Goglio, et al (2024) The performance of biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More waste-derived electrodes in different bio-electrochemical applications. Journal of Power Sources. https://doi.org/10.1016/j.jpowsour.2024.235623

Researchers recently explored biochar-based electrodes made from organic waste (OW) and wood chips (WC) to improve bio-electrochemical systems (BES), which generate bioenergy and valuable chemicals. BES configurations included microbial fuel cells (MFCs), microbial electrolysis cells (MECs), and microbial electrosynthesis (MES), all geared toward sustainable energy and chemical production.

In MFCs, WC biochar outperformed OW by generating twice the voltage, reaching 200 mV versus OW’s 100 mV. WC biochar also excelled in MECs, producing 3.6 mL of methane daily, compared to OW’s 3.0 mL. This methane had a higher concentration, making WC biochar a more efficient fuel source.

MES experiments focused on converting carbon dioxide (CO2) into acetic acid, a valuable bio-based compound. Here, WC biochar produced acetic acid at a rate ten times higher than OW biochar, thanks to its carbonaceous, graphite-like structure, which facilitated better microbial attachment and electron transfer.

The study highlights that WC biochar’s performance is due to its high surface area and structured composition, which supports efficient microbial activity and electron flow. This makes WC biochar a promising low-cost, waste-derived option for BES applications, with potential to scale up for larger energy production and waste recycling initiatives. Future studies will explore scaling this technology to meet industrial needs for renewable bioenergy and carbon recycling.