Engineering of a high-efficiency water splitting photoanode by synergistic effects of doping, compositing, and coupling on TiO2 nanoparticles

被引：19

作者：

Sajjadizadeh, Halimeh-Sadat ^{[1
]}

Ahmadzadeh, Hossein ^{[1
]}

Goharshadi, Elaheh K. ^{[1
,2
]}

Aziznezhad, Mohammad ^{[1
]}

机构：

[1] Ferdowsi Univ Mashhad, Fac Sci, Dept Chem, Mashhad 9177948974, Razavi Khorasan, Iran

[2] Ferdowsi Univ Mashhad, Nano Res Ctr, Mashhad 9177948974, Razavi Khorasan, Iran

来源：

ELECTROCHIMICA ACTA | 2020年 / 362卷

关键词：

Photoelectrochemical water splitting; Alkaline earth metal; VO2; TiO2; METAL-INSULATOR-TRANSITION; THERMOCHROMIC SMART GLASS; HYDROGEN-PRODUCTION; TITANIUM-DIOXIDE; HETEROJUNCTION PHOTOANODE; OPTICAL-PROPERTIES; GRAPHENE OXIDE; THIN-FILMS; DOPED TIO2; SOLAR;

D O I：

10.1016/j.electacta.2020.137149

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Highly efficient photoelectrochemical (PEC) water splitting is achieved by Ag doped hierarchical porous TiO2 nanoparticles in compositing with GQDs (TiO2:Ag-GQDs). The unique optical properties of VO2 (m), monoclinic phase of VO2, is a motivation to use it in PEC processes. To further improve the efficiency of TiO2:Ag-GQDs photoanode, it is coupled with undoped and doped VO2 (m) with earth alkali metals. This coupling strategy is used to engineer the interfacial and optical properties and charge separation/transport on the photoanodes for PEC water splitting. Hence, the efficiency of the photoanodes with structures of TiO2:Ag-GQDs/VO2 or (Mg, Ca, Sr, or Ba)-doped VO2 in PEC water splitting process is investigated. A remarkable photocurrent density of 1.5 mA/cm(2) at 1.23 V vs. RHE is achieved for FLGs/TiO2 :AgGQDs/VO2:Ba photoanode. This value is 20 times higher than that of reported previously for pristine TiO2 photoanode (0.07 mA/cm(2) at 1.23 V vs RHE). (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：12

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