Shichun MuWuhan University of Technology, China
Dr. Shichun Mu received the PhD degrees from Chinese Academy of Science in 2001, and then was a postdoctoral at State Key Laboratory of Advanced Technology for Materials Synthesis and Processing at Wuhan University of Technology. In 2003 and 2006, he was promoted to be an associated professor and a full Professor, respectively, at the same institution. He was an academic visitor scholar (from 2007 to 2008) at the Inorganic Chemistry Laboratory at University of Oxford. Dr. Mu’s current research interests include graphene syntheses and applications, low Pt and non-Pt catalysts towards oxygen reduction reaction (ORR) and membrane electrode assemblies (MEA) for polymer electrolyte membrane fuel cells, and materials for lithium ion batteries. Currently, Dr. Mu is the expert reviewer of European Graphene Flagship projects, the board committee member of the International Academy of Electrochemical Energy Science (IAOEES), the editorial board member of Scientific Reports (Nature Publishing Group), the editor of the Frontiers in Energy Research (section Energy Storage), and the senior editor of the Journal of Nanoscience Letters. He has published more than 120 peer-reviewed technical articles and applied for 84 invention patents involving graphene materials, fuel cells and lithium ion batteries.
Title：PEM Fuel Cell Catalysts Based on Engineered Graphene
SymposiumB10 Fuel Cells
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Abstract
Hitherto, the low electrochemical stability of the catalysts is still one of the big issues hindering the commercial application of proton exchange membrane (PEM) fuel cells [1]. graphene nanosheets (GNS) have attracted attention as a unique 2D material with really large theoretical specific surface area, high electrical conductivity and excellent chemical stability [2]. However, the surface chemical inertness and the poor structural stability of 2D GNS make metal nanoparticles (NPs) possess a low efficiency towards oxygen reduction reaction (ORR) and a short lifetime for PEM fuel cells. In this work, to address the issue of the inert surface, more functionalized GNS and heteroatom doped GNS are introduced with highly dispersed metal NPs on GNS, enhancing the ORR activity and the interaction between metal-support. For example, the sulfonic acid group-grafted RGO supported Pt catalysts show a higher catalytic activity and a lower loss rate of electrochemical active area (ECA) in comparison with that of the plain Pt/GNS and conventional Pt/C catalysts. In addition, significantly, to retackle the issue of the mass transfer caused by the restacking and folding of GNS, alternative 3D GNS nanocomposites including GNS/nano-carbon (or nano-ceramics) sandwiches, nanoceramic wedged GNS, and amorphous carbon@graphene, nano-ceramic@grpaphene core-shell architectures are constructed and applied in catalysts towards ORR. Take the Pt/GNS@TiC catalyst example, it has an outstanding high activity, and especially the ORR stability is remarkably improved. Even after 15000 potential cycles, the half-wave potential and mass activity towards ORR have almost no change. As results, these unique architectures of GNS with highly dispersed Pt NPs exhibit a much high catalytic activity towards ORR and an excellent electrochemical stability. Therefore the engineered grpahene holds a tremendous promise for applications in PEM fuel cells and other fields.
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