Platinum–Copper Nanoframes: One‐Pot Synthesis and Enhanced Electrocatalytic Activity

Yu, Xiaofei; Li, Lanlan; Su, Yanqiu; Jia, Wei; Dong, Lili; Wang, Dingsheng; Zhao, Jianling; Li, Yadong

doi:10.1002/chem.201600079

Cited by 25 publications

(14 citation statements)

References 51 publications

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“…Oxidative etching is one of the most popular etching strategies, especially the synthesis of PtCu-based NFs occupies an absolute predominance 65 . The statistics above further validate the vital role of oxidative etching in the formation of NFs, particularly for the PtCu-based NFs is benefited from the oxidative etching due to the simple operation and excellent structure 35,66 . A series of progressive reports on PtCu-based NFs such as octopod cubic PtCu, concave cubic PtCu, rhombic dodecahedral PtCuNi and rhombic dodecahedral PtCuRh NFs, emphasized the critical role of oxidative etching in the one-step synthesis of PtCu-based NFs 38,40,41 .…”

Section: Oxidative Etchingsupporting

confidence: 54%

Synthesis and Application of Platinum-based Hollow Nanoframes for Direct Alcohol Fuel Cells

Huang¹,

Zaman²,

Wang³

et al. 2020

Acta Physico Chimica Sinica

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Although platinum (Pt)-based catalysts are suffering from high costs and limited reserves, they are still irreplaceable in a short period of time in terms of catalytic performance. Structural optimization, composition regulation and carrier modification are the common strategies to improve the activity and stability of Pt-based catalyst. Strikingly, the morphological evolution of Pt-based electrocatalyst into nanoframes (NFs) have attracted wide attention to reduce the Pt consumption and improve the electrocatalytic activity simultaneously. Contrary to Pt-based solid nanocrystalline materials, Pt-based NFs have many advantages in higher atomic utilization, open space structure and larger specific surface area, which facilitate electron transfer, mass transport and weaken surface adsorption by more unsaturated coordination sites. Here we introduce the detailed preparation strategies of Pt-based NFs with different etching methods (oxidative etching, chemical etching, galvanic replacement and carbon monoxide etching), crystal structure evolution and formation mechanism, efficient applications for oxygen reduction reaction (ORR), methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR) in direct alcohol fuel cells (DAFCs). Based on the high-efficiency atom utilization, open space structure and diverse alloy composition, Pt-based NFs exhibit superior activity, stability and anti-poisoning than commercial counterparts in the application of DAFCs. The current challenges and future development of Pt-based NFs are prospected on the type of NFs materials, synthesis and etching methods, crystal control and catalytic performance. We propose a series of improvement mechanisms of Pt-based NFs, such as small size effect, high-energy facets, Pt-skin construction and Pt-C integration, thereby weakening the molecule absorption, increasing the Pt utilization, strengthening the intrinsic stability, and alleviating the metal dissolution and support corrosion. Additionally, the scale-up synthesis of catalytic materials, membrane electrodes assembly, and development of the start-stop system and the circulation system design are essential for the commercial application of Pt-based NFs and industrial manufacturing of DAFCs. More importantly, the reaction mechanism, active site distribution and dynamic changes in the catalytic material during the catalytic reaction are crucial to further explain the maintenance and evolution of catalytic performance, which will open a window to elucidate the improvement mechanism of the catalyst in the fuel cell reactions. This review work would promote continuous upgradations and understandings on Pt-based NFs in the future development of DAFCs.

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Section: Oxidative Etchingsupporting

confidence: 54%

Synthesis and Application of Platinum-based Hollow Nanoframes for Direct Alcohol Fuel Cells

Huang¹,

Zaman²,

Wang³

et al. 2020

Acta Physico Chimica Sinica

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“…To maximize the utilization of Pt for a variety of reactions, much effort has been focused on constructing favored nanostructures, including hollow or open nanostructures. − More recent studies suggested that bimetallic PtNi − and PtCu − nanocrystals with hollow and open structures have attracted great interest as electrocatalysts due to their large surface area-to-volume ratio and three-dimensional accessible surface. However, with concern for the acidic environment, most of the synthesized frame-like nanocrystals in recent reports are Pt-enriched entirely, and thus the utilization of Pt is still important due to the uselessness of Pt atoms in inner atomic layers of the edges.…”

Section: Introductionmentioning

confidence: 99%

Low Pt-Content Ternary PtNiCu Nanoparticles with Hollow Interiors and Accessible Surfaces as Enhanced Multifunctional Electrocatalysts

Zhang

Lin

et al. 2020

ACS Appl. Mater. Interfaces

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Developing highly active and durable electrocatalysts with low levels of Pt content toward some crucial reactions including oxygen reduction reaction, hydrogen evolution reaction, and methanol oxidation reaction in an acidic electrolyte environment are desirable but still an open challenge for clean and efficient energy conversion. Herein, we present a facile route to synthesize low Pt-content ternary PtNiCu nanostructures with hollow interior and accessible surfaces (H-PtNiCu-AAT NPs) as enhanced multifunctional electrocatalysts. The galvanic replacement reaction and atomic diffusion between in situ preformed CuNi nanocrystals and Pt species should be responsible for the formation of hollow PtNiCu NPs. Continuous activation by acid picking and annealing treatments were performed to leach out the excessive Cu and Ni on the surfaces and to enrich Pt-content on the surface. H-PtNiCu-AAT NPs exhibit excellent activity and durability toward HER, ORR, and MOR due to the rational integration of multiple structural advantages. Strikingly, the mass activity and specific activity of H-PtNiCu-AAT NPs (0.977 A mgPt –1 and 1.458 mA cm–2) is 7.1 and 6.9 times higher than that of commercial Pt/C (0.138 A mgPt –1 and 0.212 mA cm–2) toward ORR at 0.9 V (vs RHE), respectively. This present work provides an efficient strategy for the design of low Pt-content trimetallic electrocatalysts with excellent activity and durability.

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“…On the basis of the aforementioned analysis, Figure exhibits the formation mechanism of PtCu DNFs. As reported previously, the presence of CTAC would weaken the interactions between Pt(acac) 2 and OAm . On the basis of this assumption, Cu 2+ ions are preferentially reduced to metallic Cu atoms by allantoin and OAm served as the coreductants, followed by the quick coverage of the adjacent CTAC and allantoin molecules.…”

Section: Results and Discussionmentioning

confidence: 99%

Solvothermal Synthesis of Monodisperse PtCu Dodecahedral Nanoframes with Enhanced Catalytic Activity and Durability for Hydrogen Evolution Reaction

Zhang

Wang

Zhang

et al. 2018

ACS Appl. Energy Mater.

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Nanoframes (NFs) with highly open structures have attracted substantial attention because of their large surface area, three-dimensional structure and good stability, which are of significance to enhance the catalytic characters. However, it is still challenging to develop facile and efficient method to construct Pt-based NFs with tailored structures. Herein, a simple solvothermal method was developed to prepare monodisperse PtCu dodecahedral nanoframes (PtCu DNFs), where cetyltrimethylammonium chloride (CTAC) served as the structure-director and dispersing agent, oleylamine as reductant, allantoin as the co-structure-director and coreductant. The PtCu DNFs displayed remarkably improved catalytic performances for hydrogen evolution reaction (HER) in both acid and alkaline electrolytes relative to homemade PtCu nanopolyhedrons (NPHs), commercial Pt/C (20 wt%) and Pt black catalysts. The work offers some instructive guidelines for synthesis of novel metallic NFs as efficient HER catalysts.

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Platinum–Copper Nanoframes: One‐Pot Synthesis and Enhanced Electrocatalytic Activity

Cited by 25 publications

References 51 publications

Synthesis and Application of Platinum-based Hollow Nanoframes for Direct Alcohol Fuel Cells

Synthesis and Application of Platinum-based Hollow Nanoframes for Direct Alcohol Fuel Cells

Low Pt-Content Ternary PtNiCu Nanoparticles with Hollow Interiors and Accessible Surfaces as Enhanced Multifunctional Electrocatalysts

Solvothermal Synthesis of Monodisperse PtCu Dodecahedral Nanoframes with Enhanced Catalytic Activity and Durability for Hydrogen Evolution Reaction

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