Well-Defined Materials for Heterogeneous Catalysis: From Nanoparticles to Isolated Single-Atom Sites

Chemical Reviews, Год журнала: 2019, Номер 120(2), С. 623 - 682

Опубликована: Дек. 23, 2019

The use of well-defined materials in heterogeneous catalysis will open up numerous new opportunities for the development advanced catalysts to address global challenges energy and environment. This review surveys roles nanoparticles isolated single atom sites catalytic reactions. In second section, effects size, shape, metal-support interactions are discussed nanostructured catalysts. Case studies summarized illustrate dynamics structure evolution under certain reaction conditions. third we syntheses applications atomic anchored on different types supports. final part, conclude by highlighting catalyst gaining a fundamental understanding their active sites.

Язык: Английский

---

Noble-Metal Nanocrystals with Controlled Shapes for Catalytic and Electrocatalytic Applications

Chemical Reviews, Год журнала: 2020, Номер 121(2), С. 649 - 735

Опубликована: Июль 15, 2020

The successful synthesis of noble-metal nanocrystals with controlled shapes offers many opportunities to not only maneuver their physicochemical properties but also optimize figures merit in a wide variety applications. In particular, heterogeneous catalysis and surface science have benefited enormously from the availability this new class nanomaterials as atomic structure presented on nanocrystal is ultimately determined by its geometric shape. immediate advantages may include significant enhancement catalytic activity and/or selectivity substantial reduction materials cost while providing well-defined model system for mechanistic study. With focus monometallic system, review article provides comprehensive account recent progress development shapes, addition remarkable performance large number electrocatalytic reactions. We hope that impetus roadmap next-generation catalysts vital broad range industrial

Язык: Английский

---

A general synthesis approach for amorphous noble metal nanosheets

Nature Communications, Год журнала: 2019, Номер 10(1)

Опубликована: Окт. 24, 2019

Noble metal nanomaterials have been widely used as catalysts. Common techniques for the synthesis of noble often result in crystalline nanostructures. The amorphous nanostructures remains a substantial challenge. We present general route preparing dozens different nanosheets with thickness less than 10 nm by directly annealing mixture acetylacetonate and alkali salts. Tuning atom arrangement metals enables to optimize their catalytic properties. Amorphous Ir exhibit superior performance oxygen evolution reaction under acidic media, achieving 2.5-fold, 17.6-fold improvement mass activity (at 1.53 V vs. reversible hydrogen electrode) over commercial IrO2 catalyst, respectively. In situ X-ray absorption fine structure spectra indicate valance state increased + 4 during process recover its initial after reaction.

Язык: Английский

---

Synthesis of high-entropy alloy nanoparticles on supports by the fast moving bed pyrolysis

Nature Communications, Год журнала: 2020, Номер 11(1)

Опубликована: Апрель 24, 2020

Abstract High-entropy alloy nanoparticles (HEA-NPs) are important class of materials with significant technological potential. However, the strategies for synthesizing uniformly dispersed HEA-NPs on granular supports such as carbon materials, γ-Al 2 O 3 , and zeolite, which is vital to their practical applications, largely unexplored. Herein, we present a fast moving bed pyrolysis strategy immobilize narrow size distribution nm up denary (MnCoNiCuRhPdSnIrPtAu) at 923 K. Fast ensures mixed metal precursors rapidly simultaneously pyrolyzed high temperatures, resulting in nuclei small size. The representative quinary (FeCoPdIrPt) exhibit stability (150 h) toward hydrogen evolution reaction mass activity, 26 times higher than commercial Pt/C an overpotential 100 mV. Our provides improved methodology various supports.

Язык: Английский

---

Bimetallic Sites for Catalysis: From Binuclear Metal Sites to Bimetallic Nanoclusters and Nanoparticles

Chemical Reviews, Год журнала: 2023, Номер 123(8), С. 4855 - 4933

Опубликована: Март 27, 2023

Heterogeneous bimetallic catalysts have broad applications in industrial processes, but achieving a fundamental understanding on the nature of active sites at atomic and molecular level is very challenging due to structural complexity catalysts. Comparing features catalytic performances different entities will favor formation unified structure-reactivity relationships heterogeneous thereby facilitate upgrading current In this review, we discuss geometric electronic structures three representative types (bimetallic binuclear sites, nanoclusters, nanoparticles) then summarize synthesis methodologies characterization techniques for entities, with emphasis recent progress made past decade. The supported nanoparticles series important reactions are discussed. Finally, future research directions catalysis based and, more generally, prospective developments both practical applications.

Язык: Английский

---

Atomically dispersed materials: Ideal catalysts in atomic era

Nano Research, Год журнала: 2023, Номер 17(1), С. 18 - 38

Опубликована: Май 25, 2023

Язык: Английский

---

Microplasmas for Advanced Materials and Devices

Advanced Materials, Год журнала: 2019, Номер 32(18)

Опубликована: Дек. 18, 2019

Microplasmas are low-temperature plasmas that feature microscale dimensions and a unique high-energy-density nonequilibrium reactive environment, which makes them promising for the fabrication of advanced nanomaterials devices diverse applications. Here, recent microplasma applications examined, spanning from high-throughput, printing-technology-compatible synthesis nanocrystalline particles common materials types, to water purification optoelectronic devices. combined with gaseous and/or liquid media at low temperatures atmospheric pressure open new ways form functional Specific examples include gas-phase, substrate-free, plasma-liquid, surface-supported metallic, semiconducting, metal oxide, carbon-based nanomaterials. Representative microplasmas particular importance science technology light sources multipurpose, efficient VUV/UV photochemical processing spectroscopic analysis, surface disinfection, purification, active electromagnetic based on artificial optical materials, other systems including plasma transistor. The current limitations future opportunities in related fields highlighted.

Язык: Английский

---

Toward a Paradigm Shift in Electrocatalysis Using Complex Solid Solution Nanoparticles

ACS Energy Letters, Год журнала: 2019, Номер 4(5), С. 1206 - 1214

Опубликована: Апрель 17, 2019

Complex solid solution (CSS) nanoparticles were recently discovered as efficient electrocatalysts for a variety of reactions. As one many advantages, they exhibit the potential to replace noble-metal catalysts with multinary combinations transition metals because offer formation new unique and tailorable active sites multiple elements located next each other. This Perspective reports on current state challenges (combinatorial) synthesis advanced electron microscopy characterization techniques revealing structure–activity correlations an atomic scale. We discuss what distinguishes this material class from common highlight their act rationalize nontypical electrochemical behavior. provide overview about in synthesis, characterization, evaluation propose guidelines future design CSS achieve further progress research field, which is still its infancy.

Язык: Английский

---

General Solvothermal Synthesis Method for Complete Solubility Range Bimetallic and High‐Entropy Alloy Nanocatalysts

Advanced Functional Materials, Год журнала: 2019, Номер 29(50)

Опубликована: Окт. 9, 2019

Abstract Nanoalloys (NAs) have extraordinary catalytic properties, but metals are often immiscible giving compositional limits on design. It is generally believed that solution‐based chemical synthesis inadequate for obtaining NAs, and exotic shock or severe decomposition reduction reactions required. However, such methods only work the laboratory scale making real‐world applications difficult. Here, a general solvothermal method reported to obtain phase‐pure bimetallic high‐entropy nano‐alloys across entire composition range. Tuning of solvent chemistry precursors leads six different NAs: Pd x Ru 1‐x , Pt Ir Rh without immiscibility regions. All samples face‐centered‐cubic crystal structures, which not previously been observed ruthenium‐based systems. Additionally, quaternary quinary systems produced, demonstrating ability medium‐ NAs. The described herein provides simple, production unknown solid solutions throughout their range potentially allowing detailed tuning nanocatalyst properties.

Язык: Английский

---

High-throughput, combinatorial synthesis of multimetallic nanoclusters

Proceedings of the National Academy of Sciences, Год журнала: 2020, Номер 117(12), С. 6316 - 6322

Опубликована: Март 10, 2020

Multimetallic nanoclusters (MMNCs) offer unique and tailorable surface chemistries that hold great potential for numerous catalytic applications. The efficient exploration of this vast chemical space necessitates an accelerated discovery pipeline supersedes traditional "trial-and-error" experimentation while guaranteeing uniform microstructures despite compositional complexity. Herein, we report the high-throughput synthesis extensive series ultrafine homogeneous alloy MMNCs, achieved by 1) a flexible design formulation in precursor solution phase 2) ultrafast MMNCs using thermal shock heating (i.e., ∼1,650 K, ∼500 ms). This approach is remarkably facile easily accessible compared to conventional vapor-phase deposition, particle size structural uniformity enable comparative studies across compositionally different MMNCs. Rapid electrochemical screening demonstrated scanning droplet cell, enabling us discover two promising electrocatalysts, which subsequently validated rotating disk setup. material presents paradigm broad range

Язык: Английский

---