A membrane-less visible-light responsive micro photocatalytic fuel cell with the laterally-arranged CdS/ZnS-TiO2 photoanode and air-breathing CuO photocathode for simultaneous wastewater treatment and electricity generation

Visible-Light Activated Titania and Its Application to Photoelectrocatalytic Hydrogen Peroxide Production

“…For this reason, they do not form separate layers, but they are detected inside the titania mesostructure. This is known from previous works [7,8,15,17,35,36], but can be also verified by the following FESEM images shown in Figure 3. Figure 3A shows a characteristic image of nanoparticulate Titania P25.…”

“…Its only disadvantage is that its light absorption is limited in the UV. For this reason and in order to expand its light absorption range, titania has been combined with visible-light-absorbing sensitizers [5][6][7][8][9][10][11][12][13][14][15][16][17]. Dyes as well as organometal halide perovskites have been very successful as sensitizers of titania, but their functionality is limited to specific organic or solid-state environments exclusively applied to solar cells [5,6].…”

“…Dyes as well as organometal halide perovskites have been very successful as sensitizers of titania, but their functionality is limited to specific organic or solid-state environments exclusively applied to solar cells [5,6]. In aqueous environments, only inorganic sensitizers have offered acceptable performance, and among those, only a few II-VI semiconductors have led to interesting scenarios [7][8][9][10][11][12][13][14][15][16][17]. Indeed, sensitization of mesoporous titania by nanoparticulate CdS and CdSe has been repeatedly studied, righteously offering efficient sensitization and application in a variety of photocatalytic and photoelectrocatalytic systems [7][8][9][10][11][12][13][14][15][16][17].…”

“…In aqueous environments, only inorganic sensitizers have offered acceptable performance, and among those, only a few II-VI semiconductors have led to interesting scenarios [7][8][9][10][11][12][13][14][15][16][17]. Indeed, sensitization of mesoporous titania by nanoparticulate CdS and CdSe has been repeatedly studied, righteously offering efficient sensitization and application in a variety of photocatalytic and photoelectrocatalytic systems [7][8][9][10][11][12][13][14][15][16][17]. Furthermore, formation of nanoparticulate metal sulfides within the titania mesoporous structure is very easy and necessitates only "soft" chemistry techniques.…”

Use of Chalcogenide-Semiconductor-Sensitized Titania to Directly Charge a Vanadium Redox Battery

“…PFC is a fuel cell which is based on the photocatalytic oxidation of a sacrificial agent at the photoanode and the reduction of dioxygen at the cathode electrode. PFC then is a photoelectrochemical cell which consists of two electrodes; one anode and one cathode, in contact with an electrolyte [1][2][3][4][5][6][7][8][9][10][11]. The (photo)anode carries a semiconductor photocatalyst.…”