Regensburg 2022 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster 2

CPP 17.10: Poster

Tuesday, September 6, 2022, 11:00–13:00, P2

Synthesis of Hard-Carbon Microspheres with Binary Size Distribution via Hydrothermal Carbonization of Trehalose — •Martin Wortmann¹, Waldemar Keil², Michael Westphal¹, Elise Diestelhorst³, Jan Biedinger¹, Bennet Brockhagen³, Günter Reiss¹, Claudia Schmidt², Klaus Sattler⁴, and Natalie Frese¹ — ¹Bielefeld University, Bielefeld, Germany — ²Paderborn University, Paderborn, Germany — ³Bielefeld University of Applied Sciences, Bielefeld, Germany — ⁴University of Hawaii, Honolulu, USA

Hard Carbon microspheres (HCS) were synthesized via hydrothermal carbonization (HTC) of trehalose and subsequent pyrolytic post-carbonization at 1000°C. It was found that HTC of trehalose, in contrast to other saccharides, results in a distinctly binary sphere diameter distribution with monodisperse small spheres and polydispers large spheres. Pore formation, as visualized by charge-compensated helium ion microscopy, results in a strong increase in BET surface area. The chemical composition and crystallinity were examined before and after pyrolysis using a variety of spectroscopic methods. Strong compositional similarities were found to other saccharide-derived hydrochars, with a cross-linked furan-based polymer-structure before, and nano-crystalline carbon structure after pyrolysis. The binary size-distribution and large BET surface area make trehalose-derived HCS a highly promising material for applications in energy storage or catalysis.