Engineering ultrafine NiS cocatalysts as active sites to boost photocatalytic hydrogen production of MgAl layered double hydroxide

Chen, Jingshuai; Wang, Chao; Zhang, Yun; Guo, Zhenzhen; Luo, Yuxin

doi:10.1016/j.apsusc.2019.144999

Cited by 55 publications

(22 citation statements)

References 27 publications

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“…For instance, Chen et al synthesized the MgAl–LDH/ultrafine NPs NiS photocatalysts having highly efficient photocatalytic hydrogen production. [ 38 ] Luo et al constructed NiS/TiO 2 nanoflower‐like composites with high efficient charge separation and transfer that achieved 98% degradation of methyl orange within 20 min, which was much higher than the degradation by pure TiO 2 . [ 39 ] More importantly, NiS with metallic properties constructs ohmic junctions on the 3D ZnIn 2 S 4 surface to prevent reverse carrier transport, further improving carrier separation and migration efficiency.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…219 In different studies, it has been reported that the addition of nickel sulfide (NiS) as a co-catalyst positively enhances the photocatalytic activity of the MgAl-LDH. 59 The presence of NiS increase the photocatalytic efficiency of the composite up to 35.8 μmol g À1 h À1 compared to pure MgAl-LDH. NiS has been denoted to exhibit a narrower band gap, which their integration was believed to significantly enhance the solar absorption of MgAl-LDH without altering the structural properties.…”

Section: Al-based Ldhmentioning

confidence: 96%

“…80 Besides, the presence of Mg cations in the brucite layer of LDH was noted to improve their photostability and is responsible for improving the photocatalytic performances as observed in various Mg-based LDH photocatalysts reported. 59,60,81 In addition, the attribution of Mg-based LDH in photocatalytic hydrogen production can be further ameliorated through incorporation with other divalent and trivalent cations forming bimetallic and trimetallic Mgbased LDH. This gives a substantial improvement in their structural, optical, and electronic properties.…”

Section: Mg-based Ldhmentioning

confidence: 99%

“…94 In particular, after the photon absorption, the electron-hole pairs were generated at the VB of MgCr The development in the heterojunction formation on Mg-based LDH composite includes the heterojunction with acidified g-C 3 N 4 , 81 TiO 2 , 96,97 CdS, 98 MOS 2 , 99 and NiS. 59 The study found that coupling the MgAl-LDH with acidified g-C 3 N 4 (CN-H) successfully shifts the solar absorption spectrum from 365 nm of pure MgAl-LDH towards 465 nm. It was being disclosed that reacting pure g-C 3 N 4 under acid treatment however results in a reduced absorption spectrum at the range of 40 to 50 nm.…”

Section: Mg-based Ldhmentioning

confidence: 99%

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Recent developments in layered double hydroxide structures with their role in promoting photocatalytic hydrogen production: A comprehensive review

Sherryna

Tahir

2021

Intl J of Energy Research

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Layered double hydroxides (LDHs) have received scientific attractions due to their unique two-dimensional (2D) structure, band gap tunability, and compositional flexibility, leading to the facile incorporation of the metal species into their layered structure. The main objective of this review is to explore the current advancement of LDH-based photocatalysts for photocatalytic hydrogen production by focusing on the role of divalent and trivalent metal incorporations and their efficiency enhancement. Firstly, the mechanism of photocatalysis and its thermodynamics has been explicated to gain basic understanding and fundamentals. Secondly, a brief introduction to the overview of LDH photocatalysts with special attention to the effects of cationic incorporations on the optical properties and computational study towards the electronic density has been demonstrated. Besides, the thermal stability of LDH is briefly discussed, focusing on the effects of temperature towards the conversion into mixed-metal oxide (MMO). Next, the classification of LDH based on divalent and trivalent cationic elements and their role in the brucite layer of LDH are systematically discussed. Attention is given to the mechanistic properties of the extensively studied metals, such as Mg, Ni, Zn, Co, Cr, Fe, V and Al, with the efficiency enhancements through various engineering aspects are demonstrated. The overview summary on the efficient design of LDH is elucidated to provide a deep understanding for improving their photocatalytic properties. Lastly, the future perspectives and recommendations are discussed to provide new insight into the potential of LDH and render them a notable place in solar energy applications.

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“…Zheng et al 22 reported MoS 2 /MgAl LDH photocatalyst prepared by a hydrothermal method for methyl orange degradation, which exhibits increased full-spectrum response (300−800 nm) and charge transfer efficiency. Chen et al 23 prepared MgAl LDH/ NiS photocatalyst for photocatalytic hydrogen production with enhanced visible light absorption and charge transfer efficiency.…”

Section: Introductionmentioning

confidence: 99%

Visible Light-Driven CO₂ Photocatalytic Reduction by Co-porphyrin-Coupled MgAl Layered Double-Hydroxide Composite

Liu

Zhou

et al. 2021

Energy Fuels

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CO2 photocatalytic reduction into fuels has provided a sustainable strategy for the mitigation of energy crisis and environmental problems. MgAl layered double hydroxide (LDH), with the advantages of low cost and wide employment in commercial applications, has been regarded as a promising catalyst for CO2 photocatalytic conversion. In order to improve the visible light absorption and charge separation efficiency of MgAl LDH, metalloporphyrin (Co-TCPP) was used for the surface modification of MgAl LDH to prepare the noble metal-free nanocomposite (Co-TCPP@LDH). The synthesized catalyst exhibits increased photocatalytic activity under visible light irradiation compared with pure MgAl LDH. Experimental results show that 20% Co-TCPP@LDH exhibits the highest photocatalytic activity with the CO evolution rate of 0.40 μmol gcat –1, which is about 4.1 times and 3.3 times higher than those of MgAl LDH and Co-TCPP. The excellent visible light absorption of porphyrin molecules can effectively widen the light absorption edge of the heterogeneous photocatalyst to the low energy region (600–800 nm). The intramolecular heterogeneous interface and the highly dispersed cobalt metal sites can facilitate charge transport and separation.

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Engineering ultrafine NiS cocatalysts as active sites to boost photocatalytic hydrogen production of MgAl layered double hydroxide

Cited by 55 publications

References 27 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 developments in layered double hydroxide structures with their role in promoting photocatalytic hydrogen production: A comprehensive review

Visible Light-Driven CO₂ Photocatalytic Reduction by Co-porphyrin-Coupled MgAl Layered Double-Hydroxide Composite

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Engineering ultrafine NiS cocatalysts as active sites to boost photocatalytic hydrogen production of MgAl layered double hydroxide

Cited by 55 publications

References 27 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 developments in layered double hydroxide structures with their role in promoting photocatalytic hydrogen production: A comprehensive review

Visible Light-Driven CO2 Photocatalytic Reduction by Co-porphyrin-Coupled MgAl Layered Double-Hydroxide Composite

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Product

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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

Visible Light-Driven CO₂ Photocatalytic Reduction by Co-porphyrin-Coupled MgAl Layered Double-Hydroxide Composite