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Enhanced Sodium Storage and Thermal Safety of NaNiFeMnO Cathode via Incorporation of TiN and WO.
ACS Appl Mater Interfaces
January 2025
College of Physics and Energy, Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center, Fujian Normal University, Fuzhou 350117, China.
This study proposes an efficient, cost-effective, and industrially scalable electrode modulation strategy, which involves directly adding a small amount of high thermal and high conductance TiN and well interface compatible WO to NaNiFeMnO (NaNFMO-TW) cathode slurry, to effectively reduce electrode polarization and interface side reactions, reduce the Ohmic heat and polarization heat of the battery, and ultimately to significantly improve the sodium-ion storage and thermal safety performance of the battery. At room temperature (RT) and 1C rate, the modified NaNFMO-TW electrode exhibits a reversible capacity of ∼95 mAh g after 300 cycles, with a capacity retention rate of 82.6%, being higher than the 50.
View Article and Find Full Text PDFReducing Nonradiative Recombination in Halide Perovskites through Appropriate Band Gaps and Heavy Atomic Masses.
J Phys Chem Lett
January 2025
State Key Laboratory of Organic Electronics and Information Displays, Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
Halide perovskite optoelectronic devices achieve high energy conversion efficiencies. However, their efficiency decreases significantly with an increase in temperature. This decline is likely caused by changes in nonradiative recombination and electron-phonon coupling, which remain underexplored.
View Article and Find Full Text PDFOn the geometric phase effects on time evolution of the density matrix during modulated radiofrequency pulses.
J Magn Reson
January 2025
Center for Magnetic Resonance Research, University of Minnesota, 2021 6th Street SE, Minneapolis, MN 55455, USA. Electronic address:
In this work the effect of the geometric phase on time evolution of the density matrix was evaluated during nonadiabatic radiofrequency (RF) pulses with Sine amplitude modulation (AM) and Cosine frequency modulation (FM) functions of the RAFF (Relaxations Along a Fictitious Field) family, and the polarization between two energy level ½ spin system coupled by dipolar interaction was evaluated during the application of RF irradiation. The dependencies of the diagonal density matrix elements and the polarization on the rotational correlation times and the time during RF pulses were evaluated. The general treatment of the density matrix elements along with the polarization generated during RF pulses was unavailable thus far, and for the first time was here derived for the nonadiabatic case of the RAFF pulses.
View Article and Find Full Text PDFDirect Frequency Comb Cavity Ring-Down Spectroscopy Using Vernier Filtering.
J Phys Chem A
January 2025
Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States.
We present direct frequency comb cavity ring-down spectroscopy with Vernier filtering as a straightforward approach to sensitive and multiplexed trace gas detection. The high finesse cavity acts both to extend the interaction length with the sample and as a spectral filter, alleviating the need for dispersive elements or an interferometer. In this demonstration, a free running interband cascade laser was used to generate a comb centered at 3.
View Article and Find Full Text PDFSize Effect on Ultrafast Dynamics of the Photoexcited Be Electron in Be@C (2 = 60, 70, and 80).
J Phys Chem Lett
January 2025
MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an 710049, China.
The ultrafast excited-state dynamics of endohedral fullerenes are crucial in their photophysical and photochemical processes when they are employed as photovoltaic devices, photocatalytic devices, and single-molecule devices. In this study, by employing the non-adiabatic molecular dynamics simulations based on the time-dependent Kohn-Sham (TD-KS) method, we theoretically studied the size effect on ultrafast excited-state decay dynamics of the photoexcited Be electron in endohedral fullerenes Be@C (2 = 60, 70, and 80). These excited-state decay dynamics, which involve the charge-transfer process, occur in an ultrafast time scale of about 3 ps.
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