A new review in the journal Biochar examines how biochar's natural ability to exchange, store, and transfer electrons could improve its performance in pollution control and energy recovery. Instead of trying to make biochar mimic materials like activated carbon or graphene, the authors argue that its intrinsic redox properties, measured as electron exchange capacity, offer a distinct advantage in environmental applications. The review covers how redox-active groups in biochar can act as electron shuttles, aiding microbial processes, breaking down organic pollutants, and supporting anaerobic digestion. It also addresses challenges like measuring electron exchange capacity consistently, the impact of environmental aging on performance, and design strategies that focus on feedstock and pyrolysis conditions rather than expensive post-treatment.
