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- Title
Metal-organic-frameworks passivated CuBi2O4 photocathodes boost CO2 reduction kinetics.
- Authors
Jiaqi Jin; Guangming Cao; Yanjie Liu; Yingying Shu; Zhiyuan Deng; Wei Sun; Xiaogang Yang
- Abstract
Photoelectrochemical reduction of CO2 to produce CO with metal-organic frameworks (MOFs) is recognized as a desirable technology to mitigate CO2 emission and generate sustainable energy. To achieve highly efficient electrocatalyst, it is essential to design a new material interface and uncover new reaction mechanisms or kinetics. Herein, we developed two metal-organic Cu-MOF and Bi-MOF layers using benzene tricarboxylic acid (H3BTC) ligands on CuBi2O4 photocathodes. Both MOF layers drastically improved the photoelectrochemical stability by suppressing the photo-corrosion through conformal surface passivation. The Cu-MOF modified CuBi2O4 showed more significant charge separation and transfer efficiencies than the Bi-MOF modified control. Based on the transient photocurrent curves under the applied potential of 0.6 V vs. RHE, the rate-law analysis showed the CO2 photoreduction took place through a first-order reaction. Further, the photoelectrochemical impedance spectra (PEIS) revealed this reaction order, representing an “operando” analysis. Moreover, the reaction rate constant on Cu-MOF modified sample was higher than that on Bi-MOF modified one and bare CuBi2O4. Combined with the density functional theory calculation, the surface absorption of CO2 and CO molecules and the higher energy barrier for ∗COOH intermediates could significantly determine the first order reaction.
- Subjects
PHOTOELECTROCHEMICAL cells; PHOTOCATHODES; ELECTROCATALYSTS; LIGANDS (Chemistry); BENZENE
- Publication
Materials Reports: Energy, 2023, Vol 3, Issue 4, p1
- ISSN
2666-9358
- Publication type
Article
- DOI
10.1016/j.matre.2023.100229