Previous work has shown that lignin valorisation can be coupled with hydrogen evolution or reduction of CO2 to formate using photoelectrochemical systems. In comparison, our work presents a unique and successful three-step approach that shows that complete valorisation of lignocellulose is possible through the combination of fractionation and utilisation of photocatalysis and electrocatalysis to oxide the resulting solid fraction to formate and liquid fraction to aromatics and reduce diluted CO2 and water to CO and H2. Although this system is a proof-of-concept demonstration, different factors would need consideration for practical implementation. These include scalability, integration of a carbon capture step, 47 potential limitations such as catalyst stability, the engineering design of reactors Product quantification. Gaseous H2 and CO under static conditions were analysed by an Agilent 7890A gas chromatograph equipped with an HP-5 molecular sieve column and a thermal conductivity detector using He as the carrier gas. The response factors for the gases were determined by calibration with known amounts of H2 and CO. Typically, 50 µL of headspace gas from the photoreactor was injected using an air-tight syringe (Hamilton, GASTIGHT). Formate was analysed by ion chromatography (IC) on a Metrohm 882 compact IC plus chromatography system equipped with a Metrosep A Supp 5 -150/4.0 column using an aqueous Na2CO3 (3.2 mM) and NaHCO3 (1 mM) solution as eluent. The response factor of formate was determined by calibration with known amounts of aqueous formate solutions.