8017a398b2c69bc0a72e26c2022495a5 pmc_9101109.pdf 731d63707a18727b969bf3494a60513ae9bf801d pmc_9101109.pdf 2a657db1ced323e1b36081f9bf3c2d02b45d65f787efabbb26f98b07d76157a7 pmc_9101109.pdf Title: 2D/2D Heterojunction of TiO2 Nanoparticles and Ultrathin G-C3N4 Nanosheets for Efficient Photocatalytic Hydrogen Evolution Subject: Photocatalytic hydrogen evolution is considered one of the promising routes to solve the energy and environmental crises. However, developing efficient and low-cost photocatalysts remains an unsolved challenge. In this work, ultrathin 2D g-C3N4 nanosheets are coupled with flat TiO2 nanoparticles as face-to-face 2D/2D heterojunction photocatalysts through a simple electrostatic self-assembly method. Compared with g-C3N4 and pure TiO2 nanosheets, 2D/2D TiO2/g-C3N4 heterojunctions exhibit effective charge separation and transport properties that translate into outstanding photocatalytic performances. With the optimized heterostructure composition, stable hydrogen evolution activities are threefold and fourfold higher than those of pure TiO2, and g-C3N4 are consistently obtained. Benefiting from the favorable 2D/2D heterojunction structure, the TiO2/g-C3N4 photocatalyst yields H2 evolution rates up to 3875 molg-1h-1 with an AQE of 7.16% at 380 nm. Keywords: hydrogen evolution; 2D/2D heterojunction; charge separation Author: Ruifeng Du, Baoying Li, Xu Han, Ke Xiao, Xiang Wang, Chaoqi Zhang, Jordi Arbiol and Andreu Cabot Creator: LaTeX with hyperref Producer: pdfTeX-1.40.21 CreationDate: Thu May 12 08:39:20 2022 CEST ModDate: Thu May 12 08:49:55 2022 CEST Tagged: no UserProperties: no Suspects: no Form: none JavaScript: no Pages: 11 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 5562105 bytes Optimized: no PDF version: 1.7 name type encoding emb sub uni object ID ------------------------------------ ----------------- ---------------- --- --- --- --------- UKFICR+VnURWPalladioL Type 1 Custom yes yes no 10 0 OVNEXW+EURM10 Type 1 Builtin yes yes no 15 0 EVWRIJ+URWPalladioL-Bold Type 1 Custom yes yes no 19 0 XFNZKJ+URWPalladioL-Roma Type 1 Custom yes yes no 24 0 VDATAK+URWPalladioL-Ital Type 1 Custom yes yes no 28 0 WXMRPJ+CMSY10 Type 1 Builtin yes yes no 32 0 NPLVPL+TimesNewRomanPS-BoldItalicMT Type 1C WinAnsi yes yes no 50 0 PNCNNL+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 84 0 PNCNNM+PalatinoLinotype CID TrueType Identity-H yes yes yes 87 0 PNCNNN+PalatinoLinotype TrueType WinAnsi yes yes no 93 0 PNCNNP+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 96 0 PNCNNL+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 114 0 PNCNNM+PalatinoLinotype CID TrueType Identity-H yes yes yes 117 0 PNCNNN+PalatinoLinotype TrueType WinAnsi yes yes no 123 0 PNCNNP+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 126 0 PNCNNL+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 142 0 PNCNNN+PalatinoLinotype TrueType WinAnsi yes yes no 145 0 PNCNNP+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 148 0 PNCNNL+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 162 0 PNCNNM+PalatinoLinotype CID TrueType Identity-H yes yes yes 165 0 PNCNNN+PalatinoLinotype TrueType WinAnsi yes yes no 171 0 PNCNNP+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 174 0 PNCNNL+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 188 0 PNCNNM+PalatinoLinotype CID TrueType Identity-H yes yes yes 191 0 PNCNNN+PalatinoLinotype TrueType WinAnsi yes yes no 197 0 PNCNNP+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 200 0 PNDPMF+TimesNewRoman,Italic CID TrueType Identity-H yes yes yes 211 0 PNCNNL+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 217 0 PNCNNN+PalatinoLinotype TrueType WinAnsi yes yes no 220 0 PNCNNP+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 223 0 PNDPME+CambriaMath CID TrueType Identity-H yes yes yes 226 0 DXJXEP+CMEX10 Type 1 Builtin yes yes no 236 0 FERHKG+CMR10 Type 1 Builtin yes yes no 240 0 PNCNNL+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 251 0 PNCNNN+PalatinoLinotype TrueType WinAnsi yes yes no 254 0 PNCNNP+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 257 0 Jhove (Rel. 1.22.1, 2019-04-17) Date: 2022-09-10 02:29:00 CEST RepresentationInformation: pmc_9101109.pdf ReportingModule: PDF-hul, Rel. 1.12.1 (2019-04-17) LastModified: 2022-09-05 13:37:45 CEST Size: 5562105 Format: PDF Version: 1.7 Status: Well-Formed and valid SignatureMatches: PDF-hul MIMEtype: application/pdf PDFMetadata: Objects: 397 FreeObjects: 1 IncrementalUpdates: 0 DocumentCatalog: PageLayout: SinglePage PageMode: UseNone Outlines: Item: Title: Introduction Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@4923ab24 Item: Title: Experiment Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@44c8afef Item: Title: Result and Discussion Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@7b69c6ba Item: Title: Conclusions Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@46daef40 Item: Title: References Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@12f41634 Info: Title: 2D/2D Heterojunction of TiO2 Nanoparticles and Ultrathin G-C3N4 Nanosheets for Efficient Photocatalytic Hydrogen Evolution Author: Ruifeng Du, Baoying Li, Xu Han, Ke Xiao, Xiang Wang, Chaoqi Zhang, Jordi Arbiol and Andreu Cabot Subject: Photocatalytic hydrogen evolution is considered one of the promising routes to solve the energy and environmental crises. However, developing efficient and low-cost photocatalysts remains an unsolved challenge. In this work, ultrathin 2D g-C3N4 nanosheets are coupled with flat TiO2 nanoparticles as face-to-face 2D/2D heterojunction photocatalysts through a simple electrostatic self-assembly method. Compared with g-C3N4 and pure TiO2 nanosheets, 2D/2D TiO2/g-C3N4 heterojunctions exhibit effective charge separation and transport properties that translate into outstanding photocatalytic performances. With the optimized heterostructure composition, stable hydrogen evolution activities are threefold and fourfold higher than those of pure TiO2, and g-C3N4 are consistently obtained. Benefiting from the favorable 2D/2D heterojunction structure, the TiO2/g-C3N4 photocatalyst yields H2 evolution rates up to 3875 molg-1h-1 with an AQE of 7.16% at 380 nm. 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