4, 4′-Bipyridine as a molecular catalyst for electrochemical hydrogen production

Uchida, Tatsuo; Sasaki, Yōichi; Ikeshoji, Tamio; Osawa, Masatoshi

doi:10.1016/j.electacta.2017.07.101

Cited by 5 publications

(5 citation statements)

References 52 publications

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“…Two reduction peaks were found to appear with CO 2 system (Figure a). The peak observed at ‐E cat =−1.14 V was for the H 2 evolution reaction (HER), and the peak observed at ‐E cat =−1.80 V was for ERC with an onset potential of −1.20 V at complex 1 /graphite WE (Figure a) . To note, Cu porphyrin complex coated over carbon fiber also exhibited a close reduction potential (−0.98 V vs. RHE) in 0.5 M KHCO 3 media producing C 2 H 4 , CH 4 , and CO with FE of 54 % in ERC …”

Section: Resultsmentioning

confidence: 93%

“…The peak observed at -E cat = À 1.14 V was for the H 2 evolution reaction (HER), and the peak observed at -E cat = À 1.80 V was for ERC with an onset potential of À 1.20 V at complex 1/graphite WE (Figure 2a). [27] To note, Cu porphyrin complex coated over carbon fiber also exhibited a close reduction potential (À 0.98 V vs. RHE) in 0.5 M KHCO 3 media producing C 2 H 4 , CH 4 , and CO with FE of 54 % in ERC. [28] [Cu II (L NH 2 )] (complex 1) showed a notable peak separation of ERC and HER, which is considered as one of the primary shortcomings of many metals and metal oxides catalyzed ERC systems.…”

Section: Metal Complex Characterizationmentioning

confidence: 87%

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Reduction of CO₂ to Value‐Added Products on a Cu(II)‐Salen Complex Coated Graphite Electrocatalyst

2020

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This work synthesizes a four‐coordinate Cu(II) complex {[CuII(LNH2)]; 1} of the tetradentate H2LNH2 ligand. The synthesized complex acted as an electrocatalyst for the CO2 conversion towards C1 and C2 products by activating the stable C−O bond. The catalyst ink (complex 1+DMF+Nafion; catalyst concentration ∼2 mg cm−2) was surface‐coated over the graphite plate to carry out the reduction reaction in a three‐electrode electrochemical system. An H‐type electrolyzer was employed in 0.5 M KHCO3 electrolyte solution at neutral pH in the carbonated system. A maximum amount of 36 % FE was achieved at −1.80 V vs. Ag/AgCl for 60 min of reaction. The total TON and TOF of the catalyst were calculated to be 9230 and 2.6 s−1, respectively. The CO2‐reduced products were obtained as HCOOH>CH3COOH>CH3OH>C2H5OH, which were formed through multiple–electrons transfer (2 e− to 12 e−) proton‐insertion reactions. The catalytic activity of the Cu(II) complex was enhanced by the presence of the terminal ‐NH2 anchoring‐group in the ligand backbone. The fact was confirmed by electrocatalytic CO2 conversion experiments in the presence of complex 2 {[CuII(L)]; 2} as the electrocatalyst, which did not contain the anchoring group in the salen ligand structure.

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Section: Resultsmentioning

confidence: 93%

Section: Metal Complex Characterizationmentioning

confidence: 87%

Reduction of CO₂ to Value‐Added Products on a Cu(II)‐Salen Complex Coated Graphite Electrocatalyst

2020

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“…Specifically, optimizing the interactions of the right cations with step sites in Pt-based electrodes can maximize the HER activity in alkaline conditions . In addition, it has been demonstrated that some organic molecules enhance the rate of the HER in both neutral and alkaline environments. , …”

Section: Introductionmentioning

confidence: 99%

“…21 In addition, it has been demonstrated that some organic molecules enhance the rate of the HER in both neutral and alkaline environments. 22,23 This article is licensed under CC-BY 4 Tetraalkylammonium cations (TAA + ) are known to enhance electroreduction reactions. 24 Recently, TAA + cations have been shown to have a substantial impact on the alkaline HER kinetics on polycrystalline Pt electrodes.…”

Section: ■ Introductionmentioning

confidence: 99%

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Effect of a Physisorbed Tetrabutylammonium Cation Film on Alkaline Hydrogen Evolution Reaction on Pt Single-Crystal Electrodes

Fernández-Vidal,

Koper

2024

ACS Catal.

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The addition of tetrabutylammonium (TBA+) to alkaline electrolytes enhances the hydrogen evolution reaction (HER) activity on Pt single-crystal electrodes. The concentration of TBA+ significantly influences the HER on Pt(111). Concentrations of ≤1 mM yield no significant effect on HER currents or the coverage of adsorbed hydrogen (H*) but exhibit an interaction with the OHads on the surface. Conversely, concentrations of >1 mM result in an apparent site-blocking effect for underpotential-deposited H* caused by the physisorption of the organic cation, which counterintuitively leads to an increase in the HER activity. The physisorption of TBA+ is linked to its accumulation in the diffuse layer, as it can be reversibly removed by the addition of nonadsorbing cations such as sodium. Following the previous literature on the TBA+ interaction with electrode surfaces, we ascribe this effect to the formation of a two-dimensional TBA+ film in the double layer. On stepped Pt single-crystal surfaces, TBA+ enhances HER activity at all concentrations, primarily at step sites. Our findings not only highlight the complexities of TBA+ accumulation on Pt electrodes but also offer important molecular-level insights for optimizing the HER by organic film formation on various atomic-level electrode structures.

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Cation influence of new imidazolium-based ionic liquids on hydrogen production from water electrolysis

Zanchet

Trindade

Lima

et al. 2018

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4, 4′-Bipyridine as a molecular catalyst for electrochemical hydrogen production

Cited by 5 publications

References 52 publications

Reduction of CO₂ to Value‐Added Products on a Cu(II)‐Salen Complex Coated Graphite Electrocatalyst

Reduction of CO₂ to Value‐Added Products on a Cu(II)‐Salen Complex Coated Graphite Electrocatalyst

Effect of a Physisorbed Tetrabutylammonium Cation Film on Alkaline Hydrogen Evolution Reaction on Pt Single-Crystal Electrodes

Cation influence of new imidazolium-based ionic liquids on hydrogen production from water electrolysis

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4, 4′-Bipyridine as a molecular catalyst for electrochemical hydrogen production

Cited by 5 publications

References 52 publications

Reduction of CO2 to Value‐Added Products on a Cu(II)‐Salen Complex Coated Graphite Electrocatalyst

Reduction of CO2 to Value‐Added Products on a Cu(II)‐Salen Complex Coated Graphite Electrocatalyst

Effect of a Physisorbed Tetrabutylammonium Cation Film on Alkaline Hydrogen Evolution Reaction on Pt Single-Crystal Electrodes

Cation influence of new imidazolium-based ionic liquids on hydrogen production from water electrolysis

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Reduction of CO₂ to Value‐Added Products on a Cu(II)‐Salen Complex Coated Graphite Electrocatalyst

Reduction of CO₂ to Value‐Added Products on a Cu(II)‐Salen Complex Coated Graphite Electrocatalyst