Surface-Tailored InP Nanowires via Self-Assembled Au Nanodots for Efficient and Stable Photoelectrochemical Hydrogen Evolution

Date

2021

Authors

Narangari, Parvathala Reddy
Butson, Joshua
Tan, Hark Hoe
Jagadish, Chennupati
Karuturi, Siva Krishna

Journal Title

Journal ISSN

Volume Title

Publisher

American Chemical Society

Abstract

With a band gap close to the Shockley-Quiesser limit and excellent conduction band alignment with the water reduction potential, InP is an ideal photocathode material for photoelectrochemical (PEC) water reduction. Here, we develop facile self-assembled Au nanodots based on dewetting phenomena as a masking technique to fabricate wafer-scale InP nanowires (NWs) via a top-down approach. In addition, we report dual-function wet treatment using sulfur-dissolved oleylamine (S-OA) to remove a plasma-damaged surface in a controlled manner and stabilize InP NWs against surface corrosion in harsh electrolyte solutions. The resulting InP NW photocathodes exhibit an excellent photocurrent density of 33 mA/cm2 under 1 sun illumination in 1 M HCl with a highly stabilized performance without needing additional protection layers. Our approach combining large-area NW fabrication and surface engineering synergistically enhances light harvesting and PEC performance and stability, thereby providing a pathway for the development of efficient and durable InP photoelectrodes in a scalable manner.

Description

Keywords

InP nanowires, solar water splitting, surface engineering, photocathode, hydrogen

Citation

Source

Nano Letters

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

Restricted until

2099-12-31

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