Reduced CO2 on polycrystalline Pd and Pt electrodes in neutral solution: electrochemical and in situ Fourier transform IR studies

Taguchi, Satoshi; Aramata, Akiko; Enyo, M.

doi:10.1016/0022-0728(93)03287-y

Cited by 51 publications

(41 citation statements)

References 40 publications

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“…Copper has attracted special attention [1,2,[7][8][9][10][11], due to its exceptional selectivity for CO 2 conversion to hydrocarbons and alcohols at significant current densities. On the other hand, metals of the group VIII elements, such as Pt and Pd, have been also studied in detail by several authors [12][13][14][15][16][17][18][19][20][21][22][23][24], since these electrodes present low hydrogen overpotentials and easily adsorb hydrogen. Adsorbed hydrogen favor the adsorption of species derived from CO 2 on the electrode surface, since the formation of "reduced CO 2 " adsorbates requires interaction between CO 2 molecules and adsorbed hydrogen [12,13,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Pd catalysts supported onto nanostructured carbon materials for CO2 valorization by electrochemical reduction

Pérez-Rodríguez

Rillo

Lázaro

et al. 2015

Applied Catalysis B: Environmental

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Pd nanoparticles have been supported onto different novel carbon materials to be used in the electroreduction of CO 2 to high-added value products. Carbon nanocoils (CNCs), carbon nanofibers (CNFs) and ordered mesoporous carbon materials (OMCs) have been studied as support of the catalysts. In addition, Pd catalyst supported onto Vulcan XC-72R has been synthesized in order to establish a comparison with the commercial support. In this way, the influence of the carbon material on the physicochemical and electrochemical properties of the catalysts for the CO 2 electroreduction process can be analyzed. Supports presented different morphologies and structures. CNFs and CNCs exhibited a crystalline structure with well-aligned graphitic layers and OMCs a hexagonal ordered structure composed of not crystalline carbon. Finally, Vulcan presented an intermediate structure between amorphous and graphitic. These differences do not affect significantly the average Pd crystallite size, although a different metal dispersion was found depending on the carbon material. On the other hand, cyclic voltammetry studies showed that CO 2 was effectively reduced to other species at the surface of Pd/C catalysts. Additionally, it was proved that these species were adsorbed onto Pd at-1.0 V vs Ag/AgCl. Finally, a different catalytic activity towards the CO 2 reduction reaction was observed for the different electrocatalysts, indicating an influence of the carbon support.

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Section: Introductionmentioning

confidence: 99%

Pd catalysts supported onto nanostructured carbon materials for CO2 valorization by electrochemical reduction

Pérez-Rodríguez

Rillo

Lázaro

et al. 2015

Applied Catalysis B: Environmental

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“…Based on the nature of the most abundant reaction products, monometallic electrocatalysts are traditionally classified in four groups (Figure A): a) The first category includes metals such as Pt, Ni, Rh, and Ir, which are highly active towards the hydrogen evolution reaction (HER), but show negligible activity for CO 2 reduction . b) The second group encompasses metals like Cd, Pb, and Sn, which show excellent selectively (near 100 % Faradaic Efficiency) toward formic acid (HCOOH) production .…”

Section: Structure Sensitivity In Co2 Reductionmentioning

confidence: 99%

“…Based on the nature of the most abundant reaction products, monometallic electrocatalysts are traditionally classified in four groups ( Figure 1A): [9] a) The first category includes metals such as Pt, Ni, Rh, and Ir, which are highly active towards the hydrogen evolution reaction (HER), but show negligible activity for CO 2 reduction. [47] b) The second group encompasses metals like Cd, Pb, and Sn, which show excellent selectively (near 100 % Faradaic Efficiency) toward formic acid (HCOOH) production. [48] c) The third group of metals, which includes Ag, Au, and Zn, mostly produces CO. [14,48] d) Copper stands out as the only monometallic catalyst capable to further reduce adsorbed CO to hydrocarbons and a wide range of oxygenated species with appreciable rates ( Figure 1B), [37] while other common transition metals are known to produce only traces or negligible amounts of hydrocarbons and alcohols.…”

Section: Structure Sensitivity In Co 2 Reductionmentioning

confidence: 99%

Structure‐Sensitivity and Electrolyte Effects in CO₂ Electroreduction: From Model Studies to Applications

et al. 2019

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Aiming to reduce anthropogenic CO2 emissions, there is an urgent demand to develop more efficient and affordable technologies which convert CO2 into valuable feedstock molecules. The use of renewable electricity is a promising and sustainable approach to overcome this environmental issue, while producing valuable chemicals and clean fuels. However, the CO2 electroreduction reaction (CO2RR) still shows two main gaps: poor selectivity and required large overpotentials make the process not profitable enough. To overcome these challenges, model studies on single‐crystalline surfaces aiming to find the relations between surface structure/electrolyte interactions and activity/selectivity are necessary. In these model studies, tuning the electrolyte composition is also key for the fundamental understanding of the CO2RR. In this review, we first discuss the structure‐activity‐selectivity relations from studies on well‐ordered surfaces, i. e., single crystalline electrodes, for the CO2RR. We then summarise the role of the electrolyte, presenting work on classical aqueous solvents as well as non‐aqueous electrolytes such as ionic liquids. We illustrate the importance of carrying out studies on well‐defined electrified interfaces in order to get deep fundamental insights on the mechanism of the CO2RR, as well as scaling the process for real applications. Ultimately, this knowledge will be essential to rationally design the catalyst with tailored activity and selectivity for CO2 reduction.

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“…Consequently, an effective catalyst for CO2 reduction should be able to suppress the HER so that all the adsorbed hydrogen will be consumed only by CO2 reduction and the subsequent hydrogenation to reduced species. Pt electrodes have been widely studied due to their great ability to adsorb hydrogen (low hydrogen overpotential) [6,7]. However, only traces of reduction products were generally detected and hydrogen was the main product [12,63].…”

Section: Electrochemical Activity Toward Hydrogen Evolution Reactionmentioning

confidence: 99%

“…Efficient catalysts for CO2 reduction should provide both the activation of CO2 and the subsequent hydrogenation to reduced species. For this reason, metals with low hydrogen overpotentials, such as Pt and Pd, have been widely used since these materials adsorb easily hydrogen [4][5][6][7]. Adsorbed hydrogen favours the adsorption of species derived from CO2 on the electrode surface, since the formation of "reduced CO2" adsorbates requires interaction between CO2 molecules and adsorbed hydrogen [4,5,7].…”

Section: Introductionmentioning

confidence: 99%

Noble metal-free catalysts supported on carbon for CO 2 electrochemical reduction

Pérez-Rodríguez

Pastor

Lázaro

2017

Journal of CO2 Utilization

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In the present work, a wide variety of electrocatalysts, involving different metals, synthesis routes and oxidation states, have been prepared and the response towards the CO2 reduction on carbon-supported established. In particular, catalysts based on non-noble metals (Cu, Co, Fe and Ni) supported on carbon black (Vulcan XC-72R) were tested in the electrochemical reduction of CO2. Amorphous oxides of magnetite/maghemite and crystalline CuO and Cu2O oxides obtained by different methodologies were also studied. Previously, the efficiency of the catalysts for the hydrogen formation was evaluated in 0.1M NaHCO3 since it takes place as a competitive reaction during CO2 reduction in aqueous electrolytes. By comparison of the voltammograms in the absence and presence of CO2, an inhibition of the hydrogen evolution was showed for all (metal and oxide-based) catalysts due to the adsorption of species from CO2 reduction (CO2,red). Interestingly, the CO2,red formation on Co and Fesurfaces operating under these conditions has not been stated before. A strong current decrease, and consequently, a higher adsorbate amount, was observed on copper-oxides (75-85 %) vs. the metal catalyst (45 %).

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Reduced CO2 on polycrystalline Pd and Pt electrodes in neutral solution: electrochemical and in situ Fourier transform IR studies

Cited by 51 publications

References 40 publications

Pd catalysts supported onto nanostructured carbon materials for CO2 valorization by electrochemical reduction

Pd catalysts supported onto nanostructured carbon materials for CO2 valorization by electrochemical reduction

Structure‐Sensitivity and Electrolyte Effects in CO₂ Electroreduction: From Model Studies to Applications

Noble metal-free catalysts supported on carbon for CO 2 electrochemical reduction

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Reduced CO2 on polycrystalline Pd and Pt electrodes in neutral solution: electrochemical and in situ Fourier transform IR studies

Cited by 51 publications

References 40 publications

Pd catalysts supported onto nanostructured carbon materials for CO2 valorization by electrochemical reduction

Pd catalysts supported onto nanostructured carbon materials for CO2 valorization by electrochemical reduction

Structure‐Sensitivity and Electrolyte Effects in CO2 Electroreduction: From Model Studies to Applications

Noble metal-free catalysts supported on carbon for CO 2 electrochemical reduction

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Product

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Structure‐Sensitivity and Electrolyte Effects in CO₂ Electroreduction: From Model Studies to Applications