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Defect-induced optical and electrochemical properties of Pr2Sn2O7 nanoparticles enhanced by Bi3+ doping

Published online by Cambridge University Press:  20 April 2020

Allen Abraham ,
Santosh K. Gupta ,
Swati Mohan ,
Hisham Abdou  and
Yuanbing Mao
Allen Abraham
Affiliation:
Department of Chemistry, University of Texas Rio Grande Valley, Edinburg, Texas 78539, USA
Santosh K. Gupta
Affiliation:
Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai-400085, India
Swati Mohan
Affiliation:
Department of Chemistry, University of Texas Rio Grande Valley, Edinburg, Texas 78539, USA
Hisham Abdou
Affiliation:
Department of Chemistry, University of Texas Rio Grande Valley, Edinburg, Texas 78539, USA
Yuanbing Mao*
Affiliation:
Department of Chemistry, Illinois Institute of Technology, Chicago, Illinois 60616, USA
*
a)Address all correspondence to this author. e-mail: ymao17@iit.edu
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Abstract

Materials that show superior light-emitting and catalytic properties are in high demand among the scientific community owing to their applications in the areas of optoelectronics and (opto)electrocatalysis. In this work, we have synthesized sub-10-nm Pr2Sn2O7 (PSO) and Pr2Sn2O7:Bi3+ (PSOB) nanoparticles (NPs) and investigated their optical and electrochemical properties. On ultraviolet irradiation, PSO NPs display blue emission because of the presence of oxygen vacancies. Interestingly, PSOB NPs have higher blue emission intensity than undoped PSO NPs owing to the increase in oxygen vacancy defect density induced by Bi3+ doping. Moreover, PSOB NPs display higher efficiency in terms of current density than PSO NPs as a catalyst toward the oxygen evolution reaction (OER). The kinetic OER models of PSO and PSOB NPs are quite different as displayed by their different Tafel slopes. Interestingly and as another advantage, the PSOB sample is more conducting with low impedance value than the PSO counterpart. With all these advantages due to high oxygen vacancies induced by Bi3+ doping, PSOB NPs have a great potential to be used as blue phosphors, charge storage devices, and capacitors.

Keywords

Pr2Sn2O7bismuthoxygen vacancyphotoluminescencecurrent density
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 9 , 14 May 2020 , pp. 1214 - 1224
Copyright
Copyright © Materials Research Society 2020

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