FEN BİLİMLERİ ENSTİTÜSÜ/LİSANSÜSTÜ TEZ PROJESİ

METHANOL OXİDATİON ON PT/CNT/ CONDUCTİVE POLYME

FEN BİLİMLERİ ENSTİTÜSÜ/LİSANSÜSTÜ TEZ PROJESİ

METHANOL OXİDATİON ON Pt/CNT CONDUCTİVE POLYME

FEN BİLİMLERİ ENSTİTÜSÜ/LİSANSÜSTÜ TEZ PROJESİ

METANOL YÜKSELTGENME REAKSİYONU İÇİN KULLANILAN KARBON DESTEKLİ PLATİN NANOPARÇACIKLARIN HAZIRLANMASI VE KARAKTERİZASYON

ÇEŞİTLİ İNDİRGEYİCİLER KULLANILARAK HAZIRLANAN KATALİZÖRLERİN VERİMLİLİKLERİ

ÇEŞİTLİ İNDİRGEYİCİLER KULLANILARAK HAZIRLANAN KATALİZÖRLERİN VERİMLİLİKLER

Pt nanoparticles synthesized with new surfactants: improvement in C-1-C-3 alcohol oxidation catalytic activity

Platinum electrocatalysts were prepared using PtCl4 as a starting material and 1-decylamine, N,N-dimethyldecylamine, 1-dodecylamine, N,N-dimethyldodecylamine, 1-hexadecylamine, and 1-octadecylamine as surfactants. These surfactants were used for the first time in this synthesis to determine whether the primary and/or tertiary structure and/or chain length of the surfactants, affects the size and/or activity of the catalysts in C-1-C-3 alcohol electro-oxidation reactions. Electrochemical measurements (cyclic voltammetry and chronoamperometry) indicated that the highest electrocatalytic performance was observed for the Pt nanocatalysts that were stabilized by N,N-dimethyldecylamine, and this has a tertiary amine structure with a short chain length (R = C10H21). The high performance may be due to the high electrochemical surface area, Pt(0)/Pt(IV) ratio, %Pt utility, and roughness factor (R (f)). X-ray photoelectron spectroscopy, X-ray diffraction, atomic force microscopy, and transmission electron microscopy were used to determine the parameters that affect the catalytic activities

DFT STUDIES ON f-CNT AND COMPARISON WİTH EXPERIMENTAL RESULTS

DFT STUDIES ON f-CNT AND COMPARISON WİTH EXPERIMENTAL RESULT

METANOL YÜKSELTGENME REAKSİYONU İÇİN KULLANILAN KARBON DESTEKLİ PLATİN NANOPARÇACIKLARIN HAZIRLANMASI VE KARAKTERİZASYONU

METANOL YÜKSELTGENME REAKSİYONU İÇİN KULLANILAN KARBON DESTEKLİ PLATİN NANOPARÇACIKLARIN HAZIRLANMASI VE KARAKTERİZASYON

FEN BİLİMLERİ ENSTİTÜSÜ/LİSANSÜSTÜ TEZ PROJESİ

METANOL YÜKSELTGENME TEPKİMESİ İÇİN YENİ SÜRFAKTANLAR VE DEĞİŞİK İNDİRGEYİCİLER KULLANARAK KARBON DESTEKLİ PT NANOPARÇACIKLARININ HAZIRLANMAS

Preparation and characterization of nano-sized Pt-Ru/C catalysts and their superior catalytic activities for methanol and ethanol oxidation

Carbon-supported PtRu nanoparticles (Ru/Pt: 0.25) were prepared by three different methods; simultaneous reduction of PtCl(4) and RuCl(3) (catalyst I) and changing the reduction order of PtCl4 and RuCl3 (catalysts II and III) to enhance the performance of the anodic catalysts for methanol and ethanol oxidation. Structure, microstructure and surface characterizations of all the catalysts were carried out by X-ray diffraction (XRD), transmission electron microscopy (TEM) coupled with energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The results of the XRD analysis showed that all catalysts had a face-centered cubic (fcc) structure with different and smaller lattice parameters than that of pure platinum, showing that the Ru incorporates into the Pt fcc structure by different ratios in all the catalysts. The typical particle sizes of all catalysts were in the range of 2-3 nm. The most active and stable catalyst for methanol and ethanol oxidation is catalyst III, in which a large amount (more than 90%) of PtRu alloy formation was observed. It has been found that this catalyst is about 8.0 and 33.4 times more active at similar to 0.60 V towards the methanol and ethanol oxidation reactions, respectively, compared to the commercial Pt catalyst