Halide perovskite like methylammonium lead iodide perovskite (MAPbI3) with its prominent optoelectronic properties has triggered substantial concerns in photocatalytic H2 evolution. In this work, to attain preferable photocatalytic performance, a MAPbI3/cobalt phosphide (CoP) hybrid heterojunction is constructed by a facile in situ photosynthesis approach. Systematic investigations reveal that the CoP nanoparticle can work as co‐catalyst to not only extract photogenerated electrons effectively from MAPbI3 to improve the photoinduced charge separation, but also facilitate the interfacial catalytic reaction. As a result, the as‐achieved MAPbI3/CoP hybrid displays a superior H2 evolution rate of 785.9 µmol h−1 g−1 in hydroiodic acid solution within 3 h, which is ≈8.0 times higher than that of pristine MAPbI3. Furthermore, the H2 evolution rate of MAPbI3/CoP hybrid can reach 2087.5 µmol h−1 g−1 when the photocatalytic reaction time reaches 27 h. This study employs a facile in situ photosynthesis strategy to deposit the metal phosphide co‐catalyst on halide perovskite nanocrystals to conduct photocatalytic H2 evolution reaction, which may stimulate the intensive investigation of perovskite/co‐catalyst hybrid systems for future photocatalytic applications.
Photocatalysis is a technique and one of the prospective solar-energy-conversion strategies for addressing the current energy and environmental problems. Developing a powerful photocatalyst is the key to achieving a supernal visiblelight-induced catalytic activity. Lead halide perovskites have been broadly utilized in photocatalysis with excellent performance; however, their practical applications and commercial values are extremely limited by intrinsic lead toxicity. Therefore, it is urgent and reasonable to substitute Pb with other harmless elements in halide perovskites, which has recently boomed as an attractive research field. The substitute candidates are Sn (same main group as Pb), Bi (same period as Pb), Sb, and other transition metal elements. In this review, we first give a systematic introduction to the structure and characteristics of nonlead halide perovskites. The following section provides a general description of the preparation methods and photocatalytic performance for nonlead halide perovskites. Finally, the prospects and challenges of nonlead halide perovskites in the photocatalytic field are discussed, which may facilitate and guide the future investigation of this exciting topic.
SSCN is a new type of self-sensitive photocatalyst. It consists of oxygenated carbon nitride-containing microspheres inside and polymerized triazine dye (TBO) formed on its surface by in situ polymerization. The presence of TBO endows SSCN with a wide range of optical responses. However, the TBO would self-degrade under light, making SSCN extremely unstable in photocatalytic reactions and limiting the practical application of SSCN. The introduction of phosphorus into the structure of SSCN significantly improved the electron–hole separation efficiency and reduced the self-degradation of surface TBO. Phosphorus-doped self-sensitive carbon nitride microspheres (P-SSCN) are easily synthesized by a one-pot solvothermal method—the phosphorus source was added to the precursor solution of SSCN. This resulting material was used for the photodegradation of tetracycline hydrochloride (TC-HCl) for the first time, giving improved visible light sensitivity and high stability in the photocatalytic process. This provides a new method for modifying self-sensitive carbon nitride carbon.
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