Opening size optimization of metal matrix in rolling-pressed activated carbon air–cathode for microbial fuel cells

•A power density of 2151mWm−2 was achieved using an optimized matrix of 40 mesh.•Power exhibited the same trend as that of linear sweep voltammetry at −0.2 to 0V.•An optimized matrix can significantly decrease the charge transfer resistance.•Mesh density had a better correlationship with power densi...

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