Abstract
The construction of highly efficient, low-cost and noble-metal-free photocatalysts depends on photocatalytic technology. Recently, N-rich C3N5 has been explored as a novel carbon nitride material with a much narrower band gap (~2.2 eV) than that of traditional C3N4 (~2.7 eV). Planting noble-metal-free active sites on C3N5 to improve its photocatalytic activity is of great significance. Herein, 2D NixSy nanosheet is facially loaded on 2D C3N5 using a hydrothermal procedure under a low temperature. Due to the quick separation of photogenerated carries between C3N5 and NixSy, this inexpensive noble-metal-free NixSy-C3N5 hybrid nanosheet is highly efficient and stable as a multifunctional catalyst in various applications, including photocatalytic H2 production from water and NO removal. Impressively, the apparent quantum yield (AQY) value for H2 production reaches 37.0% (at 420 nm) on optimal NixSy-C3N5 hybrids, which is much higher than that of Pt-C3N5 material. This work opens an avenue to the fabrication of low-cost and noble-metal-free catalysts for multifunctional photocatalytic applications.
Highlights
Previous research has shown that the aforementioned three factors cannot be fully satisfied in one semiconductor, and the construction of hybrid materials, such as a design co-catalyst or active sites on semiconductors and semiconductor-based heterojunctions, is an effective strategy to combine the advantages of different materials to enhance photocatalytic efficiency [3,8,9,10,11,12,13]
Nix Sy material, indicating its high crystallinity, and the Nix Sy material prepared under hydrothermal conditions at 120 ◦ C primarily contains NiS (PDF card of 65–3419), while some weak peaks corresponding to Ni3 S4 (PDF card of 47–1739) can be seen
This result demonstrates that the prepared Nix Sy is composed of NiS and Ni3 S4, with NiS as the main component
Summary
Semiconductor-based photocatalytic technology is one of the most promising strategies for solving the ever-increasing energy crisis and addressing environmental pollution as well as concerns for public health [1,2,3,4]. Previous research has shown that the aforementioned three factors cannot be fully satisfied in one semiconductor, and the construction of hybrid materials, such as a design co-catalyst or active sites on semiconductors and semiconductor-based heterojunctions, is an effective strategy to combine the advantages of different materials to enhance photocatalytic efficiency [3,8,9,10,11,12,13]. The design of robust hybrid materials is an essential element in the photocatalytic field
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