Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 4, Pages 1495-1508Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta08172j
Keywords
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Funding
- DST
- BRNS
- ISM [SERB/F/2798/2016-17, SB/FT/CS-155/2012, FRS/43/2013-2014/AC, SR/FTP/PS-157/2011, FRS/34/2012-2013/APH, 34/14/21/2014-BRNS]
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Manufacturing, designing and developing economic but highly efficient bifunctional catalysts for water splitting technology have become necessary for the large-scale commercialization of regenerative fuel cells. In this work, for the first time, uniformly sized molybdenum/tungsten diselenide and cadmium disulfide nanohybrid quantum dots (MoSe2:CdS and WSe2:CdS NHDs) have been synthesized by a simple hydrothermal technique. The highly exfoliated and defect-abundant nanostructure possess abundant active sites and therefore shows bifunctional behavior with high catalytic activity towards the oxygen reduction/evolution reactions (ORR/OER). The WSe2:CdS NHDs exhibit a small onset potential of + 1.1 V vs. RHE and -0.26 V with a small Tafel slope of 49 mV dec(-1) and 27 mV dec(-1) for OER and ORR, respectively. Moreover, having a quantum sized structure along with CdS also made the NHDs a promising and biocompatible fluorescent probe for metal ion (Pb2+) analysis. The PL emission from NHDs is of high energy and is more intense than the bare NDs, with a very good quantum yield of 87%. The prepared NHDs show a highly stable fluorescence and NHDs coated paper strips were successfully implemented for trace level (20.0 mu g L-1) analysis of Pb2+ in real samples (human blood, urine, and polluted water). However, the NHDs were also employed for ultra-trace level (500.0 ng L-1) detection of Pb2+, which confirm the highly selective, sensitive and multi-functional behavior of the prepared NHDs. Therefore, it is envisaged that this work may provide a simple route to synthesize multi-talented 2D layered nanodots suitabile for imaging, sensing, and other energy-related technologies.
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