Efficient photocathode performance of lithium ion doped LaFeO3nanorod arrays in hydrogen evolution

Yang Li, Tao Wang, Bin Gao, Xiaoli Fan, Hao Gong, Hairong Xue, Songtao Zhang, Xianli Huang, Jianping He

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Most of the photocathode semiconductors that can be used for hydrogen production are difficult to prepare or get corroded in the electrolyte of an aqueous solution. Hence it is a huge challenge to develop stable photoelectrochemical (PEC) hydrogen evolution systems. Perovskite-type LaFeO3, as a new p-type semiconductor, is used in the PEC hydrogen evolution reaction and shows excellent stability. We synthesized a high-purity LaFeO3 nanorod array on an FTO substrate and its bandgap is 2.14 eV. Moreover, the carrier migration efficiency of a LaFeO3 photocathode is improved by doping with Li ions, and the doping effect also causes a red-shift of the optical maximum absorption edge. As a result, the photocurrent density of the Li-doped LaFeO3 photocathode is increased from -30 μA cm-2 (LaFeO3) to -50 μA cm-2 at 0.4 V (vs. RHE). Herein, the Li-doped LaFeO3 show great potential as a PEC photocathode for achieving an efficient, stable and inexpensive PEC hydrogen evolution reaction.

Original languageEnglish
Pages (from-to)3463-3468
Number of pages6
JournalNew Journal of Chemistry
Volume45
Issue number7
DOIs
StatePublished - 21 Feb 2021
Externally publishedYes

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