Journal
ACS APPLIED ENERGY MATERIALS
Volume 5, Issue 2, Pages 1755-1766Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c03200
Keywords
photocatalysts; nonstoichiometric; phase transformation; hydrogen evolution; spinel structure
Funding
- Ministry of Science and Technology, Taiwan (MOST) [MOST-110-2221-E-011-100-MY3, MOST-110-2221-E-011-070-MY3, MOST-110-2811-E-011-507, MOST-109-2811-E-011-503]
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This study systematically investigates the effect of nickel doping on the crystal structure and photocatalytic hydrogen production of ZnInOS/In(OH)(3) nanocomposite. It is found that nickel doping can transform the crystal structure and enhance the hydrogen production rate. The 10% nickel-doped ZI-50 catalyst shows the highest hydrogen evolution reaction rate.
Photocatalytic hydrogen production has been considered as one of the effective methods to produce hydrogen as a green energy carrier in the future. This report systematically investigates the effect of nickel doping on the crystal structure, optical properties, and photocatalytic hydrogen production rate of the ZnInOS/In(OH)(3) nanocomposite (denoted as ZI-50). It is found that nickel doping could transform the phase of ZI-50 from two phases of ZnInOS and In(OH)(3) into a single phase with a ZnIn2S4 spinel structure. More importantly, all Ni-doped ZI-50 catalysts are nonstoichiometric and highly defective with a Zn(Zn,Ni,In)(2)(O,S)(4-x) spinel structure. 10% nickel precursor-doped ZI-50 as the best catalyst can achieve the highest hydrogen evolution reaction rate of 1700 mu mol/g.h, which is much higher than those of Ni-free ZI-50 (340 mu mol/g.h) and stoichiometric ZnIn2S4 (110 mu mol/g.h). A kinetic mechanism for enhancing photocatalytic hydrogen evolution based upon the cationic antisite defects and anionic oxygen vacancy was proposed and explained.
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