The role of azo dye Reactive Black 5 (RB5) as an electron donor and/or electron acceptor could be distinguished in dual chamber of photocatalytic fuel cell (PFC). The introduction of RB5 in anode chamber increased the voltage generation in the system since degradation of RB5 might produce electrons which also would transfer through external circuit to the cathode chamber. The removal efficiency of RB5 with open and closed circuit was 8.5% and 13.6%, respectively and removal efficiency for open circuit was low due to the fact that recombination of electron-hole pairs might happen in anode chamber since without connection to the cathode, electron cannot be transferred. The degradation of RB5 in cathode chamber with absence of oxygen showed that electrons from anode chamber was accepted by dye molecules to break its azo bond. The presence of oxygen in cathode chamber would improve the oxygen reduction rate which occurred at Platinum-loaded carbon (Pt/C) cathode electrode. The V_oc, J_sc and P_max for different condition of ultrapure water at cathode chamber also affected their fill factor. The transportation of protons to cathode chamber through Nafion membrane could decrease the pH of ultrapure water in cathode chamber and undergo hydrogen evolution reaction in the absence of oxygen which then increased degradation rate of RB5 as well as its electricity generation.

偶氮染料活性黑5（RB5）作为电子给体和/或电子受体的作用可以在光催化燃料电池（PFC）的双室中得以区分。将RB5引入阳极室会增加系统中的电压生成，因为RB5的降解可能会产生电子，这些电子也将通过外部电路传输到阴极室。RB5在开路和闭路时的去除效率分别为8.5％和13.6％，并且开路的去除效率很低，这是由于以下事实：在阳极室中可能发生电子-空穴对的重组，因为没有连接到阴极，电子无法转让。在没有氧气的情况下，阴极室中RB5的降解表明，来自阳极室的电子被染料分子接受以破坏其偶氮键。阴极室中氧气的存在将提高在负载铂的碳（Pt / C）阴极电极上发生的氧气还原速率。V阴极腔室中超纯水不同条件下的_oc，J _sc和P _max也影响了它们的填充系数。质子通过Nafion膜传输到阴极室可以降低阴极室中超纯水的pH值，并在没有氧气的情况下发生氢释放反应，从而增加了RB5的降解率以及其发电量。