Biomass extracted from brown macro-algae promises as a future renewable energy because of non-toxicity, natural availability, and greenhouse gas free and do not interfere with the human food chain. Here, we first show the extraction of energy from brown macro-algae by via direct oxidation of macro-algae biomasses by using the novel materials combination of gold nanoparticles (AuNPs), titania (TiO₂) and functionalized multi-walled carbon nanotubes (f-MWCNTs). The catalytic activity for macro-algae biomasses oxidation of composites materials was tested by both of cyclic voltammetry and chronoamperometry methods. In all experiments, TiO₂/Au/CNT nanocomposites exhibited better electrochemical performance than TiO₂/CNT composites; AuNPs/CNT composite or CNTs only. Enhanced current response can be attributed to the synergic effect of nano-TiO₂, nano-Au and f-MWCNTs. Furthermore, the new materials showed improvement on both direct fucose and alginate fuel cell performance. The results from this research open possibility for practical application of our fuel cell by using the cheap catalytic material of TiO₂ with high efficiency on conversion of energy from brown macroalgae biomass.