Deliberate construction of direct <i>Z</i>-scheme photocatalysts through photodeposition

Jiang, Wenshuai; Qu, Dan; An, Li; Gao, Xiang; Wen, Yuanjing; Wang, Xiayan; Sun, Zaicheng

doi:10.1039/c9ta05607f

Cited by 94 publications

(48 citation statements)

References 45 publications

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“…Besides, the AEZAB also shows dominant performance advantages over the most predominant ZABs reported previ-ously, [16,32,[56][57][58][59][60][61][62] further verifying a suitable asymmetric electrolyte in ZAB can bring forth remarkable improvement in performance of the ZAB. It should be pointed out that the electrolyte in both chamber did show remarkable impaction on the battery performance.…”

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confidence: 87%

An Asymmetric‐Electrolyte Zn−Air Battery with Ultrahigh Power Density and Energy Density

et al. 2017

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ZnÀair batteries have attracted enormous research interest, driven by the promise for vehicle propulsion owing to their advantages of high-level safety, low cost, and high specific energy density. Here, we report an asymmetric-electrolyte ZnÀair battery with acid catholyte and alkaline anolyte separated by a bipolar membrane. We demonstrate that the asdesigned ZnÀair battery, thanks to the as-formed concentration cell, can deliver a maximum power density of 380 mW cm À2 and a specific energy density of 1522 Wh kg À1 with an open-circuit voltage of 2.25 V. The as-proposed ZnÀair battery performance is superior to the conventional ZnÀair battery in terms of these pivotal performance parameters.Energy crisis and environmental pollutions caused by the consumption of fossil fuels have stimulated great interests in developing renewable energy sources. Accordingly, a series of energy storage and conversion systems, such as rechargeable batteries, [1][2][3][4][5] fuel cells, [6][7][8][9] and capacitors, [10][11][12][13][14] have been developed successfully to fulfill application demands in diverse fields. Among them, Zn-air batteries powered by oxidizing zinc with oxygen have received intensive attentions due to their advantages of high theoretic energy density and specific capacity, low cost, and high efficiency. [15][16][17] In addition, the current yearly global zinc production is sufficient to produce enough Zn-air batteries, [18][19][20] which holds overwhelming advantages over the current limited production of lithium that is necessary source for the current dominant lithium ion batteries (LIBs). [21][22][23] Zn-air batteries are thus regarded as promising energy sources for the next generation electric vehicle battery and as a utility-scale energy storage system. [17,[24][25][26] However, the cell voltage for Zn-air batteries is theoretically capable 1.65 V and almost all practical devices are optimized for less than 1.4 or 1.3 V, less than half of that in LIBs. Moreover, the outputting energy density in the Zn-air batteries reported so far was less than theoretical estimates. For example, the peak power density and energy density are always behind 200 mW cm À2 and 1000 Wh kg À1 , respectively. In these regards, it is highly desirable to make further improvements in output voltage and energy density of Zn-air batteries. [17,[27][28][29] We here report a newly asymmetric-electrolyte Zn-air battery (AEZAB) with H 2 SO 4 as catholyte and NaOH as anolyte that are separated by a bipolar membrane (BPM), in which the commercial Pt/C is applied as the cathode catalyst to demonstrate such proof-of-concept. We demonstrate the as-designed Zn-air battery is capable of releasing an open circuit voltage of 2.25 V with a power density of 380 mW cm À2 , 1.90 times higher than that of the conventional ZAB and even beat that of the best ZAB ever reported. Moreover, the energy density of the AEZAB is as high as 1522 Wh kg À1 , 1.51 times higher than that of conventional ZAB, even far surpassing the theoretic energy density of ZAB. F...

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confidence: 87%

An Asymmetric‐Electrolyte Zn−Air Battery with Ultrahigh Power Density and Energy Density

et al. 2017

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“…[25] Upon visible light illumination, electron-hole pairs are photogenerated in both Bi 2 WO 6 and WO 3 . [26] The photoinduced electrons are excited from the VB to the CB in both photocatalysts. The excited electrons from the CB of WO 3 and the holes in the VB of Bi 2 WO 6 then migrate to the copper foil sheet which acts as an electron mediator, that facilitates the vectorial electron transfer from VB of WO 3 and CB of Bi 2 WO 6 , which leads to the accumulation of electrons in the CB of Bi 2 WO 6 and the holes in the VB of WO 3 .…”

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confidence: 99%

Fabrication of Bi₂WO₆/Cu/WO₃ All‐Solid‐State Z‐Scheme Composite Photocatalyst to Improve CO₂ Photoreduction under Visible Light Irradiation

et al. 2019

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Photocatalysis has been widely explored to alleviate the high atmospheric CO 2 content by converting CO 2 into energy-rich fuels. Bi 2 WO 6 shows great potential in photocatalysis due to its high chemical stability, non-toxicity and appropriate band position. However, the CH 4 yield from CO 2 photoreduction over bulk Bi 2 WO 6 is relatively low ascribed to its single-component structure. Inspired by natural photosynthesis, Z-scheme system with photosystem I (PS I)-photosystem II (PS II) coupling via an electron mediator can improve charge separation and at the same time, renders large overpotential, attributed to the vectorial electron transfer from PS II to PS I. In this contribution, an all-solid-state Z-scheme photocatalyst that is composed of 2D Bi 2 WO 6 nanosheets coupled with WO 3 along with the incorporation of copper foil sheet as the electron mediator is designed to improve the CO 2 reduction efficiency. The Bi 2 WO 6 / Cu/WO 3 composite demonstrated a remarkable CH 4 yield of 8.80 μmol g À 1 catalyst over 8 hours of visible light illumination, which is superior to the Bi 2 WO 6 standalone.[a] Y.

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“…The XPS spectrum of O 1s can be fitted by three peaks corresponding to VÀ OÀ V (530.1 eV), VÀ OH (531.2 eV) and C=O/CÀ O (533.0 eV), respectively (Figure 3(c)). [22,23] Two peaks of V 2p (517.2 and 524.7 eV) can be detected, which are the characteristics of V 5 (Figure 3d). [5] The XPS spectra further confirmed the successful synthesized of V 2 O 5 @G. Figure S3a shows the nitrogen adsorption-desorption isotherms for the V 2 O 5 @G and bulk V 2 O 5 .…”

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confidence: 99%

Fabrication Sandwich‐Like V₂O₅ Nanosheets Anchor in Graphene Towards High Energy Lithium Cathode Materials

Fan

Zhang

et al. 2018

Energy Tech

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The conventional cathode cannot meet the constantly increasing demand for high specific capacity in next generation cathode. V2O5 is an attractive cathode material due to its high theoretical specific capacity (294 mAh g−1) and affordable cost. Herein, we report a facile process for the fabrication of 2D sandwich‐like V2O5@Graphene nanosheets. Profiting from a synergic strategy inhibiting stacked layered structure and enhanced ion transport within interlayer, the sandwich‐like V2O5@Graphene composite exhibits exceptional high initial reversible capacity (300 mAh g−1 at the 0.5 C), excellent cyclic stability (203 mAh g−1 after 245 cycles) and high‐rate capability (165 mAh g−1 at the 10 C).

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Deliberate construction of direct Z-scheme photocatalysts through photodeposition

Abstract: Photodeposition can effectively regulate charge transfer sites and deposit the second semiconductor at a specific site to form a direct Z-scheme.

Cited by 94 publications

References 45 publications

An Asymmetric‐Electrolyte Zn−Air Battery with Ultrahigh Power Density and Energy Density

An Asymmetric‐Electrolyte Zn−Air Battery with Ultrahigh Power Density and Energy Density

Fabrication of Bi₂WO₆/Cu/WO₃ All‐Solid‐State Z‐Scheme Composite Photocatalyst to Improve CO₂ Photoreduction under Visible Light Irradiation

Fabrication Sandwich‐Like V₂O₅ Nanosheets Anchor in Graphene Towards High Energy Lithium Cathode Materials

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Deliberate construction of direct Z-scheme photocatalysts through photodeposition

Abstract: Photodeposition can effectively regulate charge transfer sites and deposit the second semiconductor at a specific site to form a direct Z-scheme.

Cited by 94 publications

References 45 publications

An Asymmetric‐Electrolyte Zn−Air Battery with Ultrahigh Power Density and Energy Density

An Asymmetric‐Electrolyte Zn−Air Battery with Ultrahigh Power Density and Energy Density

Fabrication of Bi2WO6/Cu/WO3 All‐Solid‐State Z‐Scheme Composite Photocatalyst to Improve CO2 Photoreduction under Visible Light Irradiation

Fabrication Sandwich‐Like V2O5 Nanosheets Anchor in Graphene Towards High Energy Lithium Cathode Materials

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Fabrication of Bi₂WO₆/Cu/WO₃ All‐Solid‐State Z‐Scheme Composite Photocatalyst to Improve CO₂ Photoreduction under Visible Light Irradiation

Fabrication Sandwich‐Like V₂O₅ Nanosheets Anchor in Graphene Towards High Energy Lithium Cathode Materials