Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Zeitschriften |
| DOI | 10.1002/celc.202500008 |
Lizenz  |
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| Titel (primär) | Biochar cathodes for bioelectrochemical systems: understanding the effect of material heterogeneity on performance for abiotic hydrogen evolution reaction |
| Autor | Pouresmaeil, S.; Schliermann, T.; Schmidt, M.
; Harnisch, F.
; Kretzschmar, J. |
| Quelle | ChemElectroChem |
| Erscheinungsjahr | 2025 |
| Department | MIBITECH |
| Band/Volume | 12 |
| Heft | 20 |
| Seite von | art. 2500008 |
| Sprache | englisch |
| Topic | T7 Bioeconomy |
| Supplements | Supplement 1 |
| Keywords | biochar; cathode; heterogeneity; overpotential; physiochemical characterization |
| Abstract | Granular carbon-based cathodes in carbon dioxide-reducing bioelectrochemical systems (CO2-reducing BES) feature high biocompatibility and stability. Wood-based biochar is gaining popularity in (bio)electrochemical applications due to its sustainability and reduced environmental impact. Yet, previous studies primarily examined lab-scale biochars. This study investigates how heterogeneity of industrial-scale granular biochars (GBs) influences their electrocatalytic activity for hydrogen evolution reaction (HER) in the nexus of CO2-reducing BES. Significant variations are identified in overpotentials for HER at −1 mA cm−2 (η-1 mA cm−2) among the GB-based cathodes. Beechwood-derived GB pyrolyzed at 740 °C shows the lowest η-1 mA cm−2(223.6 ± 30.0 mV), outperforming birchwood-derived GB at 700 °C (503.5 ± 4.9 mV) and granular graphite (608.3 ± 19.5 mV). Despite its superior performance, beechwood-based GB shows high heterogeneity. Such heterogeneity underlies different physicochemical properties, likely due to uneven temperature distribution in industrial pyrolysis. The remarkable performance of beechwood-based GB pyrolyzed at 740 °C is attributed to its higher electrical conductivity, higher degree of carbonization, favorable H/C ratios, higher disorder in carbonaceous structure, and suitable porosity. The results highlight the influence of the wood type, the importance of systematic GB characterization, and the necessity to optimize industrial-scale biochar production to achieve homogeneous and high-performance biochar. |
| dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=31108 |
| Pouresmaeil, S., Schliermann, T., Schmidt, M., Harnisch, F., Kretzschmar, J. (2025): Biochar cathodes for bioelectrochemical systems: understanding the effect of material heterogeneity on performance for abiotic hydrogen evolution reaction ChemElectroChem 12 (20), art. 2500008 10.1002/celc.202500008 |
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