Abstract Fabrication of 3 d metal‐based core@shell nanocatalysts with engineered Pt‐surfaces provides an effective approach for improving the catalytic performance. The challenges in such preparation include shape control metallic cores and thickness Pt‐based shells. Herein, we report a colloidal seed‐mediated method to prepare octahedral CuNi@Pt‐Cu nanocrystals using CuNi as template. By precisely controlling synthesis conditions including deposition rate diffusion shell‐formation through...

Tuning the crystal phase of bimetallic nanocrystals offers an alternative avenue to improving their electrocatalytic performance. Herein, we present a facile and one-pot synthesis approach that is used enhance catalytic activity stability toward oxygen reduction reaction (ORR) in alkaline media via control structure Pd–Bi nanocrystals. By merely altering types Pd precursors under same conditions, monoclinic structured Pd5Bi2 conventional face-centered cubic (fcc) Pd3Bi with comparable size...

We have previously shown that Pt–Ni alloy nano-octahedra with {111} facets exhibit outstanding electrochemical performance in the oxygen reduction reaction (ORR) acidic media when their surfaces are finely tailored at atomic level. In this investigation, we further refine surface structure of Pt2.2Ni octahedral nanocatalysts to improve ORR a 0.1 M KOH solution using diverse manipulation techniques. Through systematic analysis CO stripping, cyclic voltammetry, and X-ray photoelectron...

Colloidal MoS2nanoparticles with diameters of less than 10 nm were prepared a simple solvothermal method and demonstrated high efficiency in catalyzing H2 evolution Ru(bpy)32+-based molecular systems under visible light.

Abstract Efficient basic hydrotalcite (HT)‐supported gold nanoparticle (AuNP) catalysts have been developed for the aerobic oxidative tandem synthesis of methyl esters and imines from primary alcohols catalyzed under mild soluble‐base‐free conditions. The catalytic performance can be fine‐tuned these cascade reactions by simple adjustment Mg/Al atomic ratio HT support. one‐pot benefits high basicity (Mg/Al=5), whereas moderate greatly improves imine selectivity (Mg/Al=2). These outperform...

SignificanceDynamically understanding the microscopic processes governing ordering transformations has rarely been attained. The situation becomes even more challenging for nanoscale alloys, where significantly increased surface-area-to-volume ratio not only opens up a variety of additional freedoms to initiate an transformation but also allows kinetic interplay between surface and bulk due their close proximity. We provide direct evidence controlling through surface-bulk in Pt-Fe nanoalloys...

This study demonstrates an atomic composition manipulation on Pt-Ni nano-octahedra to enhance their electrocatalytic performance. By selectively extracting Ni atoms from the {111} facets of using gaseous carbon monoxide at elevated temperature, a Pt-rich shell is formed, resulting in ∼2 layer Pt-skin. The surface-engineered octahedral nanocatalyst exhibits significant enhancement both mass activity (∼1.8-fold) and specific (∼2.2-fold) toward oxygen reduction reaction compared with its...

Surface-structure engineering represents an attractive strategy to optimize the energy conversion performance of nanocatalysts using their deliberately controlled exposed facets. To further exploit potential non-Pt-group metal-based spinel catalysts for alkaline oxygen reduction reaction (ORR), a cathodic fuel cell reaction, we hereby report ORR improvement by controlling crystallographic facets ultra-small CuMn2O4 through developed colloidal synthesis approach. The nanocrystals with...

We present a facile colloidal synthesis method to produce uniform-sized (9 nm) CoMn2O4 spinel nano-octahedra tailored with {101} facets. These demonstrate enhanced electrocatalytic activity for the oxygen reduction reaction (ORR) in alkaline media compared their spherical counterparts and previously reported electrocatalysts. At 0.85 V, they achieve high mass (MA) of 60.0 A/g, surpassing (38.6 A/g). Moreover, exhibit favorable stability, maintaining an MA 47.2 A/g after 10 000 durability...

This study outlines the preparation and characterization of a unique superlattice composed indium oxide (In2O3) vertex-truncated nano-octahedra, along with an exploration its response to high-pressure conditions. Transmission electron microscopy scanning transmission were employed determine average circumradius (15.2 nm) these building blocks their planar superstructure. The resilience pressure variations, peaking at 18.01 GPa, examined using synchrotron-based wide-angle X-ray scattering...

Tin(IV) oxide nanocrystals (SnO2 NCs) have significant potential in various applications, with their performance closely related to band gap. The gap is influenced by the size and shape of NCs, which can be precisely controlled adjusting reaction conditions. In this study, we present deliberately designed synthesis protocols produce high-quality SnO2 NCs tunable gaps using different methods. Key factors affecting include control oxidizing agent, temperature, solvent selection, time...

Abstract A nanoporous (np) Au−Cu−Pt thin‐film catalyst with a fine structure and tunable composition is synthesized by using facile method involving successive electrodeposition de‐alloying. The structure, electronic state, elemental content, active surface area of the catalyst, along Pt fraction, are characterized and/or determined before after methanol oxidation reaction (MOR) tests through electrochemical ultrahigh vacuum analytical routines. prepared np Au−Cu−(8 % in precursor alloy)Pt...

Litchi downy blight caused by Peronophythora litchii is the most serious disease in litchi production, storage and transportation. Existing identification technology has difficulty identifying sufficiently early, resulting economic losses. Thus, use of diffuse reflectance spectroscopy to identify at different stages disease, particularly achieve early blight, very important. The spectral data fruits inoculated with P. were collected wavelength range 350–1350 nm. According duration...

The preparation of mesoporous silica SBA-15 with high iron loadings (14−90 wt % Fe2O3) as a suitable support for gold nanoparticles to be used in CO oxidation catalysis has been investigated. materials were prepared by direct hydrothermal two-step pH adjusting method which consisted the formation mesophase at low and inclusion Fe3+ varying range 2−7. characterized XRD, SEM, TEM/EDX, N2 porosimetry, 57Fe Mössbauer spectroscopy. At relatively Fe loading, structure is maintained predominantly...

Abstract We present a one‐pot colloidal synthesis method for producing monodisperse multi‐metal (Co, Mn, and Fe) spinel nanocrystals (NCs), including nanocubes, nano‐octahedra, concave nanocubes. This study explores the mechanism of morphology control, showcasing pivotal roles metal precursors capping ligands in determining exposed crystal planes on NC surface. The cubic NCs, terminated with exclusive {100}‐facets, demonstrate superior electrocatalytic activity oxygen reduction reaction...

Despite the critical role of sintering phenomena in constraining long-term durability nanosized particles, a clear understanding nanoparticle has remained elusive due to challenges atomically tracking neck initiation and discerning different mechanisms. Through integration situ transmission electron microscopy atomistic modeling, this study uncovers atomic dynamics governing Pt–Fe nanoparticles via surface self-diffusion process, allowing for coalescence without significant particle...

Among the multi-metallic nanocatalysts, Pt-based alloy nanocrystals (NCs) have demonstrated promising performance in fuel cells and water electrolyzers. Herein, we demonstrate a facile colloidal synthesis of monodisperse trimetallic Pt-Fe-Ni NCs through co-reduction metal precursors. The as-synthesized ternary exhibit superior mass specific activities toward oxygen reduction reaction (ORR), which are ∼2.8 5.6 times as high those benchmark Pt/C catalyst, respectively. ORR activity...

Abstract Fabrication of 3 d metal‐based core@shell nanocatalysts with engineered Pt‐surfaces provides an effective approach for improving the catalytic performance. The challenges in such preparation include shape control metallic cores and thickness Pt‐based shells. Herein, we report a colloidal seed‐mediated method to prepare octahedral CuNi@Pt‐Cu nanocrystals using CuNi as template. By precisely controlling synthesis conditions including deposition rate diffusion shell‐formation through...