Study of Methanol Electro-Oxidation on Thin Nickel Films by Sampled Current Voltammetry

Salinas, Maria Paula; Crespo‐Yapur, D. Alfonso; Videa, Marcelo

doi:10.1149/10101.0011ecst

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…Furthermore, the use of some elimination functions can lead to distortions of the irreversible current, which could manifest in other particular contributions. (9,10). Increasing the scan rate an order of magnitude had a marginal effect on the height of the methanol oxidation peak.…”

Section: Resultsmentioning

confidence: 95%

“…The potential range on which methanol electro-oxidation takes place also favors other reactions that can proceed parallel to it, like oxygen evolution reaction (OER), and the formation of different NiOOH polymorphs (β and γ); all of them can play a role in the qualitative and quantitative characteristics of the voltammogram. Thus, separating the total current into its particular contributions can shed some light on the differences between the Ni films deposited by Salinas-Quezada (9). In this work, the oxidation of Type A and Type B Ni deposits, and the oxidation of methanol, were analyzed by ELSV to reveal mechanistic differences that could originate during the electrodeposition process.…”

Section: Ni(oh) 2 + Oh −mentioning

confidence: 99%

“…Deposits produced at a current density of 4.0 mA cm −2 presented the highest electrocatalytic activity. A follow-up work (9) showed that the results' reproducibility was strongly dependent on the electrode's roughness, additionally leading to materials that exhibited different electrochemical behavior, as evidenced by the voltammograms recorded in 1 M KOH + 0.5 M methanol, as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

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Elimination Voltammetry with Linear Scan (ELSV) Study of Methanol Electro-Oxidation on Galvanostatically Deposited Ni

et al. 2021

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Elimination voltammetry with linear scan (EVLS) is an analysis method that allows the decomposition of the measured current into its capacitive, diffusional, and kinetic contributions. This method was applied to study the electro-oxidation of methanol on nickel films deposited galvanostatically on gold. This analysis suggests a strong dependence of the NiOOH formation and methanol oxidation on the scan rate. According to the EVLS deconvolution, at high scan rates (> 100 mV s−1), the oxidation of Ni(OH)2 to NiOOH has a remarkable resemblance to a reaction that proceeds in an adsorbed state. Decreasing the scan rate results in qualitative changes of the particular currents, implying the occurrence of electrochemical processes that require a larger time scale (>0.5 s), like the formation of the water intercalated γ-NiOOH. For the methanol electro-oxidation process, the main contribution comes from the kinetic current; however, increasing the scan rate reveals a parallel diffusional process related to the oxygen evolution.

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Section: Resultsmentioning

confidence: 95%

Section: Ni(oh) 2 + Oh −mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Elimination Voltammetry with Linear Scan (ELSV) Study of Methanol Electro-Oxidation on Galvanostatically Deposited Ni

et al. 2021

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“…Later, Salinas-Quezada et al observed a dependency between the applied deposition current applied and the electrocatalytic activity of nickel films. When lower deposition current values were applied, 22-33 µA, the electrocatalytic activity favored methanol oxidation, and with higher deposition currents, 38-66 µA, OER was favored [181]. This was attributed to changes in the growth regime because, during this stage, the geometric area defines the diffusion field of metallic ions.…”

Section: Future Perspectivesmentioning

confidence: 99%

Nickel-Based Electrocatalysts for Water Electrolysis

et al. 2022

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Currently, hydrogen production is based on the reforming process, leading to the emission of pollutants; therefore, a substitute production method is imminently required. Water electrolysis is an ideal alternative for large-scale hydrogen production, as it does not produce any carbon-based pollutant byproducts. The production of green hydrogen from water electrolysis using intermittent sources (e.g., solar and eolic sources) would facilitate clean energy storage. However, the electrocatalysts currently required for water electrolysis are noble metals, making this potential option expensive and inaccessible for industrial applications. Therefore, there is a need to develop electrocatalysts based on earth-abundant and low-cost metals. Nickel-based electrocatalysts are a fitting alternative because they are economically accessible. Extensive research has focused on developing nickel-based electrocatalysts for hydrogen and oxygen evolution. Theoretical and experimental work have addressed the elucidation of these electrochemical processes and the role of heteroatoms, structure, and morphology. Even though some works tend to be contradictory, they have lit up the path for the development of efficient nickel-based electrocatalysts. For these reasons, a review of recent progress is presented herein.

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Nickel Based Electrocatalysts for Water Electrolysis

Angeles-Olvera¹,

Crespo‐Yapur²,

Rodríguez³

et al. 2022

Preprint

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Current hydrogen production is based on the reforming process leading to the emission of pollutants; therefore, a substitute production method is imminently required. Water electrolysis is an ideal alternative for large-scale hydrogen production, as it does not produce any carbon-based pollutant byproducts. Production of green hydrogen from water electrolysis using intermittent sources (e.g., solar, eolic) would facilitate clean energy storage. However, the electrocatalysts currently required for water electrolysis are noble metals, making this potential option expensive and inaccessible for industrial applications. Therefore, there is a need to develop electrocatalysts based on earth-abundant and low-cost metals. Nickel-based electrocatalysts are a fitting alternative because they are economically accessible. Extensive research has focused on developing nickel-based electrocatalysts for hydrogen and oxygen evolution. Theoretical and experimental work have addressed the elucidation of these electrochemical processes and the role of heteroatoms, structure, and morphology. Even though some works tend to be contradictory, they have lit up the path for efficient nickel-based electrocatalysts. For these reasons, herein, a review of recent progress is presented.

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Study of Methanol Electro-Oxidation on Thin Nickel Films by Sampled Current Voltammetry

Cited by 3 publications

References 9 publications

Elimination Voltammetry with Linear Scan (ELSV) Study of Methanol Electro-Oxidation on Galvanostatically Deposited Ni

Elimination Voltammetry with Linear Scan (ELSV) Study of Methanol Electro-Oxidation on Galvanostatically Deposited Ni

Nickel-Based Electrocatalysts for Water Electrolysis

Nickel Based Electrocatalysts for Water Electrolysis

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