Yuena Sun

Bio: Yuena Sun is an academic researcher from Hebei University. The author has contributed to research in topics: Tafel equation & Overpotential. The author has an hindex of 5, co-authored 16 publications receiving 57 citations.

A simple and high-throughput method of ultrasonic extraction-capillary electrophoresis for determination of melamine in milk

Abstract: A simple, rapid, sensitive, and low cost method of ultrasonic extraction (USE) and capillary electrophoresis (CE) for the determination of melamine in milk is developed The most widely used extraction methods of melamine (SPE and LLE) were compared with ultrasonic-assisted extraction by evaluating simplicity, cost and sample clean-up effect, and the conditions of CE were optimized The melamine was extracted by acetonitrile under the action of ultrasonic energy After centrifuging, diluting and filtering, the extract was analyzed by CE directly The determination used 20 mM NaH2PO4 as running buffer (pH 26), UV detection at 208 nm, and an applied voltage of 18 kV The proposed method demonstrated good performance concerning linearity (R2 = 09989), precision (26–48%), limit of detection and quantification (LOD, 0163 mg kg−1; LOQ, 0542 mg kg−1) and accuracy (851–983%) The proposed method is rapid, convenient and low-cost for the determination of melamine in milk products

Metal–organic frameworks and their derivatives with graphene composites: preparation and applications in electrocatalysis and photocatalysis

Abstract: Metal–organic frameworks (MOFs) are a special class of porous materials and have been widely explored for applications in supercapacitors, catalysts, and adsorbents, because of their large specific surface areas and tunable structure and composition. However, traditional MOFs suffer from poor conductivity and low stability, which limit their efficiency in catalysis and other applications that require good electrical conduction. To overcome this limitation, a composite made of electrically conducting graphene and MOFs is conceptually a viable solution. This review summarizes the latest preparation methods for MOF/graphene materials with a focus on applications in electrocatalysis and photocatalysis. We aim to assist existing researchers to obtain a fast and holistic overview of MOF and their derivatives with graphene composites in catalysis, and also the new comers to quickly catch up with the latest development in this field.

Design of hollow carbon-based materials derived from metal–organic frameworks for electrocatalysis and electrochemical energy storage

Abstract: Hollow nanostructured materials are suitable for electrochemical reactions because of their unique internal cavity and short transport path. Carbon-based nanomaterials, including simplex carbon materials, heteroatom-doped carbon materials, carbon-transition metal nanoparticle composites, and carbon-transition metal compound composites, are promising electrode materials because of their high conductivity and stable structure. Hollow carbon-based nanomaterials, which possess the features of the aforementioned materials, have become a research hotspot in electrochemical energy storage and electrocatalysis. The excellent characteristics of metal–organic frameworks (MOFs) make them an ideal material for constructing hollow carbon-based nanomaterials. In this article, the process of preparing MOF-derived hollow carbon-based materials and their applications in electrochemical energy storage and electrocatalysis are reviewed. First, the various methods for preparing MOF-derived hollow carbon-based materials are introduced, and the characteristics of each method are analyzed. Second, the applications of MOF-derived hollow carbon-based materials in the oxygen evolution reaction, oxygen reduction reaction, hydrogen evolution reaction, lithium-ion batteries, sodium-ion batteries, lithium–sulfur batteries, and supercapacitors are analyzed and summarized. Finally, research directions for further development of MOF-derived hollow carbon-based materials are proposed.

Applications of nano-porous graphene materials – critical review on performance and challenges

Abstract: The design and fabrication of 2D nano-porous architectures with controllable porosity and pore structure, as well as unique properties at the nanoscale are critical for applications such as separation, sensing, energy and catalysis. Perforation strategies across 2D materials, primarily graphene, have shown promising opportunities to develop nanostructures with tunable ranges of pore size distribution, pore density and uniformity. In addition, the perforated graphene structures exhibit improved properties in terms of plasmonic diffusion, catalytic activity and thermo-electrical properties compared to dense 2D materials and are opening new avenues for the development of responsive or reactive materials. This review presents and discusses the very recent developments in the synthesis of perforated graphene-based materials and correlates the morphology and other properties of such 2D nano-porous materials to their performance in applications such as separation, sensing and energy. Challenges related to the controlled engineering and manufacturing of such nanostructures particularly from a scalability point of view, as well as potential avenues for performance improvements through alternative 2D perforated materials are also critically evaluated.