التفاصيل البيبلوغرافية
| العنوان: |
Operando Local pH Measurement within Gas Diffusion Electrodes Performing Electrochemical Carbon Dioxide Reduction |
| المؤلفون: |
Alex J. Welch (1690558), Aidan Q. Fenwick (10130501), Annette Böhme (7040282), Hsiang-Yun Chen (1769167), Ian Sullivan (1529257), Xueqian Li (4863082), Joseph S. DuChene (2106751), Chengxiang Xiang (1848355), Harry A. Atwater (1300098) |
| سنة النشر: |
2021 |
| المجموعة: |
Smithsonian Institution: Digital Repository |
| مصطلحات موضوعية: |
Cell Biology, Physiology, Space Science, Environmental Sciences not elsewhere classified, Biological Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, within deep trenches, trench width decreases, narrow trench regions, micron spatial resolution, confocal fluorescence microscopy, computational models confirm, 100 mm khco, local ph near, local ph increases, 3 , 2 , surface indicate areas, perform selective co, local ph increased, 2 , electrolyte ph near, locally increased activity, operando <, ph across, ph 6, ph 10, three dimensions, study suggests, overpotential required |
| الوصف: |
The local pH near the surface of a CO 2 reduction electrocatalyst strongly impacts catalytic selectivity and activity. Here, confocal fluorescence microscopy was used to map the electrolyte pH near a copper gas diffusion electrode during CO 2 reduction with micron spatial resolution in three dimensions. We observed that the local pH increased from pH 6.8 to greater than pH 10 as the current density was increased from 0 to 28 mA/cm 2 in a 100 mM KHCO 3 electrolyte. Variations in the pH across the surface indicate areas of locally increased activity. Within deep trenches of the active layer, the local pH increases as trench width decreases. Computational models confirm these experimental results and also showed that the catalyst found within narrow trenches is more active than that found at the surface of the electrode. This study suggests that the overpotential required to perform selective CO 2 reduction can be reduced by increasing the density of narrow trench regions in the microporous layer. |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
unknown |
| Relation: |
https://figshare.com/articles/journal_contribution/_i_Operando_i_Local_pH_Measurement_within_Gas_Diffusion_Electrodes_Performing_Electrochemical_Carbon_Dioxide_Reduction/16635648 |
| DOI: |
10.1021/acs.jpcc.1c06265.s001 |
| الاتاحة: |
https://doi.org/10.1021/acs.jpcc.1c06265.s001 |
| Rights: |
CC BY-NC 4.0 |
| رقم الانضمام: |
edsbas.7DDEF07 |
| قاعدة البيانات: |
BASE |