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Perovskite Oxide LaNiO 3 Nanoparticles for Boosting H 2 Evolution over Commercial CdS with Visible Light
Author(s) -
Xu Junli,
Sun Chunfang,
Wang Zhaoyu,
Hou Yidong,
Ding Zhengxin,
Wang Sibo
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201802920
Subject(s) - lanio , photocatalysis , materials science , perovskite (structure) , photocurrent , dielectric spectroscopy , nanoparticle , heterojunction , visible spectrum , chemical engineering , photochemistry , electrochemistry , nanotechnology , catalysis , chemistry , electrode , optoelectronics , organic chemistry , dielectric , engineering , ferroelectricity
LaNiO 3 /CdS heterojunction photocatalysts are constructed by compositing LaNiO 3 nanoparticles with commercially available CdS, and are used for efficient photocatalytic splitting of H 2 O with visible light. The LaNiO 3 /CdS hybrids are characterized systematically using a series of physicochemical techniques. The photocatalytic activity of the perovskite hybrids is examined by H 2 evolution with Na 2 S‐NaSO 3 as the hole scavenger. The optimized LaNiO 3 /CdS sample without the assistance of any cocatalyst (e.g., Pt) delivers a high H 2 production rate of 74 μmol h −1 (e.g., 3700 μmol h −1 g −1 ), which is substantially superior to the individual LaNiO 3 and CdS. Besides, the composite photocatalyst also manifests high stability. The greatly improved H 2 production performance of LaNiO 3 /CdS is attributed to the facilitated separation and transport of photoinduced charge carriers, as evidenced by photoelectrochemical (PEC) analyses, such as photoluminscence spectroscopy, transient photocurrent responses, and electrochemical impedance spectroscopy. Moreover, a probable photocatalytic mechanism of the H 2 evolution reaction is proposed on the basis of the results of the catalysis evaluation and PEC tests.