Nanjing University of Science and Technology

About: Nanjing University of Science and Technology is a education organization based out in Nanjing, China. It is known for research contribution in the topics: Control theory & Catalysis. The organization has 31581 authors who have published 36390 publications receiving 525474 citations. The organization is also known as: Nánjīng Lǐgōng Dàxué & Nánlǐgōng.

Synthesis of N-Doped Hollow-Structured Mesoporous Carbon Nanospheres for High-Performance Supercapacitors

Abstract: We have demonstrated a facile and controllable synthesis of monodispersed N-doped hollow mesoporous carbon nanospheres (N-HMCSs) and yolk-shell hollow mesoporous carbon nanospheres (N-YSHMCSs) by a modified "silica-assisted" route. The synthesis process can be carried out by using resorcinol-formaldehyde resin as a carbon precursor, melamine as a nitrogen source, hexadecyl trimethylammonium chloride as a template, and silicate oligomers as structure-supporter. The morphological (i.e., particle size, shell thickness, cavity size, and core diameter) and textural features of the carbon nanospheres are easily controlled by varying the amount of ammonium. The resultant carbon nanospheres possess high surface areas (up to 2464 m(2) g(-1)), large pore volumes (up to 2.36 cm(3) g(-1)), and uniform mesopore size (∼2.4 nm for N-HMCSs, ∼ 4.5 nm for N-YSHMCSs). Through combining the hollow mesoporous structure, high porosity, large surface area, and N heteroatomic functionality, the as-synthesized N-doped hollow-structured carbon nanospheres manifest excellent supercapacitor performance with high capacitance (up to 240 F/g), favorable capacitance retention (97.0% capacitive retention after 5000 cycles), and high energy density (up to 11.1 Wh kg(-1)).

Self-Healing, Adhesive, and Highly Stretchable Ionogel as a Strain Sensor for Extremely Large Deformation

Abstract: Fabricating a strain sensor that can detect large deformation over a curved object with a high sensitivity is crucial in wearable electronics, human/machine interfaces, and soft robotics. Herein, an ionogel nanocomposite is presented for this purpose. Tuning the composition of the ionogel nanocomposites allows the attainment of the best features, such as excellent self-healing (>95% healing efficiency), strong adhesion (347.3 N m-1 ), high stretchability (2000%), and more than ten times change in resistance under stretching. Furthermore, the ionogel nanocomposite-based sensor exhibits good reliability and excellent durability after 500 cycles, as well as a large gauge factor of 20 when it is stretched under a strain of 800-1400%. Moreover, the nanocomposite can self-heal under arduous conditions, such as a temperature as low as -20 °C and a temperature as high as 60 °C. All these merits are achieved mainly due to the integration of dynamic metal coordination bonds inside a loosely cross-linked network of ionogel nanocomposite doped with Fe3 O4 nanoparticles.

MnOx supported on Fe–Ti spinel: A novel Mn based low temperature SCR catalyst with a high N2 selectivity

Abstract: In this work, a novel 10% Mn/Fe–Ti spinel catalyst with an excellent N2 selectivity was developed for the selective catalytic reduction (SCR) of NO with NH3 at low temperatures. The mechanism of NO reduction and N2O formation over Fe–Ti spinel, 10% Mn/Fe–Ti spinel and 5% Mn–10% Fe/TiO2 was investigated using in situ DRIFT study and the transient reaction study. Meanwhile, the reaction kinetic constant of the SCR reaction (i.e., N2 formation) through the Eley–Rideal mechanism, the reaction kinetic constant of the SCR reaction through the Langmuir–Hinshelwood mechanism and the reaction kinetic constant of the non selective catalytic reduction (NSCR) reaction (i.e., N2O formation) were obtained according to the steady state kinetic study. They all indicate that the NSCR reaction over 10% Mn/Fe–Ti spinel through the Eley–Rideal mechanism was cut off. NH2 adsorbed on 10% Mn/Fe–Ti spinel can be hardly oxidized to NH as NH2 mainly adsorbed on the support (i.e., Fe–Ti spinel) of 10% Mn/Fe–Ti spinel, which was far away from Mn4+ cations on 10% Mn/Fe–Ti spinel. Therefore, the NSCR reaction over 10% Mn/Fe–Ti spinel through the Eley–Rideal mechanism was suppressed. However, the regeneration of Fe3+ on Fe–Ti spinel was accelerated due to the rapid electron transfer between Mn4+ and Fe2+ on 10% Mn/Fe–Ti spinel resulting in a remarkable promotion on NH3 activation although NH3 adsorbed on 10% Mn/Fe–Ti spinel cannot be directly activated by Mn4+ on 10% Mn/Fe–Ti spinel. Therefore, the SCR reaction over Fe–Ti spinel was promoted remarkably after the load of MnOx. As a result, 10% Mn/Fe–Ti spinel showed an excellent SCR performance especially N2 selectivity at low temperatures, which was much better than 5% Mn-10% Fe/TiO2 with the same chemical composition.