Solar hydrogen generation using SO-CdS via photo reforming is studied in the presence of solar irradiation for six hours. For comparison purposes, solar hydrogen production in the presence of pristine CdS and Chl-CdS (in the absence of carbonaceous content of SO) via photocatalytic water splitting is also studied. The details of the photo-reactor used for photocatalytic hydrogen generation are given elsewhere . A remarkable enhancement (~5 times) of the photocatalytic activity (mmol H2 gcat -1 h -1 ) over a period of six hours is observed using SO-CdS system (with varying composition 1-10 wt. % of Spinacia oleracea) in place of pristine CdS (Figure ). The best performance is achieved at an optimum 5% composition of Spinacia oleracea; beyond the optimum, activity decays slightly due to an increase in the amount of carbon surface, which shades over the CdS nanorods (Fig ). Figure -II and III compare the cumulative hydrogen evolution (mmol) and photocatalytic activity respectively, for different photocatalytic systems of 5% SO-CdS, Chl-CdS and pristine CdS. The Chl-CdS photocatalyst enhances the hydrogen evolution through water splitting (in the absence of carbonaceous biomass) due to photosensitization of chlorophyll and exhibits almost 1.5 times higher photocatalytic activity compared to pristine CdS(~ 5 mmol g -1 h -1 ). SO-CdS (Chlorophyll-carbonaceous biomass-CdS) system generates hydrogen, with the irradiation time, with an average hydrogen evolution rate of ~1.5 mmol h -1 and photocatalytic activity ~29.68 mmol g -1 h -1 (~6 times enhancement w.r.t. CdS and ~3.7 times w.r.t. Chl-CdS) in the full band spectrum. The results imply the significant role of the oxidation of biomass in the enhancement of hydrogen generation. Using a 420 nm band pass filter, a small drop in evolution rate and activity (~11.3 mmol g -1 h -1 ) and an apparent quantum efficiency of 14.3% is achieved. As a result, the photocatalytic activity increased to 29.80 mmol h -1 g -1 (Figure -III).