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1D α-Fe 2 O 3 /ZnO Junction Arrays Modified by Bi as Photocathode: High Efficiency in Photoelectrochemical Reduction of CO 2 to HCOOH.
- Source :
-
The journal of physical chemistry letters [J Phys Chem Lett] 2022 Jul 28; Vol. 13 (29), pp. 6867-6874. Date of Electronic Publication: 2022 Jul 21. - Publication Year :
- 2022
-
Abstract
- Photoelectrocatalytic (PEC) CO <subscript>2</subscript> reduction to value-added chemicals is a promising solution to address the energy and environmental issues we face currently. Herein, a unique photocathode Bi@ZFO NTs (Bi and α-Fe <subscript>2</subscript> O <subscript>3</subscript> co-modified ZnO nanorod arrays) with high utilization of visible light and sharp-tips effect are successfully prepared using a facile method. Impressively, the performance of Bi@ZFO NTs for PEC CO <subscript>2</subscript> reduction to HCOOH included small onset potential (-0.53 V vs RHE), Tafel slope (101.2 mV dec <superscript>-1</superscript> ), and a high faraday efficiency of 61.2% at -0.65 V vs RHE as well as favorable stability over 4 h in an aqueous system under visible light illumination. Also, a series of experiments were performed to investigate the origin of its high activity, indicating that the metallic Bi and α-Fe <subscript>2</subscript> O <subscript>3</subscript> /ZnO nanojunction should be responsible for the favorable CO <subscript>2</subscript> adsorption/activation and charge transition/carrier separation, respectively. Density functional theory calculations reveal that the Bi@ZFO NTs could lower the intermediates' energy barrier of HCOO* and HCOOH* to form HCOOH due to the strong interaction of Bi and α-Fe <subscript>2</subscript> O <subscript>3</subscript> /ZnO.
Details
- Language :
- English
- ISSN :
- 1948-7185
- Volume :
- 13
- Issue :
- 29
- Database :
- MEDLINE
- Journal :
- The journal of physical chemistry letters
- Publication Type :
- Academic Journal
- Accession number :
- 35861318
- Full Text :
- https://doi.org/10.1021/acs.jpclett.2c01509