Temperature-assisted photochemical construction of CdS-based ordered porous films with photocatalytic activities on solution surfaces

Huang, Zhenxun; Sun, Fengqiang; Gu, Kaiyuan; Zou, Xueqiong; Huang, Yu‐Ying; Wu, Qianying; Zhang, Zihe

doi:10.1016/j.jcis.2011.01.027

Cited by 13 publications

(6 citation statements)

References 38 publications

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“…It may be in virtue of two factors. First, it maximizes the irradiation utilization . On one hand, the sheet on the bottom is further away from the immobilized light source, resulting in the self‐loss of the irradiation .…”

Section: Resultsmentioning

confidence: 99%

A Floating Sheet for Efficient Photocatalytic Water Splitting

Lin

Zheng

et al. 2016

Advanced Energy Materials

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effect of the upper catalysts. [ 6 ] The other one is the inconvenience originating from the intricate operations to extract the catalysts for recycling. Meanwhile powder loss may take place. [ 7 ] In order to overcome these weaknesses, we consider that photocatalysts may achieve more effi cient water splitting if they are integrated onto a substrate that can fl oat on water. [ 8 ] In this case, all the photocatalysts can absorb light energy effectively and the integrated sheet can be taken out from the water by a tweezer directly for recycling. Therefore, hydrophilic and low-mass carbon foam (CF) with 3D porous structure is selected as the fl oatable substrate. [ 9 ] Given that high carrier recombination rate is still a bottleneck of the photocatalytic technology, [ 10 ] the addition of a cocatalyst is regarded as a valid approach since the cocatalyst can act as a sink to trap the photoelectrons as well as active site for the reduction reaction. [ 11 ] Unfortunately, the state-of-theart cocatalysts are still noble metals (e.g., Pt, Au, Ru, or Pd) or their oxides that are rare and expensive. [ 12 ] Beyond them, cheap and effi cient cocatalysts have drawn more attention. Transition metal dichalcogenides (TMDs) have been more and more popular because of their fascinating physical and chemical properties. [ 13 ] The cocatalytic effect of molybdenum disulfi de (MoS 2 ) has been fully demonstrated already. [ 14 ] It was reported that tungsten-based TMDs possess better optical properties than molybdenum-based ones. [ 15 ] Moreover, an improved electrical conductivity and more active sites can be offered by selenium-based TMDs in electrocatalysis. [ 16 ] So tungsten diselenide (WSe 2 ) is expected to be a good cocatalyst. [ 17 ] Here, we demonstrate an effi cient solar photocatalytic water splitting using a fl oating sheet with a novel WSe 2 cocatalyst and nanodiamond-embedded Cu 2 O (NEC) photocatalyst. [ 18 ] This new-type artifi cial photocatalytic system makes full use of the incident light and avoids intricate operations in the recycling procedure. Meanwhile, the WSe 2 cocatalyst acts as an electron sink to promote electron-hole separation. Interestingly, this fl oating NEC/WSe 2 /CF structure achieves efficient water splitting upon simulated solar irradiation with an increased H 2 evolution rate, which is 13.2 times that of the powder-dispersing photocatalytic system. Overall, these fi ndings provide new ideas for the design of novel artifi cial photocatalytic systems.Solar photocatalytic water splitting has been a promising way to provide clean hydrogen energy. There are two weaknesses in the typical photo catalytic process in which photocatalysts are generally dispersing in water under stir. One is the inadequate utilization of light energy and the other one is the cumbersome operation in the recycling procedure. This study demonstrates an effi cient solar photocatalytic water splitting using a fl oating sheet with a novel WSe 2 cocatalyst. The sheet is fabricated by laser-depositing WSe 2 fi lm on a carbo...

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Section: Resultsmentioning

confidence: 99%

A Floating Sheet for Efficient Photocatalytic Water Splitting

Lin

Zheng

et al. 2016

Advanced Energy Materials

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“…These diffraction peaks of CdS and metallic cadmium are consistent with the previous report. 32 Obviously, upon further increase of the content of Na 2 S 2 O 3 •5H 2 O, the main diffraction peak positions of metallic cadmium decrease, indicating that it was probable that the content of metallic cadmium decreased with increasing amount of Na 2 S 2 O 3 •5H 2 O.…”

Section: Characterizationmentioning

confidence: 94%

“…On the basis of the above results, the probable mechanism for the formation of Cd/CdS photocatalysts has been reported. 31,32 The serial Cd/CdS photocatalysts were synthesized at room temperature using a solution composed of…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Photochemical preparation of Cd/CdS photocatalysts and their efficient photocatalytic hydrogen production under visible light irradiation

et al. 2014

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“…Both factors will lead to suppressed photocatalytic performances. While for the biphasic T/NF‐float system, under the solar irradiation, the surface converted heat by NF would be immediately transferred to the liquid phase and promotes water steam generation, boosting hydrogen evolution at the surface of TiO 2 catalyst attached to NF 22 . Figure S6 shows the water evaporation rates of powder system and T/NF‐float system.…”

Section: Resultsmentioning

confidence: 99%

“…While for the biphasic T/NF-float system, under the solar irradiation, the surface converted heat by NF would be immediately transferred to the liquid phase and promotes water steam generation, boosting hydrogen evolution at the surface of TiO 2 catalyst attached to NF. 22 Figure S6 shows the water evaporation rates of powder system and T/NF-float system. Clearly, a higher water evaporation rate of 0.56 kg m À2 was achieved over the T/NF-float system, owing to its photothermal effect.…”

Section: Photocatalytic H 2 Evolution Activity With or Without Magnet...mentioning

confidence: 99%

Decoupling gaseous hydrogen production from liquid water using a magnetic‐photo‐thermal coupling reactor

Wang

et al. 2022

AIChE Journal

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Taking monolithic TiO2/nickel foam as a model photocatalytic material, we hereby report the application of magnetic‐photo‐thermal coupling field toward enhanced solar photocatalytic hydrogen production. This enhancement is attributed to the increased temperature induced by eddy current effect and effective charge separation caused by the electric field force under the alternating magnetic field condition. Particularly, we demonstrate that a proper set of the position of the monolithic catalyst relative to the reaction solution, that is, at the water‐air interface, will lead to a further enhancement of the photocatalytic activity because of the improved mass transfer property of the reactants, with a hydrogen evolution rate of 104.3 μmol h−1. Specifically, the increased temperature of the catalyst leads to the rapid evaporation of water. Hydrogen generation is thus decoupled from liquid water, avoiding kinetically disfavored bubble formation. This work provides a novel strategy to facilitate photocatalytic performance with the application of external field.

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Temperature-assisted photochemical construction of CdS-based ordered porous films with photocatalytic activities on solution surfaces

Cited by 13 publications

References 38 publications

A Floating Sheet for Efficient Photocatalytic Water Splitting

A Floating Sheet for Efficient Photocatalytic Water Splitting

Photochemical preparation of Cd/CdS photocatalysts and their efficient photocatalytic hydrogen production under visible light irradiation

Decoupling gaseous hydrogen production from liquid water using a magnetic‐photo‐thermal coupling reactor

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