Jilin University

About: Jilin University is a education organization based out in Changchun, China. It is known for research contribution in the topics: Catalysis & Apoptosis. The organization has 101453 authors who have published 88966 publications receiving 1444456 citations. The organization is also known as: Jílín Dàxué.

Solution processable D–A small molecules for bulk-heterojunction solar cells

Abstract: Solution processable small molecules have been widely applied for photovoltaic (PV) devices in recent years because they show strong absorption properties, and they can be easily purified and deposited onto flexible substrates at low cost. Introducing different donor and acceptor groups to construct donor–acceptor (D–A) structure small molecules has proved to be an efficient way to improve the properties of organic solar cells (OSCs). This review deals with the recent progress of solution processable D–A structure small molecules and discusses the key factors affecting the properties of OSCs based on D–A structure small molecules: sunlight absorption, charge transport and the energy level of the molecules. Then we give some suggestions for designing new solution processable D–A structure small molecules for high performance OSCs.

Hydrogen Selective NH2‐MIL‐53(Al) MOF Membranes with High Permeability

Abstract: Hydrogen-based energy is a promising renewable and clean resource. Thus, hydrogen selective microporous membranes with high performance and high stability are demanded. Novel NH2-MIL-53(Al) membranes are evaluated for hydrogen separation for this goal. Continuous NH2-MIL-53(Al) membranes have been prepared successfully on macroporous glass frit discs assisted with colloidal seeds. The gas sorption ability of NH2-MIL-53(Al) materials is studied by gas adsorption measurement. The isosteric heats of adsorption in a sequence of CO2 > N2 > CH4 ≈ H2 indicates different interactions between NH2-MIL-53(Al) framework and these gases. As-prepared membranes are measured by single and binary gas permeation at different temperatures. The results of singe gas permeation show a decreasing permeance in an order of H2 > CH4 > N2 > CO2, suggesting that the diffusion and adsorption properties make significant contributions in the gas permeation through the membrane. In binary gas permeation, the NH2-MIL-53(Al) membrane shows high selectivity for H2 with separation factors of 20.7, 23.9 and 30.9 at room temperature (288 K) for H2 over CH4, N2 and CO2, respectively. In comparison to single gas permeation, a slightly higher separation factor is obtained due to the competitive adsorption effect between the gases in the porous MOF membrane. Additionally, the NH2-MIL-53(Al) membrane exhibits very high permeance for H2 in the mixtures separation (above 1.5 × 10−6 mol m−2 s−1 Pa−1) due to its large cavity, resulting in a very high separation power. The details of the temperature effect on the permeances of H2 over other gases are investigated from 288 to 353 K. The supported NH2-MIL-53(Al) membranes with high hydrogen separation power possess high stability, resistance to cracking, temperature cycling and show high reproducibility, necessary for the potential application to hydrogen recycling.

Modelling of surface energies of elemental crystals

Abstract: A simple formula without any free parameter is established to estimate surface energies of elemental metals of low-index surfaces, which is developed by modifying the classic broken-bond rule. The predicted results of the formula for 52 A1–A4 and sc elemental crystals are in agreement with experimental results and the first-principles calculations although deviations are present for several divalent sp metals.