Nanomaterials for photocatalytic hydrogen production: from theoretical perspectives

Bhatt, Mahesh Datt; Lee, Jin Ho

doi:10.1039/c7ra03435k

Cited by 59 publications

(24 citation statements)

References 239 publications

(181 reference statements)

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“…The abundance of water and sunlight as affordable sources offers a good alternative for hydrogen generation. Hence, photocatalytic water splitting is considered to have a potential for sustainable production of hydrogen that can be employed in different scales of hydrogen generators [4]. For achieving high conversion efficiency in solar water splitting, photocatalysts should have some critical features such as high absorption of visible light, low charge recombination, and high surface reaction [5].…”

Section: Introductionmentioning

confidence: 99%

A review of recent advances in water-gas shift catalysis for hydrogen production

2020

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The water-gas shift reaction (WGSR) is an intermediate reaction in hydrocarbon reforming processes, considered one of the most important reactions for hydrogen production. Here, water and carbon monoxide molecules react to generate hydrogen and carbon dioxide. From the thermodynamics aspect, pressure does not have an impact, whereas low-temperature conditions are suitable for high hydrogen selectivity because of the exothermic nature of the WGSR reaction. The performance of this reaction can be greatly enhanced in the presence of suitable catalysts. The WGSR has been widely studied due do the industrial significance resulting in a good volume of open literature on reactor design and catalyst development. A number of review articles are also available on the fundamental aspects of the reaction, including thermodynamic analysis, reaction condition optimization, catalyst design, and deactivation studies. Over the past few decades, there has been an exceptional development of the catalyst characterization techniques such as near-ambient x-ray photoelectron spectroscopy (NA-XPS) and in situ transmission electron microscopy (in situ TEM), providing atomic level information in presence of gases at elevated temperatures. These tools have been crucial in providing nanoscale structural details and the dynamic changes during reaction conditions, which were not available before. The present review is an attempt to gather the recent progress, particularly in the past decade, on the catalysts for lowtemperature WGSR and their structural properties, leading to new insights that can be used in the future for effective catalyst design. For the ease of reading, the article is divided into subsections based on metals (noble and transition metal), oxide supports, and carbon-based supports. It also aims at providing a brief overview of the reaction conditions by including a table of catalysts with synthesis methods, reaction conditions, and key observations for a quick reference. Based on our study of literature on noble metal catalysts, atomic Pt substituted Mn 3 O 4 shows almost full CO conversion at 260°C itself with zero methane formation. In the case of transition metals group, the inclusion of Cu in catalytic system seems to influence the CO conversion significantly, and in some cases, with CO conversion improvement by 65% at 280°C. Moreover, mesoporous ceria as a catalyst support shows great potential with reports of full CO conversion at a low temperature of 175°C.

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Section: Introductionmentioning

confidence: 99%

A review of recent advances in water-gas shift catalysis for hydrogen production

2020

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“…Secondly, the overpotential for direct hydrogen evolution at MoS 2 active sites is high, thus the rate is relatively slow compared to some others with noble metals which can reduces this overpotential. It is generally believed that, in EY sensitized hydrogen generation system, the charge transfer is mainly undertaken by 3 leading to its photobleaching and the loss of photoactivity.…”

Section: Dye Sensitized Hydrogen Generationmentioning

confidence: 99%

“…[1][2][3] To perform the hydrogen evolution reaction, the photocatalytic system usually consists of a highly efficient photosensitizer (PS), a hydrogen evolution catalyst and a sacricial electron donor. There have been a large number of reports on Ru complexes as PSs.…”

Section: Introductionmentioning

confidence: 99%

Graphene decorated MoS₂for eosin Y-sensitized hydrogen evolution from water under visible light

et al. 2017

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Some two-dimensional nanomaterials, such as graphene and molybdenum disulfide, are presently being intensively investigated due to their excellent and unique performances. In the field of photocatalysis, MoS 2 is considered as a promising alternative to noble metal Pt for the hydrogen evolution reaction (HER). However, its poor electrical conductivity restricts its catalytic activity in the HER. In this work, MoS 2 was modified with graphene (G) by a simple hydrothermal method. The prepared G/MoS 2 composite was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The results show that graphene modification does not influence the crystal phase of MoS 2 , but makes the latter more dispersed. The HER performance of G/MoS 2 was evaluated using eosin Y (EY) as a photosensitizer, and triethanolamine (TEOA) as a sacrificial electron donor under visible-light irradiation (l > 420 nm, 250 W high pressure Hg lamp as light source).The EY sensitized G/MoS 2 composite displays enhanced hydrogen evolution in terms of not only activity but also stability. The average HER activity (9.1 mmol h À1) is three times that of EY sensitized pure MoS 2 over 10 h. It is believed that the incorporation of graphene enhances the charge transfer ability and retards the self-degradation path of EYc À , ultimately improving the HER.

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“…Generally speaking, hydrogen can be produced by photocatalysis, photoelectrochemistry, and thermocatalysis, and so on 11,12 . Among them, photocatalytic technology can directly convert the pervasive solar energy into chemical energy to produce hydrogen, and the solar energy is enormous in reserves 13‐16 . Consequently, it is regarded as the most promising technology to replace some traditional technologies.…”

Section: Introductionmentioning

confidence: 99%

Recent progresses in photocatalytic hydrogen production: design and construction of Ni‐based cocatalysts

Liu

Zhuang

2020

Int J Energy Res

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Summary Up to now, much effort has focused on developing the highly efficiency composite photocatalysts by introducing cocatalysts in the photocatalytic hydrogen production reaction, because the proper cocatalysts can reduce activation energy, provide active sites, and suppress the reverse reaction. The transition metal nickel and its compounds acting as cocatalyst have received intensive attention because of their structural stability, facile preparation, and high performance in hydrogen evolution reaction, and are expected to replace the function of noble metals. This review emphasizes on the latest progresses that design and construction of composite photocatalyst using Ni‐based cocatalyst for enhanced hydrogen production, such as metal nickel, nickel sulfide, and nickel phosphide, will be presented. Then, some preparation strategies and influence factors of Ni‐based cocatalysts on enhanced photocatalytic hydrogen production are elucidated in detail. Finally, some challenge and perspective on the highly active cocatalysts in the area of photocatalytic hydrogen production from water splitting are also given.

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Nanomaterials for photocatalytic hydrogen production: from theoretical perspectives

Abstract: To overcome the increasing demand of energy worldwide and global warming due to CO2emissions from the use of traditional fuel sources, renewable and clean energy sources are in high demand.

Cited by 59 publications

References 239 publications

A review of recent advances in water-gas shift catalysis for hydrogen production

A review of recent advances in water-gas shift catalysis for hydrogen production

Graphene decorated MoS₂for eosin Y-sensitized hydrogen evolution from water under visible light

Recent progresses in photocatalytic hydrogen production: design and construction of Ni‐based cocatalysts

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Nanomaterials for photocatalytic hydrogen production: from theoretical perspectives

Abstract: To overcome the increasing demand of energy worldwide and global warming due to CO2emissions from the use of traditional fuel sources, renewable and clean energy sources are in high demand.

Cited by 59 publications

References 239 publications

A review of recent advances in water-gas shift catalysis for hydrogen production

A review of recent advances in water-gas shift catalysis for hydrogen production

Graphene decorated MoS2for eosin Y-sensitized hydrogen evolution from water under visible light

Recent progresses in photocatalytic hydrogen production: design and construction of Ni‐based cocatalysts

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Graphene decorated MoS₂for eosin Y-sensitized hydrogen evolution from water under visible light