Rakesh Kumar Karn

SASTRA University

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Pramod K. Singh

Sharda University

Krishnamoorthy Pandiyan

Covesion (United Kingdom)

Vijay Singh

Konkuk University

O. N. Srivastava

Botanical Survey of India

Shanmugam Boomadevi

National Institute of Technology Tiruchirappalli

Alexander Berman

Weizmann Institute of Science

Michael Epstein

PA Consulting Group

R. Utrilla

Instituto de Carboquímica

P. Karthick

Hindustan Institute of Technology and Science

Jean‐Noël Rouzaud

Centre National de la Recherche Scientifique

Cooperative Institutions

SASTRA University

Consejo Superior de Investigaciones Científicas

Instituto de Carboquímica

Banaras Hindu University

Centre National de la Recherche Scientifique

Indian Institute of Technology BHU

Anna University, Chennai

Universidad de Zaragoza

Tamil University

Pusan National University

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Studies on PV assisted PEC solar cells for hydrogen production through photoelectrolysis of water

International Journal of Hydrogen Energy (2002)

P. K. Shukla Rakesh Kumar Karn Ashish Kumar Singh O. N. Srivastava

Photoelectrolysis

Photoelectrochemical cell

Open-circuit voltage

Rutile

Electrolytic cell

10.1016/s0360-3199(01)00095-7

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Citations (40)

Unidirectional seeded growth of l-Glutamic acid hydrobromide single crystal and its characterization

Phase Transitions (2019)

M. Senthilkumar Pramod K. Singh Vijay Singh R. Sathyalakshmi Krishnamoorthy Pandiyan

l-Glutamic acid hydrobromide single crystals were grown by Sankaranarayanan–Ramasamy (SR) method for the first time. Seed crystals were prepared from the solvent evaporation technique. Using single-crystal X-ray diffraction (XRD) analysis, the crystal system and the cell parameters were determined. The TG/DTA analysis shows that the crystal is stable up to 200°C and further increase of temperature decomposition was observed. The crystal has a sharp cutoff around 230 nm and is transparent in the UV region. High-resolution XRD curve of 22 arc s FWHM shows the excellent crystallinity nature. Further, the Vicker's hardness test proved that the hardness of the crystal grown using SR method is found to be higher than the crystal grown with the conventional solution grown technique. Etching studies were performed to find the growth pattern and the results are presented and discussed in detail.

Hydrobromide

Crystal (programming language)

Seed crystal

10.1080/01411594.2019.1670831

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Citations (6)

Semiconductor-septum photoelectrochemical cell for solar hydrogen production

International Journal of Hydrogen Energy (2000)

Rakesh Kumar Karn

Photoelectrochemical cell

Quantum Efficiency

10.1016/s0360-3199(99)00053-1

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Citations (16)

Steam reforming of methane on a Ru/Al2O3 catalyst promoted with Mn oxides for solar hydrogen production

Green Chemistry (2007)

Alexander Berman Rakesh Kumar Karn Michael Epstein

A new type of solar heated reformers have been developed in recent years. In these reactors, called volumetric reformers, concentrated solar radiation directly illuminates the catalyst through a transparent window. This new type of solar reformer can operate at higher temperatures (1000–1100 °C), since the surface temperature limit of a regular metal tube reactor used in the industry is eliminated and a much higher heating rate is feasible. In the last few years the Weizmann Institute has gathered experience in developing high temperature steam reforming catalysts for its "DIAPR-Kippod" based volumetric reformer. The configuration of the absorber in this reformer is an array of ceramic pins. The thermal stability of the catalysts is crucial for the viability of such reactors. Ru/Al2O3 catalysts promoted with Mn oxides are studied. The effect of Mn on the dispersion and sintering of the Ru particles is investigated in the present work with the aid of TEM and EDS. It was found that addition of Mn oxides decreases in the rate of the sintering of the Ru particles. Catalytic elements for use in a volumetric reformer have been developed and tested. The Ru/Al2O3 catalyst promoted with Mn oxides was supported on ceramic pins (made of alumina) by wash coating. The long-term test confirmed the chemical and thermal stability of the catalyst even after operating for 500 hours at 1100 °C.

Solar furnace

Thermal Stability

Methane reformer

10.1039/b613708n

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Citations (41)

Studies on thin films of TiO₂ for resistance-based sensing of ethanol vapor at room temperature

Phase Transitions (2019)

Ravi Shankar Toijam Sunder Meetei Shanmugam Boomadevi P. Karthick K. Jeyadheepan

We investigate the gas sensing properties of TiO2 thin films prepared by spin coating. The presence of anatase and rutile phases in the sample was confirmed by powder X-Ray diffraction study. The thin film was characterized by FE-SEM and EDAX. The TiO2 thin films were found to have good sensitivity towards ethanol compared to other gases. The sensing studies revealed the ethanol sensing properties of the thin film at room temperature even at lower concentrations. The response and selectivity of the film were also discussed in detail.

Rutile

Spin Coating

10.1080/01411594.2019.1642474

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Citations (3)

High temperature iron-based catalysts for hydrogen and nanostructured carbon production by methane decomposition

International Journal of Hydrogen Energy (2011)

J.L. Pinilla R. Utrilla Rakesh Kumar Karn I. Suelves M.J. Lázaro

Carbon fibers

Space velocity

10.1016/j.ijhydene.2011.01.184

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Citations (131)

On the synthesis and photochemical studies of nanostructured TiO2 and TiO2 admixed VO2 photoelectrodes in regard to hydrogen production through photoelectrolysis

International Journal of Hydrogen Energy (1999)

Rakesh Kumar Karn

Photoelectrolysis

10.1016/s0360-3199(98)00135-9

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Citations (11)

On the synthesis of nanostructured TiO2 anatase phase and the development of the photoelectrochemical solar cell

International Journal of Hydrogen Energy (1999)

Rakesh Kumar Karn O. N. Srivastava

Rutile

10.1016/s0360-3199(98)00009-3

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Citations (22)

On the structural and photochemical studies of In2O3-admixed nanostructured TiO2 with regard to hydrogen production through photoelectrolysis

International Journal of Hydrogen Energy (1998)

Rakesh Kumar Karn

Photoelectrolysis

Photocurrent

Reversible hydrogen electrode

Photoelectrochemical cell

Electrolysis of water

10.1016/s0360-3199(97)00085-2

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Citations (11)

A New Catalyst System for High-Temperature Solar Reforming of Methane

Energy & Fuels (2005)

Alexander Berman Rakesh Kumar Karn Michael Epstein

A new type of solar-heated reformer, called the volumetric reformer, has been recently developed. In this reformer, the concentrated solar radiation directly illuminates the catalyst through a transparent window. This new type of solar reformer can operate at a temperature range of 1273−1373 K, higher than that common in industrial reformers. Different configurations of the catalyst substrate in these volumetric reformers have been reported in the literature. This article describes a catalytic system specifically applied in the directly irradiated annular pressurized receiver (DIAPR), which was developed at the Weizmann Institute of Science for operation at high temperatures and pressures. The catalytic system based on the DIAPR concept was constructed on an array of ceramic pins loaded with catalyst. Cost-effective catalytic elements that will be implemented in this type of volumetric reformer were developed in the present work. A Ru/Al2O3 catalyst promoted with Mn oxides was supported on ceramic pins (made of alumina) by wash coating. The catalyst was characterized by SEM, XRD, and BET. The fresh catalyst contains mainly α-alumina and Mn2O3. Al2O3, Mn3O4, and MnAl2O4 were observed in the XRD pattern after reaction in the temperature range of 773−1473 K. Activity tests were conducted in a tube flow reactor made of sintered alumina (99.7% Al2O3). The results show that the activity of the new catalyst is similar to the activity of the commercial Engelhard 1%Ru/γ-Al2O3 catalyst. However, while the activity of the commercial catalyst decreases drastically when approaching to 1273 K because of phase transformation in the support, the new catalyst is stable even after calcinations at 1373 K for 500 h under argon flow.

Catalytic reforming

Atmospheric temperature range

10.1021/ef0501997

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Citations (42)