Search query: Cd0.5Zn0.5S, Photocatalytic hydrogen production, visible light

Related papers:

abstract: Semiconductor based nanocomposites are quite promising in the areas of photocatalysis and photovoltaics due to their efficient charge separation. Herein, we demonstrated a simple and green one step method to prepare novel Cd0.5Zn0.5S/TNTs (titanate nanotubes) nanocomposites with low priced metallic elements. Transmission electron microscopy (TEM) images revealed that an enwrapped architecture was achieved for Cd0.5Zn0.5S/TNTs nanocomposites. Cd0.5Zn0.5S nanoparticles of ca. 90 nm were tightly surrounded by the network of titanate nanotubes, which led to the high dispersity of Cd0.5Zn0.5S nanoparticles and the intimate multipoint contacts between Cd0.5Zn0.5S and TNTs. Highly efficient charge separation was finally achieved in the hybrid Cd0.5Zn0.5S/TNTs through the enwrapped structure. Under visible light irradiation Cd0.5Zn0.5S/TNTs displayed improved activities compared to the single Cd0.5Zn0.5S for hydrogen evolution. The effect of sacrificial reagents on the photocatalytic activity of Cd0.5Zn0.5S/TNTs was discussed. The highest apparent quantum yield of 38.1% at 420 nm was achieved. This value is among the highest efficiencies for the noble metal free photocatalysts ever reported. Meanwhile, Cd0.5Zn0.5S/TNTs showed good stability for hydrogen production, and the content of toxic cadmium was as low as 4.0 wt% of the nanocomposites. These factors are of great significance for their application in the field of solar energy conversion.
author_names: Yubin Chen

Liejin Guo
title: Highly efficient visible light driven photocatalytic hydrogen production from water using Cd0.5Zn0.5S/TNTs (titanate nanotubes) nanocomposites without noble metals
year: 2012

abstract: In this work, a series of samples of Cd0.5Zn0.5S (ZCS) nanoparticles decorated with porous TaON were successfully prepared as a direct Z scheme system. The photocatalytic evolution of H2 with a high efficiency was explored using NiS decorated with TaON sensitized ZCS nanocomposites (NiS TaON/ZCS) and Na2SO3/Na2S as sacrificial reagents. The results showed that 0.5 wt% NiS deposited on the surface of 4 wt% TaON ZCS nanocomposites could reach the highest photocatalytic H2 evolution rate of 34.8 mmol h 1 g 1 with a maximum quantum yield of about 25.5% under 420 nm monochromatic light. The activity of the TaON ZCS photocatalyst for photocatalytic H2 evolution is higher than that of either pure ZCS or TaON. This high photocatalytic performance is ascribed firstly to the hierarchical structure of the coupled semiconductor system and secondly to the efficient transfer and separation of photogenerated charge carriers with NiS as a cocatalyst, which could serve as an electron collector.
author_names: Tingting Wei

Zhanbin Jin

Fengyan Li

Dandan Yan

Li-wen Xu
title: Efficient visible light driven photocatalytic hydrogen production over a direct Z scheme system of TaON/Cd0.5Zn0.5S with a NiS cocatalyst.
venue: Photochemical photobiological sciences Official journal of the European Photochemistry Association and the European Society for Photobiology
year: 2019

author_names: Khakemin Khan

Xiaoping Tao

Ming Shi

Bin Zeng

Zhaochi Feng

Can Li

Rengui Li
title: Visible Light Driven Photocatalytic Hydrogen Production on Cd 0.5 Zn 0.5 S Nanorods with an Apparent Quantum Efficiency Exceeding 80%
year: 2020

abstract: Abstract Constructing heterostructure for efficient charge separation is a hopeful way for enhance photocatalytic hydrogen production. In this paper, we successfully construct the Ni2P/Cd0.5Zn0.5S/Co3O4 (Ni2P/CZS/Co3O4) heterostructure via three step hydrothermal method. It is demonstrated that Ni2P/CZS/Co3O4 shows a prominent photocatalytic H2 generation activity of 39.66 mmol g 1 h 1, revealing about 2.42 times enhancement compared to that of the pure Cd0.5Zn0.5S (CZS) under visible light. The closely contacted CZS/Co3O4 forms a type II heterostructure to accelerate the separation of photoinduced charge. The Ni2P acts as electron traps to capture the photoelectrons, and provide active sites for proton reduction. Moreover, the cooperative synergy of type II heterostructure and active sites achieves an obvious improvement for photocatalytic hydrogen production.
author_names: Tianpeng Yu

Zihan Li

Zunhang Lv

Xin Liu

Guixue Wang

Guangwen Xie

Luhua Jiang
title: Constructing Ni2P/Cd0.5Zn0.5S/Co3O4 ternary heterostructure for high efficient photocatalytic hydrogen production
year: 2020

abstract: A novel ternary heterojunction Cd0.5Zn0.5S@UIO 66@g C3N4 (Cd0.5Zn0.5S@UCN) has been prepared by the in situ hydrothermal and precipitation approach, which exhibits superior photocatalytic activity for H2 generation and MO degradation under visible light irradiation. The Cd0.5Zn0.5S@UCN30 composite shows the maximum photocatalytic H2 production rate (1281.1 mmol h 1 g 1) that is about 32.9 and 2.7 times higher than UIO 66@g C3N4 and pristine Cd0.5Zn0.5S, respectively. Besides, the Cd0.5Zn0.5S@UCN30 heterojunction indicates the superior degradation efficiency of MO (82% in 120 min. The improved photocatalytic activity of the Cd0.5Zn0.5S@UCN heterostructure can be assigned to its large surface area, enhanced visible light absorption ability and high efficiency separation of photogenerated electron hole pairs, which are proved by the results of photocurrent and EIS analyses. Moreover, the photocatalytic mechanism based on the ternary heterojunction Cd0.5Zn0.5S@UCN is discussed and the transfer and separation process of photogenerated electron hole pairs is also proposed. This work demonstrates that a novel ternary noble metal free photocatalytic system could provide a scientific basis for the application in the field of energy production and pollution removal.
author_names: Qian Liang

Jie Jin

Changhai Liu

Song Xu

Chao Yao

Zhongyu Li
title: Fabrication of the ternary heterojunction Cd0.5Zn0.5S@UIO 66@g C3N4 for enhanced visible light photocatalytic hydrogen evolution and degradation of organic pollutants
year: 2018

abstract: Abstract Establishing efficient co catalytic loaded semiconductors for efficient charge separation is a hopeful way for enhance photocatalytic water splitting hydrogen evolution. Herein, we successfully constructed the Cd0.5Zn0.5S/Ni2P (CZS/Ni2P) nanocomposites via two step hydrothermal method. The CZS/Ni2P composites show much improved activity than the origin CZS for photocatalytic H2 generation. When the content of Ni2P loaded on the Cd0.5Zn0.5S (CZS) is 0.3 mol% the photocatalyst achieves the highest photocatalytic hydrogen generation rate of 41.26 mmol g 1 h 1 under visible light. The Ni S bonds on the close contact interface between CZS and Ni2P can be act as electron bridge to provide a channel for electron transfer. During the photocatalysis processing, Ni2P can be used as electron traps to attract electrons from CZS, resulting in the improvement of the photocatalytic performance.
author_names: Tianpeng Yu

Yingying Si

Zunhang Lv

Kaihang Wang

Qiang Zhang

Xin Liu

Guixue Wang

Guangwen Xie

Luhua Jiang
title: Cd0.5Zn0.5S/Ni2P noble metal free photocatalyst for high efficient photocatalytic hydrogen production: Ni2P boosting separation of photocarriers
year: 2019

abstract: Abstract Controlling the behavior of charge transfer is central to semiconductor based photocatalytic reactions. While a myriad of methods have been developed, successful approaches towards enhanced activity and stability but low cost have been elusive. Herein, we report a robust two step solvothermal method for the synthesis of a novel Cd 0.5 Zn 0.5 S/g C 3 N 4 composite. The composite possesses a type II staggered band alignment and intimately contacted interfaces, directing the rapid charge separation upon visible light irradiation and thus a remarkable enhancement of the photocatalytic efficiency. Comparing to pure Cd 0.5 Zn 0.5 S, the initial hydrogen production rate was improved from 13.6 mL/h to 20.8 mL/h without any co catalyst loading, companied with a high apparent quantum efficiency of 37% at 425 nm. Significantly, photoexcited holes on Cd 0.5 Zn 0.5 S transferred to photocorrosion resisted g C 3 N 4 leading to a more stable photocatalytic performance. The photocatalytic activity was kept over 95% in a three circle hydrogen production test. Our work thus offers a promising route to the low cost fabrication of novel photocatalyst in terms of both superior photoreactivity and stability.
author_names: Xixi Wang

Jie Chen

Xiangjiu Guan

Liejin Guo
title: Enhanced efficiency and stability for visible light driven water splitting hydrogen production over Cd0.5Zn0.5S/g C3N4 composite photocatalyst
year: 2015

abstract: Abstract The hierarchical AuNPs/Cd0.5Zn0.5S hybrids are directly fabricated via a facile one step in situ hydrothermal method. The as prepared AuNPs/Cd0.5Zn0.5S hybrids demonstrate superior photocatalytic performance toward hydrogen production under visible light irradiation. The hydrogen evolution rate of the 5 wt% AuNPs/Cd0.5Zn0.5S synthesized with in situ hydrothermal method can be 7.1 times greater than that of pure Cd0.5Zn0.5S and as much as 2.5 times of 5 wt% AuNPs loaded Cd0.5Zn0.5S synthesized with photodeposition method. Systematical investigations reveal that the enhanced photocatalytic performance of the one step in situ prepared AuNPs/Zn0.5Cd0.5S can be attributed to the inherent SPR effect and favorable electron transfer properties of AuNPs, as well as the rational hierarchical nanoarchitectures that allow AuNPs to be uniformly incorporated into Zn0.5Cd0.5S matrix. This one step in situ fabrication method provides a simple and efficient route to synthesize well defined heterocatalysts.
title: One step synthesis of hierarchical AuNPs/Cd0.5Zn0.5S nanoarchitectures and their application as an efficient photocatalyst for hydrogen production
venue: Journal of Industrial and Engineering Chemistry
year: 2019

abstract: Abstract A designed type II heterojunction photocatalyst, NiSe2/Cd0.5Zn0.5S (NiSe2/CZS) was successfully synthesized and it exhibits outstanding photocatalytic hydrogen evolution performance. The optimal loading amount of NiSe2 on Cd0.5Zn0.5S is 13 wt and the corresponding hydrogen production rate is approximately 121.01 mmol g 1 h 1 under visible light. The heterojunction structure between Cd0.5Zn0.5S and NiSe2 promoted the separation of photogenerated electron hole pairs, effectively suppressed the photogenerated carrier recombination and endowed the material with excellent interfacial charge transfer properties, thus improving the photocatalytic performance.
author_names: Xue Na Zhang

Zhiwei Cheng

Puhui Deng

Linping Zhang

Yuancheng Hou
title: NiSe2/Cd0.5Zn0.5S as a type II heterojunction photocatalyst for enhanced photocatalytic hydrogen evolution
year: 2021

abstract: Fabrication of a Z scheme photocatalytic system for hydrogen production and overall water splitting has huge potential in confronting the increasing worldwide energy crisis. But it is highly challenging to realize due to the harsh requirement for band edge levels and interfacial contact. Herein, we report the preparation of a high efficiency and stable Z scheme catalyst Cd0.5Zn0.5S BiVO4 with a core satellite structure through the charge induced assembly process in a mild water bath. A Cd0.5Zn0.5S BiVO4 Z scheme junction shows an enormously enhanced photocatalytic activity for H2 evolution under visible light illumination. The optimal photocatalytic H2 evolution rate reaches 2.35 mmol g 1 h 1, which is 7.13 times higher than that of Cd0.5Zn0.5S, and an appreciable apparent quantum efficiency of 24.1% at l 420 nm was achieved. In particular, without any sacrificial donor, the Cd0.5Zn0.5S BiVO4 Z scheme junction can overall split water into H2 and O2. The efficient photocatalytic activity of Cd0.5Zn0.5S BiVO4 is attributed to the formation of an intimate core satellite structure and a Z scheme photocatalytic mechanism, which not only greatly benefit the charge separation, but also prompt the photoinduced holes from Cd0.5Zn0.5S to rapidly recombine with the electrons of BiVO4, hence reserving the most favorable reductive and oxidative reaction sites. Meanwhile, it inhibits the photocorrosion of Cd0.5Zn0.5S, guaranteeing the high photochemical stability (no activity decay after half a year) This work provides a new reference for the fabrication of a high performance Z schematic photocatalyst for water splitting.
author_names: Chao Zeng

Ying-mo Hu

Tierui Zhang

Fan Dong

Yihe Zhang

Hong-wei Huang
title: A core satellite structured Z scheme catalyst Cd0.5Zn0.5S/BiVO4 for highly efficient and stable photocatalytic water splitting
year: 2018