Temperature-induced variations in photocatalyst properties and photocatalytic hydrogen evolution: Differences in UV, visible, and infrared radiation

Author Identifier

Hongqi Sun

ORCID : https://orcid.org/0000-0003-0907-5626

Document Type

Journal Article

Publication Title

ACS Sustainable Chemistry & Engineering

Publisher

ACS

School

School of Engineering

RAS ID

39664

Funders

Australian Research Council

Grant Number

ARC Number : DP170104264

Grant Link

http://purl.org/au-research/grants/arc/DP170104264

Comments

Li, X., Lin, J., Li, J., Zhang, H., Duan, X., Sun, H., ... Wang, S. (2021). Temperature-induced variations in photocatalyst properties and photocatalytic hydrogen evolution: Differences in UV, visible, and infrared radiation. ACS Sustainable Chemistry & Engineering, 9(21), 7277-7285. https://doi.org/10.1021/acssuschemeng.1c01262

Abstract

In this work, solar-heating-induced temperature-based photocatalytic hydrogen evolution reaction (PC-HER) of different photocatalysts (TiO2 P25, g-C3N4, and their loaded Pt) was comprehensively studied and analyzed with the assistance of a series of temperature-based in situ characterizations. It was found that pristine TiO2 P25 and g-C3N4 displayed enhanced PC-HER performances with increasing temperature (25-65 °C), while their loaded Pt nanoparticles (NPs) demonstrated a different behavior under ultraviolet (UV) or visible irradiation, presenting the highest hydrogen evolution rate at 35 °C. More interestingly, Pt NPs-g-C3N4 showed increasing PC-HER performances from 25 to 65 °C under visible light irradiation. Characterizations suggested that lowered electrical impedance, reduced band gap, increased light absorption, and elongated photoelectron lifetime with increased temperature are beneficial for improved PC-HER. However, agglomeration of Pt NPs significantly deteriorated the PC-HER performance at higher temperature and UV light can aggravate the thermal agglomeration of Pt NPs.

DOI

10.1021/acssuschemeng.1c01262

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