Related Materials
JF - Diamond and Related Materials
M1 - 108608
ER -