Electrosprayed MnO2 on ZnO nanorods with atomic layer deposited TiO2 layer for photoelectrocatalytic water splitting

被引：61

作者：

Kim, Min-Woo ^{[1
]}

Joshi, Bhavana ^{[1
]}

Samuel, Edmund ^{[1
]}

Seok, Hyunjun ^{[1
]}

Aldalbahi, Ali ^{[2
]}

Almoigli, Mohammed ^{[3
]}

Swihart, Mark T. ^{[4
,5
]}

Yoon, Sam S. ^{[1
]}

机构：

[1] Korea Univ, Sch Mech Engn, Seoul 02841, South Korea

[2] King Saud Univ, Coll Sci, Dept Chem, Riyadh 11451, Saudi Arabia

[3] King Abdulassis City Sci & Technol, Nucl Sci Res Inst, Riyadh 11442, Saudi Arabia

[4] Univ Buffalo, State Univ New York, Dept Chem & Biol Engn, Buffalo, NY 14260 USA

[5] Univ Buffalo, State Univ New York, RENEW Inst, Buffalo, NY 14260 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2020年 / 271卷

基金：

新加坡国家研究基金会;

关键词：

ZnO nanorods; Electrostatic spray; Water splitting; Photocatalyst; Ultrathin TiO2; PHOTOCATALYTIC ACTIVITY; BISMUTH VANADATE; TEXTILE DYE; SOLAR; NANOCOMPOSITES; DEGRADATION; NANOPARTICLES; PHOTOANODES; PERFORMANCE; OXIDATION;

D O I：

10.1016/j.apcatb.2020.118928

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have designed and produced a hierarchical photocatalyst for water splitting by first fabricating ZnO nanorods via a chemical bath deposition (CBD) process using ZnO seeds electrosprayed onto In-doped tin oxide (ITO), then electrospraying MnO2 particles as a co-catalyst, and finally depositing an ultrathin passivation layer of TiO2 via atomic layer deposition. These hierarchical photocatalysts exhibit excellent photoelectrochemical properties and reduced photocorrosion compared to materials without TiO2 coating. Moreover, the MnO2-garnished ZnO nanorods obtained at 550 degrees C deliver a 1.7-fold enhancement in photocurrent density (0.95 mA/cm(2)) at 1.2 V-Ag/A(gCl) in 0.5-M Na2SO3 solution compared to ZnO nanorods without MnO2. We attribute improved photocurrent density to rapid charge transfer and charge separation at the ZnO-MnO2 interface. This investigation illustrates a balanced design of a nanoarchitecture for photoelectrodes that favors formation of effective photoelectrocatalytic sites while improving stability for potential large-scale water splitting applications.

引用

页数：11