ORIGINAL RESEARCH
Electrocatalytic Water Splitting Potential of
Cymbopogon citratus-Mediated Biosynthesized
Strontium Oxide Nanoparticles
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1
Institute of Chemistry, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan 64200,
Pakistan
2
Institute of Chemical and Environmental Engineering, Khwaja Fareed University of Engineering and Information
Technology, Rahim Yar Khan 64200, Pakistan
3
Department of Chemistry, Forman Christian College (A Chartered University) Lahore 54600, Pakistan
4
Department of Zoology, University of Mianwali, 42200, Pakistan
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Department of Chemistry, University of Lahore Sargodha Campus, Pakistan
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Institute of Chemistry, University of Sargodha, 40100, Pakistan
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Department of Zoology, College of Science, King Saud University, `Riyadh 11451, Saudi Arabia
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Director of Research Engineering (Penryn Campus), Environment and Sustainability Institute, University of Exeter,
Penryn Campus, Penryn, TR10 9FE, UK
Submission date: 2024-09-11
Final revision date: 2024-12-16
Acceptance date: 2025-06-10
Online publication date: 2025-09-15
Corresponding author
Shabbir Hussain
Institute of Chemistry, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan 64200,
Pakistan
KEYWORDS
TOPICS
ABSTRACT
Strontium-based nanoparticles (NPs) find applications in energy storage, electronics, optoelectronic
devices, lightning, FETs, LEDs, television screens, display units, fabrication of sensors, wastewater
treatment, vehicles of space and navigation, remote weather stations, and in the field of medicine
(antibacterial agents, tissue engineering, orthopedics, bone regeneration, bone health, and in the
treatment of osteoporosis, etc.). Recently, plant-mediated green synthesis of NPs has gained significant
attention due to its eco-friendly, sustainable, and cost-effective approach. The green production of
strontium oxide (SrO) NPs is rarely reported in earlier literature, which is the focus of the current study.
We synthesized SrOaq and SrOet NPs by utilizing the aqueous and ethanolic extracts of Cymbopogon
citratus (lemon grass). The synthesized NPs were analyzed by FTIR, X-ray diffraction (XRD), and UVvisible
spectroscopies. FTIR analysis showed the presence of organic moieties and characteristic Sr-O
bands. UV-visible spectroscopy displayed an absorption peak at 298 and 298.9 nm in SrOaq and SrOet,
respectively. SrOet exhibited a smaller band gap (4.25 eV) than SrOaq (4.47 eV). The synthesized NPs possessed well-defined crystalline structures and exhibited good electrocatalytic performance for water
splitting. SrOet was found to be a more effectual electrocatalyst for oxygen evolution reaction (OER)
and hydrogen evolution reaction (HER) due to its higher electrochemically active surface area (EASA)
and smaller charge transfer resistance (Rct = 60Ω) than those of SrOaq. The investigated NPs displayed
promising redox behavior, charge storage capacity, and catalytic efficiency, highlighting their potential
usage in energy storage and electrocatalytic water splitting.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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