ZnO/CdS/PbS nanotube arrays with multi-heterojunctions for efficient visible-light-driven photoelectrochemical hydrogen evolution

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Ruonan Wang
  • Sibo Chen
  • Qiongzhi Gao
  • Siyuan Yang
  • Shanqing Zhang
  • Feng Peng
  • Yueping Fang
  • Shengsen Zhang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)658-666
Journal / PublicationChemical Engineering Journal
Volume362
Early online date16 Jan 2019
Publication statusPublished - 15 Apr 2019

Abstract

High performance, low cost and sustainable photocatalytic evolution of hydrogen is a promising energy supply alternative for modern society to resolve the depletion crisis of fossil fuel. The design of multi-heterojunction visible-light photocatalysts combined with electrochemical means is considered one of the most attractive options in recent years. In this work, a photoanode composed of top-opened ZnO/CdS/PbS nanotube arrays (ZnO/CdS/PbS ONTs) with multi-heterojunctions was synthesized via a three-step process, i.e. hydrothermal treatment, chemical bath deposition and successive ionic layer adsorption reaction (SILAR). This as-prepared photoanode exhibited remarkable photoelectrochemical activity under visible light irradiation. The photocurrent density and photoelectrochemical hydrogen evolution efficiency of the optimized ZnO/CdS/PbS ONTs reached up to 14.2 mA cm−2 and 5.5 mL cm−2 h−1 at 0.0 V vs. Ag/AgCl, respectively. The efficiency was 3.1 times that of top-closed ZnO/CdS nanotubes (1.8 mL cm−2 h−1). The experimental results suggest that the high photoelectrochemical activity can be ascribed to the inherent advantages of the structural and successive energy level relays design: on the one hand, the top-opened nanotube structure significantly enlarges surface area of the nanostructure, which facilitates efficient light absorption and rapid mass transport; on the other hand, the well-matched band energy edge of the multi-heterojunction interfaces literally build efficient electron highways to deliver electrons to reaction sites and reduce the recombination of photogenerated charge carriers.

Research Area(s)

  • CdS, Multi-heterojunction, PbS, Photoelectrochemical hydrogen evolution, Visible light, ZnO

Citation Format(s)

ZnO/CdS/PbS nanotube arrays with multi-heterojunctions for efficient visible-light-driven photoelectrochemical hydrogen evolution. / Wang, Ruonan; Chen, Sibo; Ng, Yun Hau; Gao, Qiongzhi; Yang, Siyuan; Zhang, Shanqing; Peng, Feng; Fang, Yueping; Zhang, Shengsen.

In: Chemical Engineering Journal, Vol. 362, 15.04.2019, p. 658-666.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review