Rational tailoring of the local coordination environment of single atoms has demonstrated a significant impact on the electronic state and catalytic performance, but the development of catalysts beyond noble/transition metals is profoundly significant and highly desired. Herein, the main-group metal indium (In) single atom is immobilized on sulfur-doped porous carbon nitride nanosheets (In@CNS) in the form of three nitrogen atoms coordinated with one sulfur atom (In-N-S). Both theoretical calculations and advanced characterization investigations clearly elucidated that the single-atomic In-N-S structures on In@CNS are powerful in promoting the dissociation of excitons into more free carriers as well as the charge separation, synergistically elevating electron concentration by 2.
View Article and Find Full Text PDFJ Phys Chem Lett
November 2023
Quantum computation represents a revolutionary approach to solving problems in quantum chemistry. However, due to the limited quantum resources in the current noisy intermediate-scale quantum (NISQ) devices, quantum algorithms for large chemical systems remain a major task. In this work, we demonstrate that the circuit depth of the unitary coupled cluster (UCC) and UCC-based ansatzes in the algorithm of the variational quantum eigensolver can be significantly reduced by an energy-sorting strategy.
View Article and Find Full Text PDFFabrication of a highly porous sulfur host and using excess electrolyte is a common strategy to enhance sulfur utilization. However, flooded electrolyte limits the practical energy density of Li-S pouch cells. In this study, a novel Fe Co Ni S (FCN) is proposed as host for sulfur to realize Ah-level Li-S full cells demonstrating excellent electrochemical performances under 2 µL mg lean electrolyte conditions.
View Article and Find Full Text PDFTuning the resonance frequency of an optical whispering gallery mode microcavity is extremely important in its various applications. Here we report the design and implementation of a function resonance tuner of an optical microcavity with a resolution of about 650 kHz (7 pm at 1450 nm band). A piezoelectric nano-positioner is used to mechanically compress the microsphere in its axial direction.
View Article and Find Full Text PDFJ Nanosci Nanotechnol
September 2019
In this paper, magnetic NiFe₂O₄-RHC (rice husk carbon) catalysts with different NiFe₂O₄ contents are prepared through a one-step hydrothermal method and employed as a catalyst for the reduction of nitrophenols. The resulting catalysts are characterized using various techniques. It is indicated that the NiFe₂O₄ nanoparticles are well dispersed on the RHC with the average size of 9.
View Article and Find Full Text PDFWe have studied the effect of geometry deformation on the mechanical frequencies and quality factors for different modes in the Whispering Gallery Mode (WGM) microresonators, that is unavoidable in the practical fabrication. The subsidence of the sphere and a more general condition with fewer symmetries and complex deformation of eccentricity, subsidence, and offset are first modeled in this paper, which could tune the mechanical frequency in a much wider spectral range than the pillar-diameter-induced perturbation. we also show that the mechanical quality factors for the non-whispering-gallery mechanical mode could be increased in the order of 4 magnitudes at a specific subsidence, and form a mechanical bound state in the continuum (BIC) which is induced by the symmetry breaking and reveals new mechanisms to confine radiation.
View Article and Find Full Text PDFIn this study, 20 new derivatives of caffeic acid esters were synthesized and their inhibitory activities against the lipopolysaccharide (LPS)-induced nitric oxide (NO) production in RAW264.7 macrophages were determined. Compounds 3l, 3r, 3s and 3t were found to decrease nitrite levels in a dose-dependent manner in LPS-induced cells and showed potent inhibitory activities against the NO production in RAW264.
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