A5077569807- Advanced Battery Materials and Technologies
- Advanced battery technologies research
- MXene and MAX Phase Materials
- Advancements in Battery Materials
- Graphene research and applications
- Advanced Memory and Neural Computing
- Ferroelectric and Negative Capacitance Devices
- Electrocatalysts for Energy Conversion
- Supercapacitor Materials and Fabrication
- Advanced Photocatalysis Techniques
- 2D Materials and Applications
- Extraction and Separation Processes
- Inorganic Fluorides and Related Compounds
- Inorganic Chemistry and Materials
ETH Zurich
2023-2025
By using coordinating anions such as acetate, a water-in-salt-like coordination environment of Zn ions is achieved in relatively dilute conditions, leading to prolonged and efficient cycling zinc metal anodes.
MXenes are 2D transition metal carbides, nitrides, and/or carbonitrides that can be intercalated with cations through chemical or electrochemical pathways. While the insertion of alkali and alkaline earth into Ti3C2Tx is well studied, understanding intercalation redox-active ions its impact on their electronic properties lacking. In this work, we investigate Cu MXene effect properties. Using X-ray absorption spectroscopy (XAS) ab initio molecular dynamics (AIMD), observe an unusual...
This approach utilizes electrostatic attraction of very low fractions (~0.1 wt%) readily reducible fluorinated cations in electrolyte to form a robust fluorine-rich SEI and enable stable Li-metal batteries.
Water-in-salt electrolytes (WISEs) offer extended voltage stability, enabling the use of high-voltage materials in aqueous energy storage systems. The solid-electrolyte interphase (SEI) formed some WISEs plays a key role this enhanced stability by passivating electrode surface. However, non-SEI-forming also exhibit similar window, despite lack an SEI, though mechanism behind remains insufficiently understood. In work, we investigate origins hydrogen evolution reaction (HER) suppression...
Transition metal (TM) cations exhibit distinct electronic properties, compared to alkali and alkaline earth cations. In this work, we aim explore the coupling between different redox-active TMs guest conductive MXene host. Specifically, within confined environment of layers, inserted TM demonstrate varying structures exert influences on MXene. Unlike Cu which undergoes unusual reduction upon insertion MXenes, our Bader charge analysis X-ray absorption spectroscopy (XAS) results indicate that...
Electrolyte engineering in Zn-metal batteries frequently explores the use of alkaline metal supporting salts to enhance conductivity and reduce overpotential for Zn plating stripping. While these additives improve conductivity, presence more mobile alkali cations can negatively affect Zn2+ transference number. Optimizing number is crucial high-rate performance, efficiency, safety, as a high minimizes concentration polarization dendrite formation during high-current cycling. However, reliably...
Controlling solid electrolyte interphase (SEI) in batteries is crucial for their efficient cycling. Herein, we demonstrate an approach to enable robust battery performance that does not rely on high fractions of fluorinated species electrolytes, thus substantially decreasing the environmental footprint and cost high-energy batteries. In this approach, use very low readily reducible cations (~0.1 wt.%) employ electrostatic attraction generate a substantial population these at anode surface....
MXenes are 2D transition metal carbides, nitrides, and/or carbonitrides, capable of intercalation by various cations through chemical or electrochemical means. Previous research has primarily focused on intercalating alkaline and earth cations, such as Li+, K+, Na+, Mg2+ alkylammonium into Ti3C2Tx MXenes. However, the impact intercalated (TM) ions electronic properties remains largely unexplored. In this study, we investigated effects pre-intercalated Cu vice versa to gain a comprehensive...
MXenes, are a family of two-dimensional (2D) transition metal carbides, nitrides and/ or carbonitrides. [1] The intercalation different cations and organic molecules into MXene for tuning MXenes’ electronic electrochemical properties have been widely reported. [2] [3] [4] However, metals (TMs) which distinct behaviors [5] [6] not explored in the literature intercalation. Therefore, we herein compared effects TM on Ti 3 C 2 T x , offering general insight influences multi-valent, redox-active...
Conventional Li-ion electrolytes consist of carbonate solvents and salts that were made for carbonaceous negative electrodes. When the are used with metallic lithium anodes, lead to low charge-discharge cycle stability due adverse reactive species at anode surface. 1-4 This called solid electrolyte interface (SEI). 1 SEI instabilities/inhomogeneities result in its continuous thickening formation electronically non-active dead lithium. 2 composition structure affected by both solvent...
Synchrotron X-ray absorption spectroscopy (XAS) serves as a robust and powerful technique for probing the oxidation state coordination surrounding of specific elements. In particular, operando XAS has been employed to elucidate charge storage mechanisms by monitoring changes in through edge energy metals electrodes such MnO 2 RuO during charging/discharging [1] [2] . Herein, we utilized in-situ uncover storge transition metal (TM)-intercalated MXenes (Ti 3 C T x ). We specifically probed...
Rechargeable aqueous Zn metal batteries are promising systems for grid storage because of their high energy density, low cost, and non-flammability. However, anodes have major limitations due to dendrite formation concurrent water splitting during charge-discharge cycling. Both processes negatively affect coulombic efficiency (CE) long-term cycling stability. Water-in-salt (WIS) electrolytes were previously proposed address these challenges, yielding improvements in the stability anodes....
Rechargeable aqueous Zn metal batteries are promising systems for grid storage because of their high energy density, low cost, and non-flammability. However, anodes have major limitations due to dendrite formation concurrent water splitting during charge-discharge cycling. Both processes negatively affect coulombic efficiency (CE) long-term cycling stability. Water-in-salt (WIS) electrolytes were previously proposed address these challenges, yielding improvements in the stability anodes....