Hydrothermally obtained type-Ⅱ heterojunction nanostructures of In2S3 / TiO2 for remarkably enhanced photoelectrochemical water splitting

Park, Jongseong; Lee, Tae Hyung; Kim, Chang‐Yeon; Lee, Sol A; Choi, Min‐Ju; Kim, Hwiho; Jin, Can; Lim, Jongwoo; Jang, Ho Won

doi:10.1016/j.apcatb.2021.120276

Cited by 110 publications

(33 citation statements)

References 55 publications

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“…

{normalN}_{normalD} = \frac{1.41 \times 10^{32} false(cm \times {normalF}^{- 2} \times {normalV}^{- 1} false)}{ε_{r} \times {normalA}^{2} false({cm}^{4} false) \times slope false({normalF}^{- 2} \times {normalV}^{- 1} false)}

where N D represents the carrier concentration,

ε_{r}

is dielectric constant of semiconductor (for ZnIn 2 S 4 , 4.7 [ 54 ] ),

slope

is the slope of M–S curve, and A is the area of the working electrode. [ 55 ] In addition, since the amount of NiS is relatively small, its effect on the dielectric constant is negligible. As shown in Figure 9 a, the slope of M–S curve is 1.15 × 10 12 for pure flower ball–like ZnIn 2 S 4 and 1.65 × 10 11 for ZnIn 2 S 4 –2%NiS composite photocatalyst.…”

Section: Resultsmentioning

confidence: 99%

“…The flat band potentials of pure ZnIn 2 S 4 was tested by the Mott-Schottky plot. [54,55] As shown in Figure S4, Supporting Information, the flat band potentials of ZnIn 2 S 4 was À1.17 eV (versus Ag/AgCl), which the conduction band (CB) is converted to À1.07 V (versus normal hydrogen electrode (NHE)). [58] The valence band (VB) of ZnIn 2 S 4 is calculated by an empirical formula E CB ¼ E VB À E g .…”

Section: Photocatalytic Co 2 Reduction Mechanismmentioning

confidence: 99%

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NiS Cocatalyst–Modified ZnIn₂S₄ as Ohmic‐Junction Photocatalyst for Efficient Conversion of CO₂

et al. 2022

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Improved photogenerated carrier separation efficiency is of importance for improving photocatalytic activity. Herein, the photocatalytic CO2 reduction of a 3D/0D ZnIn2S4/NiS ohmic‐junction photocatalyst under simulated sunlight is studied. The ZnIn2S4–2%NiS sample has the best excellent photoreduction CO2 performance facilitated by triethanolamine (TEOA) reagents, the ZnIn2S4–2%NiS sample with a CO yield of 12.63 μmol g−1 h−1, which is two times that for pure ZnIn2S4 (6.37 μmol g−1 h−1). It is demonstrated that NiS nanoparticles not only improve the efficiency of electron generation and charge separation by constructing a tight contact ohmic‐junction, but also act as a cocatalyst to extend the photoreaction range and lower the reaction barrier, which effectively accelerates the photocatalytic reduction reaction. Additionally, the 3D structure of ZnIn2S4 has an excellent specific surface area that facilitates the dispersion of NiS. The generation, separation, and migration of photogenerated electron holes are studied from the kinetics perspective through transient photocurrent response, linear sweep voltammetry curve and photoluminescence spectroscopy. In situ Fourier transform infrared spectroscopy is applied to study the CO2 photoreduction process. Herein, the important role of cocatalyst and ohmic‐junction in improving photocatalytic activity is revealed and a new idea for the construction of efficient photocatalysts is provided.

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“…

{normalN}_{normalD} = \frac{1.41 \times 10^{32} false(cm \times {normalF}^{- 2} \times {normalV}^{- 1} false)}{ε_{r} \times {normalA}^{2} false({cm}^{4} false) \times slope false({normalF}^{- 2} \times {normalV}^{- 1} false)}

where N D represents the carrier concentration,

ε_{r}

is dielectric constant of semiconductor (for ZnIn 2 S 4 , 4.7 [ 54 ] ),

slope

Section: Resultsmentioning

confidence: 99%

Section: Photocatalytic Co 2 Reduction Mechanismmentioning

confidence: 99%

NiS Cocatalyst–Modified ZnIn₂S₄ as Ohmic‐Junction Photocatalyst for Efficient Conversion of CO₂

et al. 2022

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“…The study of CdS and other materials showed that although the construction of semiconductor heterojunctions can promote the bulk separation of photogenerated carriers and greatly improve the device performance, heterojunctions are difficult to construct with metal sulfides. Because of their narrow Eg and the position of their energy band, sulfides often need to be used as the outer layer material of the heterojunction (i.e., the part in contact with the electrolyte) [170]. This energy band structure leads to a large accumulation of photogenerated holes on the surface of metal sulfides, resulting in increasingly serious photocorrosion.…”

Section: In2s3mentioning

confidence: 99%

Recent research progress on operational stability of metal oxide/sulfide photoanodes in photoelectrochemical cells

Meng¹,

Li²

2022

Nano Research Energy

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Photoelectrochemical (PEC) water splitting can directly convert solar energy into hydrogen energy for storage, effectively ending the energy crisis and solving environmental problems. With their modification by many researchers, photoanodes have rapidly improved in PEC performance. Nevertheless, the poor stability of PEC water-splitting devices has not been effectively corrected, seriously hindering their practical application and large-scale commercialization. In this review, we provide a detailed introduction to the photocorrosion mechanism of photoanodes and characterizations of stability, summarizing the current research progress on the stability of metal oxide/sulfide photoanode materials. According to the specificity of each semiconductor, the corrosion mechanism and modification strategy of each photoanode are discussed in detail. Finally, we summarize the deficiencies in the current stability research and propose influencing factors and possible solutions that need to be considered in the photocorrosion research field of photoanodes. This review can provide a reference for the stability research of photoanodes based on metal oxides and sulfides, especially for the design of efficient and stable metal sulfide-based photoanodes.

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“…102 Defect engineering and heterojunction to enhance light harvesting of TiO 2 with a large band gap of 3.2 eV have been mainly used. 103,104 In addition, since TiO 2 can be easily synthesized by the hydrothermal method that can make excellent crystallinity, many efforts have been made to control the crystal facet with high photoactivity. 105–107 As shown in Fig.…”

Section: Trends Of Facet and Phase Engineering For Water Splitting Sy...mentioning

confidence: 99%

Crystal facet and phase engineering for advanced water splitting

et al. 2022

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Hydrothermally obtained type-Ⅱ heterojunction nanostructures of In2S3 / TiO2 for remarkably enhanced photoelectrochemical water splitting

Cited by 110 publications

References 55 publications

NiS Cocatalyst–Modified ZnIn₂S₄ as Ohmic‐Junction Photocatalyst for Efficient Conversion of CO₂

NiS Cocatalyst–Modified ZnIn₂S₄ as Ohmic‐Junction Photocatalyst for Efficient Conversion of CO₂

Recent research progress on operational stability of metal oxide/sulfide photoanodes in photoelectrochemical cells

Crystal facet and phase engineering for advanced water splitting

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Hydrothermally obtained type-Ⅱ heterojunction nanostructures of In2S3 / TiO2 for remarkably enhanced photoelectrochemical water splitting

Cited by 110 publications

References 55 publications

NiS Cocatalyst–Modified ZnIn2S4 as Ohmic‐Junction Photocatalyst for Efficient Conversion of CO2

NiS Cocatalyst–Modified ZnIn2S4 as Ohmic‐Junction Photocatalyst for Efficient Conversion of CO2

Recent research progress on operational stability of metal oxide/sulfide photoanodes in photoelectrochemical cells

Crystal facet and phase engineering for advanced water splitting

Contact Info

Product

Resources

About

NiS Cocatalyst–Modified ZnIn₂S₄ as Ohmic‐Junction Photocatalyst for Efficient Conversion of CO₂

NiS Cocatalyst–Modified ZnIn₂S₄ as Ohmic‐Junction Photocatalyst for Efficient Conversion of CO₂