Hongwei ZhuTsinghua University, China
Dr. Zhu received his B.S. degree in Mechanical Engineering (1998) and Ph.D. degree in Materials Processing Engineering (2003) at Tsinghua University. After Post Doc. studies in Japan and USA, he began his independent career as a faculty member at Tsinghua University (2008~present). He is currently a Professor at the School of Materials Science and Engineering. His research interests involve macrostructure assembly and engineering of graphene and carbon nanotubes, flexible energy devices, sensors, and membranes for desalination and purification. His expertise includes chemical vapor deposition, solution processing for crystal growth and structure design of nanomaterials. He has authored 2 books and 5 invited book chapters, received 14 CN patents, 1 US patent and published 190+ papers in refereed international journals including Science, Adv. Mater., Nano Lett., ACS Nano, NPG Asia Mater. with a H-index of 42 (citations > 6000).
Title：Recent Developments in Graphene-Based Membranes: Structure, Mass Transport Mechanism and Potential Applications; Recent Advances in Carbon-on-Semiconductor Heterojunction Solar Cells
SymposiumB07 Desalination&B09 Solar Cells
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Abstract
Recent Developments in Graphene-Based Membranes: Structure, Mass Transport Mechanism and Potential Applications
The investigation on the selective mass transport properties of graphene-based materials remains to be a hot topic in recent years. Numerous novel mass transport properties in relation to the unique structure of graphene have been discovered, which are not possible in the state of art commercial membrane materials.
Our group has devoted to research on selective mass transportation through GO membranes since 2012. Despite the significant progresses on the uncovering of the novel mass transport properties of graphene-based membranes, their inherent properties still need to be enhanced when it comes to the application as practical filtration and separation membranes, for example, the mechanical strength for resisting high pressure, the long-time stability, etc. which needs more efforts to be devoted into this specific research area.
This presentation deals with the latest developments, including experimental discoveries and theoretical results, on understanding the novel mass transportation through graphene-based membranes, to cast a glance to the future applications in the fields of filtration, separation, water desalination, proton conductor and energy storage, etc. Based on the progresses made by our group and others, the latest developments on understanding the novel mass transportation through graphene-based membranes, including perfect graphene lattice, nanoporous graphene and GO membranes are overviewed in relation to their potential applications and a summary and outlook is provided to point out the opportunities and challenges in this arising field. The aspects discussed in this presentation may enable researchers to have an intimate knowledge of the present state of this topic, to better understand the mass transport mechanism and to optimize the structural design of graphene porous materials toward controllable membranes production.
Recent Advances in Carbon-on-Semiconductor Heterojunction Solar Cells
In the last few decades, the advances and breakthroughs of carbon materials have been witnessed in both scientific fundamentals and potential applications. The combination of carbon materials with traditional silicon semiconductors to fabricate solar cells has been a promising field of carbon science. The power conversion efficiency has reached 15%~18% with an astonishing speed and the diversity of systems intrigues even more researching interests. This talk covers the historical development and state of the art carbon/silicon heterojunction solar cells [1]. Firstly, the basic concept and mechanism of carbon/silicon solar cell are introduced with a specific focus on the solar cells assembled with carbon nanotubes and graphene due to their unique structures and properties. Then, several key technologies with special electrical and optical designs are introduced to improve the cell performance, such as chemical doping, interface passivation, anti-reflection coating and textured surface. Finally, the potential pathways and opportunities based on the carbon/silicon heterojunction are envisioned.
The aspects discussed in this talk may enable researchers to better understand the photovoltaic effect of carbon/silicon heterojunctions and to optimize the design of carbon-based photodevices for a wide range of applications. This simple carbon/semiconductor heterojunction solar cell is expected to play a great role in particular field to realize multi-function integrated portable or lightweight thin-film products, such as energy harvest for smart-phone, wearable-device, and even medical-monitor in the future.
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