Advances in designing heterojunction photocatalytic materials

Promising strategies are of great significance for designing photoelectrodes with high charge separation efficiency and low charge recombination rate in photoelectrochemical (PEC) water splitting. In this paper, we firstly propose a method of combining piezoelectric effect with photoelectrochemical cell by utilizing of direct band gap metal-oxide semiconductor ZnO as the photoanode. After introducing piezoelectric effect resulted from ultrasonic vibrations, the current density value reaches 0.45 mA·cm−2 at 1.23 VRHE by the production of strain-induced charge and the enhancement of the electric field, 1.7 times higher than that of ZnO without ultrasonic vibrations (0.27 mA·cm−2 at 1.23 VRHE). The deposition of spatially separated dual cocatalysts, of which the bottom Pt act as electron collection and transport layer while the outmost Co-Pi serve as hole-transfer layer, further facilitates the separation of charge (strain-induced and photogenerated) and accelerates the reaction kinetics. The utilization of dual cocatalysts efficiently improves the performance of photoanodes and leads to a current density of 0.80 mA·cm−2 at 1.23 VRHE, 1.8 and 3.0 times higher than the values of ZnO with and without ultrasonic vibrations. The strategy provides a promising method and idea for the manufacture of practical and high-performance electrodes.

Enhanced piezoelectric-effect-assisted photoelectrochemical performance in ZnO modified with dual cocatalysts

Decorating Cu2O photocathode with noble-metal-free Al and NiS cocatalysts for efficient photoelectrochemical water splitting by light harvesting management and charge separation design

Charge separation and transport as well as light absorption are pivotal in determining the efficiency of solar water splitting devices. Herein, we have designed a novel edamame shaped ZnIn2S4 nanostructures consisted of hybridized nanoflakes (2D) and nanoparticles (0D) on ITO conductive substrate through a simple hydrothermal method for PEC water splitting for the first time. The growth mechanism of 0D/2D ZnIn2S4 is proposed and discussed in detail. The series of PEC measurements indicate that edamame shaped 0D/2D ZnIn2S4 films exhibit relatively higher PEC activity (0.37 mA/cm2 at 1.23 V vs. RHE) than that of ZnIn2S4 NFs and ZnIn2S4 NPs due to the enhanced light absorption and efficient charge separation and transfer and increased active sites. Additionally, after selectively depositing Co-Pi cocatalyst and Pt NPs on the top and bottom sides of edamame shaped ZnIn2S4 photoanodes, charge recombination at the surface and interface can be efficiently reduced. The spatial Co-Pi cocatalyst drives holes to flow to the surface, while the Pt NPs facilitate the electrons in the opposite directions. Thus, the integrated Co-Pi/ZnIn2S4/Pt equipment without any additional doping presents an increased photocurrent density with 0.91 mA/cm2 at 1.23 V vs. RHE. This work highlights that edamame shaped ZnIn2S4 can be a promising candidate for photoelectrochemical behavior and rout such as coupling of Co-Pi and Pt co-catalysts on photoanodes have an interfacial electric field can provide a new avenues to design efficient PEC devices in future.

Hybrid 0D/2D edamame shaped ZnIn2S4 photoanode modified by Co-Pi and Pt for charge management towards efficient photoelectrochemical water splitting

Preparation of BiOCl0.9I0.1/β-Bi2O3 composite for degradation of tetracycline hydrochloride under simulated sunlight

In-situ synthesis of novel p-n heterojunction of Ag2CrO4-Bi2Sn2O7 hybrids for visible-light-driven photocatalysis

Ag2WO4 is a typically noble metal based photocatalyst with highly efficient photocatalytic activity. However, due to photocorrosion, the pristine Ag2WO4 is prone to inactivation during illumination. Constructing composite photocatalyst may be a useful method to promote the stability of Ag2WO4. In this work, Ag2WO4/graphitic carbon nitride nanotubes (g-C3N4 NTs) composite photocatalyst was prepared by adopting an in-situ composite strategy. The photocatalytic performance of the samples was discussed by the degradation of rhodamine B under visible light, and the catalytic mechanism was also analyzed. The characterization results show that the photocatalytic efficiency of the as-prepared Ag2WO4/g-C3N4 NTs composite increases firstly and then decreases along with the increase of the Ag2WO4 content. When the theoretical molar ratio of Ag2WO4:g-C3N4 NTs reaches 3:2, the photocatalytic degradation efficiency achieves the optimal value, that is 92.4% within 20 min, which obviously exceeds 2.8% of pure Ag2WO4 and 48.9% of pure g-C3N4 NTs. Moreover, the separation and migration efficiency of photoelectron–hole pairs of the composites can be accelerated in comparison with pure samples. In addition, superoxide radicals and hydroxyl radicals play major roles in the photocatalytic degradation process.

Study on Ag 2 WO 4 /g-C 3 N 4 Nanotubes as an Efficient Photocatalyst for Degradation of Rhodamine B

Visible and near-infrared light responsed Sn1−x Bi x S2nanosheets was synthesised via a simple hydrothermal method. Rhodamine B was adopted to evaluate the degradation efficiency of the as-prepared samples. Experimental results showed that the doping content of Bi3+ could obviously affect the degradation efficiency of SnS2. It was first increased and then decreased with increasing the Bi3+ content under the visible light irradiation. When the mole fraction of doping Bi3+ was 5%, the as-prepared Sn0.95Bi0.05S2 with a bandgap of 0.38 eV had the highest degradation efficiency of 95.9% in 120 min. Moreover, the as-prepared composites possessed more effective electron–hole pair separation than that of pure SnS2. In addition, a possible degradation mechanism of the as-prepared Sn0.95Bi0.05S2 was proposed.

https://ietresearch.onlinelibrary.wiley.com/doi/pdf/10.1049/mnl.2017.0727

Synthesis of visible and near-infrared light responsed Sn1−x Bi x S2 for efficient degradation of high concentration rhodamine B

SnO2/AgIO4 hybrids were fabricated by an in-situ synthetic method at room temperature. The structure, morphology, light response range, separation efficiency of the electron-hole pairs and elements of the as-synthesized samples were characterized by adopting X-ray diffraction, scanning electron microscopy, UV-Vis diffuse reflectance spectroscopy, electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy, respectively. The synergistically photocatalytic degradation mechanism of the as-synthesized composites was also proposed. The experimental results reveal that under the visible light irradiation the as-synthesized SnO2/AgIO4 hybrids can enhance the photocatalytic degradation efficiency of rhodamine B compared to pure samples. With increasing the molar ratios of AgIO4 to SnO2, it displays the trend of first increasing and then decreasing. When it is 1:2 in 150 min, the as-prepared hybrids have the highest degradation efficiency of 93.1%, which increases by 6550.0%, 30.5%, and 1505.0% compared to those of pure SnO2, AgIO4, and TiO2 (P25), respectively. Moreover, the Sn-O-Ag cross-linking bonds are formed at the interfaces of SnO2 and AgIO4. In addition, superoxide anion radicals and holes play a major role in the process of photodegradation.

Chemical-bonds Conjugated SnO2/AgIO4 Hybrids for Degradation of High Concentration Rhodamin B under Visible Light Illumination

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Papers

In-situ synthesis of novel p-n heterojunction of Ag2CrO4-Bi2Sn2O7 hybrids for visible-light-driven photocatalysis

Study on Ag 2 WO 4 /g-C 3 N 4 Nanotubes as an Efficient Photocatalyst for Degradation of Rhodamine B

Synthesis of visible and near-infrared light responsed Sn1−x Bi x S2 for efficient degradation of high concentration rhodamine B

Chemical-bonds Conjugated SnO2/AgIO4 Hybrids for Degradation of High Concentration Rhodamin B under Visible Light Illumination