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Title: | Potentiometric Rotating Ring Disk Electrode Study of Interfacial pH during CO2 Reduction and H-2 Generation in Neutral and Weakly Acidic Media | Authors: | Tackett, Brian M. Raciti, David BRADY, Nick Ritzert, Nicole L. Moffat, Thomas P. |
Issue Date: | 2022 | Publisher: | AMER CHEMICAL SOC | Source: | Journal of physical chemistry. C, 126 (17) , p. 7456 -7467 | Abstract: | Electrocatalytic reduction of CO2 to CO in aqueous media offers an important path to more sustainable carbon utilization. Optimization of this process relies on a detailed understanding of the dynamics of boundary layer chemistry, e.g., pH, adjacent to the electrode, which is difficult to quantify without perturbing the system. In this work, a versatile IrOx pH-sensing thin film is fabricated on the ring of a rotating ring disk electrode (RRDE) to enable potentiometric boundary layer pH measurement under well-defined mass flow conditions. An analytical reaction-convection-diffusion model is used to translate ring measurements to the pH at the disk surface under reaction conditions. The measurements and model effectively capture the drastic pH shear on a Au electrode during hydrogen evolution reaction in a weak acid electrolyte. The pH trends are measured during CO2 reduction reaction in a 0.5 mol L-1 bicarbonate electrolyte, where the impact of buffering action is clearly demonstrated as a function of the rotation rate and RRDE geometry. The model and measurement provide a useful platform for further exploration of electrode kinetics influenced by reaction-induced pH change. | Notes: | Moffat, TP (corresponding author), NIST, Mat Sci & Engn Div, Gaithersburg, MD 20899 USA. thomas.moffat@nist.gov |
Document URI: | http://hdl.handle.net/1942/37682 | ISSN: | 1932-7447 | e-ISSN: | 1932-7455 | DOI: | 10.1021/acs.jpcc.2c01504 | ISI #: | WOS:000814854000012 | Rights: | 2022 American Chemical Society | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2023 |
Appears in Collections: | Research publications |
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