Three Dimensional PtRh Alloy Porous Nanostructures: Tuning the Atomic Composition and Controlling the Morphology for the Application of Direct Methanol Fuel Cells

Zhang, Yuan; Janyasupab, Metini; Liu, Chen Wei; Li, Xinxin; Xu, Jiaqiang; Liu, Chung Chiun

doi:10.1002/adfm.201200678

Cited by 111 publications

(80 citation statements)

References 39 publications

(39 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 12 Figure 12(C). Similarly, this alloy-induced MOR catalysis enhancement is also found in other Pt NPs alloyed with transition metals such as Ru [56], Rh [57], and some non-noble transition metals such as Mn [58], Zn [59], and Cu [60]. This correlation shown in Figure 12(D) reveals a "maximum activity plateau" for NPs with 40-60% of atomic Pt.…”

Section: Pt-based Np Catalysts For Mor and Faorsupporting

confidence: 63%

Tailoring Nanoparticle Electrocatalysts for Proton Exchange Membrane Fuel Cells

Zhu

Huang

Zhang

et al. 2015

Catalysis by Materials With Well-Defined Structures

View full text Add to dashboard Cite

Section: Pt-based Np Catalysts For Mor and Faorsupporting

confidence: 63%

Tailoring Nanoparticle Electrocatalysts for Proton Exchange Membrane Fuel Cells

Zhu

Huang

Zhang

et al. 2015

Catalysis by Materials With Well-Defined Structures

View full text Add to dashboard Cite

“…[5][6][7][8][9] Controlling the size, shape, and composition of Rh overgrowth in a core-shell structure could allow for similar advancements in the metal's application towards enhanced heterogeneous catalysis, electrocatalysis, hydrogen storage, and plasmonenhanced catalysis. [5][6][7][8][9] Controlling the size, shape, and composition of Rh overgrowth in a core-shell structure could allow for similar advancements in the metal's application towards enhanced heterogeneous catalysis, electrocatalysis, hydrogen storage, and plasmonenhanced catalysis.…”

Section: Introductionmentioning

confidence: 99%

Iodide-Mediated Control of Rhodium Epitaxial Growth on Well-Defined Noble Metal Nanocrystals: Synthesis, Characterization, and Structure-Dependent Catalytic Properties

et al. 2012

View full text Add to dashboard Cite

Metal nanocrystals (NCs) comprising rhodium are heterogeneous catalysts for CO oxidation, NO reduction, hydrogenations, electro-oxidations, and hydroformylation reactions. It has been demonstrated that control of structure at the nanoscale can enhance the performance of a heterogeneous metal catalyst, such as Rh, but molecular-level control of NCs comprising this metal is less studied compared to gold, silver, platinum, and palladium. We report an iodide-mediated epitaxial overgrowth of Rh by using the surfaces of well-defined foreign metal crystals as substrates to direct the Rh surface structures. The epigrowth can be accomplished on different sizes, morphologies, and identities of metal substrates. The surface structures of the resulting bimetallic NCs were studied using electron microscopy, and their distinct catalytic behaviors were examined in CO stripping and the electro-oxidation of formic acid. Iodide was found to play a crucial role in the overgrowth mechanism. With the addition of iodide, the Rh epigrowth can even be achieved on gold substrates despite the rather large lattice mismatch of ~7%. Hollow Rh nanostructures have also been generated by selective etching of the core substrates. The new role of iodide in the overgrowth and the high level of control for Rh could hold the key to future nanoscale control of this important metal's architecture for use in heterogeneous catalysis.

show abstract

“…In addition to the precious metals discussed here, other precious metals, such as Rh, Ag, Os, and Ir, have also been used as the cores to synthesize core-shell catalysts to catalyze electrochemical reactions in fuel cells [101,179,295,[445][446][447][448][449] and their promotion mechanisms toward Pt catalysts are similar to those of Pd, Ru, and Au.…”

Section: Au As Corementioning

confidence: 99%

Core–Shell-Structured Low-Platinum Electrocatalysts for Fuel Cell Applications

Wang

Luo

et al. 2018

Electrochem. Energ. Rev.

View full text Add to dashboard Cite

Pt-based catalysts are the most efficient catalysts for low-temperature fuel cells. However, commercialization is impeded by prohibitively high costs and scarcity. One of the most effective strategies to reduce Pt loading is to deposit a monolayer or a few layers of Pt over other metal cores to form core-shell-structured electrocatalysts. In core-shell-structured electrocatalysts, the compositions of the core can be divided into five classes: single-precious metallic cores represented by Pd, Ru, and Au; singlenon-precious metallic cores represented by Cu, Ni, Co, and Fe; alloy cores containing 3d, 4d or 5d metals; and carbide and nitride cores. Of these, researchers have found that carbide and nitride cores can yield tremendous advantages over alloy cores in terms of cost and promotional activities of Pt shells. In addition, desirable shells with reasonable thicknesses and compositions have been recognized to play a dominant role in electrocatalytic performances. And recently, researchers have also found that the catalytic activity of core-shell-structured catalysts is dependent on the binding energy of the adsorbents, which is determined by the d-band center of Pt. The shifting of this d-band center in turn is mainly affected by strain and electronic effects, which can be adjusted by adjusting core compositions and shell thicknesses of catalysts. In the development of these core-shell structures, optimal synthesis methods are of primary concern because they directly determine the practical application potential of the resulting electrocatalysts. And in this article, the principles behind core-shell-structured low-Pt electrocatalysts and the developmental progresses of various synthesis methods along with the traits of each type of core and its effects on Pt shell catalytic activities are discussed. In addition, perspectives on this type of catalyst are discussed and future research directions are proposed.

show abstract

Three Dimensional PtRh Alloy Porous Nanostructures: Tuning the Atomic Composition and Controlling the Morphology for the Application of Direct Methanol Fuel Cells

Cited by 111 publications

References 39 publications

Tailoring Nanoparticle Electrocatalysts for Proton Exchange Membrane Fuel Cells

Tailoring Nanoparticle Electrocatalysts for Proton Exchange Membrane Fuel Cells

Iodide-Mediated Control of Rhodium Epitaxial Growth on Well-Defined Noble Metal Nanocrystals: Synthesis, Characterization, and Structure-Dependent Catalytic Properties

Core–Shell-Structured Low-Platinum Electrocatalysts for Fuel Cell Applications

Contact Info

Product

Resources

About