Synthesis, Structural and Optical Properties of ZrBi2Se6Nanoflowers: A Next-Generation Semiconductor Alloy Material for Optoelectronic Applications

Rahul Aher, Ashvini Punde, Pratibha Shinde, Shruti Shah, Vidya Doiphode, Ashish Waghmare, Yogesh Hase, Bharat R. Bade, Yogesh Jadhav, Mohit Prasad, Habib M. Pathan, Shashikant P. Patole, Sandesh R. Jadkar

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

ZrBi2Se6 nanoflower-like morphology was successfully prepared using a solvothermal method, followed by a quenching process for photoelectrochemical water splitting applications. The formation of ZrBi2Se6 was confirmed by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The estimated value of work function and band gap were found to be 5.5 and 2.26 eV measured using diffuse reflection spectroscopy and ultraviolet photoelectron spectroscopy, suggesting the potential candidate for water splitting. The highest current density of 9.7 μA/cm2 has been observed for the ZrBi2Se6 photoanode for the applied potential of 0.5 V vs SCE. The flat-band potential value was -0.46 V, and the 1.85 nm width of the depletion region is estimated from the Mott-Schottky (MS) analysis. It also reveals that the charge carrier density for the ZrBi2Se6 nanoflowers is 4.8 × 1015 cm-3. The negative slope of the MS plot indicates that ZrBi2Se6 is a p-type semiconductor. It was observed that ZrBi2Se6 nanoflowers had a high charge transfer resistance of ∼730 kω and equivalent capacitance of ∼40 nF calculated using electrochemical impedance spectroscopy (EIS) measurements. Using chronoamperometry, the estimated rise time and decay time were 50 ms and 0.25 s, respectively, which reveals the fast photocurrent response and excellent PEC performance of the ZrBi2Se6 photoanode. Furthermore, an attempt has been made to explain the PEC activity of ZrBi2Se6 nanoflowers using an energy band diagram. Thus, the initial results on ZrBi2Se6 nanoflowers appear promising for the PEC activity toward water splitting.

Original languageBritish English
Pages (from-to)31877-31887
Number of pages11
JournalACS Omega
Volume7
Issue number36
DOIs
StatePublished - 13 Sep 2022

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