A5041805497- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Electrocatalysts for Energy Conversion
- Advanced Photocatalysis Techniques
- Catalysts for Methane Reforming
- Electron and X-Ray Spectroscopy Techniques
- Conducting polymers and applications
- X-ray Spectroscopy and Fluorescence Analysis
- Graphene research and applications
- Advanced Chemical Physics Studies
- Electronic and Structural Properties of Oxides
- Crystallization and Solubility Studies
- Boron and Carbon Nanomaterials Research
- nanoparticles nucleation surface interactions
- X-ray Diffraction in Crystallography
- Catalysis and Hydrodesulfurization Studies
- Copper-based nanomaterials and applications
- Advanced X-ray Imaging Techniques
- MXene and MAX Phase Materials
- Electrochemical sensors and biosensors
- Diamond and Carbon-based Materials Research
- TiO2 Photocatalysis and Solar Cells
- Semiconductor materials and interfaces
- Gas Sensing Nanomaterials and Sensors
- Catalysis for Biomass Conversion
Diamond Light Source
2020-2023
Banaras Hindu University
2021
ETH Zurich
2016-2020
Institute for Biomedical Engineering
2016-2019
Bioengineering (Switzerland)
2016-2019
National Chemical Laboratory
2013-2018
Paul Scherrer Institute
2017
Visva-Bharati University
2008-2012
Kanya Maha Vidyalaya
2012
Indian Institute of Technology Kharagpur
1973-2010
Development of efficient electrocatalyst based on non-precious metal that favors the four-electron pathway for reduction oxygen in alkaline fuel cell is a challenging task. Herein, we demonstrate new facile route synthesis hybrid functional nitrogen-doped reduced graphene oxide (N-rGO) and Mn3O4 with pronounced electrocatalytic activity towards reaction (ORR) solution. The involves one-step situ both (GO) Mn(VII), growth nanocrystals nitrogen doping onto carbon framework using single...
The critical features of a custom-built laboratory version ambient pressure photoelectron spectrometer (Lab-APPES) are presented. A double front cone differential pumping arrangement and an aperture free design employed in the electrostatic lens regime improve data collection quality. In contrast to conventional X-ray spectrometers (XPS) operating at ultrahigh vacuum (UHV), it is possible explore electronic structure solid surfaces under working conditions or closer with Lab-APPES....
Palladium-based catalysts are attractive for methane combustion on natural gas vehicles at low temperature. By means of ambient pressure X-ray photoelectron spectroscopy, we investigated the reaction a palladium foil exposed to different mixtures increasing Water affects long-term catalyst stability and blocks active sites, ascribed hydroxyl inhibition effect. We such an effect both under steady state transient conditions understand mechanism inhibition. The formation surface sites...
Abstract Photoelectron spectroscopy is an excellent technique to explore chemically complex systems in catalysis. However, due a small mean free path of photoelectrons gas, liquid, and solid media, the study gas–solid, liquid–gas, solid–liquid interfaces, as well liquid homogeneous are serious challenge. With differentially pumped analyzers this limitation ceases exist no longer restricts photoelectron only ultra‐high vacuum conditions. Presently, photoemission studies at tens mbar pressure...
X-ray photoelectron spectroscopy has been employed for the qualitative and quantitative characterization of both model real catalytic surfaces. Recent progress in detection photoelectrons enabled acquisition spectra at pressures up to a few tens millibars. Although reducing pressure gap represents remarkable advantage catalysis, active sites may be short-lived or hidden majority spectator species. Time-resolved experiments, conducted under transient conditions, are suitable strategy...
There is increasing interest in capturing H2 generated from renewables with CO2 to produce methanol. However, renewable hydrogen production expensive and limited quantity compared . Excess the feedstock gas not favorable for hydrogenation methanol, causing low activity poor methanol selectivity. Now, a class of Rh-In catalysts optimal adsorption properties intermediates presented. The catalyst can effectively catalyze synthesis but inhibit reverse water-gas shift reaction under -deficient...
A direct route to convert methane into high-value commodities, such as methanol, with high selectivity is one of the primary challenges in modern chemistry. Copper-exchanged zeolites show remarkable chemical looping process. Although multiple copper species have been proposed active, an situ spectroscopic investigation difficult, because their similar fingerprints. We used ambient pressure X-ray photoelectron spectroscopy investigate actual powder sample. could discriminate between different...
The ambient-pressure endstation and branchline of the Versatile Soft X-ray (VerSoX) beamline B07 at Diamond Light Source serves a very diverse user community studying heterogeneous catalysts, pharmaceuticals biomaterials under realistic conditions, liquids ices, novel electronic, photonic battery materials. instrument facilitates studies near-surface chemical composition, electronic geometric structure variety samples using photoelectron spectroscopy (XPS) near-edge absorption fine-structure...
Abstract We report on H 2 generation by photocatalysis driven simulated white light electronically integrated Au nanoparticles with multifunctional, disordered mesoporous TiO 2− x N (Au‐NT) nanocomposites. Solar (1.5 mmol h −1 g ) from aqueous methanol has been demonstrated Au‐NT The water splitting activity of is attributed to the 21.1 ps lifetime charge carriers observed fluorescence measurements, which indicates a high electron‐injection efficiency nano‐Au conduction band , and hence...
Chemical doping of an electron transporter results in the formation a radical anion containing semiconductor which showed high mobility (13 cm(2) V(-1) s(-1)) at low operating voltage (1 V).
Abstract An attempt was made to shift the temperature regime of oxidation catalysis towards ambient temperatures by employing surface modification (SM) as a handle. Systematic SM Pd(1 1 1) performed O‐atom diffusion into subsurfaces. Virgin and modified catalysts were evaluated for CO oxidation. Typical poisoning observed on virgin surfaces partially lifted, surfaces. followed molecular beam method near‐ambient pressure (NAP) photoelectron spectroscopy under different regimes. UV valence...
Porous boron nitride (BN) has proven promising as a novel class of inorganic materials in the field separations and particularly adsorption. Owing to its high surface area thermal stability, porous BN been researched for CO2 capture water cleaning, instance. However, research remains at laboratory scale due lack understanding formation mechanism BN, which is largely "black box" prevents up. Partial reaction pathways have unveiled, but they omit critical steps formation, including porosity...
Background The prosthetic socket is a key component that influences prosthesis satisfaction, with poorly fitting linked to abandonment and reduced community participation.This paper reviews adjustable designs, as they have the potential improve fit comfort through accommodating residual limb volume fluctuations alleviating undue pressure.Methods Systematic literature patent searches were conducted across multiple databases identify articles patents discussed sockets.The used find companies,...
Catalytic conversion of NO in the presence H2 and O2 has been studied on Pd(111) surfaces, by using a molecular beam instrument with mass spectrometry detection, as function temperature reactants composition. N2 H2O are major products observed, along NH3 N2O minor under all conditions studied. Particular attention paid to influence addition toward dissociation. Although O2-rich compositions were found inhibit deNOx activity Pd catalyst, some enhancement reduction was also observed up certain...
Abstract There is increasing interest in capturing H 2 generated from renewables with CO to produce methanol. However, renewable hydrogen production expensive and limited quantity compared . Excess the feedstock gas not favorable for hydrogenation methanol, causing low activity poor methanol selectivity. Now, a class of Rh‐In catalysts optimal adsorption properties intermediates presented. The catalyst can effectively catalyze synthesis but inhibit reverse water‐gas shift reaction under...
The interaction of water with TiO2 is substantial scientific and technological interest as it determines the activity in photocatalytic environmental applications nanoparticle suspensions water, complex appliances, or pure form interacting vapor. influence nanoparticles on hydrogen bonding structure molecules an important factor that controls hydration other species, reactions, nucleation processes. We use a combination ambient-pressure X-ray photoelectron spectroscopy electron yield...
Abstract We investigated the electrical‐transport properties of hydroiodic acid doped polyaniline in temperature range 77–300 K, applying magnetic field strength to a maximum 1 T frequency 20 Hz–1 MHz. The direct‐current conductivity was explained by variable hopping theory, and magnetoconductivity, which positive, interpreted orbital magnetoconductivity theory. alternating‐current (ac) found follow universal dielectric response σ′( f ) ∝ s , where is frequency‐dependent real part complex ac...
An attempt has been made to bridge the material gap, existing between ideal single crystals and real-world powder nanocatalyst employed in surface science heterogeneous catalysis, respectively. Simple wet chemical method (sol–gel spin-coating deposition) applied make continuous Ce1 − xZrxO2 (x = 0–1) (CZ) thin films with uniform thickness (~40 nm) smooth characteristics. Uniform smoothness of over a large area was supported by variety measurements. Molecular beam (MB) studies O2 adsorption...
A family of boron nitride (BN)-based photocatalysts for solar fuel syntheses have recently emerged. Studies shown that oxygen doping, leading to oxynitride (BNO), can extend light absorption the visible range. However, fundamental question surrounding origin enhanced harvesting and role specific chemical states in BNO photochemistry remains unanswered. Here, using an integrated experimental first-principles-based computational approach, we demonstrate paramagnetic isolated OB3 are paramount...
Abstract Polyaniline nanoparticles have been synthesized through simple micelle technique and then grafted it with silanized silica gel to develop a novel hybrid material. The are characterized by UV‐Vis, TEM, CV, SEM, TGA, DTG, DSC. Silanization grafting reactions evaluated FTIR chemical test. Cr(VI) binding behavior of the composite is studied in various pH medium, both competitive noncompetitive conditions. particle size, adsorption capacity, surface area material found be 100 nm, 135...