Membrane engineering of Escherichia coli based on “Building bridges” and “Digging tunnels” to improve electro-fermentation of succinate

•Electro-fermentation combines bioelectrochemical system with fermentation.•Cathodic electro-fermentation is efficient for synthesis of reductive products.•“Building bridges” and “Digging tunnels” improve transport of electron.•Succinate yield can be increased with the additional supplement of electron.