The chemical and electrochemical performance of a microfluidic reactor for the cogeneration of nitrobenzene derivatives and electricity has been analysed. Reactor operation has been tested using loads of 100 Omega and 1000 Omega, allowing an in-depth characterisation replicating the circumstances of actual chemical production. Conversion rates of up to 64% and power densities of up to 0.299 mW cm(-2) have been attained. The main products obtained using this cogeneration co-laminar flow cell (CLFC) are aniline and nitrosobenzene. Nitrosobenzene is identified as a product generated by cogeneration while aniline is established to be an unwanted side-product at the anode due to oxidant crossover, which reduces the cogeneration efficiency. Reactor stability has been determined by monitoring of the anode, cathode and cell potentials. Self-poisoning of the anode reaction leads to loss in electrical performance. Due to its ability to self-regenerate, the power density shows an oscillating behaviour over time. Results in this paper reveal that the concept of a cogeneration microreactor is promising, although the anode reaction and the mass transfer in the reactor can still be optimised further for actual applications. (C) 2019 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.