3 research outputs found
Additional file 1 of Increasing ratio of opportunistic infections associated with sunshine exposure and economic level burdening Chinese inflammatory bowel disease hospitalized patients: the first nationwide survey from 2014 to 2019
Supplementary Material
Efficient Photoelectrochemical Hydrogen Generation from Water Using a Robust Photocathode Formed by CdTe QDs and Nickel Ion
Design of a novel sensitized NiO
photocathode with wide visible
light absorption and good stability is of great significance for photoelectrochemical
hydrogen evolution. Inspired by recent reports on novel photocatalytic
hydrogen evolution systems based on semiconductor quantum dots (QDs)
and earth-abundant inorganic metal ion, we demonstrate the fabrication
of an effective and stable photocathode by CdTe QDs and nickel ion.
This photocathode showed good activity and stability for photocatalytic
H<sub>2</sub> evolution (10.38 μmol) at a low overpotential
of 92 mV, in which the Faradaic efficiency was almost 100% under visible
light irradiation for 30 000 s. Characterized by X-ray photoelectron
spectroscopy, X-ray powder diffraction and high-resolution transmission
electron microscopy, the active site of photocathode in producing
hydrogen by water splitting was found to be NiS@QDs. Then a possible
mechanism of NiS@QDs for photoelectrochemical hydrogen evolution was
proposed
Light-Assisted Preparation of a ZnO/CdS Nanocomposite for Enhanced Photocatalytic H<sub>2</sub> Evolution: An Insight into Importance of in Situ Generated ZnS
In our work, ZnO/CdS hybrid photocatalysts
were prepared by a simple
and reproducible photodeposition method and the content of deposited
CdS can be varied by irradiation time. The ZnO/CdS photocatalysts
showed good photocatalytic H<sub>2</sub> evolution activities in aqueous
Na<sub>2</sub>S + Na<sub>2</sub>SO<sub>3</sub> solution. When the
content of CdS loading increased to 22.91% after an irradiation time
of 120 min (ZnO/CdS-T120), the highest photocatalytic activity was
obtained (1725 μmol g<sup>–1</sup> h<sup>–1</sup>), which was about 9.2 and 34.5 times than that of single ZnO and
CdS photocatalysts. At the same time, ZnO/CdS-T120 presented stable
photocatalytic ability (no noticeable degradation of H<sub>2</sub> evolution in four repeated runs in 48 h). Compared with other reported
H<sub>2</sub> evolution photocatalysts, ZnO/CdS-T120 showed higher
H<sub>2</sub> evolution activity and stability. Additionally, ZnO/CdS-T120
has a good natural sunlight driven H<sub>2</sub> evolution ability
(2077 μmol g<sup>–1</sup> h<sup>–1</sup>). ZnS
was proved to generate on ZnO/CdS-T120 surface in process of photocatalytic
H<sub>2</sub> evolution based on structural analyses of recycle ZnO/CdS-T120.
The formation of ZnS enhanced the photocatalytic H<sub>2</sub> evolution
activity of ZnO/CdS and extended the visible light adsorption region.
Meanwhile, the generation of ZnS increased the transfer interfaces
for photogenerated charge carriers and consequently promoted the separation
of photogenerated electrons and holes