Enhanced Catalytic Activity for Methanol Electro‐oxidation of Uniformly Dispersed Nickel Oxide Nanoparticles—Carbon Nanotube Hybrid Materials

Tong, Xili; Qin, Yong; Guo, Xiang‐Yun; Moutanabbir, Oussama; Ao, Xianyu; Pippel, Eckhard; Zhang, Lianbing; Knez, Mato

doi:10.1002/smll.201200839

Cited by 146 publications

(119 citation statements)

References 52 publications

(28 reference statements)

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“…As was expected, CoOx@CNTs/GCE (curve b) has shown the lowest electrocatalytic activity in comparison to the other oxides, and CuOx@CNTs/GCE (curve c) revealed better activity towards methanol oxidation than CoOx@CNTs/GCE, which was shown by higher current values and a negative shift in the onset potential of the methanol oxidation (I = 1.0 mA and 0.6 mA around 0.6 V for CuOx and CoOx, respectively). As reported in the literature, NiOx is one of the pioneer eletrocatalysts for alcohol oxidation in alkaline medium, and that appeared clearly in our work where NiOx@CNTs/GCE (curve d) showed the best catalytic activity for methanol oxidation among the addressed mono-catalysts, where there is a significant negative shift in the onset potential and increase in the oxidation current [9].…”

Section: Methanol Electrocatalytic Oxidation At the Modified Electrodessupporting

confidence: 77%

High Electrocatalytic Performance of CuCoNi@CNTs Modified Glassy Carbon Electrode towards Methanol Oxidation in Alkaline Medium

et al. 2017

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Abstract:A novel non-precious multiwalled carbon nanotubes (CNTs)-supported metal oxide electrocatalyst was developed for methanol electrooxidation in alkaline medium. The catalyst was fabricated by simultaneous electrodeposition of copper-cobalt-nickel ternary nanostructures (CuCoNi) on a glassy carbon electrode (GCE) modified with CNTs. The proposed electrode was characterized using X-ray diffraction (XRD), energy dispersive X-ray (EDX), and scanning electron microscopy (SEM). The electrochemical behavior and the electrocatalytic performance of the suggested electrode towards the oxidation of methanol were evaluated by cyclic voltammetry (CV), linear sweep voltammetry (LSV), and chronoamperometry (CA) in alkaline medium. Several parameters were investigated, e.g., deposition time, potential scan rate, etc. Compared to Cu, Co, or Ni mono electrocatalysts, the electrode based on ternary-metals exhibited superior electrocatalytic activity and stability towards methanol electrooxidation. For instance, CuCoNi@CNTs/GCE has shown at least 2.5 times electrocatalytic activity and stability compared to the mono eletrocatalysts. Moreover, the present study found that the optimized loading level is 1500 s of simultaneous electrodeposition. At this loading level, it was found that the relation between the I p /ν 1/2 function and scan rate gives the characteristic features of a catalytic process. The enhanced activity and stability of CuCoNi@CNTs/GCE was attributed to (i) a synergism between three metal oxides coexisting in the same structure; (ii) the presence of CNTs as a support for the metal oxides, that offers high surface area for the deposited tertiary alloy and suppresses the aggregation and sintering of the metals oxide with time; as well as (iii) the increase of the conductivity of the deposited semiconducting metal oxides.

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Section: Methanol Electrocatalytic Oxidation At the Modified Electrodessupporting

confidence: 77%

High Electrocatalytic Performance of CuCoNi@CNTs Modified Glassy Carbon Electrode towards Methanol Oxidation in Alkaline Medium

et al. 2017

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“…Because of discrepancies in previous reports of this NiO ALD process, we performed a systematic characterization of the ALD deposition. [ 37,41,42 ] NiO was deposited at a stage temperature of 275 °C and a Ni(Cp) 2 bubbler temperature of 85-90 °C. Under these conditions, measurements of fi lm thickness after 75 cycles for different pulse lengths showed that saturation was achieved after ≈8 s for the Ni(Cp) 2 pulse and ≈3 s for the O 3 pulse as seen in Figure 1 a,b.…”

Section: Resultsmentioning

confidence: 99%

Creating Highly Active Atomic Layer Deposited NiO Electrocatalysts for the Oxygen Evolution Reaction

Nardi

Yang

Dickens

et al. 2015

Advanced Energy Materials

224

171

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Atomic layer deposition (ALD) provides a promising route for depositing uniform thin coatings of electrocatalysts useful in many technologies, including the splitting of water. For materials such as NiO x that readily form hydrous oxides, however, the smooth, compact films deposited by ALD may result in higher overpotentials due to low catalyst surface area compared to other deposition methods. Here, the use of ALD–NiO thin films as oxygen evolution reaction (OER) electrocatalysts is explored. Thin films of crystalline ALD–NiO are deposited and OER activity is tested using cyclic voltammetry (CV). Fe incorporated from the electrolyte can increase the activity of NiO, and it is shown that the turnover frequency (TOF) increases tenfold by going from an Fe‐poor to Fe‐rich KOH electrolyte. Applying a potential exfoliates the NiO, increasing the number of electrochemically accessible Ni sites. Interestingly, by X‐ray photoelectron spectroscopy (XPS) and CV, it is found that an Fe‐rich electrolyte reduces the amount of restructuring and oxidation is found. It is shown that a high surface area, high TOF catalyst may be created by using a two‐step process in which the sample is sequentially conditioned in Fe‐poor then Fe‐rich KOH. This work highlights the importance of pretreatment on catalytic activity for compact NiO films deposited by ALD.

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“…CNTs also serve as a good supporting material for heterostructure like metal and metal oxide catalyst and hence they find application in electrode modification to obtain high-performance sensors [32,33]. Many different methods for decoration of CNTs with metal oxide are reported such as, wet impregnation, ball-milling, sputtering, electro-deposition, etc.…”

Section: Introductionmentioning

confidence: 99%

Multi-wall carbon nanotube–NiO nanoparticle composite as enzyme-free electrochemical glucose sensor

Prasad

Bhat

2015

Sensors and Actuators B: Chemical

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Enhanced Catalytic Activity for Methanol Electro‐oxidation of Uniformly Dispersed Nickel Oxide Nanoparticles—Carbon Nanotube Hybrid Materials

Cited by 146 publications

References 52 publications

High Electrocatalytic Performance of CuCoNi@CNTs Modified Glassy Carbon Electrode towards Methanol Oxidation in Alkaline Medium

High Electrocatalytic Performance of CuCoNi@CNTs Modified Glassy Carbon Electrode towards Methanol Oxidation in Alkaline Medium

Creating Highly Active Atomic Layer Deposited NiO Electrocatalysts for the Oxygen Evolution Reaction

Multi-wall carbon nanotube–NiO nanoparticle composite as enzyme-free electrochemical glucose sensor

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