Methanol oxidation on titanium-supported nano-scale Ni flakes

Yi, Qingfeng; Huang, Wu; Zhang, Jingjing; Liu, Xiaoping; Li, Lei

doi:10.1016/j.catcom.2008.03.051

Cited by 71 publications

(34 citation statements)

References 33 publications

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“…However, the bare Co 3 O 4 ‐modified electrode displays onset potentials of 0.45 and 0.42 V (vs. Hg/HgO) for methanol and ethanol oxidation, respectively (Figure C,D). Interestingly, the observed onset potential for the proposed GO/Co 3 O 4 /racks‐GC catalyst is much lower than those of electrodes fabricated using NiCo 2 O 4 /SS Co 3 O 4 /NiO, NiCo 2 O 4 –RGO, NiCo 2 O 4 nanostructures, and Co 3 O 4 , NiO, titanium/Ni nanoflakes, and NiO@multiwalled carbon nanotubes . The superior electroactivity for ethanol and methanol electrooxidation in terms of lower onset potential and remarkable current density of porous GO/Co 3 O 4 racks compared with GO/Co 3 O 4 blocks indicates the effective role of dense Co 3+ sites along densely exposed {112} or {112}/{111} facets and hierarchically nonstacked sheet racks in ethanol and methanol oxidation.…”

Section: Electrocatalytic Activity Of Sheet Racks and Blocks For Methmentioning

confidence: 94%

Mesoscopic Fabric Sheet Racks and Blocks as Catalysts with Efficiently Exposed Surfaces for Methanol and Ethanol Electrooxidation

Shenashen

Hassen

El‐Safty

et al. 2016

Adv Materials Inter

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Electrode designs based on sheet racks and blocks w ith multi-diffuse groove spaces and enriched active sites and scales would promote the commercial applications of electroactive materials. We report a facile one-pot hydrothermal approach to synthesize mesoscopic porous Co 3 O 4 or hybrid graphene (GO)/Co 3 O 4 sheet-on-sheet racks and blocks. Three basic types of sheet scalability racks can be built in vertical and non-stacked edge orientations, such as neat micro/nano-groove rooms, butterfly wing scales, and wall groves, leading to highly exposed surface converges and sites. In particular, the stacked S-GO/Co 3 O 4 sheet-on-sheet blocks can be oriented in vertical tower buildings. The atomic structures of the developed Co 3 O 4 catalysts were dominant along the highly dense {112/111} interfaces and single crystal {111} and {112} facets. The electrochemical performance of the mesoscopic porous Co 3 O 4 catalyst toward alcohol electrooxidation was evaluated in alkaline conditions. The mesoscopic hybrid GO/Co 3 O 4 racks revealed superior catalytic activity in terms of oxidation currents and onset potentials, indicating the effect of the synergetic role of active Co 3+ sites along the densely exposed {112} facets, graphene counterparts, and hierarchically non-stacked sheet racks on the electroactive functionality. Results indicate that the mesoscopic GO/Co 3 O 4 sheet catalyst is suitable for highly efficient electrochemical reactions.

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Section: Electrocatalytic Activity Of Sheet Racks and Blocks For Methmentioning

confidence: 94%

Mesoscopic Fabric Sheet Racks and Blocks as Catalysts with Efficiently Exposed Surfaces for Methanol and Ethanol Electrooxidation

Shenashen

Hassen

El‐Safty

et al. 2016

Adv Materials Inter

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show abstract

“…Ni [7][8][9][10] and Nibased alloys reported to date, such as NiCu [11][12][13][14], NiFe [15], NiCo [16], NiMn [17] and NiTi [18,19] show excellent catalytic activities, but even in alkaline electrolytes, they lack of a satisfactory durability.…”

Section: Nimentioning

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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“…27,28 Given Se, O, and S elements are in the same family with similar 60 properties, we may suggest that NiSe/Ni electrode shares similar methanol oxidation mechanism with nickel oxide or sulfide. 29,30 Note that the NiSe/Ni electrode also outperforms some previously reported catalysts including NiCo 2 O 4 , 19 NiCo 2 S x , 29 titaniumsupported nano-scale Ni flakes, 31 and NiO/multi-walled carbon 65 nanotubes composites. 32 The high electro-catalytic activity of NiSe/Ni could be attributed to the following four reasons.…”

mentioning

confidence: 66%

In situ growth of nickel selenide nanowire arrays on nickel foil for methanol electro-oxidation in alkaline media

et al. 2015

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Methanol oxidation on titanium-supported nano-scale Ni flakes

Cited by 71 publications

References 33 publications

Mesoscopic Fabric Sheet Racks and Blocks as Catalysts with Efficiently Exposed Surfaces for Methanol and Ethanol Electrooxidation

Mesoscopic Fabric Sheet Racks and Blocks as Catalysts with Efficiently Exposed Surfaces for Methanol and Ethanol Electrooxidation

NiSn bimetallic nanoparticles as stable electrocatalysts for methanol oxidation reaction

In situ growth of nickel selenide nanowire arrays on nickel foil for methanol electro-oxidation in alkaline media

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