Chun-Sheng Li

Bio: Chun-Sheng Li is an academic researcher from North China University of Science and Technology. The author has contributed to research in topics: Transmission electron microscopy & Ionic liquid. The author has an hindex of 3, co-authored 3 publications receiving 68 citations. Previous affiliations of Chun-Sheng Li include Nankai University.

Ultrafine Mn3O4 Nanowires/Three-Dimensional Graphene/Single-Walled Carbon Nanotube Composites: Superior Electrocatalysts for Oxygen Reduction and Enhanced Mg/Air Batteries.

Abstract: The exploration of highly efficient catalysts for the oxygen reduction reaction to improve sluggish kinetics still remains a great challenge for advanced energy conversion and storage in metal/air batteries. In this work, ultrafine Mn3O4 nanowires/three-dimensional graphene/single-walled carbon nanotube catalysts with an electron transfer number of 3.95 (at 0.60 V vs Ag/AgCl) and kinetic current density of 21.7–28.8 mA cm–2 were developed via a microwave-irradiation-assisted hexadecyl trimethylammonium bromide (CTAB) surfactant procedure to greatly enhance the overall catalytic performance in Mg/air batteries. To match the electrochemical activity of the cathode catalysts, a large-scale Mg anode prepared with micropersimmon-like particles via a mechanical disintegrator and Mg(NO3)2–NaNO2-based electrolyte containing 1.0 wt % trihexyl(tetradecyl)phosphonium chloride ionic liquid were applied. Combining the ultrafine Mn3O4 nanowires/three-dimensional graphene/single-walled carbon nanotube as an efficient el...

Screw dislocation-driven t-Ba2V2O7 helical meso/nanosquares: microwave irradiation assisted-SDBS fabrication and their unique magnetic properties

Abstract: Triclinic (t-) Ba2V2O7 helical-like meso/nanosquares assembled from self-spiraling nanosheets have been controllably synthesized by a high-efficiency microwave irradiation-assisted surfactant process. The microstructure and morphology of the as-prepared t-Ba2V2O7 products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results show that the spirals of stacked nanosheets grow along the z-axis of microsquares, leading to the formation of a helical shape. Based on parallel experiments and theoretical analysis of t-Ba2V2O7 helical mesosquares at different reaction stages, the formation mechanism has been proposed to be a “self-assembly–dissolution–recrystallization–Ostwald-ripening” mechanism. The helical structures with uniform morphology and size may find promising applications in a variety of fields. The SDBS-assisted microwave irradiation method offers an easy path to the controllable fabrication of helical Ba2V2O7meso/nanomaterials, which can be readily extended to the development of functional structures of other alkaline earth vanadates. Moreover, it is found that the helical-like materials exhibit unique magnetic properties, corresponding to shape evolutions with different particle sizes at continuous reaction time.

Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond

Abstract: Spinels with the formula of AB2O4 (where A and B are metal ions) and the properties of magnetism, optics, electricity, and catalysis have taken significant roles in applications of data storage, biotechnology, electronics, laser, sensor, conversion reaction, and energy storage/conversion, which largely depend on their precise structures and compositions. In this review, various spinels with controlled preparations and their applications in oxygen reduction/evolution reaction (ORR/OER) and beyond are summarized. First, the composition and structure of spinels are introduced. Then, recent advances in the preparation of spinels with solid-, solution-, and vapor-phase methods are summarized, and new methods are particularly highlighted. The physicochemical characteristics of spinels such as their compositions, structures, morphologies, defects, and substrates have been rationally regulated through various approaches. This regulation can yield spinels with improved ORR/OER catalytic activities, which can furth...

K2V6O16·2.7H2O nanorod cathode: an advanced intercalation system for high energy aqueous rechargeable Zn-ion batteries

Abstract: 1D nanorods of the layered material K2V6O16·2.7H2O (KVO) are implemented for the first time as cathode materials in secondary aqueous rechargeable Zn-ion batteries (ARZIBs) and exhibit excellent electrochemical Zn storage properties. This cathode material delivers a reversible capacity of 296 mA h g−1 over 100 cycles. At current densities of 1000, 3000, and 5000 mA g−1 for 700 cycles, the electrode displays reversible capacities of 223, 177, and 138 mA h g−1, for approximately 170, 300, and 230 cycles, respectively. In addition to these properties, it withstands over 500 cycles at an applied current density of 6000 mA g−1 with nearly 82% capacity retention. The battery offers a specific energy of 128 Wh kg−1 at a specific power of 5760 W kg−1, revealing the advantages of the material in an eco-friendly atmosphere.

Transition metal oxide-based oxygen reduction reaction electrocatalysts for energy conversion systems with aqueous electrolytes

Abstract: In the past decades, there has been a strong incentive to develop electric vehicles by the introduction of batteries to reduce the dependence on petroleum oil and mitigate the tailpipe emissions. Lithium-ion batteries have dominated the electric vehicle market due to their high capacity and energy efficiency. However, the insufficient energy density of lithium-ion batteries is still a big problem for the development of electric vehicles. Metal–air batteries have been considered among the most promising power sources for electric vehicles due to some attractive advantages such as high energy density, low cost and environmental friendliness. One of the most important issues for metal–air batteries is developing oxygen reduction reaction catalysts with high catalytic activity and stability. Transition metal oxides are a series of important catalysts for the oxygen reduction reaction in alkaline solution. The purpose of this paper is to provide a comprehensive review of the recent progress in transition metal oxide-type catalysts for the ORR in aqueous media, including simple transition metal oxide-type catalysts, perovskite-type catalysts, spinel-type catalysts and other ternary transition metal oxides catalysts (such as double perovskite oxides, pyrochlore oxides, Ruddlesden–Popper oxides, LiCoO2-related oxides, and Mn-based mullite oxides). Moreover, we also discuss the factors influencing the transition metal oxide-type catalysts for the ORR in metal–air batteries with aqueous electrolytes.

Current Progress on Rechargeable Magnesium–Air Battery

Abstract: Rechargeable Mg–air batteries are a promising alternative to Li–air cells owing to the safety, low price originating from the abundant resource on the earth, and high theoretical volumetric density (3832 A h L−1 for Mg anode vs 2062 A h L−1 for Li). Only a few works are related to the highly reversible Mg–air batteries. The fundamental scientific difficulties hindering the rapid development of secondary Mg–air cells are attributed to the poor thermodynamics and kinetics properties mainly owing to the MgO or MgO2 insulating film as the initial discharge product on air–breathing cathode, contributing to the increase of a large overpotential and a high polarization. Very recently, remarkable progress on rechargeable Mg–air batteries is trying to overcome the major limitations in organic electrolytes via the combination of the first–principle calculation and experimental study. Therefore, this progress report highlights a comprehensive and concise survey of the major progress in the history of secondary Mg–air batteries, and the detailed illustrations of corresponding reaction mechanisms. The overview is devoted to open up a new area for manipulating the nanostructures to control the ideal reaction pathway in novel cell configuration and to fully understand the future Mg–air battery with improved energy density and cycling ability.