Henan Normal University

About: Henan Normal University is a education organization based out in Xinxiang, China. It is known for research contribution in the topics: Catalysis & Ionic liquid. The organization has 10863 authors who have published 11077 publications receiving 166773 citations.

Rhodium(III)-catalyzed annulative coupling between arenes and sulfoxonium ylides via C–H activation

Abstract: The Rh(III)-catalyzed annulative C–H functionalization of arenes with sulfoxonium ylides has been realized. Arenes assisted by diverse nucleophilic directing groups are viable substrates, and the coupling affords structurally diverse fused hetero- and carbocycles under redox-neutral conditions.

Recent advances in electrospun nanofibers for supercapacitors

Abstract: Supercapacitors (SCs) are promising for bridging the power/energy gap between conventional capacitors and batteries/fuel cells However, challenges remain in the improvement of electrode materials toward high capacitive performance Electrospun nanofibers, prepared via facile and low-cost electrospinning techniques, exhibit superior electrochemical performance in SCs due to their unique morphology and intriguing properties, demonstrating great potential for improving the performance of SCs Herein, we review the recent progress in electrospun one-dimensional nanofibers as electrode materials for SCs Three categories of electrospun electrode nanomaterials (ie, carbon nanofibers, carbon nanofiber composites, and carbon-free transition metal oxides) are discussed with design and optimization strategies Moreover, critical insights into the electronic conductivity, electrochemical response and durability of electrospun nanofibers are reviewed Finally, we conclude with an outlook on how these discussions and insights open opportunities for electrospun nanofibers (as electrode materials) to expand their potential application in next-generation SCs

First-principles and experimental study of nitrogen/sulfur co-doped carbon nanosheets as anodes for rechargeable sodium ion batteries

Abstract: Heteroatom doped carbon materials have recently demonstrated an outstanding sodium storage ability and are being considered as the most promising candidate as anodes for sodium ion batteries. However, there is limited understanding of the relationship between structural and electronic properties and electrochemical storage capacity. First-principles calculations on a doped graphene cluster propose that N, S co-doping can promote the electronegativity, adsorption capacity of Na atoms and diffusion of Na+ ions on graphene sheets, especially for the sample consisting of more pyridinic-N, while excessive O atoms may alleviate these. All these features render N, S co-doped carbon as a superior anode for sodium ion batteries. Therefore, the N, S co-doped carbon nanosheets are fabricated via a simple thermal treatment method using gelatin as the carbon source and thiourea as the N and S precursor. The optimized product (mgelatin : mthiourea = 1 : 10) results in a superb cycling capacity of 300 mA h g−1 after 500 cycles, with a coulombic efficiency of ∼100%. This study provides a facile and reliable route to prepare co-doped carbon with enhanced sodium storage properties.

Perovskite Quantum Dot Solar Cells with 15.6% Efficiency and Improved Stability Enabled by an α-CsPbI3/FAPbI3 Bilayer Structure

Abstract: We developed lead halide perovskite quantum dot (QD) solar cells with a combinational absorbing layer based on stacked α-CsPbI3 and FAPbI3. α-CsPbI3 QDs, with a relatively wide bandgap of 1.75 eV, ...