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Directed self-powered bioelectrochemical synthesis of silver dendrite
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DOI：10.1016/j.elecom.2026.108181.png)
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Abstract
En 中文
Dendritic Ag is of considerable interest because its branched architecture offers high surface area and abundant low-coordination sites, making it attractive for catalysis and sensing applications. Here, a self-powered bioelectrochemical route for dendritic Ag synthesis was demonstrated in a dual-chamber microbial fuel cell (MFC). Under self-powered reduction conditions, Ag deposits evolved progressively from early-stage short branches to well-developed dendritic structures over 4-16 h, indicating a dynamic non-equilibrium growth process. Among the tested external resistance conditions, 500 Omega provided the most favorable environment for dendritic development, yielding well-defined pine-needle-like Ag structures. Meanwhile, Ag(I) removal reached 95% after 4 h operation. Dendritic Ag morphology was strongly regulated by Ag(I) concentration and speciation, with lower AgNO3 concentration (0.1-1 mM) favoring finer pine-needle-like dendrites and a higher concentration (10 mM) promoting larger trunks and leaf-like branches. Coordinated Ag(I) in silver ammonia solution further led to denser interconnected branched networks. These findings demonstrate that dynamically changing current density and Ag(I) reduction concentration/speciation jointly govern dendritic Ag growth in MFCs, extending microbial electrochemical systems from metal recovery toward morphology-controlled metallic nanostructure synthesis.
Keywords:
Microbial fuel cell
Ag dendrites
Self-powered synthesis
Silver recovery
COD removal
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