Novel tape-cast SiOC-based porous ceramic electrode materials for potential application in bioelectrochemical systems

Silva, Thamires Canuto de Almeida e; Kettermann, Viviane Fernandes; Pereira, Cláudia C. L.; Simões, Manuel; Wilhelm, Michaela; Rezwan, Kurosch

doi:10.1007/s10853-018-03309-3

Cited by 13 publications

(12 citation statements)

References 65 publications

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“…The carbon‐black containing material (E3) showed a lower wettability (higher contact angle), because the additional carbon content of the composition resulted in a smaller overall amount of hydrophilic silica. Previous results of water and n ‐heptane vapor adsorption measurements additionally confirmed this increasing hydrophilicity of the synthesized anode with increasing pyrolysis temperature [17] …”

Section: Resultssupporting

confidence: 65%

“…As the pure carbon black filler exhibits an SSA of 44.8 m 2 g −1 , the carbon black‐containing anode (E3) showed higher SSA (39.8 m 2 g −1 ). Pore size distribution previously measured by mercury intrusion porosimetry [17] (Figure S6) showed a volume of pores with diameters mainly within the range of mesopores (pore sizes between 2 nm and 50 nm) and macropores (above 50 nm) for anode material E1. Materials pyrolyzed at 1000 °C (E2 and E3), showed a higher volume of macropores due to the above‐mentioned collapse of micropores [35] .…”

Section: Resultsmentioning

confidence: 80%

“…After pyrolysis, anodes showed a geometrical surface area (GSA) between 19.9 and 25.3 cm 2 and sufficient mechanical stability for handling in further testing. Additionally, previous studies showed good chemical stability of the anodes [17] . To induce pore formation, ca.…”

Section: Resultsmentioning

confidence: 97%

“…Nitrogen adsorption isotherms of the anode pyrolyzed at 500 °C (E1) and analyzed by BET method [17] show a high SSA of 263.4 m 2 g −1 , which is related to the formation of micropores (pore diameter below 2 nm) during the partial polymer‐to‐ceramic conversion as a result of pyrolysis temperatures below 800 °C [19,35] . Increasing the temperature to 1000 °C led to lower specific surface areas of 6.6 m 2 g −1 for carbon black‐free (E2) and 39.8 m 2 g −1 for carbon black‐containing anode (E3).…”

Section: Resultsmentioning

confidence: 99%

“…Among the diverse classes of alternative anode materials, porous ceramic materials seem a suitable choice, as they offer the possibility to tune the pore structure, density, and chemical stability [16] . To approach the use of these advantages and surpass the inherently non‐conductive nature of ceramics, polymer‐derived ceramics (PDCs) arise as a promising alternative as electrodes for BES [8,17] . PDCs are a new class of material that is synthesized from a suitable polymeric precursor that is converted to ceramic through cross‐linking followed by pyrolysis [18,19] .…”

Section: Introductionmentioning

confidence: 99%

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Impact of Surface Properties of Porous SiOC‐Based Materials on the Performance of Geobacter Biofilm Anodes

et al. 2021

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Porous SiOC tapes were studied as anodes for bioelectrochemical system (BES) using Geobacter spp. as an electroactive microorganism (EAM). The ceramic anodes were produced by tape‐casting of poly(silsesquioxanes), tailoring the surface properties by incorporating graphite and carbon black, and changing the pyrolysis temperature. By varying these parameters, the specific surface area, the hydrophilicity, and the roughness were adjusted, with the pyrolysis temperature playing a major role. When used as anodes at 0.2 V vs. Ag/AgCl sat. KCl in the BES, maximum current densities relative to the geometric surface area (jGSA) up to 5.8 A m−2 were achieved. Microbial community analysis of the biofilm shows the dominant presence of Geobacter spp. as the EAM. Benchmarking the performance of the anodes of this study with anodes using the same EAM demonstrates that porous SiOC anodes are a promising class of materials, as they show jGSA comparable to carbon‐based anodes.

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Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of Surface Properties of Porous SiOC‐Based Materials on the Performance of Geobacter Biofilm Anodes

et al. 2021

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Processing of Ceramics from Polysil(sesquioxane)‐Type Precursors: Coatings, Tapes, Tailored Surfaces, and Porosity Control

Scheffler

2023

Adv Eng Mater

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Poly(silsesquioxane)‐based polymer‐derived ceramics (PDCs), may be manufactured by a great variety of processes and process combinations leading to ceramic parts seven with high functionality. Advantage of the use of poly(silsesquioxane)s as starting materials with a defined amount of oxygen is that low‐temperature‐processing steps such as shaping and cross‐linking may be carried out in air, and a disadvantage often discussed is a maximum service temperature below 1200 °C. In this article, the focus is set to PDC tapes, coatings, tailored surfaces, and tailored porosity. And, a rough distinction is made between materials pyrolyzed below 1200 °C and far above 1200 °C. The later provides porosity formed by high‐temperature reactions between particulate fillers and the ceramic residue from pyrolysis.

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Tape casting of preceramic polymers toward advanced ceramics: A review

Hotza

Nishihora

Machado

et al. 2019

Int J Ceramic Engine & Sci

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In the last 20 years, tape casting, a standard wet‐shaping process to produce thin ceramics, has been applied to manufacture polymer‐derived ceramics (PDCs). Si‐based polymers, such as polysiloxanes and polysilazanes, also known as preceramic polymers (PCPs), have been used as precursors/binders replacing conventional raw materials and additives for tape casting process. Thermal processing of PCPs is carried out at lower temperatures in comparison with classical ceramic sintering, particularly of carbides and nitrides. Furthermore, polymeric precursors can be converted into hybrid or composite ceramics, when parts of the polymers remain unreacted. Inert or reactive fillers might be used to reduce both shrinkage and porosity inherently caused by the weight loss occurring during polymer pyrolysis while forming new ceramic phases in the final materials. Alternatively, pore formers might also be added to tailor pore shape, connectivity, and volume (macroporosity). Nevertheless, current equipment and process parameters for tape casting‐based products must be eventually adjusted to fit the characteristics of ceramic precursors. Therefore, the aim of this review is focused on listing and discussing the efforts to produce PDCs using tape casting as a shaping technique. Interactions of system components and effects of treatment, particularly thermal stages, on final microstructure and properties are stressed out. Gaps in the literature concerning processing optimization are pointed out, and suggestions are given for further development of PDCs produced by tape casting.

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Novel tape-cast SiOC-based porous ceramic electrode materials for potential application in bioelectrochemical systems

Cited by 13 publications

References 65 publications

Impact of Surface Properties of Porous SiOC‐Based Materials on the Performance of Geobacter Biofilm Anodes

Impact of Surface Properties of Porous SiOC‐Based Materials on the Performance of Geobacter Biofilm Anodes

Processing of Ceramics from Polysil(sesquioxane)‐Type Precursors: Coatings, Tapes, Tailored Surfaces, and Porosity Control

Tape casting of preceramic polymers toward advanced ceramics: A review

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