Recent progress and challenges in photocatalytic water splitting using layered double hydroxides (LDH) based nanocomposites

Shandilya, Pooja; Sharma, Rohit; Arya, Raj Kumar; Kumar, Amit; Vo, Dai‐Viet N.; Sharma, Gaurav

doi:10.1016/j.ijhydene.2021.08.190

Cited by 32 publications

(13 citation statements)

References 168 publications

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“…[ 221 ] To address these limitations, various LDHs‐based composites have been generated based on transition metals and their composites, such as sulfides, metal oxides, hydroxides, metal chalcogenides (selenides and tellurides), nitrides, and phosphides, in which these systems show promising effects as OER catalysts in the alkaline system due to their high surface area, exceptional electronic properties, and cost‐effectiveness. [ 221,227 ] In addition, the LDHs with free layer spacing, in combination with the conductive materials, such as graphene, significantly improve the charge transportation. In a case, the in situ exfoliation approach of FeCo‐LDHs was proposed using the GDY‐induced intercalation and decoration, resulting in the ultrathin LDHs toward enhanced electrocatalytic activities and OER/HER stabilities in KOH.…”

Section: Applicationsmentioning

confidence: 99%

Trends in Layered Double Hydroxides‐Based Advanced Nanocomposites: Recent Progress and Latest Advancements

Chen

Xia

Mende

et al. 2022

Adv Materials Inter

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Recently, layered double hydroxides (LDHs) have gathered vast interest due to overall positive charge, unique crystallinity, and biocompatibility for diverse applications. Despite the advantageous attributes, these hydrotalcites often result in several limitations concerning the application requirements, such as aggregation, as well as poor chemical and thermal stabilities, hindering their scale‐up progress and practical utilization. In addressing these issues, the recent advancements in the fabrication of intelligent LDHs nanocomposites based on organically (polymer/polyelectrolyte)‐modified and inorganic (metal)‐composited architectures are systematically presented. Initially, a brief note on the shortcomings in various fields and the chemistry of these pristine LDHs is given. Then, various synthetic strategies used to fabricate these emerging LDH nanocomposites are comprehensively emphasized, focusing on the advancements in their structure and applicability. In addition, the effects of various attractive physicochemical attributes of LDHs and their nanocomposite forms are discussed, including their applicability in adsorption, biomedicine, catalysis, energy, and environment‐related applications. In summary, this article is concluded with an outlook concerning the positioning of LDH‐based nanocomposites compared to other innovative materials, as well as the current challenges and future requirements for scale‐up.

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Section: Applicationsmentioning

confidence: 99%

Trends in Layered Double Hydroxides‐Based Advanced Nanocomposites: Recent Progress and Latest Advancements

Chen

Xia

Mende

et al. 2022

Adv Materials Inter

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“…Nowadays, one of the common modification methods is to load metal oxides, metal hydroxides, and metal–organic frameworks on materials, which have a good affinity for small-molecule pollutants due to abundant functional groups and metal active sites. − Studies have applied them to enhance the inhibition of disinfection byproduct formation. Lately, layered double hydroxides (LDHs), a large class of inorganic layered materials, have been widely used in the fields of environment for water purification applications. − The high surface area, highly tunable interior architecture, and outstanding anion-exchange ability render LDH promising adsorbents for both inorganic and organic contaminants. , However, LDH materials prepared by the conventional methods often appear as aggregated lumps, which limits their applications. Related research shows that the LDH grown in situ on the template exhibits a three-dimensional (3D) hierarchical and open structure .…”

Section: Introductionmentioning

confidence: 99%

Removal of Aliphatic Amines by NiLa-Layered Double Hydroxide Nanostructures

Liu

Yin

Zhang

et al. 2022

ACS Appl. Nano Mater.

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Dimethylamine (DMA) and diethylamine (DEA) as precursors for the formation of potentially N-nitrosamines are widespread in the environment, and the removal of these disinfection byproduct precursors from water is of great significance to control the quality of drinking water. In this study, a three-dimensional hierarchical NiLa-layered double hydroxide/biochar nanocomposite (NiLa-LDH/BC) was prepared to remove them from a synthetic solution and real surface water. NiLa-LDH nanoplatelets endowed the biochar with an improved porous structure, high functional groups, and more active metal sites. NiLa-LDH/BC exhibited a high DMA and DEA adsorption capacity of 46.45 and 40.10 mg g −1 , which is 6.31 and 7.85 times higher than that of BC, respectively. A fixed-bed column experiment revealed that NiLa-LDH/BC could last for ∼1860 to 2400 bed volumes (BVs) before a breakthrough occurred (approximately 9 times higher than that of BC). In addition, the leaching test and regeneration and toxicity test of Daphnia magna demonstrate the high stability (over 88% adsorption capacity after seven adsorption−desorption cycles), extremely low metal leaching (<0.01 mg g −1 ), and low toxicity (24h-EC 50 and 48h-EC 50 of the NiLa-LDH/BC leachates were 13.07 and 6.33%, respectively). According to material characterization, the main removal mechanism of DMA and DEA by NiLa-LDH/BC was electrostatic attraction, hydrogen bonding, and complexation. Density functional theory calculations were also applied to evaluate the DMA and DEA adsorption performance of materials. Overall, this study indicated that three-dimensional hierarchical NiLa-LDH/ BC can be promising in highly efficient removal of N-nitrosamine precursors from real surface water.

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“…The continuous and rapid increase in the human population worldwide is directly related to the escalating global energy demand. This demand is currently being addressed by using renewable and non-renewable energy sources, with the caveat that non-renewable fuels contribute substantially to the total energy production [ 1 ] despite their negative impact on the environment [ 2 ]. Instead, the focus should be on the development of eco-friendly technologies for fuels that could be used to avoid a future energy crisis.…”

Section: Introductionmentioning

confidence: 99%

The pH Influence on the Water-Splitting Electrocatalytic Activity of Graphite Electrodes Modified with Symmetrically Substituted Metalloporphyrins

Țăranu

Fagadar‐Cosma

2022

Nanomaterials

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Hydrogen, considered to be an alternative fuel to traditional fossil fuels, can be generated by splitting water molecules into hydrogen and oxygen via the use of electrical energy, in a process whose efficiency depends directly on the employed catalytic material. The current study takes part in the relentless search for suitable and low-cost catalysts relevant to the water-splitting field by investigating the electrocatalytic properties of the O2 and H2 evolution reactions (OER and HER) of two metalloporphyrins: Zn(II) 5,10,15,20-tetrakis(4-pyridyl)-porphyrin and Co(II) 5,10,15,20-tetrakis(3-hydroxyphenyl)-porphyrin. The TEM/STEM characterisation of the porphyrin samples obtained using different organic solvents revealed several types of self-assembled aggregates. The HER and OER experiments performed on porphyrin-modified graphite electrodes in media with different pH values revealed the most electrocatalytically active specimens. For the OER, this specimen was the electrode manufactured with one layer of Co-porphyrin applied from dimethylsulfoxide, exhibiting an overpotential of 0.51 V at i = 10 mA/cm2 and a Tafel slope of 0.27 V/dec. For the HER, it was the sample obtained by drop casting one layer of Zn-porphyrin from N,N-dimethylformamide that displayed a HER overpotential of 0.52 V at i = −10 mA/cm2 and a Tafel slope of 0.15 V/dec.

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Recent progress and challenges in photocatalytic water splitting using layered double hydroxides (LDH) based nanocomposites

Cited by 32 publications

References 168 publications

Trends in Layered Double Hydroxides‐Based Advanced Nanocomposites: Recent Progress and Latest Advancements

Trends in Layered Double Hydroxides‐Based Advanced Nanocomposites: Recent Progress and Latest Advancements

Removal of Aliphatic Amines by NiLa-Layered Double Hydroxide Nanostructures

The pH Influence on the Water-Splitting Electrocatalytic Activity of Graphite Electrodes Modified with Symmetrically Substituted Metalloporphyrins

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