Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 84: Heterostructures and Interfaces

HL 84.5: Talk

Friday, March 24, 2017, 10:30–10:45, POT 151

Iron-based Nitrogen doped Graphene Aerogels Derived from Seaweed Waste as Electrocatalysts for Efficient Electrochemical Energy Conversion and Storage — •Long Liu¹, Huaping Zhao¹, Rui Xu¹, Huanming Zhang¹, Yi Wang¹, Dongjiang Yang², and Yong Lei¹ — ¹Institut für Physik & IMN MacroNano, 98693 Ilmenau, Germany — ²School of Environmental Science and Engineering, 266071 Qingdao, China

Advanced electrocatalysts are critical towards boosting the performance of electrochemical energy storage and conversion devices (e.g., lithium ion batteries, fuel cells). Here, we report our recent achievement about preparing bulky hierarchical Fe-based nanoparticles (NPs)/N-doped graphene aerogels (NGAs) through seaweed-derived biomass conversion strategy as highly-efficient electrocatalysts for electrochemical energy storage and conversion applications. The as-prepared unique Fe2N core-shell/NGAs exhibit highly desirable performance in oxygen reduction reaction (ORR), which is superior to costly commercial Pt/C electrocatalysts. Meanwhile, when transforming Fe2N core-shell / NGAs into Fe2O3 hollow nanoparticles (HNPs) / NGAs via the nanoscale Kirkendall effect, the as-obtained HNPs/NGAs display excellent energy storage performance in lithium ion batteries with high specific capacity, excellent rate capability and good cycle stability. These results demonstrate a sustainable approach to synthesize efficient and multifunctional electrocatalysts based on seaweed waste for electrochemical energy storage and conversion applications.