Issue 39, 2023

Multipoint-bridging structure with a piezoelectricity-induced S-scheme junction for piezoelectricity-enhanced photoelectrochemical H2O2 production

Abstract

The construction of efficient heterojunctions can significantly facilitate the rapid separation and transfer of photogenerated charges, but the formation of an S-scheme homojunction induced by external electric fields has not been reported. Herein, a vertically aligned Sb-doped p-type CdS nanowire (p-CdSNW) array was hydrothermally synthesized on an ITO electrode, followed by the end-capping agent-assisted photodeposition of transverse Au nanorods (AuNR) to multipoint-bridge the p-CdSNW to yield a novel AuNR/p-CdSNW/ITO photocathode with a multipoint bridging structure for piezoelectricity-enhanced photoelectrochemical (PPEC) H2O2 production. The AuNR/p-CdSNW/ITO photocathode gave a PPEC photocurrent density of −6.34 mA cm−2, significantly higher than that of the electrode without stirring (−2.85 mA cm−2) and an Au nanoparticles/p-CdSNW/ITO electrode without Au-bridging (−3.36 mA cm−2). The excellent PPEC performance is explained mainly by the transverse piezoelectric field generated by the piezoelectric effect, which bends the bands of adjacent p-CdSNW at both ends of the AuNR to form interlaced energy band positions and electrostatic attraction, meeting the three essential elements of S-scheme heterojunctions, thus forming a novel piezoelectricity-induced S-scheme p-CdSNW/AuNR/p-CdSNW junction, which may contribute to the innovation and application of high-performance PPEC materials.

Graphical abstract: Multipoint-bridging structure with a piezoelectricity-induced S-scheme junction for piezoelectricity-enhanced photoelectrochemical H2O2 production

  • This article is part of the themed collection: #MyFirstJMCA

Supplementary files

Article information

Article type
Paper
Submitted
24 6 2023
Accepted
14 9 2023
First published
14 9 2023

J. Mater. Chem. A, 2023,11, 21393-21400

Multipoint-bridging structure with a piezoelectricity-induced S-scheme junction for piezoelectricity-enhanced photoelectrochemical H2O2 production

C. Chen and J. Cheng, J. Mater. Chem. A, 2023, 11, 21393 DOI: 10.1039/D3TA03709F

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