Enhanced electrocatalytic hydrogen generation from water via cobalt-doped Cu2ZnSnS4 nanoparticles

Digraskar, Renuka V.; Sapner, Vijay S.; Narwade, Shankar S.; Mali, Sawanta S.; Ghule, Anil V.; Sathe, Bhaskar R.

doi:10.1039/c8ra01886c

Cited by 38 publications

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References 66 publications

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“…The overall LSV result for the electrochemical mechanism 37 of nitrite ions (NO 2 À ) involves a reversible charge transfer reaction (eqn (4)), the obtained NO 2 disproportionation into NO 3 À and NO 2 À (eqn (5)), and in the end, the NO 2 À undergoing a unidirectional reaction for the oxidation of nitrite at the CuO modied GC electrode in an irreversible approach (eqn (6)). [44][45][46][47][48] This is in good agreement with the above presented chemical sensing studies on CuO in the solid state.…”

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confidence: 88%

Facile synthesis of highly porous CuO nanoplates (NPs) for ultrasensitive and highly selective nitrogen dioxide/nitrite sensing

et al. 2019

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confidence: 88%

Facile synthesis of highly porous CuO nanoplates (NPs) for ultrasensitive and highly selective nitrogen dioxide/nitrite sensing

et al. 2019

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“…The Figure 6c current values were found to be improved with an increase in scan rate starting from 10 to 100 mV s –1 . The linear relationship connecting the anodic peak currents with the square root of the scan rate in Figure 6d 45 indicates that NO 2 – oxidation is a diffusion-controlled reaction.…”

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confidence: 94%

Heterostructural CuO–ZnO Nanocomposites: A Highly Selective Chemical and Electrochemical NO₂ Sensor

et al. 2019

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A simple one-step chemical method is employed for the successful synthesis of CuO(50%)–ZnO(50%) nanocomposites (NCs) and investigation of their gas sensing properties. The X-ray diffraction studies revealed that these CuO–ZnO NCs display a hexagonal wurtzite-type crystal structure. The average width of 50–100 nm and length of 200–600 nm of the NCs were confirmed by transmission electron microscopic images, and the 1:1 proportion of Cu and Zn composition was confirmed by energy-dispersive spectra, i.e., CuO(50%)–ZnO(50%) NC studies. The CuO(50%)–ZnO(50%) NCs exhibit superior gas sensing performance with outstanding selectivity toward NO2 gas at a working temperature of 200 °C. Moreover, these NCs were used for the indirect evaluation of NO2 via electrochemical detection of NO2– (as NO2 converts into NO2– once it reacts with moisture, resulting into acid rain, i.e., indirect evaluation of NO2). As compared with other known modified electrodes, CuO(50%)–ZnO(50%) NCs show an apparent oxidation of NO2– with a larger peak current for a wider linear range of nitrite concentration from 20 to 100 mM. We thus demonstrate that the as-synthesized CuO(50%)–ZnO(50%) NCs act as a promising low-cost NO2 sensor and further confirm their potential toward tunable gas sensors (electrochemical and solid state) (Scheme 1).

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“…Most importantly, the quaternary compound semiconductors (CZTS and CZTSe) are composed of naturally abundant and non-toxic elements, making them ideal candidates for the large-scale production of eco-friendly thin-film solar cells compared to the current range of thin-film solar cell absorbers including CdTe and Cu(In,Ga)Se 2 (CIGS) [3,4]. Like other recently developed multi-metallic photocatalysts [5,6], the unique physiochemical and electronic properties of CZTS materials make them also attractive heterogeneous catalyst for the electrocatalytic hydrogen evolution reaction (HER) and photocatalytic degradation of polluting dyes [7,8]. Owing to efficient charge separation, heterostructures of copper-zinc oxide (CZO) have shown better activity towards hydrogen evolution reaction under sunlight than individual CuO and ZnO materials [5].…”

Section: Introductionmentioning

confidence: 99%

Interface Structure and Band Alignment of CZTS/CdS Heterojunction: An Experimental and First-Principles DFT Investigation

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We report a phase-pure kesterite Cu2ZnSnS4 (CZTS) thin films, synthesized using radio frequency (RF) sputtering followed by low-temperature H2S annealing and confirmed by XRD, Raman spectroscopy and XPS measurements. Subsequently, the band offsets at the interface of the CZTS/CdS heterojunction were systematically investigated by combining experiments and first-principles density functional theory (DFT) calculations, which provide atomic-level insights into the nature of atomic ordering and stability of the CZTS/CdS interface. A staggered type II band alignment between the valence and conduction bands at the CZTS/CdS interface was determined from Cyclic Voltammetry (CV) measurements and the DFT calculations. The conduction and valence band offsets were estimated at 0.10 and 1.21 eV, respectively, from CV measurements and 0.28 and 1.15 from DFT prediction. Based on the small conduction band offset and the predicted higher positions of the VBmax and CBmin for CZTS than CdS, it is suggested photogenerated charge carriers will be efficient separated across the interface, where electrons will flow from CZTS to the CdS and and vice versa for photo-generated valence holes. Our results help to explain the separation of photo-excited charge carriers across the CZTS/CdS interface and it should open new avenues for developing more efficient CZTS-based solar cells.

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Enhanced electrocatalytic hydrogen generation from water via cobalt-doped Cu₂ZnSnS₄ nanoparticles

Abstract: A novel noble metal-free Co-doped CZTS-based nano-electrocatalyst fabricated by employing a sonochemical method for the enhanced hydrogen evolution reaction (HER) and it shows a superior HER performance and exhibits excellent current stability.

Cited by 38 publications

References 66 publications

Facile synthesis of highly porous CuO nanoplates (NPs) for ultrasensitive and highly selective nitrogen dioxide/nitrite sensing

Facile synthesis of highly porous CuO nanoplates (NPs) for ultrasensitive and highly selective nitrogen dioxide/nitrite sensing

Heterostructural CuO–ZnO Nanocomposites: A Highly Selective Chemical and Electrochemical NO₂ Sensor

Interface Structure and Band Alignment of CZTS/CdS Heterojunction: An Experimental and First-Principles DFT Investigation

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Enhanced electrocatalytic hydrogen generation from water via cobalt-doped Cu2ZnSnS4 nanoparticles

Abstract: A novel noble metal-free Co-doped CZTS-based nano-electrocatalyst fabricated by employing a sonochemical method for the enhanced hydrogen evolution reaction (HER) and it shows a superior HER performance and exhibits excellent current stability.

Cited by 38 publications

References 66 publications

Facile synthesis of highly porous CuO nanoplates (NPs) for ultrasensitive and highly selective nitrogen dioxide/nitrite sensing

Facile synthesis of highly porous CuO nanoplates (NPs) for ultrasensitive and highly selective nitrogen dioxide/nitrite sensing

Heterostructural CuO–ZnO Nanocomposites: A Highly Selective Chemical and Electrochemical NO2 Sensor

Interface Structure and Band Alignment of CZTS/CdS Heterojunction: An Experimental and First-Principles DFT Investigation

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Enhanced electrocatalytic hydrogen generation from water via cobalt-doped Cu₂ZnSnS₄ nanoparticles

Heterostructural CuO–ZnO Nanocomposites: A Highly Selective Chemical and Electrochemical NO₂ Sensor