A5004692445- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Electrocatalysts for Energy Conversion
- Electronic and Structural Properties of Oxides
- Semiconductor materials and devices
- Advanced Photocatalysis Techniques
- Advancements in Battery Materials
- Copper-based nanomaterials and applications
- Advanced battery technologies research
- Solid-state spectroscopy and crystallography
- Iron oxide chemistry and applications
- Electrochemical Analysis and Applications
- Conducting polymers and applications
- Advanced Battery Materials and Technologies
- TiO2 Photocatalysis and Solar Cells
- Advanced Sensor and Energy Harvesting Materials
- Electron and X-Ray Spectroscopy Techniques
- Supercapacitor Materials and Fabrication
- Transition Metal Oxide Nanomaterials
- Catalytic Processes in Materials Science
- Magnetic Properties and Synthesis of Ferrites
- Extraction and Separation Processes
- Mine drainage and remediation techniques
- Nanowire Synthesis and Applications
University of Stuttgart
2023-2024
Forschungszentrum Jülich
2023-2024
Oxford Photovoltaics (United Kingdom)
2023
Karlsruhe Institute of Technology
2019-2022
Brandenburg University of Technology Cottbus-Senftenberg
2012-2021
Applied Materials (Germany)
2019-2021
Helmholtz Association of German Research Centres
2021
Technical University of Darmstadt
2016-2020
University of Burdwan
2018
Carl-Thiem-Klinikum Cottbus
2017
Catalytic water splitting to hydrogen and oxygen is considered as one of the convenient routes for sustainable energy conversion. Bifunctional catalysts electrocatalytic reduction reaction (ORR) evolution (OER) are pivotal conversion storage, alternatively, photochemical oxidation in biomimetic fashion also most useful way convert solar into chemical energy. Here we present a facile solvothermal route control synthesis amorphous crystalline cobalt iron oxides by controlling crystallinity...
A systematic structural elucidation of the near-surface active species two remarkably nickel phosphides Ni12P5 and Ni2P on basis extensive analytical, microscopic, spectroscopic investigations is reported. The latter can serve as complementary efficient electrocatalysts in hydrogen (HER) versus oxygen evolution reaction (OER) alkaline media. In OER shows enhanced performance over due to higher concentration this phase, which enables formation an amorphous NiOOH/Ni(OH)2 shell a modified...
Nanostructured titanium dioxide is one of the classic materials for photoelectrochemical water splitting. In present work we dope TiO2 nanotube anodes. For this, various low concentration bulk-Nb-doped layers were grown by self-organizing anodization Ti–Nb alloys. At Nb-contents around 0.1 at%, and after an adequate heat-treatment, a strongly increased stable water-splitting rate obtained.
Abstract In this work, solar cells with a freshly made CH 3 NH PbI perovskite film showed power conversion efficiency (PCE) of 15.4 % whereas the one 50 days aged only 6.1 %. However, when was covered layer Al 2 O deposited by atomic deposition (ALD) at room temperature (RT), PCE value clearly enhanced. X‐ray photoelectron spectroscopy study that ALD precursors are chemically active surface and passivate it. Moreover, RT‐ALD‐Al ‐covered films enhanced ambient air stability.
Abstract Sodium‐ion batteries (NIBs) are promising energy‐storage devices with advantages such as low cost and highly abundant raw materials. To probe the electrochemical properties of NIBs, sodium metal is most frequently applied reference and/or counter electrode in state‐of‐the‐art literature. However, high reactivity its impact on performance usually neglected. In this study, it shown that spontaneous reactions organic electrolytes importance critical interpretation experiments...
Water-soluble binders such as poly (acrylic acid) (PAA) possess many advantages in the slurry and electrode preparation due to their low-cost environmental friendliness. However, linear nature of these binders, they are susceptible slide under continuous volume variation Si-containing anodes during cycling. Therefore, a three-dimensional (3D) interconnected polymeric network is required provide robust mechanical adhesion with Si particles maintain integrity for excellent cycle stability....
Interface engineering is a common strategy for passivating surface defects to attain open circuit voltages (Voc) in perovskite solar cells (PSCs). In this work, we introduce the concept of polishing thin-film using nanosecond (ns) pulsed ultraviolet laser reduce defects, such as dangling bonds, undesirable phases, and suboptimal stoichiometry. A careful control energy scanning speed improves photophysical properties without compromising thickness. Using polishing, Voc 1.21 V achieved planar...
The most efficient and stable perovskite solar cells (PSCs) are made from a complex mixture of precursors. Typically, to then form thin film, an extreme oversaturation the precursor is initiated trigger nucleation sites, e.g., by vacuum, airstream, or so-called antisolvent. Unfortunately, triggers do not expel lingering (and highly coordinating) dimethyl sulfoxide (DMSO), which used as solvent, films; this detrimentally affects long-term stability. In work, (the green) sulfide (DMS)...
Perovskite solar cells (PSCs) excel in achieving high open-circuit voltages (VOC) for narrow bandgaps (∼1.6 eV) but face challenges with wide-bandgap perovskites, like methylammonium lead trichloride (MAPbCl3) a 3.03 eV bandgap. These materials are transparent visible absorbing ultraviolet (UV) light. However, uniform film crystallization remains hurdle. Here, we enhance MAPbCl3 by manipulating annealing atmospheres (nitrogen, air, and MACl vapor). Excess vapor improves surface coverage,...
Abstract This work introduces a simplified deposition procedure for multidimensional (2D/3D) perovskite thin films, integrating phenethylammonium chloride (PEACl)‐treatment into the antisolvent step when forming 3D perovskite. simultaneous and passivation strategy reduces number of synthesis steps while simultaneously stabilizing halide film improving photovoltaic performance resulting solar cell devices to 20.8%. Using combination multimodal in situ additional ex characterizations, it is...
All-inorganic perovskites, such as CsPbI2Br, have emerged promising compositions due to their enhanced thermal stability. However, they face significant challenges susceptibility humidity. In this work,...
The present work shows a significant enhancement of the photoelectrochemical water-splitting performance anodic TiO2 nanotube layers grown on low concentration (0.01−0.2 at% Ru) Ti−Ru alloys. Under optimized preparation conditions (0.05 Ru, 450 °C annealing) water splitting rate oxide tubes could be 6-fold increased. Moreover, beneficial effect is very stable with illumination time; this in contrast to other typical doping approaches TiO2.
Mixed oxide photocatalysts: WO3- containing TiO2 nanotubes were prepared by self-organizing electrochemical anodization of TiW alloys (Ti 0.2 W see figure, and Ti 9 W). It is shown that a content only at % WO3 with respect to the titania leads very significant increase photocatalytic reaction rate compared not pure anatase nanotubes, but also in comparison any other modified nanotube system reported up now. Detailed facts importance specialist readers are published as "Supporting...
Room temperature partial oxidation (corrosion) of cubic CoO led to the formation mixed valence CoO<sub>x</sub>with better electrochemical water activities in alkaline pH. Activation both octahedral Co<sup>3+</sup>and Co<sup>2+</sup>to layered oxohydroxide–hydroxide during has been demonstrated.
Organic–inorganic hybrid perovskite solar cells achieved a record efficiency of almost 23% in only short time span time.
The Li<sup>+</sup> storage mechanism in a carbon composited zinc sulfide as an enhanced conversion-alloying anode material for ion batteries is studied by <italic>in situ</italic> methods. Further, it found that the (de)lithiation processes are affected low charge transfer resistance, and coated can effectively improve long-term cycling stability.
Multi-shelled hollow spheres of cobalt manganese oxides (CMOs) deposited on Ni foam exhibited superior alkaline electrochemical water oxidation activity and surpassed those bulk CMO commercial noble metal-based catalysts. A higher amount in the spinel structure resulted transformation tetragonal to cubic phase with a decrease overpotential oxygen evolution.
Abstract High power conversion efficiency (PCE) perovskite solar cells (PSCs) rely on optimal alignment of the energy bands between absorber and adjacent charge extraction layers. However, since most materials devices high performance are prepared by solution‐based techniques, a deposition films with thicknesses few nanometers therefore detailed analysis surface interface properties remains difficult. To identify respective photoactive interfaces, photoelectron spectroscopy measurements...
Iodide migration causes degradation of the perovskite solar cells. Here, we observe direct iodide into hole-transport layer in a device. We demonstrate that ultrathin room temperature atomic layer-deposited Al2O3 on surface very effectively hinders migration. The perovskite-Al2O3 interface enables charge transfer across cells, without causing any drastic changes properties absorber. Furthermore, it helps to preserve initial film during exposure light and air under real operating conditions,...
Abstract LiNi 0.5 Mn 1.5 O 4 (LNMO) is a promising cathode in lithium‐ion batteries (LIBs) due to its high operating voltage and open Li + diffusion framework. However, the instability of electrode–electrolyte interface negative environmental impact electrode fabrication processes limit practical application. Therefore, switching processing conditions aqueous understanding accompanying surface structural evolution are imperative. Here, water‐treated, poly(acrylic acid) (PAA)‐treated, H 3 PO...
Interfaces in perovskite solar cells play a crucial role their overall performance, and therefore, detailed fundamental studies are needed for better understanding. In the case of classical n-i-p architecture, TiO2 is one most used electron-selective layers can induce chemical reactions that influence performance device stack. The interfacial properties at TiO2/perovskite interface often neglected, owing to difficulty accessing this interface. Here, we use X-rays variable energies study...