AI Article Synopsis
- The phase transition of layered manganese oxides to spinel phases causes capacity fading in rechargeable batteries, a process tied to the inherent properties of manganese.
- Introducing crystal water through an electrochemical process can trigger the reverse phase transition back to a layered structure called Birnessite.
- Scanning transmission electron microscopy allows for the visualization of lattice rearrangements and the insertion of crystal water, showing how this method can reverse the phase transition effectively.
Article Abstract
The phase transition of layered manganese oxides to spinel phases is a well-known phenomenon in rechargeable batteries and is the main origin of the capacity fading in these materials. This spontaneous phase transition is associated with the intrinsic properties of manganese, such as its size, preferred crystal positions, and reaction characteristics, and it is therefore very difficult to avoid. The introduction of crystal water by an electrochemical process enables the inverse phase transition from spinel to a layered Birnessite structure. Scanning transmission electron microscopy can be used to directly visualize the rearrangement of lattice atoms, the simultaneous insertion of crystal water, the formation of a transient structure at the phase boundary, and layer-by-layer progression of the phase transition from the edge. This research indicates that crystal water intercalation can reverse phase transformation with thermodynamically favored directionality.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/anie.201505487 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Perovskite CsCuClxBr3- x Microcrystals: Band Structure, Photochemical Stability, and Photocatalytic Properties.
ChemSusChem
December 2024
North China Electric Power University, College of Environmental Science and Engineering, CHINA.
Although Pb-based metal halide perovskites (MHPs) have excellent photoelectric characteristics, their toxicity remains a limiting factor for their widespread application. In the paper, a series of CsCuClxBr3-x (x = 1, 2, 3) MHP microcrystals were developed and their hydrogen evolution performance in ethanol and HX (X = Cl, Br) was also studied. Among them, CsCuCl3 microcrystals exhibit high hydrogen evolution performance in both HX and ethanol, attributed to their longest average lifetime and suitable band structure.
View Article and Find Full Text PDFPerformance and Stability of Corundum-type In2O3 Catalyst for Carbon Dioxide Hydrogenation to Methanol.
Angew Chem Int Ed Engl
December 2024
TU Berlin University: Technische Universitat Berlin, Fachbereich Keramische Werkstoffe, Hardenbergstr. 40, 10623, Berlin, GERMANY.
Carbon dioxide hydrogenation to methanol is a key chemical reaction to store energy in chemical bonds, using carbon dioxide as an energy sink. Indium oxide is amongst the most promising candidates for replacing the copper and zinc oxide catalyst, which is industrially applied for syngas mixtures but less idoneous for educts with carbon dioxide due to instability reasons. The polymorph of indium oxide and the operating conditions remain to be optimized for optimal and stable performance.
View Article and Find Full Text PDFDirect Observation of a Photoinduced Topological Phase Transition in Bi-Doped (Pb,Sn)Se.
Phys Rev Lett
December 2024
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
Ultrafast photoexcitation offers a novel approach to manipulating quantum materials. One of the long-standing goals in this field is to achieve optical control over topological properties. However, the impact on their electronic structures, which host gapless surface states, has yet to be directly observed.
View Article and Find Full Text PDFPhase Transition and Multistability in Dicke Dimer.
Phys Rev Lett
December 2024
Department of Physics and Astronomy, and Smalley-Curl Institute, Rice University, Houston, Texas 77251-1892, USA.
The hybrid quantum system of cold atomic gas and optical cavity can host many exotic phenomena including phase transitions and multistabilities. In this Letter, we investigate the effect of photon hopping between two Dicke cavities and show rich quantum phases for steady states and dynamic processes. Starting from a generic dimer system where the two cavities are not necessarily identical, we analytically obtain all possible steady-state phases and confirm their existence by numerical calculations.
View Article and Find Full Text PDFOptimized Trajectory Unraveling for Classical Simulation of Noisy Quantum Dynamics.
Phys Rev Lett
December 2024
Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
The dynamics of open quantum systems can be simulated by unraveling it into an ensemble of pure state trajectories undergoing nonunitary monitored evolution, which has recently been shown to undergo measurement-induced entanglement phase transition. Here, we show that, for an arbitrary decoherence channel, one can optimize the unraveling scheme to lower the threshold for entanglement phase transition, thereby enabling efficient classical simulation of the open dynamics for a broader range of decoherence rates. Taking noisy random unitary circuits as a paradigmatic example, we analytically derive the optimum unraveling basis that on average minimizes the threshold.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!