Redox cycling effect at microchannel-integrated sandwich electrodes consisting of a suspended mesh and a substrate-bound planar electrode

•Alignment-less fabrication of microchannel-integrated carbon sandwich electrodes.•Sandwich electrodes consisted of a suspended mesh and a substrate-bound electrode.•Microchannel-integrated sandwich electrodes exhibited high redox cycling efficiency.•Sensitivity enhancement due to confined mass transfer in a microchannel.•Selective detection of reversible target analytes was enabled in a microchannel.