Highly Efficient Photoelectrocatalytic Decomposition of Biomass Compounds Using a Nanoporous Semiconductor Photoanode and an O₂-Reducing Cathode with Quantum Efficiency Over 100

UV light-activated highly efficient photoelectrocatalytic decomposition of biorelated compounds and biowastes was successfully achieved by a Biophotochemical Cell (BPCC) comprising a nanoporous semiconductor film photoanode and an O₂-reducing cathode with high internal quantum efficiency over 100. Major decomposition reaction was dark auto-oxidation of the activated substrate radicals (R[round bullet, filled]) by the bulk O₂ into CO₂ or/and to N₂. Photocatalytic decomposition of aqueous solutions of urea, ammonia, pig urine, and oxalic acid was investigated. Combination cells were fabricated comprising a photoanode/cathode unit for activation of organic compounds and a large volume chamber for autooxidation of activated substrates.