Over-faradaic hydrogen production in methanol electrolysis cells

Ruiz-López, Estela; Caravaca, A.; Vernoux, P.; Dorado, Fernando; Lucas-Consuegra, A. de

doi:10.1016/j.cej.2020.125217

Cited by 35 publications

(26 citation statements)

References 48 publications

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“…41,43 A similar promotion effect was also observed in a liquid phase for the H 2 + O 2 reaction, demonstrating the applicability of NEMCA to various reactions. [44][45][46][47] In a distinct mechanism, externally applying electric potentials onto the catalyst tunes its WF as in the electrochemical process, and facilitates the formation or consumption of the surface adsorbate that is otherwise considerably slow in the thermal-catalytic manner. [48][49][50][51] More specically, a change in the WF of the solid catalyst leads to subsequent alteration of its binding energy to surface species, and thereby the adsorption energy is changed.…”

Section: Approaches To Alter the Potential Of A Solid Catalyst For Hementioning

confidence: 99%

Determination and perturbation of the electronic potentials of solid catalysts for innovative catalysis

Kishimoto

Takanabe

2021

Chem. Sci.

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Section: Approaches To Alter the Potential Of A Solid Catalyst For Hementioning

confidence: 99%

Determination and perturbation of the electronic potentials of solid catalysts for innovative catalysis

Kishimoto

Takanabe

2021

Chem. Sci.

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“…PEM electrolysers and SOE technologies are mature, easy to scale up in stacks, allowing to polarize a catalyst-electrode and then to implement EPOC. The idea, recently proposed in the literature [133,134], is to couple the electrolysis process with an electropromoted catalytic reaction at the cathode that can produce extra hydrogen.…”

Section: Coupling Electrolysis and Epocmentioning

confidence: 99%

“…Our group in collaboration with the University of Castilla-La Mancha recently operated EPOC in a low temperature methanol/water electrolyser with Pt-C/(OH --polymeric membrane)/Pd-C (anode/electrolyte/cathode). Methanol was used as a model representative of alcohol molecules [134]. In this case, instead of a SOE electrolyser, we used a polymer electrolyte membrane (PEM) configuration.…”

Section: Epoc In Depolarized Pem Electrolysersmentioning

confidence: 99%

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A Discussion on the Unique Features of Electrochemical Promotion of Catalysis (EPOC): Are We in the Right Path Towards Commercial Implementation?

2020

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The phenomenon of “Non-Faradaic Electrochemical Modification of Catalytic Activity (NEMCA)” or “Electrochemical Promotion of Catalysis (EPOC)” has been extensively studied for the last decades. Its main strength, with respect to conventionally promoted catalytic systems, is its capability to modify in-situ the activity and/or selectivity of a catalyst by controlling the supply and removal of promoters upon electrical polarization. Previous reviews have summarized the main achievements in this field from both the scientific and technological points of view. However, to this date no commercial application of the EPOC phenomenon has been developed, although numerous advances have been made on the application of EPOC on catalyst nanostructures (closer to those employed in conventional catalytic systems), and on the development of scaled-up reactors suitable for EPOC application. The main bottleneck for EPOC commercialization is likely the choice of the right chemical process. Therefore, from our point of view, future efforts should focus on coupling the latest EPOC advances with the chemical processes where the EPOC phenomenon offers a competitive advantage, either from an environmental, a practical or an economic point of view. In this article, we discuss some of the most promising cases published to date and suggest future improvement strategies. The considered processes are: (i) ethylene epoxidation with environmentally friendly promoters, (ii) NOx storage and reduction under constant reaction atmosphere, (iii) CH4 steam reforming with in-situ catalyst regeneration, (iv) H2 production, storage and release under fixed temperature and pressure, and (v) EPOC-enhanced electrolysers.

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“…[2] Nowadays, H 2 is produced mainly from reforming of methane, which accounts for %96%, while steam reforming requires severe reaction conditions (high temperature: %800 C) and emits a high amount of CO 2 and other toxic wastes and attains low purity of H 2 , severely unfavorable for its applications. [10][11][12] Other conventional industrial processes for H 2 generation through organic (methanol, ethanol) oxidation generally also require high temperature and pressure, which suffer high energy consumption and stringent equipment requirements. [13] As an alternative energy source, H 2 has numerous advantages, but its production, storage, transportation, and industrial application face many challenges.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Hydrogen Generation by Oxygen Evolution Reaction‐Alternative Anodic Oxidation Reactions

Liu

Han

Guo

et al. 2022

Adv Energy and Sustain Res

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Hydrogen (H2) as an environmentally friendly and sustainable energy carrier has been regarded as one of the most promising alternatives to carbon‐based fossil fuels. Electrochemical water splitting powered by renewable electricity provides a promising strategy for H2 production, but its energy efficiency is strongly limited by the kinetically sluggish anodic oxygen evolution reaction (OER), which consumes ≈90% electricity in the water‐splitting process. A new strategy is urgently needed to reduce its energy consumption. Small‐molecule electro‐oxidation reactions that replace OER have attracted increasing attention due to the advantages of low theoretical thermodynamic potential and the benefit of producing value‐added chemicals compared with OER. Hybrid electrolysis systems, by coupling cathodic hydrogen evolution reaction (HER) with anodic small‐molecule oxidation reactions, have been proposed, which can produce high‐purity H2 and value‐added products. This review aims to systematically summarize the recent research on OER‐alternative reactions at the anode for energy‐efficient water splitting. The state‐of‐the art electrocatalysts for OER‐alternative reactions are first presented. The electrolysis performance in hybrid electrolysis regarding the conversion rate, selectivity, yield, and corresponding Faraday efficiency of anodic value‐added products is then evaluated. Finally, the challenges and perspectives are discussed and it is suggested to develop energy‐efficient and economically viable hybrid electrolysis systems.

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Over-faradaic hydrogen production in methanol electrolysis cells

Cited by 35 publications

References 48 publications

Determination and perturbation of the electronic potentials of solid catalysts for innovative catalysis

Determination and perturbation of the electronic potentials of solid catalysts for innovative catalysis

A Discussion on the Unique Features of Electrochemical Promotion of Catalysis (EPOC): Are We in the Right Path Towards Commercial Implementation?

Electrochemical Hydrogen Generation by Oxygen Evolution Reaction‐Alternative Anodic Oxidation Reactions

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