Renmin University of China

About: Renmin University of China is a education organization based out in Beijing, Beijing, China. It is known for research contribution in the topics: China & Population. The organization has 11325 authors who have published 15498 publications receiving 238419 citations. The organization is also known as: Renmin University & People's University of China.

Primary Dynamics of Exciton and Charge Photogeneration in Solvent Vapor Annealed P3HT/PCBM Films

Abstract: The primary dynamics of exciton and charge photogeneration in the neat P3HT (poly(3-hexylthiophene)) and the blend P3HT/PCBM ([6,6]-phenyl-C61-butyric acid methyl ester) films were investigated by the use of near-infrared femtosecond transient absorption spectroscopy with varying excitation photon energy and fluence. The effects of film morphology were examined by comparing the solvent vapor annealed (SVA) and the carbon disulfide (CS2) cast films. Spectroelectrochemistry was employed to characterize the cationic polaron P3HT•+ to facilitate the assignments of the transient spectra. Time-resolved spectroscopy revealed two different types of polarons, the delocalized (DP, absorbing over 630–830 nm) and the localized (LP, 750–1100 nm) ones inhabiting the crystalline and the disordered P3HT phases, respectively. In addition, the characteristic absorption of the long-sought anionic polaron P3HT•– is proposed to be a broad-band spectrum extending up to ∼1300 nm with a maximum at ∼1080 nm. For SVA neat P3HT fil...

M8MgSc(PO4)7:xDy3+ (M = Ca/Sr) Single-Phase Full-Color Phosphor with High Thermal Emission Stability

Abstract: Two series of phosphors of Ca8MgSc(PO4)7:Dy3+ and Sr8MgSc(PO4)7:Dy3+ single-phase white-emitting phosphors with high thermal emission stability are synthesized by the high-temperature solid-state reaction. The crystal structure, photoluminescence (PL), PL excitation (PLE), and thermal PL quenching spectra of Ca8MgSc(PO4)7:xDy3+ and Sr8MgSc(PO4)7:xDy3+ were investigated and compared in detail. Upon excitation at 387 nm, M8MgSc(PO4)7:xDy3+ (M = Ca/Sr) showed white emission centered at 480, 571, 660, and 754 nm. The white-emitting Dy-phosphor Ca8MgSc(PO4)7:Dy3+ (CMSP:Dy) had good terminal stability. The emission intensity of Ca8MgSc(PO4)7:Dy3+ still remained 95.2% of that at room temperature at 160 °C, and remained 77.3% at 300 °C under 387 nm excitation.

Fe-Catalyzed Cross-Dehydrogenative Coupling Reactions

Abstract: Cross-dehydrogenative coupling (CDC), which enables the formation of carbon–carbon (C–C) and C–heteroatom bonds from the direct coupling of two C–H bonds or C–H/X–H bonds, represents a new state of the art in the field of organic chemistry. Iron, a prominent metal, has already shown its versatile application in chemical synthesis. This review attempts to provide a comprehensive understanding of the evolution of cross-dehydrogenative coupling via iron catalysis, as well as its application in synthetic chemistry.

Fe nanodot-decorated MoS2 nanosheets on carbon cloth: an efficient and flexible electrode for ambient ammonia synthesis

Abstract: Electrochemical reduction of nitrogen to ammonia provides an alternative to the energy- and capital-intensive Haber–Bosch process. However, limited progress has been made to date, as most catalysts lack efficient activity for nitrogen fixation. Here, we report Fe nanodot-decorated MoS2 nanosheets on carbon cloth as an efficient and flexible electrode for the electrochemical nitrogen reduction reaction (NRR) under ambient conditions. The strong electronic interaction between Fe and MoS2 plays a key role in boosting the NRR. Remarkably, the as-obtained Fe–MoS2/CC electrode shows outstanding electrochemical NRR performance with an average NH3 yield of 12.5 µg h−1 cm−2 and a faradaic efficiency of 10.8% at −0.1 V versus the reversible hydrogen electrode. Theoretical and experimental evidence verifies that the high NRR activity originates from the synergistic effect between the Fe nanodots and MoS2 nanosheets. Additionally, the electrode also possesses flexibility and long-term stability, providing a potential approach for integration into practical devices.