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Park, Hyesung
Low-Dimensional Materials & Energy Conversion Lab
Research Interests
  • Nano materials, renewable energy, optoelectronic devices

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A thermodynamic approach toward selective and reversible sub-ppm H2S sensing using ultra-small CuO nanorods impregnated with Nb2O5 nanoparticles

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Title
A thermodynamic approach toward selective and reversible sub-ppm H2S sensing using ultra-small CuO nanorods impregnated with Nb2O5 nanoparticles
Author
Purbia, RahulKwon, Yeong MinChoi, Sung YeolKim, Sang HeonLee, Yun SikAhi, Zehra BetulPark, HyesungBaik, Jeong Min
Issue Date
2021-08
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.9, no.32, pp.17425 - 17433
Abstract
This paper provides an ideal solution to the challenges of employing CuO nanoparticles for the reversible, selective, and stable detection of sub-ppm H2S gas. This scheme presents a hidden thermodynamic advantage that makes both sulfidation and oxidation reactions reversible over a wide range of temperature (100-220 degrees C) by the addition of Nb2O5 nanoparticles coupled with Gibbs free energy changes. Our optimized sensor composed of CuO-Nb2O5 composites at 220 degrees C exhibits excellent selectivity toward H2S and SO2 gases, ultralow detection concentration of 500 ppb, fast response time (<180 s) and fast recovery, and reliable long-term stability (of over a month). Our spectroscopic investigations along with theoretical studies confirm that the CuO-Nb2O5 interface enables the formation of Cu2+/Nb4+ <-> Cu+/Nb5+ species due to the charge transfer between the Nb and Cu species, which energetically favors CuO sulfidation and oxidation. The Gibbs free energy calculation for the sulfidation and regeneration reaction shows that the incorporation of Nb2O5 alters the reaction equilibrium over a wide range of temperature. Thus, our study provides insight into a thermodynamic strategy for designing metal oxide composite catalysts for improved catalytic reactions.
URI
https://scholarworks.unist.ac.kr/handle/201301/53550
URL
https://pubs.rsc.org/en/content/articlelanding/2021/TA/D1TA03852D
DOI
10.1039/d1ta03852d
ISSN
2050-7488
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