Southwest University of Science and Technology

About: Southwest University of Science and Technology is a education organization based out in Mianyang, China. It is known for research contribution in the topics: Adsorption & Graphene. The organization has 10017 authors who have published 8923 publications receiving 94850 citations. The organization is also known as: Xīnán Kējìdàxué.

Polyethylene glycol supported by phosphorylated polyvinyl alcohol/graphene aerogel as a high thermal stability phase change material

Abstract: Polyethylene glycol (PEG) as a phase change material (PCM) is limited in practical applications due to the three major drawbacks of low thermal conductivity, poor thermal stability, and easy leakage. In this study, a new shape-stabilized PPVA/GA/PEG PCM based on Phosphorylated polyvinyl alcohol (PPVA) and graphene aerogels (GA) as a “double-network” support material was obtained using a one-step method, and the three major obstacles of PEG as a PCM were well resolved in this composite material. 15%-PPVA/GA/PEG composite PCMs still exhibit high energy storage capacity while having high thermal stability and high shape-stabilized property. 15%-PPVA/GA/PEG composite PCMs (0.610 W m−1 K−1), with only 1.60 wt% GA, showed an enhanced thermal conductivity than that of PEG (0.493 W m−1 K−1), and it still exhibited an acceptable latent heat of fusion of 119.6 J g−1. Furthermore, the peak heat release rate of 15%-PPVA/GA/PEG composite PCMs decreased by 19.2% compared with PEG. The above experimental results indicate that the prepared PPVA/GA/PEG composite PCMs have application prospects in thermal energy storage field.

Hetero-N-Coordinated Co Single Sites with High Turnover Frequency for Efficient Electrocatalytic Oxygen Evolution in an Acidic Medium

Abstract: The development of noble-metal-free, acid-compatible oxygen electrocatalysts and monitoring their active sites’ evolution under working conditions are crucial for global renewable energy storage an...

The contribution of doped-Al to the colossal permittivity properties of AlxNb0.03Ti0.97−xO2 rutile ceramics

Abstract: The search for colossal permittivity (CP) materials continues to attract considerable interest motivated by not only academic research but also potential applications. Very recently, CP with low dielectric loss was reported in In + Nb co-doped rutile TiO2 polycrystalline ceramics. However, the mechanism of CP in this material system and the effect of doping ions are still unclear. Here, we investigated the dielectric properties of AlxNb0.03Ti0.97−xO2 (x = 0, 0.01, 0.03 and 0.05) ceramics. CP with low dielectric loss was found in AlxNb0.03Ti0.97−xO2 samples (x ≤ 0.03). Once the amount of Al-doping exceeds Nb, the CP disappears. The change in dielectric response with varying Al-doping concentration and Ti3+ concentration together with the conductive activation energy in AlxNb0.03Ti0.97−xO2 ceramics clearly suggest that the CP mechanism in co-doped TiO2 ceramics could be attributed to the internal barrier layer capacitor effect. We believe that our research provides comprehensive guidance for the development of CP materials.