Method for studying high temperature aqueous electrochemical systems: Methanol and glycerol oxidation

Holm, Thomas R.; Dahlstrøm, Per Kristian; Burheim, Odne Stokke; Sunde, Svein; Harrington, David A.; Seland, Frode

doi:10.1016/j.electacta.2016.11.130

Cited by 14 publications

(13 citation statements)

References 81 publications

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“…Experimentally, the onset potential tested from CV represents the potential where the oxidation reaction starts to occur, although there is yet no commonly accepted consensus about the exact mathematical definition for onset potential, it is mostly provided as an approximate value by observing the CV curves (eyeballing or so-called de visu) and it is also suggested to provide magnified plot in the low overpotential and low current region for fair and clear comparison. [83] Some literature defines the potential to reach a certain mass normalized current of 0.1 A mg −1 [36] or geometric current density of 0.1 mA cm −2 (Figure 3c) [84] as the onset potential. However, these definitions may also lead to unfair comparisons when comparing electrocatalysts with large differences in MA or geometric current density, therefore, some literature also suggests defining onset potential as the potential at which 5% of the peak current is achieved.…”

Section: Durabilitymentioning

confidence: 99%

Noble Metal Based Electrocatalysts for Alcohol Oxidation Reactions in Alkaline Media

Wan

Huang

et al. 2022

Adv Funct Materials

101

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Alkaline direct alcohol fuel cells (ADAFCs) represent an attractive alternative to hydrogen fuel cells for the more convenient storage, transportation, and lower cost of alcohols (e.g., methanol and ethanol) when compared with compressed hydrogen. However, the anode alcohol oxidation reaction (AOR) is generally plagued with high overpotential and sluggish kinetics, and often requires noble metal-based electrocatalysts to accelerate the reaction kinetics. To this end, the development of efficient AOR electrocatalysts with high mass activity (MA), high durability, high Faradaic efficiency (FE), and low overpotential is central for realizing practical ADAFCs. Here, in this minireview, a brief introduction of the fundamental challenges associated with AOR in alkaline electrolyte, the key performance metrics, and the evaluation protocols for benchmarking AOR electrocatalysts are presented, followed by a summary of the recent advances in the noble-metal based AOR electrocatalysts (e.g., Pt, Pd, and Rh) with an emphasis on the design criteria for improving the specific activity and electrochemical surface area to ultimately deliver high MA while at the same time ensuring long term durability. The strategies to enhance FE and lower overpotential will also be discussed. Last, it is concluded with a brief perspective on the key challenges and future opportunities.

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Section: Durabilitymentioning

confidence: 99%

Noble Metal Based Electrocatalysts for Alcohol Oxidation Reactions in Alkaline Media

Wan

Huang

et al. 2022

Adv Funct Materials

101

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“…A commercially available autoclave (BüchiGlasUster AG) was custom tted for electrochemical experiments as described in previous work [16,17]. The experimental procedure is explained in the previous work on this system [13].…”

Section: Conventional Electrochemistrymentioning

confidence: 99%

Dynamic electrochemical impedance study of methanol oxidation at Pt at elevated temperatures

Holm

Dahlstrøm

Sunde

et al. 2019

Electrochimica Acta

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Data from a combined cyclic voltammetry and dynamic electrochemical impedance spectroscopy (dEIS) study of the methanol oxidation reaction (MOR) at high temperatures was revisited using a new method for mechanistic modeling. Through iterative optimization of kinetic parameters, a total of ve reaction mechanisms of the indirect pathway of the MOR were modeled. The calculated dEIS spectra from the kinetic parameters were used to verify the reaction mechanisms and best ts were found where i) water adsorption is reversible and hinders the MOR at lower potentials (< 0.50 V vs RHE), and ii) the surface reaction between adsorbed CO and OH is chemical.

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“…The electrocatalytic activity toward AOR is undoubtedly enhanced under a higher temperature. [149][150][151][152][153] However, the elevating temperature will cause severe catalyst aggregation and metal leaching, which lower the catalyst stability. Together with the energy waste, the extra heating method is not popular.…”

Section: Assisted From Other Energiesmentioning

confidence: 99%

“…Taken heating the reaction system as an example, temperature increase will facilitate to electrocatalytic AOR from kinetic respect. The electrocatalytic activity toward AOR is undoubtedly enhanced under a higher temperature [149–153] . However, the elevating temperature will cause severe catalyst aggregation and metal leaching, which lower the catalyst stability.…”

Section: Advanced Strategies For High‐performance Aor Electrocatalystsmentioning

confidence: 99%

Platinum‐Based Electrocatalysts for Direct Alcohol Fuel Cells: Enhanced Performances toward Alcohol Oxidation Reactions

Zhao

Fang

et al. 2021

ChemPlusChem

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Figure 2. a) Average size of Pt nanoparticles prepared under different pH values. [51] b) SA and MA values of commercial Pt/C and Pt nanoparticles with various sizes toward EGOR. [51] Reproduced from Ref. [51] with permission. Copyright (2020) Elsevier. c) Size distribution of Pt cluster treated at different temperatures. [52] d) CV curves for MOR of a monolayer single Pt atoms on the thiolated multiwalled carbon nanotube (PtÀ S-MWNT), Pt clusters on multiwalled carbon nanotubes with eliminated thiol at different temperature

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Method for studying high temperature aqueous electrochemical systems: Methanol and glycerol oxidation

Cited by 14 publications

References 81 publications

Noble Metal Based Electrocatalysts for Alcohol Oxidation Reactions in Alkaline Media

Noble Metal Based Electrocatalysts for Alcohol Oxidation Reactions in Alkaline Media

Dynamic electrochemical impedance study of methanol oxidation at Pt at elevated temperatures

Platinum‐Based Electrocatalysts for Direct Alcohol Fuel Cells: Enhanced Performances toward Alcohol Oxidation Reactions

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