Hydrothermal Continuous Flow Synthesis and Exfoliation of NiCo Layered Double Hydroxide Nanosheets for Enhanced Oxygen Evolution Catalysis

Liang, Hanfeng; Meng, Fanning; Cabán-Acevedo, Miguel; Li, Linsen; Forticaux, Audrey; Xiu, Lichen; Wang, Zhoucheng; Jin, Song

doi:10.1021/nl504872s

Cited by 911 publications

(601 citation statements)

References 49 publications

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“…Currently, transition‐metal (Fe, Co, Ni, Mn, and Mo)‐based catalysts including metal oxides,23, 24, 25, 26, 27, 28, 29, 30 hydroxides,31, 32, 33, 34, 35 phosphides,36, 37, 38, 39, 40, 41, 42 sulfides,43, 44, 45, 46, 47, 48 selenides,49, 50, 51, 52, 53, 54 and nitrides55, 56, 57, 58, 59, 60, 61, 62 have been highlighted as the most promising candidates of OER and HER electrocatalysts. Especially, layered double hydroxides (LDHs)63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85 and their derivatives (metal hydroxides, oxyhydroxides, oxides, bimetal nitrides, phosphides, sulfides, and selenides)86, 87, 88, 89, 90, 91, 92…”

Section: Introductionmentioning

confidence: 99%

Recent Progress on Layered Double Hydroxides and Their Derivatives for Electrocatalytic Water Splitting

et al. 2018

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Layered double hydroxide (LDH)‐based materials have attracted widespread attention in various applications due to their unique layered structure with high specific surface area and unique electron distribution, resulting in a good electrocatalytic performance. Moreover, the existence of multiple metal cations invests a flexible tunability in the host layers; the unique intercalation characteristics lead to flexible ion exchange and exfoliation. Thus, their electrocatalytic performance can be tuned by regulating the morphology, composition, intercalation ion, and exfoliation. However, the poor conductivity limits their electrocatalytic performance, which therefore has motivated researchers to combine them with conductive materials to improve their electrocatalytic performance. Another factor hampering their electrocatalytic activity is their large lateral size and the bulk thickness of LDHs. Introducing defects and tuning electronic structure in LDH‐based materials are considered to be effective strategies to increase the number of active sites and enhance their intrinsic activity. Given the unique advantages of LDH‐based materials, their derivatives have been also used as advanced electrocatalysts for water splitting. Here, recent progress on LDHs and their derivatives as advanced electrocatalysts for water splitting is summarized, current strategies for their designing are proposed, and significant challenges and perspectives of LDHs are discussed.

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Section: Introductionmentioning

confidence: 99%

Recent Progress on Layered Double Hydroxides and Their Derivatives for Electrocatalytic Water Splitting

et al. 2018

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“…tunable metal species/ratios, and exchangeable interlayer spacings, etc. ), layered double hydroxides (LDHs) [23][24][25][26][27] and among which, NiFe LDH showed the best performance.28 Nevertheless, reducing the overpotential and increasing the current density remain under intensive pursuit for promoting the application of NiFe LDH. For example, the introduction of conductive materials (graphene, carbon nanotube, etc.)…”

mentioning

confidence: 99%

“…tunable metal species/ratios, and exchangeable interlayer spacings, etc. ), layered double hydroxides (LDHs) [23][24][25][26][27] and among which, NiFe LDH showed the best performance.…”

mentioning

confidence: 99%

Ni Nanoparticles Decorated NiFe Layered Double Hydroxide as Bifunctional Electrochemical Catalyst

Gao

Long

Han

et al. 2017

J. Electrochem. Soc.

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Reducing overpotential and increasing current density remain a great challenge for promoting the application of transition metalsbased layered double hydroxides (LDHs). Herein, Ni nanoparticles (∼10 nm) decorated NiFe LDH ultrathin (thickness: ∼2 nm) nanosheets (Ni NP/NiFe LDH) were successfully synthesized which exhibited advanced electrocatalytic activity and long-term stability on both oxygen evolution reaction (OER) and urea oxidation reaction (UOR). The onset potentials for OER and UOR are 1.50 V and 1.34 V, respectively, both are lower than NiFe LDH under the same conditions. Moreover, the peak current density of UOR was 300 mA/cm 2 , which is much larger than reported precious-metal free UOR catalysts. The excellent catalytic performance of Ni NP/NiFe LDH composite for OER and UOR is proposed to result from the abundant exposed active sites, small charge transfer resistance, and the synergistic effects between NiFe LDH and anchored Ni nanoparticles. This work provides inspiring ideas and helpful guidelines in design of low-cost but highly efficient electrochemical catalysts. The global energy crisis and environmental contamination have prompted intense research into the development of sustainable energy conversion and storage systems.1-10 Water splitting and direct urea fuel cell (DUFC) as promising approaches to produce clean energy recyclable, have been widely investigated recently. Nevertheless, oxygen evolution reaction (OER: 2H 2 O === O 2 + 4H + + 4e − ) suffers from a sluggish kinetics owing to a 4e-transfer process, which is frequently an obstacle to the whole water splitting. Same as OER, urea oxidation reaction (UOR: CO(NH 2 ) 2 + H 2 O === N 2 + 3H 2 + CO 2 ) is also under a multistep proton-coupled electron transfer process, which remains to be a great challenge for DUFC. As a consequence, the sluggish kinetics of OER and UOR lead to considerable overpotential and decrease the efficiency of energy conversion and storage. To achieve efficient energy conversion, much effort has been devoted to the research for robust yet stable electrochemical catalysts with reduced overpotentials. Precious metal based catalysts have shown significant electrocatalytic properties, 11-13 but their high cost and scarcity hamper the commercialization of the technique. Therefore, developing functional nanomaterials composed of cost-effective and abundant elements are on great demand.Owing to the unique physicochemical properties (e.g. tunable metal species/ratios, and exchangeable interlayer spacings, etc.), layered double hydroxides (LDHs) [23][24][25][26][27] and among which, NiFe LDH showed the best performance.28 Nevertheless, reducing the overpotential and increasing the current density remain under intensive pursuit for promoting the application of NiFe LDH. For example, the introduction of conductive materials (graphene, carbon nanotube, etc.) into LDH systems can improve the conductivity of the catalysts 21,22 and hence further enhance their catalytic performance. Herein, we report a bifunctional catalyst ...

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“…As shown in Figure 9 , the bulk CoAl‐LDH (CO 3 2− ) was first prepared by a hydrothermal treatment. Subsequently, the bulk CoAl‐LDH crystal was immersed into a solution bearing an excess of anions to increase the interlayer distance, which accelerated the subsequent exfoliation of CoAl‐LDH 118. Finally, the single‐layer CoAl‐NSs were self‐assembled on the acid‐treated 3D graphene networks through the electrostatic adsorption.…”

Section: Self‐assembled Graphene‐based Hybrid Structuresmentioning

confidence: 99%

Self‐Assembled Graphene‐Based Architectures and Their Applications

Yuan

Xiao

et al. 2017

Advanced Science

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Due to unique planar structures and remarkable thermal, electronic, and mechanical properties, chemically modified graphenes (CMGs) such as graphene oxides, reduced graphene oxides, and the related derivatives are recognized as the attractive building blocks for “bottom‐up” nanotechnology, while self‐assembly of CMGs has emerged as one of the most promising approaches to construct advanced functional materials/systems based on graphene. By virtue of a variety of noncovalent forces like hydrogen bonding, van der Waals interaction, metal‐to‐ligand bonds, electrostatic attraction, hydrophobic–hydrophilic interactions, and π–π interactions, the CMGs bearing various functional groups are highly desirable for the assemblies with themselves and a variety of organic and/or inorganic species which can yield various hierarchical nanostructures and macroscopic composites endowed with unique structures, properties, and functions for widespread technological applications such as electronics, optoelectronics, electrocatalysis/photocatalysis, environment, and energy storage and conversion. In this review, significant recent advances concerning the self‐assembly of CMGs are summarized, and the broad applications of self‐assembled graphene‐based materials as well as some future opportunities and challenges in this vibrant area are elucidated.

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Hydrothermal Continuous Flow Synthesis and Exfoliation of NiCo Layered Double Hydroxide Nanosheets for Enhanced Oxygen Evolution Catalysis

Cited by 911 publications

References 49 publications

Recent Progress on Layered Double Hydroxides and Their Derivatives for Electrocatalytic Water Splitting

Recent Progress on Layered Double Hydroxides and Their Derivatives for Electrocatalytic Water Splitting

Ni Nanoparticles Decorated NiFe Layered Double Hydroxide as Bifunctional Electrochemical Catalyst

Self‐Assembled Graphene‐Based Architectures and Their Applications

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