A.Prof. Weiyong Yuan, Zhejiang University, China
Title: Self-assembled hematite-based core-shell heteronanostructured arrays for photoelectrochemical water splitting
Abstract: Significantly boosting the water splitting performance of the hematite-based photoanodes is highly challenging but desirable for realizing their practical applications. Self-assembly of water oxidation catalysts on hematite to form core-shell structures could be a promising strategy. Our group has previously developed various effective WOR catalysts and demonstrated their applications for electrochemical water splitting. We have also fabricated various TiO2 and ZnO-based composite photoanodes for enhanced photoelectrochemical (PEC) water splitting utilizing the effects of sensitizers and n-p heterojunctions. Based on these achievements, we are recently exploring the self-assembly of hematite-based core-shell heteronanostructured array for PEC water splitting. In this presentation, I will introduce our work on the design, self-assembly, PEC water splitting applications, and enhancement mechanism of the hematite-based core-shell nanostructured arrays. This study could not only provide novel strategies for developing highly efficient hematite-based photoanodes for water splitting, but shed light on the mechanism for self-assembly and for synergistic effects of the core-shell structures, which can be further extended for broad applications in the fields such as sensing, energy, and environment.
Prof. Fanian Shi, Shenyang University of Technology, China
Title: Research progress of metal complexes and metal oxides as new-generation anode materials of lithium-ion batteries
Abstract: Our team studied the electrochemical properties of new anode materials, especially the preparation of manganese-cobalt-nickel-based polymetal coordination polymers (CPs), explored the structures and lithium storage properties of lithium ionic batteries (Libs), the combination of CPs, metal oxides, and the influence of rare earth elements on lithium storage properties of the oxide composites. The following three conclusions are summarized: 1. Under the same conditions, different crystal structures have a great impact on electrochemical performance, relatively speaking, the higher capacity of complexes are with more stable structure; 2. Comparing with polymetallic coordination polymers of the same structure, the electrochemical properties of manganese-cobalt and nickel are different; 3. Cerium plays a stable role on the electrochemical properties of metal complexes, mainly inhibiting the decomposition of the complex structure and providing lithium ion transport channels to improve lithium storage performance.
Prof. Hong Qi
Harbin Institute of Technology, China
Title: Integrated technology of biological photothermal precise diagnosis and treatment based on multifunctional nanoparticles
Abstract: According to the data released by WHO in 2019, the incidence rate and mortality rate of cancer worldwide are still rising rapidly. Cancer has become an important threat to human health. Early diagnosis and treatment are very important to improve the survival rate of cancer patients. Traditional diagnostic methods, including CT, MRI and other technologies, have the disadvantages of expensive equipment, inconvenient to carry and radiation damage to human body. Conventional treatment, such as surgery, chemotherapy and radiotherapy, has the disadvantages of trauma, side effects, recurrence, and even some cases can not be operated. In order to overcome the technical obstacles of traditional diagnosis and treatment methods, the potential targeted precise diagnosis and treatment technology has been developed. The diagnosis is fast and accurate, low cost and no side effects, while the treatment has the advantages of small damage, wide application and small side effects, which has been supported by the United States, China and other countries. Meanwhile, nanotechnology has been developed in an all-round way in recent years, especially in the biomedical field. The diagnosis and treatment technology based on micro-nano particles has been widely concerned because of its accuracy and efficiency. Here, the integrated research of photothermal diagnosis and treatment of biological tissue with multifunctional nanoparticles as contrast agent / hyperthermia agent is introduced. In the aspect of diagnosis, it mainly includes: theory and experiment of diffuse light tomography in biological tissue, fluorescence imaging method, and biological tissue imaging method based on time-frequency light information fusion. In terms of photothermal therapy, it mainly includes: the mechanism and regulation of photothermal transformation of plasmonic nanoparticles in biological tissues, the mechanism and model of photothermal transformation and transmission of biological tissues containing nanoparticles, and the precise and rapid regulation of temperature in the target area of hyperthermia.
A.Prof. Gangtao Liang
Dalian University of Technology, China
Title: Microscale Heat Dissipation Surface for High-Heat-Flux Cooling
Abstract: Aggressive developments of high-heat-flux devices (e.g., advanced computer chips, spacecraft electronics, hybrid vehicle power electronics and fuel cells) and ultra-high-heat-flux devices (e.g., particle accelerators, rocket nozzles, fusion reactors, radar systems, and laser weapons) have incapacitated the conventional fan-cooled and various single-phase cooling techniques. Instead, two-phase cooling, i.e., boiling, which utilizes liquid/vapor phase-change latent heat in combination with temperature-rise sensible heat, shows its great advantages in tackling these above-mentioned cooling concerns. This keynote lecture will report pool boiling heat transfer enhancement on the micro-pit surfaces. Microscale pits fabricated on plain surface are able to reduce boiling incipience superheat, and improve both nucleate boiling heat transfer coefficient and critical heat flux (CHF). Boiling enhancement magnitudes have a weak dependence on the micro-pit diameter, but increase monotonously with decreasing the pit depth. There exists an optimum pit-to-pit spacing for the maximum boiling enhancements, which is virtually identical to bubble departure diameter, and estimated using the capillary length. The major mechanism behind is that this spacing is favorable for alleviating hydrodynamic instabilities induced by the counterflow between liquid inflow and vapor outflow. The highest heat transfer coefficient and CHF using water as fluid under the present conditions are 70.0 kW/m2K and 165.7 W/cm2, improved by 58.8% and 33.7% compared to the plain surface, respectively.