Hydrogen oxygen fuel cell will be the most widely used and commercialized fuel cell in the future. For further study of hydrogen oxygen fuel cell, a simulation model of hydrogen oxygen fuel cell is built up in this paper according to the theory of dynamic model and static model. It is verified that the static and dynamic characteristics of the simulation model are in good coincidence with the hydrogen oxygen fuel cell, which enhance the accuracy and reliability of the simulation model.
Converting CO2 into chemical fuels with a photocatalyst and sunlight is an appealing approach to address climate deterioration and energy crisis. Metal complexes are superb candidates for CO2 reduction due to their tunable catalytic sites with high activity. The coupling of metal complexes with organic photosensitizers is regarded as a common strategy for establishing photocatalytic systems for visible-light-driven CO2 reduction. While most of the organic photosensitizers generally contain precious metals and are available through onerous synthetic routes, their large-scale application in the photocatalysis is limited. Halide perovskite nanocrystals (NCs) have been considered as one of the most promising light-harvesting materials to replace the organic photosensitizers due to their tunable light absorption range, low cost, abundant surface sites, and high molar extinction coefficient. Herein, we demonstrate a facile strategy to immobilize [Ni(terpy)2]2+ (Ni(tpy)) on inorganic ligand-capped CsPbBr3 NCs and to apply this hybrid as a catalyst for visible-light-driven CO2 reduction. In this hybrid photocatalytic system, the Ni(tpy) can provide specific catalytic sites and serve as electron sinks to suppress electron–hole recombination in the CsPbBr3 NCs. The CsPbBr3-Ni(tpy) catalytic system achieves a high yield (1724 μmol/g) in the reduction of CO2 to CO/CH4, which is approximately 26-fold higher than that achieved with the pristine CsPbBr3 NCs. This work has developed a method for enhancing the performance of photocatalytic CO2 reduction by immobilizing metal complexes on perovskite NCs. The methodology we present here provides a new platform for utilizing halide perovskite NCs for photocatalytic applications.
In this work, the β crystalline morphology of polypropylene membranes and dual nucleating ability of compound nucleating agent (NA) are systematically invested. A kind of aryl amide-based compound TMB-5 and another kind of commercial rare earth-based β-NA WBG-II were chosen. It is intriguing that the supramolecular self-assembly aggregations of WBG-II changed from flower-like to needle-like frameworks with a lower supercooling temperature for recrystallization after the introduction of TMB-5. Considering that it is more difficult for TMB-5 to dissolve in polypropylene melt, the remaining undissolved TMB-5 aggregations serve as the heterogeneous nucleation sites, which can accelerate the recrystallization of WBG-II. Such a process prevents the WBG-II microfibers self-assembled into big flower-like frameworks. The needle-like aggregations of the compound NA are smaller and more uniform in size, which is helpful in obtaining cast films with more uniform crystal morphology. Thus, microporous membranes with high porosity could be obtained after biaxial stretching of oriented cast films. This work leads to a new understanding of the relationship between "NA framework size uniformity"- "crystallization uniformity"- "micropore uniformity," which is helpful to find an appropriate crystalline morphology for high-performance microporous membranes of PP by biaxial stretching.
Abstract Hyperbolic materials (HMs) have garnered significant attention for their distinct electromagnetic response characteristics. Recent advancements in developing meta hyperbolic surfaces through intricate substrate patterning have enabled the realization of highly-directional hyperbolic surface plasmons, which play a crucial role in optoelectronic devices. In this study, we expand the possibility of natural two-dimensional (2D) materials in achieving exceptional electromagnetic scenarios akin to those observed in meta hyperbolic surfaces. Notably, natural hyperbolic 2D materials provide inherent advantages in terms of simplicity, predictability, and lower losses compared to meta-surfaces. By employing first-principles calculations, we unveil the possibility of achieving this mechanism in a realistic 2D material, specifically the RuOCl 2 monolayer. Our results demonstrate that the RuOCl 2 monolayer sustains carrier-density-independent and broadband low-loss hyperbolic responses across the terahertz to ultraviolet spectral range, owning to the highly-anisotropic electronic band structures characterized by quasi-one-dimensional electron gas (Q1DEG). These findings shed light on the integration of hyperbolicity in natural 2D materials, opening new avenues for the design and development of novel optoelectronic devices and nanoscale imaging systems.
'/%3e%3cuse xlink:href='%23a' transform='rotate(23.036 .093 25.536)'/%3e%3cuse xlink:href='%23a' transform='rotate(45.87 1.273 16.18)'/%3e%3cuse xlink:href='%23a' transform='rotate(69.945 .996 12.078)'/%3e%3cuse xlink:href='%23a' transform='rotate(20.66 -19.689 31.932)'/%3e%3c/svg%3e)