A5039985056- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Graphene research and applications
- Supercapacitor Materials and Fabrication
- Advanced Battery Technologies Research
- Semiconductor materials and devices
- Conducting polymers and applications
- Electron and X-Ray Spectroscopy Techniques
- ZnO doping and properties
- Crystallization and Solubility Studies
- Ionic liquids properties and applications
- X-ray Diffraction in Crystallography
- Extraction and Separation Processes
- Carbon Nanotubes in Composites
- Chalcogenide Semiconductor Thin Films
- Machine Learning in Materials Science
- Catalytic Processes in Materials Science
- Inorganic Chemistry and Materials
- Thin-Film Transistor Technologies
- Advanced Memory and Neural Computing
- TiO2 Photocatalysis and Solar Cells
- CO2 Reduction Techniques and Catalysts
- Gas Sensing Nanomaterials and Sensors
- Advanced Sensor and Energy Harvesting Materials
- Ga2O3 and related materials
CEA LITEN
2015-2024
Université Grenoble Alpes
2015-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
CEA Grenoble
2016-2024
Samsung (South Korea)
2008-2016
Institut polytechnique de Grenoble
2016
Uganda Martyrs University
2016
Yong In University
2014
Suwon Research Institute
2014
SAIT Polytechnic
2010-2013
Abstract The conductivity of graphite oxide films is modulated using reducing agents. It found that the sheet resistance film reduced sodium borohydride (NaBH 4 ) much lower than hydrazine (N 2 H ). This attributed to formation CN groups in N case, which may act as donors compensating hole carriers oxide. In case NaBH reduction, interlayer distance first slightly expanded by intermediate boron complexes and then contracted gradual removal carbonyl hydroxyl along with complexes. fabricated...
To modify oxide structure and introduce a thin conductive film on Li4Ti5O12, thermal nitridation was adopted for the first time. NH3 decomposes surface Li4Ti5O12 to TiN at high temperature, surprisingly, it also modifies in way accommodate single phase Li insertion extraction. The electrochemically induced Li4+deltaTi5O12 with coating layer shows great electrochemical properties current densities.
Chemically bonded graphene/carbon nanotube composites as flexible supercapacitor electrode materials are synthesized by amide bonding. Carbon nanotubes attached along the edges and onto surface of graphene act spacers to increase electrolyte-accessible area. Our lamellar structure electrodes demonstrate largest volumetric capacitance (165 F cm-3) ever shown carbon-based electrodes.
Poly(3,4-ethylenedioxythiophene) (PEDOT) is certainly the most known and used conductive polymer because it commercially available shows great potential for organic electronic, photovoltaic, thermoelectric applications. Studies dedicated to PEDOT films have led high conductivity enhancements. However, an exhaustive understanding of mechanisms governing such enhancement still lacking, hindered by semicrystalline nature material itself. In this article, we report development highly controlling...
We investigated the modulation of optical properties single-walled carbon nanotubes (SWCNTs) by AuCl 3 doping. The van Hove singularity transitions (E 11 (S), E 22 (M)) in absorption spectroscopy disappeared gradually with an increasing doping concentration and a new peak appeared at high concentration. work function was downshifted up to 0.42 eV strong charge transfer from SWCNTs level p-doping. propose that this large shift forces Fermi be located deep valence band, i.e., highly...
Various electron-donating and -withdrawing groups in aromatic aliphatic backbones of solvent have been introduced to tailor the electronic structures single-walled carbon nanotubes (SWCNTs). In case with a withdrawing group, electrons were extracted mainly from metallic SWCNTs, whereas small charge transfer was also observed semiconducting SWCNTs. On other hand, donating donated both This effect less prominent an backbone than that backbone. The strong correlation between sheet resistance is...
The effects of various metal electrodes on the resistive switching NiO thin films were investigated. Contrary to belief that Pt is used for its high work function, which enables Ohmic contact p-type NiO, was observed in with Ta or Al a low function as-deposited state. Ag Cu top electrode and free energy oxidation shows importance formation an oxide layer at metal/NiO interface.
Single-walled carbon nanotubes (SWCNTs) dispersed with Nafion in a solvent mixture containing de-ionized water and 1-propanol (bisolvent) were sprayed on poly(ethylene terephthalate) substrate to fabricate flexible transparent conducting films (TCFs). Different SWCNT-to-Nafion ratios used optimize the film performance of transparence sheet resistance. The TCFs then immersed nitric acid. These steps resulted p-type doping due presence SWCNT network de-doping (removal effect) by acid...
Does the Li4Ti5O12 electrode need a carbon additive in lithium-ion batteries? We answered this question our previous work by showing that partially reduced Ti4+ on surface of could provide enough electronic conductivity to initiate electrochemical process. In work, we discuss generally accepted fact solid electrolyte interphase (SEI) is hardly formed owing its high redox potential using carbon-free exclude influences carbon. contrast argument, was found have certain reactivity towards...
Abstract The timely arrival of novel materials plays a key role in bringing advances to society, as the pace at which major technological breakthroughs take place is usually dictated by discovery rate are identified within chemical space. High‐throughput experimentation and computation strategy, now widely considered watershed accelerating optimization virtually every field, enables simultaneous screening, synthesis characterization large arrays different material classes toward...
Abstract Driven by the continuous search for improving performances, understanding phenomena at electrode/electrolyte interfaces has become an overriding factor success of sustainable and efficient battery technologies mobile stationary applications. Toward this goal, rapid advances have been made regarding simulations/modeling techniques characterization approaches, including high‐throughput electrochemical measurements coupled with spectroscopies. Focusing on Li‐ion batteries, current...
CO2 has attracted much attention as a C1 feedstock for synthetic fuels via its selective catalytic hydrogenation to liquid hydrocarbons. One strategy is the reduction of CO through reverse water–gas shift (RWGS) reaction, followed by CO. In this work, potassium tris(tert-butoxy)ferrate, [{(THF)2KFe(OtBu)3}2], was supported on alumina that had been partially dehydroxylated at 500 °C (Al2O3–500), and resulting catalyst investigated in The active site precursor identified...
A carbon-free Li(4)Ti(5)O(12) electrode has shown excellent electrochemical performance without any effort to enhance the electrical conductivity. Partial reduction of Ti(4+) and a metallic Li(7)Ti(5)O(12) phase are suggested be possible origins exceptional behavior.
Li2MoO3, with a Mo(IV)/Mo(VI) redox couple, has been tested as cathode additive to make lithium-ion batteries safe under abnormal discharge conditions. Its high charging capacity and sloping voltage below 3.4 V vs Li+/Li effectively prevents the Cu anode current collector from oxidative dissolution at overdischarge condition. However, molybdenum electrochemically charged Li2MoO3 quickly deteriorates battery performance 45 °C. A solid solution of LiFeO2 stabilized crystalline structure states...
Interest in oxide semiconductors stems from benefits, primarily their ease of process, relatively high mobility (0.3–10 cm2/vs) and wide-bandgap. However, for practical future electronic devices, the channel should be further increased over 50 cm2/vs wide-bandgap is not suitable photo/image sensor applications. The incorporation nitrogen into ZnO semiconductor can tailored to increase mobility, enhance optical absorption whole visible light form uniform micro-structure, satisfying desirable...
Graphene layers are directly synthesized on an oxide substrate without transfer. The catalytic structure aids graphene formation the vaporization of a self-assembled monolayer (SAM) material and induces direct growth substrate. Film uniformity number modulated. process provide robust method for transfer-free with uniform thickness.
3D structuring of the electrode boosts performances molecular-engineered nanomaterials based on bio-inspired nickel-diphosphine catalysts operating at thermodynamic equilibrium in PEMFC relevant conditions.
The performances of lithium-ion batteries depend on the capability electrode materials to exchange lithium ions and electrons faster reversibly. LiNiO2 is a promising candidate for achieving high voltage capacity. However, its industrialization hindered by surface bulk instabilities. These instabilities are due redox processes involving charge transfer between cations anions. Therefore, fundamental understanding based further experimental evidence required resolve cation anion from in...
A new approach of self-compliance bipolar switching tantalum embedded amorphous oxide for highly reliable and uniform was investigated. Based on analytic results, the formation a metallic film confirmed. Robust characteristics over cycles with no change at both resistance states under voltage pulses were achieved due to function, which originated from limitation current by ohmic load resistance. In addition, an oxygen plasma pulse method interface oxidation demonstrated.
For high rate capability and energy density of lithium ion batteries, over-lithiated layered cathodes coated by multiwall carbon nanotube were prepared a novel dry method without decay in the structure.
We report the results of a VAMAS (Versailles Project on Advanced Materials and Standards) interlaboratory study measurement composition in organic depth profiling. Layered samples with known binary compositions Irganox 1010 either 1098 or Fmoc-pentafluoro-l-phenylalanine each layer were manufactured single batch distributed to more than 20 participating laboratories. The analyzed using argon cluster ion sputtering X-ray photoelectron spectroscopy (XPS) time-of-flight secondary mass...