Steering CO Selectivity in CO2 Electroreduction over Silver Microtubular Gas-Diffusion Electrodes via Surface Reconstruction
Article
Article Title | Steering CO Selectivity in CO2 Electroreduction over Silver Microtubular Gas-Diffusion Electrodes via Surface Reconstruction |
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ERA Journal ID | 3878 |
Article Category | Article |
Authors | Kuang, Yizhu, Chen, Guoliang, Rabiee, Hesamoddin, Ma, Beibei, Dorosti, Fatereh, Nanjundan, Ashok Kumar, Zhu, Zhonghua, Wang, Hao and Ge, Lei |
Journal Title | Energy and Fuels |
Journal Citation | 38 (11), pp. 10096-10105 |
Number of Pages | 10 |
Year | 2024 |
Publisher | American Chemical Society |
Place of Publication | United States |
ISSN | 0887-0624 |
1520-5029 | |
Digital Object Identifier (DOI) | https://doi.org/10.1021/acs.energyfuels.4c01240 |
Web Address (URL) | https://pubs.acs.org/doi/10.1021/acs.energyfuels.4c01240 |
Abstract | An efficient gas diffusion electrode (GDE) is crucial for enhancing mass transport involving gas-phase CO2 conversion in the electrochemical CO2 reduction reaction (CO2RR). Microtubular hollow fiber GDE (HFGDE) with a porous hierarchical wall has garnered significant attention, which can modulate the triple-phase reaction zone and improve the performance of CO2RR. Simultaneously, engineering nano/microstructure surfaces of electrocatalysts have been demonstrated to effectively enhance the selectivity and activity in CO2RR. Here, we developed a porous microparticle Ag-based HFGDE via an in situ electrochemical oxidation–reduction method. Both the activity and selectivity of CO2 to CO conversion in the porous microparticle Ag-based HFGDE showed significant enhancement over the pristine and thermal reduced Ag HFGDE without surface reconstruction. At −1.2 V vs RHE, the faradaic efficiency for CO is 94%, with a partial current density of 83.4 mA cm–2, surpassing that of thermal treatment electrodes, which is only 26% with a partial current density of 12.3 mA cm–2. The distinctive reconstruction nano/microstructure on the electrocatalyst surface could be attributed to decreasing the activation energy barrier in the rate-limiting step of initial electron/proton transfer. This work represents a facile strategy for surface reconstruction of electrocatalysts in HFGDE as advanced electrode materials to enhance the efficiency of the CO2 conversion. |
Keywords | Surface Reconstruction; gas diffusion electrode; CO2 conversion |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 400404. Electrochemical energy storage and conversion |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Centre for Future Materials |
University of Queensland | |
School of Engineering |
https://research.usq.edu.au/item/z7635/steering-co-selectivity-in-co2-electroreduction-over-silver-microtubular-gas-diffusion-electrodes-via-surface-reconstruction
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