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.

Solvothermal synthesis of Cu/Cu2O hollow microspheres for non-enzymatic amperometric glucose sensing

Abstract: In this study, Cu/Cu2O hollow microspheres (HMs) were fabricated by over-reduction of copper(II) with ethylene glycol under solvothermal conditions. The resultant products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The results reveal that the reaction time and temperature play important roles in this system. The growth mechanism of the Cu/Cu2O HMs is discussed in some detail. The as-prepared Cu/Cu2O HMs show a higher catalytic activity than that of Cu2O microspheres and microcubes towards glucose oxidation, which are potential candidates for fundamental studies as well as catalysis, energy storage and conversion, and biomedicine.

A new method for the synthesis of LiNi1/3Co1/3Mn1/3O2 from waste lithium ion batteries

Abstract: A new process for the synthesis of LiNi1/3Co1/3Mn1/3O2 from recycled valuable metals of waste lithium ion batteries (LIBs) is introduced herein. Citric acid was used as both a leaching and chelating agent. The overall process involves three steps: dissolution of spent lithium ion batteries, sol–gel formation and LiNi1/3Co1/3Mn1/3O2 powder formation. The concentrations of the metal ions, specifically lithium, nickel, manganese, and cobalt in the leachate were determined by inductively coupled plasma optical emission spectroscopy (ICP-OES). The morphologies of the cathode material from waste LIBs before and after leaching, as well as those of the leaching residue and the final products, were observed by scanning electron microscopy (SEM). The structure of the final product was characterized by X-ray diffraction (XRD) analysis. With regards to electrochemical properties, the re-synthesized and fresh-synthesized samples delivered capacities of 147 and 150 mA h g−1, respectively, in the first cycle. The rate performances, high and low temperature discharge performances, and the electrochemical impedance spectra (EIS) are also discussed. This study suggests that the waste lithium ion batteries can be recycled to re-synthesize new cathode materials with good electrochemical performance.

Recent advances in electrospun one-dimensional carbon nanofiber structures/heterostructures as anode materials for sodium ion batteries

Abstract: As promising candidates for large-scale energy storage systems, sodium ion batteries (SIBs) are limited by their relatively lower energy density. This shortcoming necessitates the design of anodes with high specific capacity and excellent cycling durability, yet low cost. Here, we review one-dimensional structural/heterostructural carbon nanofibers (CNFs), which are generally synthesized via a simple, low cost, and scalable electrospinning technology, as a basis for developing anode materials for SIBs. The rational design in the structure and chemistry of CNFs, including construction of cross-link structures and porous structures as well as heteroatom doping, is described, followed by illustrations of how a robust understanding of CNFs as the carbon matrix within heterostructures provides fundamental insights into the electronic conductivity, electrochemical activity and cycling stability in anode materials with high theoretical capacities (alloys and metal chalcogenides). Based on the insights, we conclude the future perspectives on the critical issues, challenges and research directions in designing one-dimensional carbon nanofiber based materials via electrospinning.