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Enhanced solar light driven hydrogen generation and environment remediation through Nd incorporated ZnIn2S4.

Authors :
Janani, R.
Priyanga, G.Sudha
Behara, Santosh
Melvin, Ambrose Ashwin
Shaheer, A.R.M.
Thomas, Tiju
Neppolian, Bernaurdshaw
Singh, Shubra
Source :
Renewable Energy: An International Journal. Dec2020, Vol. 162, p2031-2040. 10p.
Publication Year :
2020

Abstract

Visible-light-driven hydrogen production is a promising pathway to realize efficient solar energy utilization. Here, Nd3+ incorporated ZnIn 2 S 4 (Nd-ZIS) was synthesized via facile one step hydrothermal method. Raman spectroscopy and X-ray Photoelectron Spectroscopy (XPS) confirm the successful incorporation of Nd3+ in ZnIn 2 S 4. Optical studies reveal the reduction of effective bandgap from 2.7 eV to 2.54 eV upon incorporation of Nd3+ with improved charge carrier life time of 3.12 ns. Electronic properties of ZIS and Nd-ZIS were investigated from first principle calculations. An attempt to improve photocatalytic activity of ZIS by modification with Nd3+ ions resulted in degradation of organic pollutant up to 98% under natural sunlight and decrease in life time of trap states up to a nominal value of 200 ms (as evident from photoelectrochemical measurements). The mechanism behind enhancement of photocatalytic activity of ZIS post Nd3+ integration has been proposed. Nd-ZIS was also utilized for water splitting activity exhibiting a considerable H 2 generation ∼3415 μmol g−1. To the best of our knowledge, activity of Nd3+ incorporated ZIS has been explored for the first time in present work. It is believed that an in-depth understanding of photoactivity of ZIS would be significantly important for designing materials with desired photocatalytic performance in future. Image 1 • Self-assembled hierarchical structures with improved photocatalytic activity. • Introduction of Nd3+ levels below the conduction band boosts carrier separation. • Multifunctional material with superior photoresponse. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09601481
Volume :
162
Database :
Academic Search Index
Journal :
Renewable Energy: An International Journal
Publication Type :
Academic Journal
Accession number :
147000010
Full Text :
https://doi.org/10.1016/j.renene.2020.09.081