Fig. 8.

Images of the benthic microbial fuel cell done by Prof. Tender group (a,b) and by Prof. Beyenal group (c,d). A basic mobile phone charged by a stack of 12 ceramic microbial fuel cells (e), and the Pee Power™ urinal tested on the University of the West of England, Bristol campus (f). (Fig. 8a, b adapted from Ref. [461] with permission of Elsevier, Fig. 8c, d Photo Credit: Prof. Zbigniew Lewandowski and Prof. Haluk Beyenal, Fig. 8e Adapted from Ref. [473], published by the PCCP Owner Societies, CC BY 3.0 (https://creativecommons.org/licenses/by/3.0/)).