Electrochemical and spectroelectrochemical analyses of hydrothermal carbon supported nickel electrocatalyst for ethanol electro-oxidation in alkaline medium

Cuña, Andrés; Plascencia, C. Reyes; Silva, E.L. da; Marcuzzo, Jossano Saldanha; Khan, Sherdil; Tancredi, Néstor; Baldan, Maurício Ribeiro; Malfatti, Célia de Fraga

doi:10.1016/j.apcatb.2016.08.063

Cited by 62 publications

(28 citation statements)

References 75 publications

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“…8) [40], and widely studied under different conditions [44][45][46][47]. Briefly, in this mechanism, the electrogenerated Ni(III) can oxidize ethanol by an initial dehydrogenation step typically leading to acetaldehyde and/or acetate [48]. The lower cathodic peak current of the Ni(III) reduction in presence of ethanol is also a strong indication of the direct involvement of Ni(III) in the EOR (Ni(III) is reduced during ethanol oxidation and less is available for the electrochemical reduction).…”

Section: Effects Of Incorporated Metals On the Ethanol Oxidationmentioning

confidence: 99%

Effects of Incorporated Iron or Cobalt on the Ethanol Oxidation Activity of Nickel (Oxy)Hydroxides in Alkaline Media

2019

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Nickel (oxy)hydroxides (NiO x H y) are promising cost-effective materials that exhibit a fair catalytic activity for the ethanol oxidation reaction (EOR) and could be used for sustainable energy conversion. Doping the NiO x H y structure with other metals could lead to enhanced catalytic properties but more research needs to be done to understand the role of the doping metal on the EOR. We prepared NiO x H y films doped with Fe or Co with different metallic ratios by electrodeposition and evaluated the EOR. We found a positive and negative effect on the catalytic activity after the incorporation of Co and Fe, respectively. Our results suggest that Ni atoms are the active sites for the EOR since Tafel slopes were similar on the binary and pristine nickel (oxy)hydroxides and that the formal potential of the Ni(II)/Ni(III) redox couple is a good descriptor for the EOR activity. This work also highlights the importance of controlled metal doping on catalysts and may help in the design and development of improved materials for the EOR.

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Section: Effects Of Incorporated Metals On the Ethanol Oxidationmentioning

confidence: 99%

Effects of Incorporated Iron or Cobalt on the Ethanol Oxidation Activity of Nickel (Oxy)Hydroxides in Alkaline Media

2019

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“…Ni‐based electrocatalysts have been extensively used for the oxidation of sodium borohydride, ethanol, and methanol . Guo et al.…”

Section: Introductionmentioning

confidence: 99%

“…Cuna et al. prepared an activated hydrothermal carbon supported nickel electrocatalyst for ethanol oxidation in alkaline medium . According to their results, the maximum oxidation current densities were comparable to those reported for other types of catalysts for ethanol oxidation.…”

Section: Introductionmentioning

confidence: 99%

Surfactant‐Assisted Electrodeposition of Nickel Nanostructures and Their Electrocatalytic Activities Toward Oxidation of Sodium Borohydride, Ethanol, and Methanol

2019

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Different Ni nanostructures were electrodeposited from the Watts bath in the presence of different concentrations of sodium dodecyl sulfate (SDS) using the pulse reverse current technique on the copper substrate. The concentration of SDS was lower than the critical micelle concentration (CMC), equal to CMC and higher than CMC for electrodeposition of Ni‐1, Ni‐2, and Ni‐3 samples respectively. The electrodeposited samples were characterized by X‐ray diffraction (XRD), atomic force microscopy (AFM), and field emission‐scanning electron microscopy (FE‐SEM) techniques. The electrocatalytic activity of samples for oxidation of sodium borohydride, ethanol, and methanol was investigated using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). For borohydride oxidation, one oxidation peak, as well as one semicircle, observed respectively in the cyclic voltammograms and Nyquist diagrams confirmed that only one reaction happened on the surface of samples. It was observed that at high overpotentials, Ni‐1 sample was more reactive for NaBH4 oxidation compared to the Ni‐2 and Ni‐3 samples.

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“…4c), which can be assigned to the interplane spacing of the (111) and (200) planes of nickel. 41,48,49 The diffusing concentric rings in the selected area electron diffraction (SAED) patterns indicate the polycrystalline structure (Fig. 4c inset).…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of nickel–copper hollow spheres as efficient bifunctional electrocatalysts for overall water splitting

Lin

Chen

2020

Mater. Chem. Front.

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Electrochemical and spectroelectrochemical analyses of hydrothermal carbon supported nickel electrocatalyst for ethanol electro-oxidation in alkaline medium

Cited by 62 publications

References 75 publications

Effects of Incorporated Iron or Cobalt on the Ethanol Oxidation Activity of Nickel (Oxy)Hydroxides in Alkaline Media

Effects of Incorporated Iron or Cobalt on the Ethanol Oxidation Activity of Nickel (Oxy)Hydroxides in Alkaline Media

Surfactant‐Assisted Electrodeposition of Nickel Nanostructures and Their Electrocatalytic Activities Toward Oxidation of Sodium Borohydride, Ethanol, and Methanol

Facile synthesis of nickel–copper hollow spheres as efficient bifunctional electrocatalysts for overall water splitting

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