Precise Formation of a Hollow Carbon Nitride Structure with a Janus Surface To Promote Water Splitting by Photoredox Catalysis

Zheng, Dandan; Cao, Xu-Ning; Wang, Xinchen

doi:10.1002/anie.201606102

Cited by 454 publications

(194 citation statements)

References 46 publications

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“…Moreover, double heterostructures based on C 3 N 4 have been proposed by Wang et al [108][109][110] to achieve the pure water splitting without sacrificial agents. Different from the previous discussed heterostructures, the double heterostructures are constructed by different co-catalysts on C 3 N 4 photocatalyst.…”

Section: −1mentioning

confidence: 99%

“…For instance, modified separately with Pt and Co 3 O 4 NPs on both surfaces of C 3 N 4 , the photocatalytic full water splitting was achieved. [110] It indicates that the Janus structure can promote surface redox reactions by separating incompatible oxidation and reduction. It is anticipated that this methodology will realize the goal of designing full water splitting photocatalytic process with a well-designed H 2 /O 2 separation system.…”

Section: −1mentioning

confidence: 99%

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Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Wang

Sang

et al. 2017

Advanced Energy Materials

242

116

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photocatalysis based on semiconductors represents another route for light energy conversion. This route endows the direct conversion of light energy into oxidation and reduction energy via charge carriers (electrons and holes) generated in the semiconductors. For instance, the photocatalytic degradation of harmful and toxic organic substances, dyes, and chemicals has been considered to be a suitable candidate for removing organic pollution from water, [5][6][7][8] where photooxidation dominates the degradation of the organic molecules. The full process of photocatalytic water splitting into H 2 and O 2 is believed to be promising for generating renewable and green energy, [9,10] and the process includes the photoreduction and photooxidation of water, respectively. The photocatalytic reduction of CO 2 can convert solar energy into chemical energy, stored as CH 4 , CO, CH 3 OH, etc. [11][12][13] These processes can help reduce the pressure of the global warming crisis and supply usable renewable energy. Due to the precise control of photocatalytic reduction and oxidation, photocatalytic molecular synthesis has also attracted much interest, which provides a sustainable pathway for green synthesis. [14][15][16] For an efficient photocatalytic process, solar light harvesting and a redox process based on photogenerated charge carriers are essential steps. Solar light harvesting consists of light absorption and charge carrier excitation steps, which can be expressed as the light utilization efficiency. The efficiency determines the total energy converted from solar light and is mostly determined by the band structure of the semiconductor applied to the photocatalytic process.The photocatalytic process has been extensively studied by examining the response of photocatalysts to UV light, due to its relatively high photonic energy. As is well known, UV light energy amounts to no more than 5% of the solar light energy. Visible light and near-infrared (NIR) light contain approximately 90% of the solar light energy. To utilize solar light in order to solve the environmental and energy crisis, visible light and NIR-light-activated photocatalysts are essential. For decades, many studies have focused on expanding the range over which a photocatalyst can utilize the solar light spectrum. In addition, there are several good reviews summarizing recent progress on UV-vis-light-activated photocatalysts, as well as strategies to improve the photocatalytic efficiency. [17][18][19][20] As is well known, the photonic energy of visible light is low, and that of NIR light is even lower. Photoinduced redox requires an initial amount of energy to activate the process; however, NIR photonic energy may be too low to realize photoinduced The realization of light-chemical energy conversion using solar light is an ideal goal in renewable energy studies. Many reports are concerned with extracting energy from solar light and the use/storage of the converted energy. Due to the progress in solar light absorption with various photocatalysts, the vari...

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Section: −1mentioning

confidence: 99%

Section: −1mentioning

confidence: 99%

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Wang

Sang

et al. 2017

Advanced Energy Materials

242

116

View full text Add to dashboard Cite

show abstract

“…[1] From both economic and environmental remediation viewpoints,i ti so fp articular interest to develop al owcost, stable,and environmentally benign system that can drive the overall water splitting reaction in an efficient manner. [2b] In recent years,s ubstantial efforts have been made to advance the properties of PCN,s uch as surface active-site regulation, [3] nanoarchitecture construction, [4] heterojunction design, [5] and band structure engineering. [2] The results have revealed that PCN in its pristine form only shows moderate activity because of its intrinsic properties,s uch as rapid charge-carrier recombination and moderate wateroxidation ability.…”

mentioning

confidence: 99%

Polymeric Carbon Nitride/Reduced Graphene Oxide/Fe₂O₃: All‐Solid‐State Z‐Scheme System for Photocatalytic Overall Water Splitting

2019

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The charge transfer between hydrogen evolution photocatalysts (HEPs) and oxygen evolution photocatalysts (OEPs) is the rate-determining step that controls the overall performance of aZ -scheme water-splitting system. Here,w e carefully design reduced graphene oxide (RGO) nanosheets for use as solid-state mediators to accelerate the charge carrier transfer between HEPs (e.g., polymeric carbon nitride (PCN)) and OEPs (e.g., Fe 2 O 3 ), thus achieving efficient overall water splitting.T he important role of RGO could also be further proven in other PCN-based Z-systems (BiVO 4 /RGO/PCN and WO 3 /RGO/PCN), illustrating the universality of this strategy.

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“…[29] Recently,W ang and co-workers realized photocatalytic overall water splittingby using crystalline PTI modified with suitable co-catalysts.A sr evealed by DFT calculations,t he band gap of the PTI was straddled over the redox potential of water, which guaranteed that overall water splitting was thermodynamically feasible (Figure 8a). [29] Recently,W ang and co-workers realized photocatalytic overall water splittingby using crystalline PTI modified with suitable co-catalysts.A sr evealed by DFT calculations,t he band gap of the PTI was straddled over the redox potential of water, which guaranteed that overall water splitting was thermodynamically feasible (Figure 8a).…”

Section: Synthesis Characterization and Application Of Ccns In Watementioning

confidence: 99%

Crystalline Carbon Nitride Semiconductors for Photocatalytic Water Splitting

2019

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Conjugated carbon nitride (CN) is an emerging and promising semiconductor photocatalyst for water photolysis owing to its unique properties. However, the traditional thermally induced polymerization of N‐containing precursors typically produces melon‐based CN solids with amorphous or semi‐crystalline structures with only moderate photocatalytic performance. Many strategies have been developed to prepare crystalline CNs (CCNs), such as high‐temperature and high‐pressure routes, ionothermal synthesis, and microwave‐assisted synthesis. In this Minireview, we summarize the progress that has been made in the synthesis of CCNs and their application in photocatalytic water splitting reactions. Three kinds of CCNs are mainly discussed according to their polymeric subunits. Challenges associated with CCNs and their future development are also included.

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Precise Formation of a Hollow Carbon Nitride Structure with a Janus Surface To Promote Water Splitting by Photoredox Catalysis

Cited by 454 publications

References 46 publications

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Polymeric Carbon Nitride/Reduced Graphene Oxide/Fe₂O₃: All‐Solid‐State Z‐Scheme System for Photocatalytic Overall Water Splitting

Crystalline Carbon Nitride Semiconductors for Photocatalytic Water Splitting

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Precise Formation of a Hollow Carbon Nitride Structure with a Janus Surface To Promote Water Splitting by Photoredox Catalysis

Cited by 454 publications

References 46 publications

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Full‐Spectrum Solar‐Light‐Activated Photocatalysts for Light–Chemical Energy Conversion

Polymeric Carbon Nitride/Reduced Graphene Oxide/Fe2O3: All‐Solid‐State Z‐Scheme System for Photocatalytic Overall Water Splitting

Crystalline Carbon Nitride Semiconductors for Photocatalytic Water Splitting

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Polymeric Carbon Nitride/Reduced Graphene Oxide/Fe₂O₃: All‐Solid‐State Z‐Scheme System for Photocatalytic Overall Water Splitting