Ionic Layer Epitaxy of Nanometer-Thick Palladium Nanosheets with Enhanced Electrocatalytic Properties

Yin, Xin; Chen, Qinyi; Tian, Peng; Pei, Zingway; Zhang, Ziyi; Voyles, Paul M.; Wang, Xudong

doi:10.1021/acs.chemmater.8b00575

Cited by 36 publications

(20 citation statements)

References 36 publications

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“…In addition to the reductants discussed above, simple aldehydes, as well as complex aldehyde‐based compounds such as sugars, also show great versatility as reductants for the synthesis of metal nanocrystals . This class of compounds has received special attention for shape‐controlled synthesis due to their relatively mild reducing capability.…”

Section: Case Studiesmentioning

confidence: 99%

Synthesis of Colloidal Metal Nanocrystals: A Comprehensive Review on the Reductants

Rodrigues

Zhao

Yang

et al. 2018

Chemistry A European J

169

164

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There is a growing interest in controlling the synthesis of colloidal metal nanocrystals and thus tailoring their properties toward various applications. In this context, choosing an appropriate combination of reagents (e.g., salt precursor, reductant, capping agent, and stabilizer) plays a pivotal role in enabling the synthesis of metal nanocrystals with diversified sizes, shapes, and structures. Here we present a comprehensive review that highlights one of the key reagents for the synthesis of metal nanocrystals via chemical reduction: the reductants. We start with a brief introduction to the compounds commonly employed as reductants in the colloidal synthesis of metal nanocrystals by showing their oxidation half-reactions and the corresponding oxidation potentials. Then we offer specific examples pertaining to the controlled synthesis of metal nanocrystals, followed by some fundamental aspects covering the general mechanisms of metal ion reduction based on the Marcus Theory. Afterwards, we present a case-by-case discussion on a wide variety of reductants, including their major properties, reduction mechanisms, and additional effects on the final products. We illustrate these aspects by selecting key examples from the literature and paying close attention to the underlying mechanism in each case. At the end, we conclude by summarizing the highlights of the review and providing some perspectives on future directions.

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Section: Case Studiesmentioning

confidence: 99%

Synthesis of Colloidal Metal Nanocrystals: A Comprehensive Review on the Reductants

Rodrigues

Zhao

Yang

et al. 2018

Chemistry A European J

169

164

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Section: Two‐dimensional Nanostructuresmentioning

confidence: 99%

“…Moreover, the thickness of the sheet is always beyond the nanometer regime. To solve this problem, Wang and co‐workers synthesized Pd NSs with a tunable thickness from 2.0 to 3.2 nm using ionic layer epitaxy (ILE). In a typical ILE procedure (Figure c), a self‐assembled amphiphilic monolayer at the water/air interface is used as a soft template to guide the growth of the NSs underneath.…”

Section: Two‐dimensional Nanostructuresmentioning

confidence: 99%

Recent Achievements in Noble Metal Catalysts with Unique Nanostructures for Liquid Fuel Cells

Sun

2020

ChemSusChem

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In recent years, research efforts have been focused on the design and fabrication of highly efficient catalysts for liquid fuel cells, because the use of these cells is an important approach for alleviating environmental pollution and energy crises. However, the limitations of the catalytic performance of industrial Pt/C have strongly hindered the development of these fuel cells. The catalyst morphology has a strong impact on its performance; nanostructured catalysts are preferred as they offer large specific surface area and more exposed active centers. In view of this, many catalysts with unique structures have been synthesized in recent years, all of which show excellent catalytic performance characteristics. Despite these achievements, few efforts have been made to survey this field comprehensively. Herein, the recent advances in catalysts for liquid fuel cells are summarized, with a focus on noble metal catalysts with unique morphologies such as nanowires, nanosheets, and assembly structures. Their formation mechanisms are discussed critically. The relationship between the unique morphologies and excellent performance of these catalysts is also explored. This work may provide guidelines for the further development of liquid fuel cells.

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“…Precisely controlling the compositions, structures and morphologies of HMNCs can directly impact their functionalities [ 8 , 9 ]. A body of research demonstrates that electrocatalytic reactions, such as formic acid oxidation (FAO), have reflected the structural characteristics of nanomaterials, especially nanostructures based on Pt and Pd [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. Both of the two noble metals are universal components of electrocatalysts toward FAO.…”

Section: Introductionmentioning

confidence: 99%

PdAgPt Corner-Satellite Nanocrystals in Well-Controlled Morphologies and the Structure-Related Electrocatalytic Properties

Qian

Guo

et al. 2021

Nanomaterials

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The functions of heterogeneous metallic nanocrystals (HMNCs) can be undoubtedly tuned by controlling their morphologies and compositions. As a less-studied kind of HMNCs, corner-satellite multi-metallic nanocrystals (CSMNCs) have great research value in structure-related electrocatalytic performance. In this work, PdAgPt corner-satellite nanocrystals with well-controlled morphologies and compositions have been developed by temperature regulation of a seed-mediated growth process. Through the seed-mediated growth, the morphology of PdAgPt products evolves from Pd@Ag cubes to PdAgPt corner-satellite cubes, and eventually to truncated hollow octahedra, as a result of the expansion of {111} facets in AgPt satellites. The growth of AgPt satellites exclusively on the corners of central cubes is realized with the joint help of Ag shell and moderate bromide, and hollow structures form only at higher reaction temperatures on account of galvanic displacement promoted by the Pd core. In view of the different performances of Pd and Pt toward formic acid oxidation (FAO), this structure-sensitive reaction is chosen to measure electrocatalytic properties of PdAgPt HMNCs. It is proven that PdAgPt CSMNCs display greatly improved activity toward FAO in direct oxidation pathway. In addition, with the help of AgPt heterogeneous shells, all PdAgPt HMNCs exhibit better durability than Pd cubes and commercial Pt.

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Ionic Layer Epitaxy of Nanometer-Thick Palladium Nanosheets with Enhanced Electrocatalytic Properties

Cited by 36 publications

References 36 publications

Synthesis of Colloidal Metal Nanocrystals: A Comprehensive Review on the Reductants

Synthesis of Colloidal Metal Nanocrystals: A Comprehensive Review on the Reductants

Recent Achievements in Noble Metal Catalysts with Unique Nanostructures for Liquid Fuel Cells

PdAgPt Corner-Satellite Nanocrystals in Well-Controlled Morphologies and the Structure-Related Electrocatalytic Properties

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