Mechanistic study of nickel based catalysts for oxygen evolution and methanol oxidation in alkaline medium

Chen, Dayi; Minteer, Shelley D.

doi:10.1016/j.jpowsour.2015.02.143

Cited by 64 publications

(68 citation statements)

References 32 publications

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“…The surface coverage of Ni(OH)2/NiOOH redox pairs participating in the reaction at each Ni-Sn electrode was calculated using the following equation [34,35]:…”

Section: Resultsmentioning

confidence: 99%

NiSn bimetallic nanoparticles as stable electrocatalysts for methanol oxidation reaction

Luo

Zuo

et al. 2018

Applied Catalysis B: Environmental

155

103

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Graphical abstract Scheme 1. NiSn nanoparticles towards methanol oxidation reactions Highlights A new colloidal synthesis route for 3-5 nm NiSn bimetallic nanoparticles with tuned Ni/Sn ratio was developed. The first study of the performance of NiSn as electrocatalysis of methanol oxidation reaction (MOR) is presented. NiSn electrodes showed excellent performance towards MOR, with the most Ni-rich alloy exhibiting mass current densities of 820 mA mg -1 at 0.70 V vs. Hg/HgO, comparable to state of the art Ni electrocatalysts. Stability of NiSn electrodes was clearly superior to that of Ni-based electrodes. NiNi 2+ CH 3 OH Ni 3+Products e e e e e e e e e e e e e e e e e e e e e e e e e e AbstractNickel is an excellent alternative catalyst to high cost Pt and Pt-group metals as anode material in direct methanol fuel cells. However, nickel presents a relatively low stability under operation conditions, even in alkaline media. In this work, a synthetic route to produce bimetallic NiSn nanoparticles (NPs) with tuned composition is presented. Through co-reduction of the two metals in the presence of appropriate surfactants, 3-5 nm NiSn NPs with tuned Ni/Sn ratios were produced. Such NPs were subsequently supported on carbon black and tested for methanol electro-oxidation in alkaline media. Among the different stoichiometries tested, the most Ni-rich alloy exhibited the highest electrocatalytic activity, with mass current density of 820 mA mg -1 at 0.70 V (vs. Hg/HgO). While this activity was comparable to that of pure nickel NPs, NiSn alloys showed highly improved stabilities over periods of 10000 s at 0.70 V. We hypothesize this experimental fact to be associated to the collaborative oxidation of the byproducts of methanol which poison the Ni surface or to the prevention of the tight adsorption of these species on the Ni surface by modifying its surface chemistry or electronic density of states.

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“…The surface coverage of Ni(OH)2/NiOOH redox pairs participating in the reaction at each Ni-Sn electrode was calculated using the following equation [34,35]:…”

Section: Resultsmentioning

confidence: 99%

NiSn bimetallic nanoparticles as stable electrocatalysts for methanol oxidation reaction

Luo

Zuo

et al. 2018

Applied Catalysis B: Environmental

155

103

View full text Add to dashboard Cite

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“…Thus, it appearst hat NiCu oxyhydroxides (Ni 1Àx Cu x OOH) act as the activate electrocatalyst, as reported by Xu et al [24] For comparison, the CVs of Ni/CNTsa nd Cu/CNTs catalysts for ammonia oxidation were also recorded (Figure 5b,c). [25] The production of the electrocatalytic active species NiCuOOH and its surface coverage (G,i n mol cm À2 )c an be calculated by Equation (1): [32] After 0.5 m NH 3 was added to the KOH solution,s ole Ni metal was found to show some activity.W hen the sole Cu catalyst was used (Figure 5c), the anodic current starts at 0.5 Vv s. Hg/HgO, demonstratingt hat Cu/CNTsh ad negligible catalytic activity for ammonia oxidation reaction.…”

Section: Physical Characterization Of Nicu/cntsmentioning

confidence: 99%

“…E 1/2 and DE p represent the half-wave redox potential of NiCu II and NiCu III and the rate of the electron transfer kinetics, [32] respectively.I ti se asier to produce Ni 1Àx Cu x OOH at a lower E 1/2 , [35] and the electron transfer rate is accelerated between the electrode surface and the redox centers at as maller DE p . E 1/2 and DE p represent the half-wave redox potential of NiCu II and NiCu III and the rate of the electron transfer kinetics, [32] respectively.I ti se asier to produce Ni 1Àx Cu x OOH at a lower E 1/2 , [35] and the electron transfer rate is accelerated between the electrode surface and the redox centers at as maller DE p .…”

Section: Electrochemical Characterization Of Nicu/cnts Toward Ammoniamentioning

confidence: 99%

“…[32] The solution OH À concentration affects E 1/2 of the NiCu II /NiCu III redox couple and the rate of electron transfer. [32] Thus, in the following MFC testing, OH À concentrations of 1-3 m werea pplied. Ammonia initially adsorbs during the formation of NiCu oxyhydroxides, whereas OH À is preferentially adsorbed ath igher anodic potential.…”

Section: Electrochemical Characterization Of Nicu/cnts Toward Ammoniamentioning

confidence: 99%

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A Direct Ammonia Microfluidic Fuel Cell using NiCu Nanoparticles Supported on Carbon Nanotubes as an Electrocatalyst

et al. 2018

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This work demonstrates the use of a NiCu electrocatalyst prepared by hydrothermal method with different Ni/Cu mass ratios (70:30, 50:50 and 30:70) supported on carbon nanotubes (CNTs), which was studied with regards to its electrochemical behavior in the ammonia oxidation reaction and direct ammonia microfluidic fuel cell (DAMFC) performance. XRD and SEM-EDX showed the formation of NiCu alloy while TEM showed the particles size to be 15-20 nm. Cyclic voltammetry and chronoamperometry showed that NiCu had higher catalytic activity than pure Ni and pure Cu, and that the active species was a NiCu oxyhydroxide. In DAMFC tests, 50 wt % Ni Cu /CNTs was found to be the most suitable one since it showed a 43 % higher peak power density and 65 % higher maximum current density than Ni electrode. The improved performance was attributed to the NiCu oxyhydroxides formation, which improved the anodic catalytic activity by increasing amounts of active sites and the combined electronic effect of the Ni-Cu bimetallic catalysts.

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“…In the absence of glycerol, the redox signal of Ni(OH) 2 /NiOOH shift was observed. The sharp increase in anodic current initiating at about 0.6 V was attributed to oxygen evolution for GCE-Ni/Gly I in alkali solutions [30,31]. GCE-Ni/Gly I exhibited a higher anodic oxidation current in the presence than in the absence of glycerol.…”

Section: Resultsmentioning

confidence: 95%

Onsite Deposition of Self-Repairing Biomimetic Nanostructured Ni Catalysts with Improved Electrocatalysis toward Glycerol Oxidation for H 2 Production

Xiao

Miao

et al. 2015

Electrochimica Acta

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Mechanistic study of nickel based catalysts for oxygen evolution and methanol oxidation in alkaline medium

Cited by 64 publications

References 32 publications

NiSn bimetallic nanoparticles as stable electrocatalysts for methanol oxidation reaction

NiSn bimetallic nanoparticles as stable electrocatalysts for methanol oxidation reaction

A Direct Ammonia Microfluidic Fuel Cell using NiCu Nanoparticles Supported on Carbon Nanotubes as an Electrocatalyst

Onsite Deposition of Self-Repairing Biomimetic Nanostructured Ni Catalysts with Improved Electrocatalysis toward Glycerol Oxidation for H 2 Production

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