Nanoporous trimetallic PdCuAg alloys as efficient electrocatalysts by all-direction accessibility and synergetic effects

Abstract

The nanoporous nanoparticles with their surfaces open to reagents enable good electron/mass transport and overall resistance to aggregation, thus significantly important in electrocatalytic applications. Herein, a simple yet efficient swollen...

Fluorescent sensing platform based on polyethyleneimine‐protected copper nanoclusters for detection of chromium(VI) in real samples

“…In this work, PEI with a molecular weight of 10,000 was used as the protective agent [29] and l ‐ascorbic acid was used to reduce copper ions to prepare PEI‐protected CuNCs (PEI‐CuNCs). Since PEI contains many amino functional groups and has good affinity for metal ions, it can provide templates and protectants for the formation of metal nanomaterials.…”

“…In this work, PEI with a molecular weight of 10,000 was used as the protective agent [29] and L-ascorbic acid was used to reduce copper ions to prepare PEI-protected CuNCs (PEI-CuNCs). Transmission electron microscopy (TEM) was measured with a JEOL 2010-H TEM (Tokyo, Japan).…”

Sphere-like PdNi Alloy: Unveiling the Twin Functional Properties toward Oxygen Reduction and Temperature-Dependent Methanol Oxidation for Alkaline Direct Methanol Fuel Cells

“…Palladium is the most suitable economical substitute for Pt, with similar electronic configurations, which also play a vital role in the electrocatalytic reactions. − Especially under alkaline conditions, Pd-based catalysts have a less vulnerable CO poisoning effect and have higher catalytic activity in oxidation/reduction reactions with superior/comparable catalytic activities than Pt. − However, single-elemental Pd catalysts cannot meet all the demands in the catalytic reaction, such as favorable reaction kinetics, high mass activity, good durability, and low cost toward applications. , Therefore, expanding the research on Pd-based catalysts is considered to be beneficial in DMFC technology. A fine construction of Pd-based alloys by incorporating the 3d transition metal atoms into the Pd atom is proposed as an effective strategy to modify the electronic structure of Pd to achieve outstanding catalytic performance, such as an improved electrochemical surface area, lowering the overpotential with superior durability, and favorable reaction kinetics, owing to the synergistic alloying/bimetallic effect, which is usually not accompanied in the monometallic counterparts or their physical mixtures. − Furthermore, the highly desired controlled structure of these noble metal-based alloy nanoparticles can set the pathway for developing high-performance catalysts in the present/future. The synergistic effect between Pd and transition metals such as M = Cu, Sn, Mo, and Ni has been identified as promising to form Pd-based alloys with improved catalytic behavior, simultaneously lowering the utilization of Pd. ,, Also, PdM bimetallic catalysts play a major role in various oxidation/reduction reactions such as formic acid oxidations, sodium borohydride oxidations, ethanol/methanol oxidations, and oxygen reduction reactions. , Among the transition metals, Ni has been shown to form a uniform alloy with a minimal miscibility gap throughout the crystal structure due to the lower ionization energy (Ni-7.63 eV) than palladium (8.34 eV) .…”

Co-sputtered CuPt/Ag alloy nanoparticles and comparative catalytic performance of mono-, bi-, and tri-metallic nanoparticles in the oxygen reduction reaction

“…Fortunately, metallic alloys are widely applied as electrocatalysts and synthesized in a variety of ways. [2][3][4][5][6][7][8] Therefore, people have been working on alloying Pt with other cheaper metals and on more effective synthesis methods to avoid wastage of Pt. [9][10][11][12][13] Sputtering is a conventional physical technique for preparing thin films on solid substrates from the bulk targets under vacuum and dry conditions.…”