Electrocatalytic Oxidation of Formic Acid at Manganese Oxide Nanorods Modified Electrodes: Effect of Substrate

El‐Deab, Mohamed S.; Ohsaka, Takeo

doi:10.1016/s1452-3981(23)19607-6

Cited by 5 publications

(1 citation statement)

References 30 publications

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“…The summation of the two values (2.14 C) is far below the recorded Q of EGO (Q EG ) during the prolonged electrolysis (9.0 C). This marked difference points to the formation of other oxidation products, e.g., the oxidation of FA to CO 2 which might consume a significant part of (Q EG ): 84,85 HCOOH…”

Section: Ethylene Glycol Electro-oxidation (Ego)-figurementioning

confidence: 99%

EIS-Activity Correlation for the Electro-Oxidation of Ethylene Glycol at Nanoparticles-Based Electrocatalysts

El-Nowihy¹,

Mohammad²,

Sadek³

et al. 2019

J. Electrochem. Soc.

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Enhanced catalysis of ethylene glycol electro-oxidation (EGO) is reported at a ternary CoOx/NiOx/Pt catalyst in which Pt nanoparticles (nano-Pt), nickel oxide nanoflowers (nanoNiOx), and cobalt oxide nanoparticles (nano-CoOx); are respectively electrodeposited onto a glassy carbon (GC) substrate. The electrocatalytic activity of the catalyst toward EGO depends on the catalyst's composition, loading sequence and loading level besides the electrolyte's pH and temperature. A detailed morphological, compositional, and structural inspection for the catalyst is achieved by FE-SEM, energy dispersive X-ray spectroscopy, and X-ray diffraction, respectively. Cyclic voltammetry is employed to ensure the successful electrodeposition of the catalyst's ingredients and to assess its activity. The superiority of the CoOx/NiOx/Pt/GC catalyst over a series of catalysts employing different ingredients and/or deposition sequence is demonstrated. It supports a larger (ca. fourfold) oxidation peak current, and a significant (ca. -330 mV) negative shift in the onset potential of EGO together with a much more enhanced long-term stability toward continuous electrolysis when compared to the Pt catalyst. The novelty of this investigation extends to employing the electrochemical impedance spectroscopy (EIS) as a probe that provides important information about the reaction pathway of EGO. Interestingly, the maximum capacitance obtained at the CoOx/NiOx/Pt/GC catalyst (coincides with the EGO peak current) is fivefold higher than that obtained at the Pt/GC catalyst at -0.35 V vs. Ag/AgCl. Formic acid and oxalic acid were the major products of EGO, as revealed by high performance liquid chromatography.

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Section: Ethylene Glycol Electro-oxidation (Ego)-figurementioning

confidence: 99%