Electrocatalytic Performance of Gold Nanoparticles Supported on Activated Carbon for Methanol Oxidation in Alkaline Solution

Yan, Shaohui; Zhang, Shichao; Lin, Ye; Liu, Guanrao

doi:10.1021/jp1086834

Cited by 103 publications

(101 citation statements)

References 49 publications

(73 reference statements)

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“…[ 46 ] Also, Zhang and co-workers reported 48.6 mA/mg in 0.10 M KOH and 5.0 M CH 3 OH with Au NPs supported on a commercial activated carbon (Vulcan XC-72R). [ 47 ] In case of our (Au/GO) 6 fi lm after 150 ° C treatment, we found signifi cantly higher catalytic activity of 273 mA/mg under the identical reaction condition.…”

Section: Full Papermentioning

confidence: 66%

“…[48][49][50] The overall reaction order of methanol oxidation with respect to the concentration of methanol can be estimated from the slope of linear fi t of 0.89 at different potentials ( Figure S8), which suggests that the methanol oxidation mechanism in the Tafel ranges remains constant irrespective of increasing concentration of methanol. [ 47 ] Although more stringent stability tests are necessary in order to meet the requirements for actual fuel cell performance, we observe that the multiple electrocatalytic cycles of (Au/GO) 6 fi lms thermal treated at 150 ° C show a stable electrochemical response over 100 cycles with a retention of 88% ( Figure 4 a and b). In a clear contrast, the free Au NPs without GO support have a signifi cantly lower cyclic stability of 44% with a low current density (0.107 mA/cm 2 vs 0.696 mA/cm 2 of (Au/GO) 6 fi lm), emphasizing the critical role of graphene nanosheet as a chemically stable support in preserving the catalytic active surface of Au NPs during electrochemical cycles (Figure 4 c and d).…”

Section: Full Papermentioning

confidence: 94%

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Graphene Multilayer Supported Gold Nanoparticles for Efficient Electrocatalysts Toward Methanol Oxidation

Choi

Park

et al. 2012

Advanced Energy Materials

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This study reports a simple method of integrating electroactive gold nanoparticles (Au NPs) with graphene oxide (GO) nanosheet support by layer‐by‐layer (LbL) assembly for the creation of 3‐dimensional electrocatalytic thin films that are active toward methanol oxidation. This approach involves the alternating assembly of two oppositely charged suspensions of Au NPs with GO nanosheets based on electrostatic interactions. The GO nanosheets not only serve as structural components of the multilayer thin film, but also potentially improve the utilization and dispersion of Au NPs by taking advantages of the high catalytic surface area and the electronic conduction of graphene nanosheets. Furthermore, it is found that the electrocatalytic activity of the multilayer thin films of Au NPs with graphene nanosheet is highly tunable with respect to the number of bilayers and thermal treatment, benefiting from the advantageous features of LbL assembly. Because of the highly versatile and tunable properties of LbL assembled thin films coupled with electrocatalytic NPs, we anticipate that the general concept presented here will offer new types of electroactive catalysts for direct methanol fuel cells.

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Section: Full Papermentioning

confidence: 66%

Section: Full Papermentioning

confidence: 94%

Graphene Multilayer Supported Gold Nanoparticles for Efficient Electrocatalysts Toward Methanol Oxidation

Choi

Park

et al. 2012

Advanced Energy Materials

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“…S8) ). 27,28 Each catalyst was held at a potential of 1.9 V for 1 hour in N 2 saturated 0.1 M NaOH + 1M MeOH in a sealed two compartment H-type cell and the products were analyzed using gas chromatography (GC).…”

Section: Figurementioning

confidence: 99%

Selective Electrocatalytic Activity of Ligand Stabilized Copper Oxide Nanoparticles

Kauffman

Ohodnicki

Kail

et al. 2011

J. Phys. Chem. Lett.

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ABSTRACT. Ligand stabilization can influence the surface chemistry of Cu oxide nanoparticles (NPs) and provide unique product distributions for electrocatalytic methanol (MeOH) oxidation and CO 2 reduction reactions. Oleic acid (OA) stabilized Cu 2 O and CuO NPs promote the MeOH oxidation reaction with 88% and99.97% selective HCOH formation, respectively. Alternatively, CO 2 is the only reaction product detected for bulk Cu oxides and Cu oxide NPs with no ligands or weakly interacting ligands. We also demonstrate that OA stabilized Cu oxide NPs can reduce CO 2 into CO with a ~1.7-fold increase in CO / H 2 production ratios compared to bulk Cu oxides. The OA stabilized Cu oxide NPs also show 7.6 and 9.1-fold increases in CO / H 2 production ratios compared to weakly stabilized Published J. Phys. Chem. Lett., Vol 2, pgs [2038][2039][2040][2041][2042][2043] 2011 and non-stabilized Cu oxide NPs, respectively. Our data illustrates that the presence and type of surface ligand can substantially influence the catalytic product selectivity of Cu oxide NPs. TOC GraphicKeywords: nanoparticles, copper oxide, electrocatalysis, methanol oxidation, CO 2 reduction Organic ligands are commonly used as stabilizing agents during the synthesis of nanoparticles (NPs), [1][2][3] but little is known about their effect on the NP reactivity. Relative change to a particular catalytic rate is a common metric for describing ligand effects and any changes are typically attributed to surface coverage considerations or control over the NP size. [4][5][6] A few reports have considered that ligands could play a more active role in dynamic control over NP aggregation, 7 charge transfer with the NP surface, 8,9 influence over support interactions, 10 or control over reactant access to the NP surface. 11Along these lines, one could also consider a situation where stabilization of particular reactive sites or surface structures may influence both catalytic activity and product selectivity.Metal oxide NPs are an interesting platform to study ligand influenced electrocatalysis because their surface composition and oxidation state can influence reactivity and product selectivity towards reactions such as methanol (MeOH) oxidation 12 and CO 2 reduction. 13,14 We have used MeOH oxidation as a model reaction to investigate the product selectivity of a variety of bulk and nanoparticulate copper oxides. Oleic acid (OA) stabilized Cu oxide NPs promote the highly selective formation of HCOH, Published J. Phys. Chem. Lett., Vol 2, pgs 2038-2043, 2011 whereas CO 2 was the only reaction product detected for bulk Cu oxides and Cu oxide NPs with no ligands or weakly interacting ligands. While the six-electron oxidation of MeOH into CO 2 is an important reaction for fuel cell applications, 15 our observation of highly selective HCOH formation is an interesting demonstration of ligand influenced surface chemistry. Moreover, selective HCOH formation has practical applications because annual HCOH consumption exceeds 25 million tons. 16In addition to...

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“…To electrocatalysts, conductive substrate modified with noble metal nanoparticles were extensively used in DMFCs for the reason of high activities and low costs [19,20]. Hence, the Au/C catalyst has been received high attention in recent years [21,22]. (3) AuPt composite catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…In the previous research [21,22], Yan et al reported the adoption of a modified chemical reduction method (deposition-reduction process, DRP) in preparation of the Au/C catalyst with high activity for the MEO. Herein, the effect of the preparation conditions (e.g.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Au/C catalyst with high electrooxidation activity

Yan

Gao

Zhang

et al. 2013

Electrochimica Acta

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Electrocatalytic Performance of Gold Nanoparticles Supported on Activated Carbon for Methanol Oxidation in Alkaline Solution

Cited by 103 publications

References 49 publications

Graphene Multilayer Supported Gold Nanoparticles for Efficient Electrocatalysts Toward Methanol Oxidation

Graphene Multilayer Supported Gold Nanoparticles for Efficient Electrocatalysts Toward Methanol Oxidation

Selective Electrocatalytic Activity of Ligand Stabilized Copper Oxide Nanoparticles

Synthesis of Au/C catalyst with high electrooxidation activity

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