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Title: | Nitrogen containing carbon spheres as an efficient electrocatalyst for oxygen reduction: microelectrochemical investigation and visualization |
Authors: | Tiwari, A. Singh, V. Mandal, D. Nagaiah, T. C. |
Issue Date: | 13-Oct-2021 |
Abstract: | The oxygen reduction reaction (ORR) in low temperature fuel cells limits the obtainable output triggering the necessity of screening the employable catalysts precisely. A nitrogen-containing carbon sphere (NCS) catalyst was synthesized using a soft template and was studied for the oxygen reduction reaction. The NCS catalyst was shown to have superior activity with an onset potential of 0.985 V (vs. RHE) and a diffusion-limited current density of 6.16 mA cm 2 . The kinetic insight from the rotating disk electrode (RDE) and rotating ring-disk electrode (RRDE) revealed an overall 4e reduction by a (2 + 2) electron pathway with a rate constant of 4.6 10 4 cm s 1 at the onset potential. A fast screening of the localized electrochemical activity using sample generation-tip collection (SG-TC) in combination with a chronoamperometric multiple pulse technique was applied in the present study to trace the formation, evolution and conversion of intermediate species using a Pt ultramicroelectrode. The local catalytic activity of the NCS catalyst was successfully visualized by scanning electrochemical microscopy (SECM) in highly alkaline medium. |
URI: | http://localhost:8080/xmlui/handle/123456789/3023 |
Appears in Collections: | Year-2017 |
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