Timoth Mkilima
Microbial electrochemical systems couple extracellular electron transfer with substrate oxidation or CO2 reduction, but their performance is constrained by biofilm heterogeneity, transport gradients, electrode polarization, and community drift. This review examines intelligent plasmonic bio-holoelectrochemical systems (iPBHS) as an evidence-derived reference architecture integrating transparent bioelectrochemical reactors, optically addressable electrodes, structured-light delivery, spatial sensing, and model-predictive control. The synthesis focuses on four themes: plasmonic modulation of biomass-normalized electron transfer, spatial transfer of projected photon fields into electrochemical responses, feedback control under safety and conservation constraints, and electron-product carbon routing. Particular attention is given to mechanistic discrimination using resonant and off-resonant illumination, temperature-equivalent and structurally matched controls, spatially resolved measurements, and factorial interaction analysis. Evidence from microbial electrosynthesis, plasmonic photoelectrochemistry, optogenetic biofilms, digital twins, and reactor-scale engineering is critically compared, while incompatible component-level gains are not pooled. Carbon, electron, energy, and life-cycle accounting provide the basis for evaluating system performance and scalability. No complete iPBHS prototype has yet been demonstrated, making cumulative validation of its constituent mechanisms the central research priority.