Enhanced photoelectrochemical performance and stability of Si nanowire photocathode with deposition of hematite and carbon

Qu, Yuqi; Li, Feng; Zhang, Peng; Zhao, Liping; Liu, Jing; Song, Xuefeng; Gao, Lian

doi:10.1016/j.apsusc.2018.11.221

Cited by 14 publications

(14 citation statements)

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“…Recently, a 20 nm carbon layer was combined with Fe 2 O 3 nanoparticles to passivate nanostructured Si photocathodes (Figure ). The carbon layer proved to both enhance the physical protection from corrosion and lower the surface charge recombination. On top of their passivation virtues, carbon coatings have also attracted interest for their photothermal/photothermoelectric effect: they undergo significant heating upon illumination, which, in turn, enhances the catalytic activity …”

Section: Nanomaterial-based Systems For Photoelectrochemical Energy C...mentioning

confidence: 99%

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Noble-Metal-Free Multicomponent Nanointegration for Sustainable Energy Conversion

et al. 2021

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Global energy and environmental crises are among the most pressing challenges facing humankind. To overcome these challenges, recent years have seen an upsurge of interest in the development and production of renewable chemical fuels as alternatives to the nonrenewable and high-polluting fossil fuels. Photocatalysis, photoelectrocatalysis, and electrocatalysis provide promising avenues for sustainable energy conversion. Single-and dual-component catalytic systems based on nanomaterials have been intensively studied for decades, but their intrinsic weaknesses hamper their practical applications. Multicomponent nanomaterial-based systems, consisting of three or more components with at least one component in the nanoscale, have recently emerged. The multiple components are integrated together to create synergistic effects and hence overcome the limitation for outperformance. Such higher-efficiency systems based on nanomaterials will potentially bring an additional benefit in balance-of-system costs if they exclude the use of noble metals, considering the expense and sustainability. It is therefore timely to review the research in this field, providing guidance in the development of noble-metal-free multicomponent nanointegration for sustainable energy conversion. In this work, we first recall the fundamentals of catalysis by nanomaterials, multicomponent nanointegration, and reactor configuration for water splitting, CO 2 reduction, and N 2 reduction. We then systematically review and discuss recent advances in multicomponent-based photocatalytic, photoelectrochemical, and electrochemical systems based on nanomaterials. On the basis of these systems, we further laterally evaluate different multicomponent integration strategies and highlight their impacts on catalytic activity, performance stability, and product selectivity. Finally, we provide conclusions and future prospects for multicomponent nanointegration. This work offers comprehensive insights into the development of cost-competitive multicomponent nanomaterial-based systems for sustainable energy-conversion technologies and assists researchers working toward addressing the global challenges in energy and the environment.

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Section: Nanomaterial-based Systems For Photoelectrochemical Energy C...mentioning

confidence: 99%

Section: Nanomaterial-based Systems For Photoelectrochemical Energy C...mentioning

confidence: 99%

Noble-Metal-Free Multicomponent Nanointegration for Sustainable Energy Conversion

et al. 2021

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“…Introducing a conductive protection layer, e.g., carbon, to this structure can prolong the lifetime to several hours by blocking the Si substrate and facilitating the charge transfer. 27 Herein, commercial planar Si was used as a module, coated with a TiO 2 passivation layer and a hematite surface catalyst. We report a stabilization strategy for the TiO 2 /Si photocathode in an alkaline electrolyte by doping Ti into the hematite c-catalyst.…”

Section: ■ Introductionmentioning

confidence: 99%

“…But this strategy has low stability imparted by the direct contact of the bare Si surface with the electrolyte. Introducing a conductive protection layer, e.g., carbon, to this structure can prolong the lifetime to several hours by blocking the Si substrate and facilitating the charge transfer …”

Section: Introductionmentioning

confidence: 99%

Enhancing the Long-Term Photoelectrochemical Performance of TiO₂/Si Photocathodes by Coating of Ti-Doped Mesoporous Hematite

Zheng

Liu

et al. 2021

ACS Appl. Energy Mater.

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Hematite has been demonstrated as a promising surface cocatalyst for photoelectrochemical cathodes in a strong alkaline electrolyte. However, the reliability of hematite-sensitized photocathodes is still inadequate even with an extra TiO 2 passivation layer. Titanium (Ti) doping is shown to significantly enhance the conductivity of hematite. Herein, ordered mesoporous Ti-doped hematite was presynthesized and coated on the surface of TiO 2protected silicon. The obtained composite exhibited greatly improved photoelectrochemical (PEC) performance, where continuous hydrogen production with ∼12 mA cm −2 at 0 V versus a reversible hydrogen electrode for over a week (168 h) with only 5% photocurrent decay in 1.0 M KOH solution was achieved, more than an order of magnitude enhancement in lifetime relative to the pristine hematite. The surface potential investigation suggested a more uniform dispersion of photoelectrons on the surface through Ti doping in hematite particles. The low electronic concentration in the TiO 2 layer avoided the self-reduction of TiO 2 , prolonging the lifetime of the device. This study develops an effective protection mechanism for composite photoelectrodes, providing a promising strategy to protect the photocathode via surface decoration of meticulously tailored catalysts.

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“…Qu et al reported the enhanced PEC performance and stability of SiNWs by depositing hematite and carbon. 18 Yang et al reported the fabrication of a SiNW/Sn 3 O 4 hierarchical heterostructured NW array photoanode by a facile metal-assisted chemical etching method. 19 In this study, SiNWs were synthesized at room temperature (RT) and atmospheric pressure and displayed superior PEC activity and antireflection performance towards the Si wafer.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photoelectrochemical Performance of Si Photocathodes with Deposition of Noble Metal Particles

Zhi

Chen

Zhao

et al. 2021

J. Electron. Mater.

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In this study, an Si nanowire (SiNW) array was prepared on a single-crystal Si wafer by a facile Ag-assisted wet-chemical etching route, followed by deposition of ultrathin Pt nanoparticles for enhancing the photoelectrochemical (PEC) performance. It was demonstrated that the PEC performance of SiNWs was enhanced significantly after Pt modification. A higher photocurrent density of − 12 mA cm −2 was achieved in Pt/SiNWs at − 0.845V versus a reversible hydrogen electrode, which was six times greater than that of bare SiNWs. The mechanism for the enhanced PEC performance was analyzed by combining the electrochemical impedance spectra and Mott-Schottky plots. As a result, the mechanism was attributed to the improved charge transfer ability at the solid electrode/electrolyte interfaces.

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Enhanced photoelectrochemical performance and stability of Si nanowire photocathode with deposition of hematite and carbon

Cited by 14 publications

References 50 publications

Noble-Metal-Free Multicomponent Nanointegration for Sustainable Energy Conversion

Noble-Metal-Free Multicomponent Nanointegration for Sustainable Energy Conversion

Enhancing the Long-Term Photoelectrochemical Performance of TiO₂/Si Photocathodes by Coating of Ti-Doped Mesoporous Hematite

Enhanced Photoelectrochemical Performance of Si Photocathodes with Deposition of Noble Metal Particles

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Enhanced photoelectrochemical performance and stability of Si nanowire photocathode with deposition of hematite and carbon

Cited by 14 publications

References 50 publications

Noble-Metal-Free Multicomponent Nanointegration for Sustainable Energy Conversion

Noble-Metal-Free Multicomponent Nanointegration for Sustainable Energy Conversion

Enhancing the Long-Term Photoelectrochemical Performance of TiO2/Si Photocathodes by Coating of Ti-Doped Mesoporous Hematite

Enhanced Photoelectrochemical Performance of Si Photocathodes with Deposition of Noble Metal Particles

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Enhancing the Long-Term Photoelectrochemical Performance of TiO₂/Si Photocathodes by Coating of Ti-Doped Mesoporous Hematite