Dye Modification Effects on TaON for Photocatalytic Hydrogen Production from Water

Abstract

Modification effects of porphyrin dyes on the photocatalytic activity of tantalum (oxy)nitride (TaON) were investigated. The nitrogen content in tantalum (oxy)nitride was increased by increasing the heat treatment period. The optimized nitridation conditions were found to be calcination at 800 °C for 14 h under a NH 3 gas flow (25 mL min −1). Among the porphyrin dyes examined, pentamethylene bis [4-(10,15,20-triphenylporphine-5-yl) benzoate]-dizinc (II) (Zn-TPPD) showed the most positive effect on the photocatalytic activity of TaON for H 2 production from Na 2 S aqueous solution. From the results of the photocatalytic reaction using various combinations of catalyst components, it was found that the modification dye and PtO x co-catalysts were necessary to achieving photocatalytic H 2 formation. In the PtO x /Zn-TPPD/TaON photocatalyst, the expected charge transfer mechanism was a two-step excitation of both TaON and Zn-TPPD, and the oxidation and reduction sites were TaON and PtO x co-catalyst, respectively. These results indicate that dye modification has the potential to improve the photocatalytic activity of various (oxy)nitride photocatalysts.

Improved Interfacial and Electrical Properties of Ge-Based Metal-Oxide-Semiconductor Capacitor With LaTaON Passivation Layer

“…1(b). The spin-orbit splitting energy is ∼11.24 eV, thus indicating the presence of Ta +5 from Ta 2 O 5 /TaON [14].…”

Synthesis of tantalum oxynitride with enhanced visible light efficiency in photoreduction of carbon dioxide

“…As compared with Ta 2 O 5 , the TaON has N1s peak was observed at 396.6 eV which can be attributed to TaON. [14] All of the above results clearly demonstrate that TaON material was successfully fabricated by nitriding Ta 2 O 5 .…”

Z-scheme photocatalyst based on porphyrin derivative decorated few-layer BiVO4 nanosheets for efficient visible-light-driven overall water splitting

“…After continuously stirring for 72 h, a rotary evaporation process was used to obtain the BVNS/CrmTPP with 20 μmol•g −1 of CrmTPP loading. PtOx co-catalyst was loaded on the BVNS/CrmTPP by a impregnation process in a Pt(NH3)4(NO3)2 solution [24]. Typically, BVNS/CrmTPP (0.20 g) was dispersed in water (40 mL) containing Pt(NH3)4(NO3)2 (4.0 mg).…”

“…Moreover, the substitutions of four meso-or eight β-positions of porphyrin can finely tune the physicochemical and electrochemical properties, and thus easily constructs oriented electron transfer pathway in a dye-sensitized system [20][21][22][23]. In addition, certain porphyrin derivatives were used as electron acceptor to construct artificial photosynthetic photocatalysts [24][25][26][27][28]. For example, a ternary TCPP/rGO/ Bi2WO6 Z-scheme heterojunction exhibited visible-light-driven activity due to the effective charge separation by using Bi2WO6 and TCPP as the hole-rich and electron-rich reservoir [27], respectively.…”