Highly efficient and stable Si photocathode with hierarchical MoS2/Ni3S2 catalyst for solar hydrogen production in alkaline media

Fan, Ronglei; Zhou, Ju; Xun, Wei; Cheng, Shaobo; Vanka, Srinivas; Cai, Tianyi; Ju, Sheng; Mi, Zetian; Shen, Mingrong

doi:10.1016/j.nanoen.2020.104631

Cited by 61 publications

(66 citation statements)

References 44 publications

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“…[ 28 ] Additionally, the peaks at ≈168.1 eV were associated with the SO species because of oxidation in the air. [ 41 ] Similar to the analyses of the Ni 2p peaks, the main peaks in NiS 2 matched with those of S 2 2− , although the characteristic peaks of S 2− in NiS demonstrated the leading role. Moreover, the peaks, S 2− and S 2 2− , in the NNH sample were well‐matched regarding their intensities, thus demonstrating the equal coexistence of the NiS 2 and NiS phases in the as‐prepared NNH, and this is consistent with the aforementioned characteristics.…”

Section: Resultssupporting

confidence: 56%

Engineering Heterogeneous NiS₂/NiS Cocatalysts with Progressive Electron Transfer from Planar p‐Si Photocathodes for Solar Hydrogen Evolution

Yang

et al. 2021

Small Methods

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The sluggish transfer of electrons from a planar p‐type Si (p‐Si) semiconductor to a cocatalyst restricts the activity of photoelectrochemical (PEC) hydrogen evolution. To overcome such inefficiency, an elegant interphase of the semiconductor/cocatalyst is generally necessary. Hence, in this work, a NiS2/NiS heterojunction (NNH) is prepared in situ and applied to a planar p‐Si substrate as a cocatalyst to achieve progressive electron transfer. The NNH/Si photocathode exhibits an onset potential of +0.28 V versus reversible hydrogen electrode (VRHE) and a photocurrent density of 18.9 mA·cm−2 at 0 VRHE, as well as a 0.9% half‐cell solar‐to‐hydrogen efficiency, which is much superior compared with those of NiS2/Si and NiS/Si photocathodes. The enhanced performance for NNH/Si is attributed to the contact between the sectional n‐type semiconducting NNH and the planar p‐Si semiconductor through a p‐Si/n‐NiS/n‐NiS2 manner that functions as a local pn‐junction to promote electron transfer. Thus, the photogenerated electron is transferred from p‐Si to n‐NiS within NNH as the progressive medium, followed by to Ni2+ and/or S22− of the defect‐rich n‐NiS2 phase as the key active sites. This systematic work may pave the way for planar Si‐based PEC applications of heterogeneous metal sulfide cocatalysts through the progressive transfer of electrons.

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Section: Resultssupporting

confidence: 56%

Engineering Heterogeneous NiS₂/NiS Cocatalysts with Progressive Electron Transfer from Planar p‐Si Photocathodes for Solar Hydrogen Evolution

Yang

et al. 2021

Small Methods

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“…Besides the Nyquist plots, additional valuable information of carrier lifetime can be obtained from the Bode phase plots. Generally, a lower characteristic peak frequency in Bode phase plots indicates a longer electron lifetime . As shown in Figure S22 in the Supporting Information, the Mo:NiFe‐LDH‐SR/NiO x /Ni photoanode exhibited a lower characteristic peak frequency (≈1.3 Hz) than the NiFe‐LDH/NiO x /Ni/Si (≈2.6 Hz) and NiO x /Ni/Si photoanodes (≈13.6 Hz), indicating the longer electron lifetime and, therefore, lower carrier recombination rate.…”

Section: Resultsmentioning

confidence: 99%

Integration of Oxygen‐Vacancy‐Rich NiFe‐Layered Double Hydroxide onto Silicon as Photoanode for Enhanced Photoelectrochemical Water Oxidation

Chen

Fan

et al. 2020

ChemSusChem

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Photoelectrochemical (PEC) water splitting has the potential to efficiently convert intermittent solar energy into storable hydrogen fuel. However, poor charge separation and transfer ability as well as sluggish surface oxygen evolution reaction (OER) kinetics of the photoelectrode severely hinder the advance in PEC performance. Herein, a facile electrodeposition method was used to integrate Mo‐doped NiFe‐layered double hydroxide onto a NiOx/Ni‐protected Si photoanode for enhanced PEC water oxidation. Mo doping contributed to an increased amount of oxygen vacancies, whereas a dynamic surface self‐reconstruction was induced by Mo leaching under PEC OER conditions. This led to enhanced PEC performance with an onset potential of 0.87 V vs. reversible hydrogen electrode (RHE), a photocurrent density of 39.3 mA cm−2 at 1.23 V vs. RHE, a fill factor of 0.38, and a solar‐to‐oxygen conversion efficiency of 5.3 %, along with a stability of 130 h continuous PEC reaction. The performance was superior to that of the undoped NiFe‐LDH/NiOx/Ni/Si (4.3 %), which was attributed to the elevated interface charge separation, fast charge transfer, and accelerated OER kinetics.

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“…The resulting morphologies are more dependent on the substrate than on the electrolyte and the potentialcurrent-time program: continuous potentiostatic deposition on carbon fiber yields FeP nanocubes [51], whereas nanocrystalline films on Ni and Cu substrates [56,57] can be obtained by potentiostatic, galvanostatic or cyclic voltammetry methods. In addition, cobalt [55], nickelcobalt [53], or molybdenum-nickel [54] sulfides have also been deposited on nickel surfaces.…”

Section: Electrodeposition For Water Splitting Applicationsmentioning

confidence: 99%

Electrodeposition of nanostructured catalysts for electrochemical energy conversion: Current trends and innovative strategies

López

Ustarroz

2021

Current Opinion in Electrochemistry

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This review discusses the latest advances in electrodeposition of nanostructured catalysts for electrochemical energy conversion: fuel cells, water splitting and carbon dioxide electroreduction. The method excels at preparing efficient and durable nanostructured materials, such as nanoparticles, single atom clusters, hierarchical bifunctional combinations of hydroxides, selenides, phosphides, etc. Yet, in most cases, chemical composition cannot be decoupled from catalyst morphology. This compromises the rational design of electrodeposition procedures since performance indicators depend on both morphology and surface chemistry. We expect electrodeposition will keep unraveling its potential as the preferred method for electrocatalyst synthesis once a deeper understanding of the electrochemical growth process is combined with complex chemistries to have control of the morphology and the surface composition of complex (bifunctional) electrocatalysts.

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Highly efficient and stable Si photocathode with hierarchical MoS2/Ni3S2 catalyst for solar hydrogen production in alkaline media

Cited by 61 publications

References 44 publications

Engineering Heterogeneous NiS₂/NiS Cocatalysts with Progressive Electron Transfer from Planar p‐Si Photocathodes for Solar Hydrogen Evolution

Engineering Heterogeneous NiS₂/NiS Cocatalysts with Progressive Electron Transfer from Planar p‐Si Photocathodes for Solar Hydrogen Evolution

Integration of Oxygen‐Vacancy‐Rich NiFe‐Layered Double Hydroxide onto Silicon as Photoanode for Enhanced Photoelectrochemical Water Oxidation

Electrodeposition of nanostructured catalysts for electrochemical energy conversion: Current trends and innovative strategies

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Highly efficient and stable Si photocathode with hierarchical MoS2/Ni3S2 catalyst for solar hydrogen production in alkaline media

Cited by 61 publications

References 44 publications

Engineering Heterogeneous NiS2/NiS Cocatalysts with Progressive Electron Transfer from Planar p‐Si Photocathodes for Solar Hydrogen Evolution

Engineering Heterogeneous NiS2/NiS Cocatalysts with Progressive Electron Transfer from Planar p‐Si Photocathodes for Solar Hydrogen Evolution

Integration of Oxygen‐Vacancy‐Rich NiFe‐Layered Double Hydroxide onto Silicon as Photoanode for Enhanced Photoelectrochemical Water Oxidation

Electrodeposition of nanostructured catalysts for electrochemical energy conversion: Current trends and innovative strategies

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Engineering Heterogeneous NiS₂/NiS Cocatalysts with Progressive Electron Transfer from Planar p‐Si Photocathodes for Solar Hydrogen Evolution

Engineering Heterogeneous NiS₂/NiS Cocatalysts with Progressive Electron Transfer from Planar p‐Si Photocathodes for Solar Hydrogen Evolution