g-C3N4 nanosheets functionalized silicon nanowires hybrid photocathode for efficient visible light induced photoelectrochemical water reduction

Gopalakrishnan, S.; Bhalerao, G. M.; Jeganathan, K.

doi:10.1016/j.jpowsour.2018.12.034

Cited by 23 publications

(17 citation statements)

References 43 publications

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“…In addition, the absence of Si NW lattice fringes suggested that the g-C 3 N 4 NSs covered the Si NW surfaces. However, g-C 3 N 4 NS lattice fringes are not visible, owing to its porous honeycomb structure . The consequential morphology clearly ensures that the SrTiO 3 NPs coupled with g-C 3 N 4 NSs functionalized with a Si NW hybrid structure does not make contact with the electrolyte directly, which is beneficial to evade photocorrosion of host materials.…”

Section: Results and Discussionmentioning

confidence: 99%

SrTiO₃ NPs/g-C₃N₄ NSs Coupled Si NWs based Hybrid Photocathode for Visible Light Driven Photoelectrochemical Water Reduction

Gopalakrishnan

Bhalerao

Jeganathan

2019

ACS Sustainable Chem. Eng.

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We report a novel class of silicon nanowire-based hybrid heterostructures consisting of perovskite SrTiO3 nanoparticle-coupled g-C3N4 nanosheets as a promising photocathode for the solar water reduction process. The SrTiO3 nanoparticle-coupled g-C3N4 nanosheets as the interfacial layer with Si NWs provides excellent visible light photocatalytic activity for the proton reduction processes. The hybrid heterojunction photocathode for the water reduction reaction at neutral pH exhibits the highest photocurrent density of 28 mA cm–2, along with a photon-to-current efficiency of 5.4% under visible light irradiation. As a result, the hybrid photocathode shows an unprecedented enhancement in the low photocurrent onset potential (606 mV vs RHE) and hydrogen evolved rate of 18 μmole cm–2 by increasing the interfacial charge carrier separation and the migration process at the photocathode/electrolyte interface. Moreover, the electrochemical impedance spectroscopy studies suggest that the hybrid photocathode holds an impressive charge transfer resistance reduction with an extended lifetime of photoexcited electrons, owing to the well-aligned photocathode/electrolyte interface. The improved photoelectrochemical performances can be ascribed to the high in-built electrostatic field in the interface, and the photocathode is secure from electrolytes by wrapping in an external hybrid sheath. The proposed hybrid Si NWs heterostructure photocathode is expected to provide new opportunities for a very low cost solar energy utilization platform toward a solar-assisted water reduction process.

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Section: Results and Discussionmentioning

confidence: 99%

SrTiO₃ NPs/g-C₃N₄ NSs Coupled Si NWs based Hybrid Photocathode for Visible Light Driven Photoelectrochemical Water Reduction

Gopalakrishnan

Bhalerao

Jeganathan

2019

ACS Sustainable Chem. Eng.

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“…Generally, platinum (Pt) and other noble metals are considered as the most effective HER cocatalysts. , However, they suffer from the scarcity and high cost, which limit their practical application in PEC water splitting. Therefore, non-noble metals − and other metal-free materials − have been extensively explored as alternative cocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a Three-Dimensional Bionic Si/TiO₂/MoS₂ Photoelectrode for Efficient Solar Water Splitting

Liu

Wang

et al. 2020

ACS Appl. Energy Mater.

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Solar water splitting for hydrogen production using semiconductors is widely accepted as one of the most promising routes to relieve the energy crisis and environmental issues caused by the excessive use of fossil fuels. However, the solar to hydrogen conversion efficiency of a Si photoelectrode is suppressed by overpotential, high reflectance, and/or instability in liquid electrolytes. Here, the Si/TiO 2 /MoS 2 photoelectrode with three-dimensional (3D) bionic structure has been fabricated, which can protect Si from corrosion and reduce the reflection of the electrode surface. The TiO 2 nanorods not only reduce the sudden change in refractive index from the electrolyte to the Si surface but also improve the problem of weak interface coupling between MoS 2 and Si, improving the stability of the photoelectrode. The optimized photoelectrode in this work exhibits a photocurrent density of −0.24 mA/ cm 2 at 0 V vs RHE (reversible hydrogen electrode), an onset potential of 0.42 V vs RHE, and stability for more than 8 h under 1 sun of simulated solar illumination. The ternary heterojunction structure of Si/TiO 2 /MoS 2 not only reduces its reflection but also improves its carrier separation and transport, thereby improving the photoelectrochemical performance of the photoelectrode.

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“…75,79,80 The photocorrosion of the material can be reduced by the use of relevant catalysts which improves charge transfer kinetics (i.e., kHER or kOER) at the solid/liquid interface, and consequently reduces the surface oxidation. 80,81 However, this strategy cannot prevent photoelectrodes from degradation during the night time, where the materials do not have the benefit of a photovoltage to provide a stabilizing anodic or cathodic bias. 82 Kinetic enhancement via morphology modifications can also be an approach for improving the stability of photoelectrodes.…”

Section: Stability Of Photoelectrode-electrolyte Junctionsmentioning

confidence: 99%

“…SiO2 and H2SiO3, etc., whereas it decomposes into H2SiO4 2-under strong alkaline conditions. 81 III-V semiconductors (GaAs, GaInP2 and others), which give photo-absorber materials with the most efficient solarto-hydrogen conversion efficiencies (STH) reported so far (14%), are also prone to chemical decomposition in strong acid, but this process takes place much more slowly. 58 Using metal oxides with high intrinsic chemical stability is also a widely used strategy, however, as described earlier, the relatively low PEC performance of those metal oxides restricts their application in practical water splitting systems.…”

Section: Stability Of Photoelectrode-electrolyte Junctionsmentioning

confidence: 99%

“…From recent literature data, the results indicated a good agreement of the XRD patterns of the g-C3N4 bulk, nanosheets and nanowires. [80][81][82][83][84] In Figure 4 [85][86][87] In addition, Roger et al 88 showed the XRD pattern of a blank FTO substrate given for comparison showing that the majority of the FTO reflections are overlapping with the cobalt sulfide peaks.…”

Section: Surface Characterizationmentioning

confidence: 99%

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Tandem Cu2O-covered silicon micropillar photocathodes for solar-to-fuel devices

Kunturu

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g-C3N4 nanosheets functionalized silicon nanowires hybrid photocathode for efficient visible light induced photoelectrochemical water reduction

Cited by 23 publications

References 43 publications

SrTiO₃ NPs/g-C₃N₄ NSs Coupled Si NWs based Hybrid Photocathode for Visible Light Driven Photoelectrochemical Water Reduction

SrTiO₃ NPs/g-C₃N₄ NSs Coupled Si NWs based Hybrid Photocathode for Visible Light Driven Photoelectrochemical Water Reduction

Fabrication of a Three-Dimensional Bionic Si/TiO₂/MoS₂ Photoelectrode for Efficient Solar Water Splitting

Tandem Cu2O-covered silicon micropillar photocathodes for solar-to-fuel devices

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g-C3N4 nanosheets functionalized silicon nanowires hybrid photocathode for efficient visible light induced photoelectrochemical water reduction

Cited by 23 publications

References 43 publications

SrTiO3 NPs/g-C3N4 NSs Coupled Si NWs based Hybrid Photocathode for Visible Light Driven Photoelectrochemical Water Reduction

SrTiO3 NPs/g-C3N4 NSs Coupled Si NWs based Hybrid Photocathode for Visible Light Driven Photoelectrochemical Water Reduction

Fabrication of a Three-Dimensional Bionic Si/TiO2/MoS2 Photoelectrode for Efficient Solar Water Splitting

Tandem Cu2O-covered silicon micropillar photocathodes for solar-to-fuel devices

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Resources

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SrTiO₃ NPs/g-C₃N₄ NSs Coupled Si NWs based Hybrid Photocathode for Visible Light Driven Photoelectrochemical Water Reduction

SrTiO₃ NPs/g-C₃N₄ NSs Coupled Si NWs based Hybrid Photocathode for Visible Light Driven Photoelectrochemical Water Reduction

Fabrication of a Three-Dimensional Bionic Si/TiO₂/MoS₂ Photoelectrode for Efficient Solar Water Splitting