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Dive into the research topics where Egon Kecsenovity is active.

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Featured researches published by Egon Kecsenovity.


Journal of the American Chemical Society | 2017

Enhanced Photoelectrochemical Performance of Cuprous Oxide/Graphene Nanohybrids

Egon Kecsenovity; Balázs Endrődi; Peter S. Toth; Yuqin Zou; Robert A. W. Dryfe; Krishnan Rajeshwar; Csaba Janáky

Combination of an oxide semiconductor with a highly conductive nanocarbon framework (such as graphene or carbon nanotubes) is an attractive avenue to assemble efficient photoelectrodes for solar fuel generation. To fully exploit the possible synergies of the hybrid formation, however, precise knowledge of these systems is required to allow rational design and morphological engineering. In this paper, we present the controlled electrochemical deposition of nanocrystalline p-Cu2O on the surface of different graphene substrates. The developed synthetic protocol allowed tuning of the morphological features of the hybrids as deduced from electron microscopy. (Photo)electrochemical measurements (including photovoltammetry, electrochemical impedance spectroscopy, photocurrent transient analysis) demonstrated better performance for the 2D graphene containing photoelectrodes, compared to the bare Cu2O films, the enhanced performance being rooted in suppressed charge carrier recombination. To elucidate the precise role of graphene, comparative studies were performed with carbon nanotube (CNT) films and 3D graphene foams. These studies revealed, after allowing for the effect of increased surface area, that the 3D graphene substrate outperformed the other two nanocarbons. Its interconnected structure facilitated effective charge separation and transport, leading to better harvesting of the generated photoelectrons. These hybrid assemblies are shown to be potentially attractive candidates in photoelectrochemical energy conversion schemes, namely CO2 reduction.


Scientific Reports | 2017

Influence of synthesis parameters on CCVD growth of vertically aligned carbon nanotubes over aluminum substrate

Anna Szabó; Egon Kecsenovity; Z. Pápa; Tamás Gyulavári; Krisztián Németh; Endre Horváth; Klára Hernádi

In the past two decades, important results have been achieved in the field of carbon nanotube (CNT) research, which revealed that carbon nanotubes have extremely good electrical and mechanical properties The range of applications widens more, if CNTs form a forest-like, vertically aligned structure (VACNT) Although, VACNT-conductive substrate structure could be very advantageous for various applications, to produce proper system without barrier films i.e. with good electrical contact is still a challenge. The aim of the current work is to develop a cheap and easy method for growing carbon nanotubes forests on conductive substrate with the CCVD (Catalytic Chemical Vapor Deposition) technique at 640 °C. The applied catalyst contained Fe and Co and was deposited via dip coating onto an aluminum substrate. In order to control the height of CNT forest several parameters were varied during the both catalyst layer fabrication (e.g. ink concentration, ink composition, dipping speed) and the CCVD synthesis (e.g. gas feeds, reaction time). As-prepared CNT forests were investigated with various methods such as scanning electron microscopy, Raman spectroscopy, and cyclic voltammetry. With such an easy process it was possible to tune both the height and the quality of carbon nanotube forests.


Journal of Nanoscience and Nanotechnology | 2019

Ellipsometric Analysis of Aligned Carbon Nanotubes for Designing Catalytic Support Systems

Z. Pápa; Egon Kecsenovity; J. Csontos; A Szabó; Zsejke-Réka Tóth; J. Budai

Vertically aligned CNT carpets combined with inorganic semiconductors are expected good prospect in practical applications, especially in photocatalysis. If these devices are in production, a fast and non-invasive characterization method will be required. Ellipsometry is widely used in industry as an in-line monitoring tool, so in this study the applicability of ellipsometry for characterizing CNT carpets is investigated. It is shown that ellipsometric evaluation can provide information about the density and the optical properties of the nanotubes; however, the properties of the individual nanotubes (diameter, wall number) can not be taken into account during ellipsometric modeling. To overcome these limitations, numerical simulations are also presented.


international conference on nanotechnology | 2015

CCVD preparation of highly uniform carbon micro- and nanocoil fibers

Anikó Kinka; Egon Kecsenovity; Dóra Fejes; Péter Berki; Klára Hernádi

Micro- and nanosized carbon fibers with special helical structure have many promising applications. These structures can be used as reinforcing materials in polymer composites, wave absorption or tactile sensor elements. In this fiber preparation method the applied catalyst precursor were nickel (II) oxide nanoparticles. Sulfuric modification of nickel containing catalyst grain yields carbon fibers with special coiled structures in acetylene decomposition. The preparation of carbon fiber coils by the CCVD method was carried out between 700- 800 C using thiophene impurity. The catalyst particles and the observed structures were studied by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The lengths of fibers can even reach millimeter size and the average fiber diameter is 1 μm. The diameter of coils is 1-20 μm, the coil pitch is 0.5-1.5 μm. Carbon microcoils might have interesting applications in the near future.


ChemElectroChem | 2016

Electrodeposition of Inorganic Oxide/ Nanocarbon Composites: Opportunities and Challenges

Csaba Janáky; Egon Kecsenovity; Krishnan Rajeshwar


Applied Physics A | 2015

Super growth of vertically aligned carbon nanotubes on pulsed laser deposited catalytic thin films

Dóra Fejes; Z. Pápa; Egon Kecsenovity; Balázs Réti; Z. Toth; Klára Hernádi


ACS Applied Energy Materials | 2018

One-Step Electrodeposition of Nanocrystalline TiO2 Films with Enhanced Photoelectrochemical Performance and Charge Storage

Balázs Endrődi; Egon Kecsenovity; Krishnan Rajeshwar; Csaba Janáky


Physica Status Solidi B-basic Solid State Physics | 2013

Growth and characterization of bamboo‐like carbon nanotubes synthesized on Fe–Co–Cu catalysts prepared by high‐energy ball milling

Egon Kecsenovity; Dóra Fejes; Balázs Réti; Klára Hernádi


Catalysis Today | 2018

Novel synthesis approaches for WO3-TiO2/MWCNT composite photocatalysts- problematic issues of photoactivity enhancement factors

Enikő Bárdos; Gabor Kovacs; Tamás Gyulavári; Krisztián Németh; Egon Kecsenovity; Péter Berki; Lucian Baia; Zsolt Pap; Klára Hernádi


Applied Surface Science | 2018

Height and diameter dependence of carbon nanotube forests on the porosity and thickness of catalytic layers

Z. Pápa; Egon Kecsenovity; Dóra Fejes; J. Budai; Z. Toth; Klára Hernádi

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Z. Pápa

University of Szeged

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Krishnan Rajeshwar

University of Texas at Arlington

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J. Budai

University of Szeged

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