Aerogel is a solid material with the smallest density and lightest weight in the world at present. Its unique three?dimensional network structure makes it widely used. Cellulose aerogels not only have the characteristics of high porosity and high specific surface area of aerogels, but also can be degraded by microorganisms and be compatible with other substances, which is a new energy suitable for sustainable development. The preparation process of cellulose aerogel—sol gel process and hydrogel drying process are described. In addition, the applications of cellulose aerogel in oil?water separation, heat insulation, phase change, supercapacitor, biomedicine and other aspects are also introduced, and its development is prospected.

MoS₂ quantum dots (QDs) have attracted a lot of attention lately due to their excellent fluorescence properties, catalytic activity, and good biocompatibility. There are various ways to prepare MoS₂ QDs since its first preparation in 2010, including hydrothermal, ultrasonic, and etching methods. Even though other molybdenum?based quantum dots like MoP, Mo₂C, Mo₂N, and MoSe₂ have shown great potential in various fields, their preparation methods have rarely been reported. In this article, The preparation methods and research status of these molybdenum?based quantum dots (MoO₂/MoO₃, MoP, Mo₂C, Mo₂N amd MoSe₂) and comparing the advantages and limitations of different preparation methods were discussed. The key problems in the synthesis of these quantum dots and their application prospects in different directions were discussed.

The precursor was prepared by sol?gel method using ammonium molydate tetrahydrate [(NH₄)₆Mo₇O₂₄·4H₂O] as molybdenum source,nickle nitrate hexahydrate [Ni(NO₃)₂·6H₂O] as nickel source and H₃PO₄ as phosphorus source.NiMoP/C composites were then prepared by a following CVD (chemical vapor deposition) method.The physical and chemical properties of NiMoP/C composites were characterized by XRD,SEM,TEM,XPS,Raman,N₂?adsorption desorption and other test techniques. Meanwhile,the electrocatalytic hydrogen evolution performance of the NiMoP/C composite material was measured by CV,LSV, EIS,etc.The results show that the NiMoP/C composite material has high electrocatalytic hydrogen evolution performance with overpotential of -158 mV at the current density of -10 mA/cm² and Tafel slope of 111 mV/dec. So the NiMoP/C material is an excellent anode material suitable for electrolyzing water in acidic media due to its simply electrode preparation process preparation method.

In recent years, horizontal well fracturing water injection huff and puff technology has become the main development technology of tight oil.In the initial stage of water injection huff and puff, higher production was achieved,however,with the increase of huff and puff times,the production decreased rapidly and the oil⁃water replacement efficiency was low.Based on the compact oil data of Jimusaer Oilfield in Xinjiang,through laboratory core water injection huff and puff experiment and single well water injection huff and puff numerical simulation research,the effects of injection volume,time of water injection huff and puff,injection speed, huff and puff times,soaking time and production speed on water injection huff and puff recovery are analyzed.The single well geological model is established,and the influencing factors of water injection huff and puff are fitted by multi⁃nonlinear function.The empirical formulas of five parameters and three parameters of water injection huff and puff are deduced for the first time. The prediction error is within 8%, which provides important reference for the development of water injection huff and puff in the study area and similar tight reservoirs.

X80 pipeline steel specimens were treated by electrochemical hydrogen charging under various current densities and charging time. The polarization resistance and corrosion rate of X80 steel were analyzed in Yingtan simulated soil solution under the different hydrogen charging conditions. The results show that with the hydrogen charging current density increased from 1 mA/cm ² to 20 mA/cm ², the free-corrosion potential of X80 moved negatively, charge transfer resistance Rt dropped from 1 176 Ω·cm ² to 909 Ω ·cm ², double electric layer capacitors increased from 0.000 16 μF/cm ² to 0.001 7μF/cm ² and corrosion current density increased from 3.322 mA/cm ² to 6.880 mA/cm ². When filling hydrogen time increased from 1 h to 5 h, Rt changed from 1 522 Ω ·cm ² down to 749 Ω ·cm ², double electric layer capacitors increased from 0.000 14 μF/cm ² to 0.007 5 μF/cm2 and corrosion current density increased from 2.91 mA/cm ² to 5.01 mA/cm ². This suggests that electrochemical hydrogen charging result in anodic dissolution rate of the weak spots and concentration of metal ions increased. Hydrogen speeded up anodic dissolution of X80 steel and leaded to higher corrosion sensitivity at the steel surface.