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<p>“Great scientific challenge is the development of multifunctional semiconductor materials that can help to address the issues of converting renewable energy to energy and environmental remediation at the same time. Zn<sub>2</sub>SnO<sub>4</sub> nanostructures. In the current study, Zn<sub>2</sub>SnO<sub>4</sub> nanoparticles were synthesized by simple solvothermal method. The structures were tested as a platinum-free counter electrode for dye-sensitized solar cells (DSSCs) and Cr(VI) photoreduction under visible light. X-ray diffraction proved the creation of phase-pure cubic spinel Zn2SnO4 with an average crystallite size of 25–30 nm, while optical investigations revealed a band gap of 4.2&#xa0;eV. The Zn2SnO4 counter electrode showed better electrocatalytic activity with a power conversion efficiency (PCE) of 7.7 ± 0.02% (higher than the typical Pt counter electrode of 6.7 ± 0.01%) with a <i>Voc</i> of 0.891 ± 0.04 V, <i>Jsc</i> of 13.4 ± 0.02&#xa0;mA cm<sup>− 2</sup>, and FF of 63.23 ± 0.10%. The efficiency of the device remained at 7.4% after 500 hours, demonstrating remarkable operational stability. The electrochemical impedance spectroscopy revealed a low solution resistance (Rs = 4.5 Ω) and charge-transfer resistance (<i>Rct</i> = 8.9 Ω)and transient photocurrent experiments indicated a constant maximum photocurrent density of 18 µA cm⁻², agreeing with the presence of good charge separation and transport. Furthermore, Zn₂SnO₄ achieved 82% photocatalytic reduction of Cr(VI) in 60 min under visible-light irradiation, and a rate constant of 0.0287 min⁻¹ and showed excellent reusability across five consecutive cycles. The results highlight Zn<sub>2</sub>SnO<sub>4</sub> as a possible and low-cost versatile material to perform effectively in high-performance DSSCs and sustainable wastewater treatment.</p>

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Band-structure-driven photocatalytic Cr(VI) reduction and enhanced DSSC performance using Zn₂SnO₄ nanostructures

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • G. Krishnamoorthi,
  • R. Lavanya,
  • S. Anbumani,
  • R. Kavin

摘要

“Great scientific challenge is the development of multifunctional semiconductor materials that can help to address the issues of converting renewable energy to energy and environmental remediation at the same time. Zn2SnO4 nanostructures. In the current study, Zn2SnO4 nanoparticles were synthesized by simple solvothermal method. The structures were tested as a platinum-free counter electrode for dye-sensitized solar cells (DSSCs) and Cr(VI) photoreduction under visible light. X-ray diffraction proved the creation of phase-pure cubic spinel Zn2SnO4 with an average crystallite size of 25–30 nm, while optical investigations revealed a band gap of 4.2 eV. The Zn2SnO4 counter electrode showed better electrocatalytic activity with a power conversion efficiency (PCE) of 7.7 ± 0.02% (higher than the typical Pt counter electrode of 6.7 ± 0.01%) with a Voc of 0.891 ± 0.04 V, Jsc of 13.4 ± 0.02 mA cm− 2, and FF of 63.23 ± 0.10%. The efficiency of the device remained at 7.4% after 500 hours, demonstrating remarkable operational stability. The electrochemical impedance spectroscopy revealed a low solution resistance (Rs = 4.5 Ω) and charge-transfer resistance (Rct = 8.9 Ω)and transient photocurrent experiments indicated a constant maximum photocurrent density of 18 µA cm⁻², agreeing with the presence of good charge separation and transport. Furthermore, Zn₂SnO₄ achieved 82% photocatalytic reduction of Cr(VI) in 60 min under visible-light irradiation, and a rate constant of 0.0287 min⁻¹ and showed excellent reusability across five consecutive cycles. The results highlight Zn2SnO4 as a possible and low-cost versatile material to perform effectively in high-performance DSSCs and sustainable wastewater treatment.