23 research outputs found
Alkaline Ammonia Electrolysis on Electrodeposited Platinum for Controllable Hydrogen Production
No full textDFT calculations of ammonia oxidation reactions on bimetallic clusters of platinum and iridium
No full textUnderpotential Deposition-Induced Synthesis of Composition-Tunable PtCu Nanocrystals and Their Catalytic Properties
No full textGraphene-Supported Pt, Ir, and Pt-Ir Nanoparticles as Electrocatalysts for the Oxidation of Ammonia
No full textPtSn Electrocatalyst Supported on MWCNT-COOH: Investigating the Ethanol Oxidation Reaction
No full textPt3Sn2 (a : a) electrocatalysts with 20% metal loading on multi-walled carbon nanotube supports functionalized with carboxylic acid groups (MWCNT-COOH) were prepared for studies on the ethanol oxidation reaction (EOR). Preparing and anchoring of the metallic nanoparticles increased the hydrophilicity of MWCNT-COOH and decreased its surface roughness to a value close to that of the commercial electrocatalyst Pt3Sn1/C E-TEK. Pt3Sn2/MWCNT-COOH consisted of 32% Pt3Sn alloy with a lattice parameter of 0.3979 nm. The mean particle size of 3.85 +/- 1.17 nm was measured by high-resolution transmission electron microscopy (HRTEM). The onset oxidation potential obtained for the EOR (in the cyclic voltammetry experiments) using Pt3Sn2/MWCNT-COOH was the lowest (0.21 V vs. reversible hydrogen electrode (RHE)), with a normalized current peak of 250 mAmg(Pt)(-1). The highest normalized current in the chronoamperometric measurements for the EOR after 1800 seconds at 0.5 V (RHE) was 16 mAmg(Pt)(-1), whereas for Pt3Sn1/C E-TEK it was 10 mAmg(Pt)(-1). FTIR-ATR in situ analysis showed that the Pt3Sn2/MWCNT-COOH electrocatalyst favoured acetaldehyde production at lower potentials and CO2 production at potentials greater than 0.5 V. In addition, the presence of oxygenated functional groups on the nanotube surfaces together with the anchoring of Pt and SnO2 formation contributed to the oxidation of ethanol to CO2 (bifunctional mechanism), enhancing the electrocatalytic activity of the material compared to commercial Pt3Sn1/C E-TEK.Univ Fed ABC, Ctr Ciencias Nat & Humanas, Lab Eletroquim & Mat Nanoestruturados, Rua Santa Adelia 166, BR-09210170 Santo Andre, SP, BrazilUniv São Paulo, Inst Quim, Dept Quim Fundamental, Ave Prof Lineu Prestes 748, BR-05508000 São Paulo, SP, BrazilUniv Fed São Paulo, Dept Ciencias Mar, Campus Baixada Santista, BR-11030400 Ponta Da Praia Santos, SP, BrazilUniv Fed Sao Carlos, Dept Quim, Rodovia Washington Luis Km 235, BR-13565905 Sao Carlos, SP, BrazilUniv Fed São Paulo, Dept Ciencias Mar, Campus Baixada Santista, BR-11030400 Ponta Da Praia Santos, SP, BrazilWeb of Scienc
Ammonia electro-oxidation reaction: Recent development in mechanistic understanding and electrocatalyst design
No full textPtSn Electrocatalyst Supported on MWCNT-COOH: Investigating the Ethanol Oxidation Reaction
No full textHyperbranched concave octahedron of PtIrCu nanocrystals with high-index facets for efficiently electrochemical ammonia oxidation reaction
No full textElectrochemical oxidation of ammonia by multi-wall-carbon-nanotube-supported Pt shell–Ir core nanoparticles synthesized by an improved Cu short circuit deposition method
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