TY - JOUR
T1 - Selectively converting CO2 to HCOOH on Cu-alloys integrated in hematite-driven artificial photosynthetic cells
AU - Zhao, Jiwu
AU - Huang, Liang
AU - Xue, Lan
AU - Niu, Zhenjie
AU - Zhang, Zizhong
AU - Ding, Zhengxin
AU - Yuan, Rusheng
AU - Lu, Xu
AU - Long, Jinlin
N1 - KAUST Repository Item: Exported on 2023-03-01
Acknowledged KAUST grant number(s): BAS/1/1413-01-01
Acknowledgements: This work was financially supported by the National Key R&D Program of China (2018YFE0208500) and the National Natural Science Foundation of China (Grants No. 22072022). X. L. was funded by King Abdullah University of Science and Technology (KAUST) through the baseline funding (BAS/1/1413-01-01).
PY - 2023/2/16
Y1 - 2023/2/16
N2 - The integration of electrochemical CO2 reduction (CO2RR) and photoelectrochemical water oxidation offers a sustainable access to valuable chemicals and fuels. Here, we develop a rapidly annealed hematite photoanode with a photocurrent density of 2.83 mA cm−2 at 1.7 VRHE to drive the full-reaction. We also present Cu-alloys electrocatalysis extended from CuInSnS4, which are superior in both activity and selectivity for CO2RR. Specifically, the screened CuInSn achieves a CO2 to HCOOH Faradaic efficiency of 93% at a cell voltage of −2.0 V by assembling into artificial photosynthesis cell. The stability test of IT exhibits less than 3% degradation over 24 h. Furthermore, in-situ Raman spectroscopy reveals that both CO32- and CO2 are involved in CO2RR as reactants. The preferential affinity of C for H in the *HCO2 intermediate enables an improved HCOOH-selectivity, highlighting the role of multifunctional Cu in reducing the cell voltage and enhancing the photocurrent density.
AB - The integration of electrochemical CO2 reduction (CO2RR) and photoelectrochemical water oxidation offers a sustainable access to valuable chemicals and fuels. Here, we develop a rapidly annealed hematite photoanode with a photocurrent density of 2.83 mA cm−2 at 1.7 VRHE to drive the full-reaction. We also present Cu-alloys electrocatalysis extended from CuInSnS4, which are superior in both activity and selectivity for CO2RR. Specifically, the screened CuInSn achieves a CO2 to HCOOH Faradaic efficiency of 93% at a cell voltage of −2.0 V by assembling into artificial photosynthesis cell. The stability test of IT exhibits less than 3% degradation over 24 h. Furthermore, in-situ Raman spectroscopy reveals that both CO32- and CO2 are involved in CO2RR as reactants. The preferential affinity of C for H in the *HCO2 intermediate enables an improved HCOOH-selectivity, highlighting the role of multifunctional Cu in reducing the cell voltage and enhancing the photocurrent density.
UR - http://hdl.handle.net/10754/689486
UR - https://linkinghub.elsevier.com/retrieve/pii/S2095495623000049
UR - http://www.scopus.com/inward/record.url?scp=85148336842&partnerID=8YFLogxK
U2 - 10.1016/j.jechem.2022.12.062
DO - 10.1016/j.jechem.2022.12.062
M3 - Article
SN - 2095-4956
VL - 79
SP - 601
EP - 610
JO - Journal of Energy Chemistry
JF - Journal of Energy Chemistry
ER -