China University of Petroleum

About: China University of Petroleum is a education organization based out in Beijing, China. It is known for research contribution in the topics: Catalysis & Oil shale. The organization has 39802 authors who have published 39151 publications receiving 483760 citations. The organization is also known as: Zhōngguó Shíyóu Dàxué & China University of Petroleum (Beijing).

Improved Li+ Storage through Homogeneous N-Doping within Highly Branched Tubular Graphitic Foam.

Abstract: A novel carbon structure, highly branched homogeneous-N-doped graphitic (BNG) tubular foam, is designed via a novel N, N-dimethylformamide (DMF)-mediated chemical vapor deposition method. More structural defects are found at the branched portions as compared with the flat tube domains providing abundant active sites and spacious reservoirs for Li+ storage. An individual BNG branch nanobattery is constructed and tested using in situ transmission electron microscopy and the lithiation process is directly visualized in real time.

Effect of Graphite Nanoparticles on Promoting CO2 Hydrate Formation

Abstract: The effects of the graphite nanoparticles on the CO2 hydrate formation process were experimentally studied by measuring the induction time and amount of gas consumed. A suspension of 0.4% graphite nanoparticles was injected into the hydrate formation reactor, while pressure and temperature were maintained at 3.5 MPa and 277.15 K, and the magnetic stirrer speed was set at 300 rpm. The reaction lasted 800 min. The CO2 hydrate formation process and the amount of gas consumed were studied in both pure water and water containing a 0.4% graphite nanoparticle suspension. The induction time of hydrate formation was measured under various pressures. The results show that the nanographite particles had a positive effect on hydrate formation. In comparison to pure water, the induction time of CO2 hydrate formed in the presence of the graphite nanoparticles decreased by 80.8%, while the maximum CO2 consumption increased by 12.8%. In addition, the hydrate reaction was 98.8% complete within 400 min in the presence of n...

Highly fluorescent Ti3C2 MXene quantum dots for macrophage labeling and Cu2+ ion sensing.

Abstract: Quantum dots, derived from two-dimensional (2D) materials, have shown promise in bioimaging, sensing and photothermal applications, and in white light emitting devices (WLEDs). Herein, nitrogen and phosphorus functionalized Ti3C2 MXene based quantum dots (N,P-MQDs) were successfully prepared through a top-bottom hydrothermal method. This type of photoluminescent quantum dots has realized green fluorescence for the first time at around 560 nm with a photoluminescence quantum yield (PLQY) of 20.1%, the highest ever reported; meanwhile, it also exhibits excellent photostability and pH resistance capacities. Comprehensive characterization and well-resolved density functional theory (DFT) calculation were implemented to determine the mechanism of fluorescence shift and enhancement. Furthermore, the N,P-MQDs have been proved to efficiently act as fluorescent probes for macrophage labeling. In addition, the high sensitivity of the N,P-MQDs toward Cu2+ ions made them a low cost, sensitive, environment-friendly, and label-free fluorescence platform for Cu2+ detection. The outstanding performance of Ti3C2 MXene based quantum dots has demonstrated their great potential to be used as promising fluorescent probes in the fields of biological imaging, optical sensing, photoelectric conversion, etc.