凯发_Huiming Cheng

Speaker-Huiming Cheng

Huiming Cheng
Institute of Metal Research, CAS, China

Dr. Hui-Ming Cheng is Professorand Director of Advanced Carbon Materials Division of Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences. He is a member of Chinese Academy of Sciences. He graduated from Hunan University in 1984, and received his Master and Ph. D degree in 1987 and 1992 from the Institute of Metal Research, Chinese Academy of Sciences. He worked at Kyushu National Industrial Research Institute, AIST, and Nagasaki University in Japan from 1990 to 1993, and MIT, USA from 1997 to 1998.

Dr. Cheng is mainly working on carbon nanotubes, graphene, energy storage materials, photocatalytic semiconducting materials, and high-performance bulk carbon materials. He editedthe first book on carbon nanotubes in Chinese, published over 400 peer-reviewedpapers on Nature, Nature Mater., Nature Commun., PNAS,Adv. Mater., JACS, Angew. Chemie, Adv. Funct. Mater., Adv. Energy Mater., ACSNano, J. Mater. Chem., Carbon, etc. He has received several international and nationalawards, including National Natural Science Award (2nd class) in 2006,the Charles E. Pettinos Award (American Carbon Society, USA) in2010, and the Prizefor Scientific and Technological Progress of Ho Leung Ho Lee Foundation in 2010. He is the Editor of Carbonsince 2000 and the Editor-in-Chief of NewCarbon Materials since 1998. Prof. Cheng was the co-chairman of the WorldConference on Carbon in 2002 (Beijing) and 2011 (Shanghai), and he has givenmore than 70 plenary/keynote/invited talks in international conferences andsymposia. Dr. Cheng was a recipient of TCT Fellowship at Nanyang TechnologicalUniv. in 2002, is honorary professor of the University of Queensland,Australia, and guest professor of a few Chinese universities.

Title：Graphene materials for clean energy applications

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Abstract

Graphene materials attract increasing interest in clean energy applications, such as solar cells, supercapacitors, lithium ion batteries, Li-S batteries, and OLED devices.

For supercapacitors and lithium ion batteries, it is found that graphene composites have a significant improvement in their capacity, rate capability and cycling stability. The roles of graphene are found mainly to form a conductive network, increase electron and lithium ion conductivity, and anchor and trap electrode materials, and their efficiency is dependent upon how strong the interaction between graphene and electrode materials is.

Graphene materials can be used in Li-S batteries. A unique sandwich structure with pure sulfur sandwiched between two graphene membranes was designed for a Li-S battery to trap polysulfides. Furthermore, a graphene membrane was used as both current collector and buffer layer on a polymer separator. These batteries show significant improvement in cyclability and capacity, because the electrode with the graphene membrane can provide rapid ion and electron transport paths, accommodate sulfur volumetric expansion, and store and reuse migrated polysulfides to alleviate the shuttling effect. By incorporating a graphene foam (GF) fabricated by template-directed CVD with reduced graphene oxide aerogel, a three-dimensional hybrid nested hierarchic graphene macrostructure was used as a current collector to solve the low sulfur loading and sulfur content issues of Li-S batteries.

Graphene materials can also be widely used in flexible energy storage devices. For example, a graphene/PANi composite membrane is good electrode material for flexible supercapacitors; by coating active materials on GF, an anode and cathode were made to assemble a thin, lightweight and flexible lithium ion battery and Li-S battery, which show high rate capability and capacity, and excellent flexibility.

Finally, high-quality graphene transparent conducting films by CVD can be used as transparent electrode to assemble flexible OLEDs with excellent performance.