Ultralow‐Platinum‐Loading High‐Performance Nanoporous Electrocatalysts with Nanoengineered Surface Structures

Wang, Rongyue; Wang, Chao; Cai, Wen‐Bin; Ding, Yi

doi:10.1002/adma.200903548

Cited by 192 publications

(141 citation statements)

References 26 publications

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“…Obviously, the peak current density at O 1 (j O1 ) on Pton-Au is larger, and the peak current density at O 2 (j O2 ) relatively becomes lower than that on pure Pt toward FA oxidation (in Fig. 5a and Table 3), which is in agreement with the results of previous reports [29,30]. Especially, the M-1:10.22 catalyst of Pt-on-Au shows the highest j O1 (15.76 mA cm −2 ), which is~14 times higher than that of Pt/GCE.…”

Section: Resultssupporting

confidence: 82%

“…Additionally, the surface composition of atomic Pt/Au ratio and the preparation method are significantly related to the electrocatalytic activity of bimetallic PtAu catalyst for FA oxidation reaction [13,[34][35][36]. In general, the high electrocatalytic activity of bimetallic PtAu catalyst has been ascribed to the special electronic effect [29,36,37], ensemble effect [11,20,30], and synergistic effect [34,38,39]. Many research findings have revealed that both Pt-onAu and PtAu alloy catalysts exhibited high electrocatalytic activity toward FA oxidation with much less CO ads than that on Pt catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, various bimetallic Pt-Au catalysts with different structures, such as PtAu alloy [21,28], Pt-modified Au (Pt-on-Au) [29,30], and Au@Pt [31,32], show excellent catalytic activity toward FA oxidation. Park et al [33] found that the uniform Pt-on-Au nanoparticles showed higher electrocatalytic activities than the pure Pt electrocatalyst in the area-and mass-specific current densities.…”

Section: Introductionmentioning

confidence: 99%

“…It is attributed to the enhancement effect of Au atoms and the high Pt utilization in the FA electrooxidation reaction. Ding et al [29] fabricated the monolayer Pt-modified nanoporous Au catalyst with ultralow Pt loading, great tolerance to poisoning, and high stability for FA electooxidation. They suggested that the outmost Au layer may not only inhibit Pt oxidation but also hold a themodynamic stabilization effect.…”

Section: Introductionmentioning

confidence: 99%

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Au as an efficient promoter for electrocatalytic oxidation of formic acid and carbon monoxide: a comparison between Pt-on-Au and PtAu alloy catalysts

et al. 2013

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The absence of unpaired d-electrons of gold leads to its lack of reactivity and paucity of catalytic activity. Synergistic activity of bimetallic PtAu has been proved, and its structure greatly influences on the electrocatalytic activity toward formic acid and carbon monoxide oxidation. Here, a comparison between Pt-modified Au (designated as Pt-on-Au) and PtAu alloy catalysts has been studied. The Pt-on-Au catalyst was prepared by electrodeposition of Pt on the pre-prepared Au, while PtAu alloy was obtained by co-electrodeposition. As a whole, both types of PtAu catalysts were found to be more active toward formic acid electrooxidation compared to pure Pt, exhibiting maximum activity on Pt-on-Au catalyst with Pt to Au atomic ratio of 1:10.22. Moreover, the Pt/Au atomic ratio directly relates to the oxidation pathway of formic acid and carbon monoxide oxidation. The results may be ascribed to much less CO ads on the surface than single Pt catalyst due to the effect of Au nanoparticles. CO stripping voltammograms present the obvious variation between Pt-on-Au and PtAu alloy catalysts. Meanwhile, the electrocatalytic activities of bimetallic PtAu are evaluated by electrochemical impedance spectroscopy and Tafel analysis.

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Au as an efficient promoter for electrocatalytic oxidation of formic acid and carbon monoxide: a comparison between Pt-on-Au and PtAu alloy catalysts

et al. 2013

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“…Chem. Phys., 2012,14,[16415][16416][16417][16418][16419][16420][16421][16422][16423] Enhancing the activity and tuning the mechanism of formic acid oxidation at tetrahexahedral Pt nanocrystals by Au decorationw Hai …”

mentioning

confidence: 99%

Enhancing the activity and tuning the mechanism of formic acid oxidation at tetrahexahedral Pt nanocrystals by Au decoration

Liu

Tian

Brandon

et al. 2012

Phys. Chem. Chem. Phys.

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Tetrahexahedral Pt nanocrystals (THH Pt NCs), bound by high index facets, belong to an emerging class of nanomaterials that promise to bridge the gap between model and practical electrocatalysts. The atomically stepped surfaces of THH Pt NCs are extremely active for the electrooxidation of small organic molecules but they also readily accommodate the dissociative chemisorption of such species, resulting in poisoning by strongly adsorbed CO. Formic acid oxidation is an ideal reaction for studying the balance between these competing catalyst characteristics, since it can proceed by either a direct or a CO mediated pathway. Herein, we describe electrochemical and in situ FTIR spectroscopic investigations of formic acid electrooxidation at both clean and Au adatom decorated THH Pt NC surfaces. The Au decoration leads to higher catalytic currents and enhanced CO 2 production in the low potential range. As the CO oxidation behaviour of the catalyst is not improved by the presence of the Au, it is likely that the role of the Au is to promote the direct pathway. Beyond their fundamental importance, these results are significant in the development of stable, poison resistant anodic electrocatalysts for direct formic acid fuel cells.

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Synthesis of Precious Metal Nanoparticles with High Surface Energy and High Electrocatalytic Activity

Huang

Zhou

Tian

et al. 2013

Advances in Electrochemical Sciences and Engineering

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Ultralow‐Platinum‐Loading High‐Performance Nanoporous Electrocatalysts with Nanoengineered Surface Structures

Cited by 192 publications

References 26 publications

Au as an efficient promoter for electrocatalytic oxidation of formic acid and carbon monoxide: a comparison between Pt-on-Au and PtAu alloy catalysts

Au as an efficient promoter for electrocatalytic oxidation of formic acid and carbon monoxide: a comparison between Pt-on-Au and PtAu alloy catalysts

Enhancing the activity and tuning the mechanism of formic acid oxidation at tetrahexahedral Pt nanocrystals by Au decoration

Synthesis of Precious Metal Nanoparticles with High Surface Energy and High Electrocatalytic Activity

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