Nanoporous Gold Surface: An Efficient Platform for Hydrogen Evolution Reaction at Very Low Overpotential

Sukeri, Anandhakumar; Bertotti, Mauro

doi:10.21577/0103-5053.20170132

Cited by 27 publications

(37 citation statements)

References 38 publications

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“…S5. Such a change in color has been reported recently for the reduction of Au 2 O 3 to metallic Au, 63 and the black color has been attributed to the ability of the nanostructured Au surface to absorb significantly the incident light from the visible spectrum. 64,65 Comparing the CV of an as-prepared Au wire electrode (Fig.…”

Section: Ausupporting

confidence: 63%

Structural Evolution of Pt, Au, and Cu Anodes by Electrolysis up to Contact Glow Discharge Electrolysis in Alkaline Electrolytes

Artmann¹,

Menezes²,

Forschner³

et al. 2021

Preprint

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<div>Applying a voltage to metal electrodes in contact with aqueous electrolytes results in the electrolysis of water at low voltages and plasma formation in the electrolyte at high voltages referred to as contact glow discharge electrolysis (CGDE). While several studies explore parameters that lead to changes in the I-U characteristics in this voltage range, little is known about the evolution of the structural properties of the electrodes. Here we study this aspect on materials essential to electrocatalysis, namely Pt, Au, and Cu. The stationary I-U characteristics are almost identical for all electrodes. Detailed structural characterization by optical microscopy, scanning electron microscopy, and electrochemical approaches reveal that Pt is stable during electrolysis and CGDE, while Au and Cu exhibit a voltage-dependent oxide formation. More importantly, oxides are reduced when the Au and Cu electrodes are kept in the electrolysis solution. We suspect that H<sub>2</sub>O<sub>2 </sub>(formed during electrolysis) is responsible for the oxide reduction. The reduced oxides (which are also accessible <i>via</i> electrochemical reduction) form a porous film, representing a possible new class of materials in energy storage and conversion studies.</div>

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Section: Ausupporting

confidence: 63%

Structural Evolution of Pt, Au, and Cu Anodes by Electrolysis up to Contact Glow Discharge Electrolysis in Alkaline Electrolytes

Artmann¹,

Menezes²,

Forschner³

et al. 2021

Preprint

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“…If the Volmer step is the rate limiting step, the Tafel slope should be close to 120 mVdec −1 [53] . However, if the Heyrovsky or Tafel step dictate the rate, the Tafel slope will be ∼40 mVdec −1 or ∼30 mVdec −1 , respectively [53,54] . However, a wide range of Tafel slopes have been reported for different catalysts, often deviating widely from those values [55] .…”

Section: Resultsmentioning

confidence: 99%

Layered Oxides SrLaFe_1‐xCo_xO_4‐δ (x=0–1) as Bifunctional Electrocatalysts for Water‐Splitting

Alom

Ramezanipour

2021

ChemCatChem

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Multifunctional materials that are capable of facilitating multiple electrocatalytic processes are highly desirable. This work reports the observation of bifunctional electrocatalytic properties for water‐splitting in layered oxides, featuring 2‐dimensional layers of octahedrally coordinated transition metals separated by alkaline‐earth or rare‐earth metals. Remarkably, these materials are able to catalyze both half‐reactions of water‐splitting, i. e., oxygen‐evolution reaction (OER) and hydrogen‐evolution reaction (HER). Electrical charge‐transport studies of SrLaFe1‐xCoxO4‐δ in a wide range of temperatures, 25 to 800 °C, indicate semiconducting behavior for all three compounds, where there is a systematic increase in electrical conductivity as a function of temperature. The end member of the series, SrLaCoO4‐δ, exhibits the highest electrical charge transport and best electrocatalytic activity toward both OER and HER. This catalyst also features the highest degree of polyhedral distortion as well as the presence of oxygen‐vacancies. In addition, the transition metals in this material have a favorable electronic configuration for enhanced electrocatalytic activity.

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“…The obtained exchange current density values surpass a number of those formerly reported in literature such as, 8.32 × 10 −9 mA cm −2 for the aforementioned Au-MWCCE [ 59 ]; 1.92 × 10 −3 mA cm −2 for N-doped carbon coated Co–Ni alloy with reduced graphene oxide decoration (CoNi@N-C/rGO) [ 65 ]; 0.017 mA cm −2 for hierarchical β-Mo 2 C nanotubes [ 49 ]; 9.2 × 10 −4 mA cm −2 for cocoon-like molybdenum sulfide nanostructures (MoS 2 -Mo-1h) [ 66 ]; 5.9 × 10 −5 mA cm −2 for CoTe 2 nanoparticles [ 47 ]; and 0.017 mA cm −2 reported for Pd-modified carbon fibre electrode [ 67 , 68 ]. The value of 0.35 mA cm −2 for DS_1h exceeds that of 0.13 mA cm −2 for aforementioned rGO-Au 48 Pd 52 [ 57 ] and 0.126 mA cm −2 for nanostructured porous gold film [ 69 ]. Figure 11 c illustrates the LSV polarization curves of SS_HF and DS_1h after 500 cycles of potential scans showing their efficient durability.…”

Section: Resultsmentioning

confidence: 99%

Nanostructured Molybdenum Oxides from Aluminium-Based Intermetallic Compound: Synthesis and Application in Hydrogen Evolution Reaction

et al. 2021

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Characterized by a large surface area to volume ratio, nanostructured metal oxides possess unique chemical and physical properties with applications in electronics, catalysis, sensors, etc. In this study, Mo3Al8, an intermetallic compound, has been used as a precursor to obtain nanostructured molybdenum oxides. It was prepared into ribbons by arc-melting and melt-spinning techniques. Single and double-step free corrosion of the as-quenched material have been studied in 1 M KOH, 1 M HF and 1.25 M FeCl3 at room temperature. In both cases, nanostructured molybdenum oxides were obtained on a surface layer a few microns thick. Two of the as-prepared samples were tested for their electrocatalytic capability for hydrogen evolution reaction (HER) in 0.5 M H2SO4 giving low onset potential (−50 mV, −45 mV), small Tafel slopes (92 mV dec−1, 9 mV dec−1) and high exchange current densities (0.08 mA cm−2, 0.35 mA cm−2 respectively). The proposed nanostructured molybdenum oxides are cost-effective and sustainable due to the cheap and abundant starting material used and the simple synthetic route, paving the way for their possible application as HER electrocatalysts.

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Nanoporous Gold Surface: An Efficient Platform for Hydrogen Evolution Reaction at Very Low Overpotential

Cited by 27 publications

References 38 publications

Structural Evolution of Pt, Au, and Cu Anodes by Electrolysis up to Contact Glow Discharge Electrolysis in Alkaline Electrolytes

Structural Evolution of Pt, Au, and Cu Anodes by Electrolysis up to Contact Glow Discharge Electrolysis in Alkaline Electrolytes

Layered Oxides SrLaFe_1‐xCo_xO_4‐δ (x=0–1) as Bifunctional Electrocatalysts for Water‐Splitting

Nanostructured Molybdenum Oxides from Aluminium-Based Intermetallic Compound: Synthesis and Application in Hydrogen Evolution Reaction

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Nanoporous Gold Surface: An Efficient Platform for Hydrogen Evolution Reaction at Very Low Overpotential

Cited by 27 publications

References 38 publications

Structural Evolution of Pt, Au, and Cu Anodes by Electrolysis up to Contact Glow Discharge Electrolysis in Alkaline Electrolytes

Structural Evolution of Pt, Au, and Cu Anodes by Electrolysis up to Contact Glow Discharge Electrolysis in Alkaline Electrolytes

Layered Oxides SrLaFe1‐xCoxO4‐δ (x=0–1) as Bifunctional Electrocatalysts for Water‐Splitting

Nanostructured Molybdenum Oxides from Aluminium-Based Intermetallic Compound: Synthesis and Application in Hydrogen Evolution Reaction

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Layered Oxides SrLaFe_1‐xCo_xO_4‐δ (x=0–1) as Bifunctional Electrocatalysts for Water‐Splitting