Ternary PtPdCu Electrocatalyst Formed through Surface‐Atomic Redistribution against Leaching

Cui, Chunhua; Liu, Xiaojing; Li, Hui; Gao, Min‐Rui; Liang, Hai‐Wei; Yao, Hong‐Bin; Yu, Shu‐Hong

doi:10.1002/cctc.201200070

Cited by 19 publications

(26 citation statements)

References 44 publications

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“…11 We found the increase of the Pt/Pd atomic ratio in the surface region (B3 nm sampling depth) measured by X-ray photoelectron spectroscopy (XPS) under potential cycling and, thus, the increased coverage of Pt in the topmost layer. 12 This unique characteristic allows us to study the site-dependent electrocatalytic reaction in situ, such as formic acid oxidation, and understand the fundamental mechanism in electrocatalysis.…”

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Direct evidence for active site-dependent formic acid electro-oxidation by topmost-surface atomic redistribution in a ternary PtPdCu electrocatalyst

Cui

Cong

et al. 2012

Chem. Commun.

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“…The synthesis method of PtPdCu was modified using a previously reported method 12 including electrochemical deposition and thermal treatment (ESI,w Fig. S1).…”

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Direct evidence for active site-dependent formic acid electro-oxidation by topmost-surface atomic redistribution in a ternary PtPdCu electrocatalyst

Cui

Cong

et al. 2012

Chem. Commun.

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“…For instance, a mixed PtPd alloy surface could be obtained by surface atomic redistribution of ternary PtPdCu upon potential cycling in an acidic electrolyte, and the distinctive topmost layer played a key role in the enhancement of catalytic activity [35]. Moreover, we found that mixed-PtPdshell ternary PtPdCu nanoparticle nanotubes also showed significant enhancement for ORR by using copper nanowires as templates [18].…”

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confidence: 82%

“…4f). The much better stabilities of the treated alloy catalysts are possibly due to the rearrangement of the near-surface Pt atoms which reduce the surface dangling bonds due to the leaching of Ni and Co [35,56,57].…”

Section: Lettersmentioning

confidence: 99%

“…Recently, our research on Pt-based binary and ternary electrocatalysts revealed that excellent catalytic activity for ORR, fo rmic acid oxidation, and methanol oxidation could be achieved by alloying Pt with other cheaper transition elements such as Pd, Ni, and Cu by taking advantages of the altered electronic structure of Pt and the favorable surface composition of the alloy electrocatalyst [18,21,24,35,36]. For instance, a mixed PtPd alloy surface could be obtained by surface atomic redistribution of ternary PtPdCu upon potential cycling in an acidic electrolyte, and the distinctive topmost layer played a key role in the enhancement of catalytic activity [35]. Moreover, we found that mixed-PtPdshell ternary PtPdCu nanoparticle nanotubes also showed significant enhancement for ORR by using copper nanowires as templates [18].…”

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Carbon-supported PtCo2Ni2 alloy with enhanced activity and stability for oxygen reduction

Gao

et al. 2015

Sci. China Mater.

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The commercialization of proton exchange membrane fuel cells (PEMFCs) is still restricted by the well-known dilemma, that is, the heavy dependence of using expensive plantinum (Pt) catalyst to negotiate the sluggish oxygen reduction reaction (ORR) kinetics in fuel cell cathodes. Here, a carbon-supported PtCo2Ni2 alloy catalyst with low Pt usage was synthesized via a simple method, which exhibited exceptional ORR activity with a more positive half-wave potential (E1/2) ~57 mV, which was more positive than the state-of-the-art Pt/C catalysts. Moreover, the alloy catalyst performs excellent durability after 10,000 harsh cycles compared with that of Pt/C catalyst in acidic solution, which may be developed as a promising alternative for Ptbased catalysts in fuel cell technology.Proton exchange membrane fuel cells (PEMFCs) have drawn intensive attention as promising candidates for nonpolluting and high-efficiency energy conversion in automotive and portable power [1−3]. However, large-scale commercialization of this technology is greatly hindered by the heavy dependence of using rare Pt as electrocatalysts [4−7]. Considerable efforts have been devoted to developing alternative Pt-free electrocatalysts, while Pt is still the most effective oxygen reduction reaction (ORR) catalyst, especially in acidic environment [8−14]. Therefore, to make PEMFCs economically competitive, an effective way is to develop composition and surface tunable Pt-based alloy catalysts with low cost, high activity and durability [15−20].Recently, a number of studies demonstrated that Ptbased multimetallic electrocatalysts (alloyed with Ni, Co, Fe, Cu, etc.) with altered surface electronic structure would exhibit high catalytic activity for the ORR [21−34]. Recently, our research on Pt-based binary and ternary electrocatalysts revealed that excellent catalytic activity for ORR, fo rmic acid oxidation, and methanol oxidation could be achieved by alloying Pt with other cheaper transition elements such as Pd, Ni, and Cu by taking advantages of the altered electronic structure of Pt and the favorable surface composition of the alloy electrocatalyst [18,21,24,35,36]. For instance, a mixed PtPd alloy surface could be obtained by surface atomic redistribution of ternary PtPdCu upon potential cycling in an acidic electrolyte, and the distinctive topmost layer played a key role in the enhancement of catalytic activity [35]. Moreover, we found that mixed-PtPdshell ternary PtPdCu nanoparticle nanotubes also showed significant enhancement for ORR by using copper nanowires as templates [18]. The c ore/shell Pd/PtFe catalysts also show improved ORR activity and durability, which is highly associated with the FePt shell thickness [37]. It is believed that the arrangement of composition of the topmost layer, and rationally introducing foreign metals to modify the electronic structure of Pt are critical factors to enhance the electrochemical performance of Pt-based ORR catalysts [38].On the other hand, carbon support technology has been verified to be an effective...

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Recent Advances on Controlled Synthesis and Engineering of Hollow Alloyed Nanotubes for Electrocatalysis

2019

Advanced Materials

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The past decade has witnessed great progress in the synthesis and electrocatalytic applications of 1D hollow alloy nanotubes with controllable compositions and fine structures. Hollow nanotubes have been explored as promising electrocatalysts in the fuel cell reactions due to their well‐controlled surface structure, size, porosity, and compositions. In addition, owing to the self‐supporting ability of 1D structure, hollow nanotubes are capable of avoiding catalyst aggregation and carbon corrosion during the catalytic process, which are two other issues for the widely investigated carbon‐supported nanoparticle catalysts. It is currently a great challenge to achieve high activity and stability at a relatively low cost to realize commercialization of these catalysts. An overview of the structural and compositional properties of 1D hollow alloy nanotubes, which provide a large number of accessible active sites, void spaces for electrolytes/reactants impregnation, and structural stability for suppressing aggregation, is presented. The latest advances on several strategies such as hard template and self‐templating methods for controllable synthesis of hollow alloyed nanotubes with controllable structures and compositions are then summarized. Benefiting from the advantages of the unique properties and facile synthesis approaches, the capability of 1D hollow nanotubes is then highlighted by discussing examples of their applications in fuel‐cell‐related electrocatalysis. Finally, the remaining challenges and potential solutions in the field are summarized to provide some useful clues for the future development of 1D hollow alloy nanotube materials.

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Ternary PtPdCu Electrocatalyst Formed through Surface‐Atomic Redistribution against Leaching

Cited by 19 publications

References 44 publications

Direct evidence for active site-dependent formic acid electro-oxidation by topmost-surface atomic redistribution in a ternary PtPdCu electrocatalyst

Direct evidence for active site-dependent formic acid electro-oxidation by topmost-surface atomic redistribution in a ternary PtPdCu electrocatalyst

Carbon-supported PtCo2Ni2 alloy with enhanced activity and stability for oxygen reduction

Recent Advances on Controlled Synthesis and Engineering of Hollow Alloyed Nanotubes for Electrocatalysis

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