TiO2/SrTiO3/g-C3N4 ternary nanofibers with cascade charge transfer properties exhibited good hydrogen evolution and nitrogen fixation activities.

Organic metal halide perovskite material has attracted intense interest in the photovoltaic field due to its excellent optoelectronic properties, but the extreme susceptibility of organolead halide perovskite to water seriously impedes its application for photoelectrochemical (PEC) conversions in aqueous solution. In this work, we develop an organolead halide perovskite photoanode of conventional electrode structure. The perovskite photoanode was fabricated by using a facile approach and encapsulated with conductive carbon paste and silver conductive paint for waterproof function, and the PEC water splitting was carried out as a model of PEC conversion. For PEC water oxidation, the photoanode achieved a remarkable photocurrent density of 12.4 mA/cm 2 at 1.23 V versus reversible hydrogen electrode in alkaline electrolyte. In addition, the as-prepared photoanode of conventional structure exhibited an unprecedented stability, which could be stable in alkaline electrolyte for more than 48 h. More importantly, the photoanode retained a steady-state response in a continuous operation for at least 12 h in electrolyte at a wide pH range. This work opens a promising avenue toward the practical application of organic metal halide perovskite-based photoelectrodes for efficient PEC conversions in aqueous solution.

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Flexible photocatalysts stand out from numerous photocatalysts because of their foldable, reusable, and mechanically stable properties. Here, g-C 3 N 4 /Ag 3 PO 4 /PAN nanofibers were prepared by immobilizing Ag 3 PO 4 nanoparticles on electrospun g-C 3 N 4 /PAN nanofibers through the room-temperature in situ synthesis method. Compared with g-C 3 N 4 /PAN and Ag 3 PO 4 /PAN, the g-C 3 N 4 /Ag 3 PO 4 / PAN nanofibers exhibited better photocatalytic performance. The degradation rates of Rhodamine B and tetracycline hydrochloride of g-C 3 N 4 /Ag 3 PO 4 /PAN nanofibers were 8.8 and 12.9 times higher than those of g-C 3 N 4 /PAN nanofibers, while 3.1 and 6.5 times higher than those of Ag 3 PO 4 /PAN nanofibers, respectively. In addition, the oxygen evolution rate of g-C 3 N 4 /Ag 3 PO 4 /PAN nanofibers was 1.9 times better than that of g-C 3 N 4 /PAN and 5.8 times better than that of Ag 3 PO 4 /PAN. The improved photocatalytic performance of g-C 3 N 4 /Ag 3 PO 4 /PAN was likely because of the existence of Zscheme g-C 3 N 4 /Ag 3 PO 4 heterojunction with efficient charge separation. Furthermore, g-C 3 N 4 /Ag 3 PO 4 /PAN nanofibers had a better photochemical stability than Ag 3 PO 4 /PAN, which was probably due to the inhibited of Ag 3 PO 4 photocorrosion by the transfer of electrons from Ag 3 PO 4 to g-C 3 N 4 . These photocatalysts could be easily separated and reused due to their extra long nanofibrous mat structures and flexible properties. This work provided a new road to design and fabricate flexible selfsupporting photocatalysts for pollutants degradation and energy conversion. KEYWORDS: g-C 3 N 4 /Ag 3 PO 4 heterojunction, nanofibers, flexible photocatalysts, pollutant degradation, oxygen evolution