Layered double hydroxide- and graphene-based hierarchical nanocomposites: Synthetic strategies and promising applications in energy conversion and conservation

Varadwaj, G. Bishwa Bidita; Nyamori, Vincent O.

doi:10.1007/s12274-016-1250-3

Cited by 109 publications

(63 citation statements)

References 191 publications

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“…and other materials. [19][20][21] These composites exhibited improved activities owing to their modulated electrical conductivity and ease mobility of electrons during electrochemical reactions. The deposition of nano-sized noble metals into the hierarchical structure of transition metals or even conductive scaffolds could successfully bring significant effects in their electrical conductivity and electrochemical activity.…”

Section: Introductionmentioning

confidence: 99%

3D Hierarchical NiCo Layered Double Hydroxide Nanosheet Arrays Decorated with Noble Metal Nanoparticles for Enhanced Urea Electrocatalysis

Khalafallah

Zhi

et al. 2019

ChemElectroChem

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The electrocatalysis of urea represents an important potential as an efficient technology for sustainable energy development. This anodic reaction generates hydrogen or electrical power through direct electrooxidation of urea molecules, but is greatly inhibited by its slow kinetics. Therefore, tailoring highly efficient, earth‐abundant, and durable electrocatalysts for urea oxidation reaction (UOR) is a fundamental for the enhancement of green energy conversion technologies. Herein, we report a scalable synthetic strategy to construct three‐dimensional (3D) nickel‐cobalt layered double hydroxide nanosheet arrays (NiCo−LDH NSAs) with silver (Ag0) or gold (Au0) and palladium (Pd0) intercalants as high performance catalysts for UOR. Experimental results suggest that the interlayer spacing of multi‐anions LDH NSAs can effectively afford synergetic effects of increased electrochemical surface area, better exposure of catalytically active sites, and favorable adsorption energy of urea molecules. As expected, the deposition of noble metal nanoparticles (NPs) could successfully modulate the electronic structure, delivering a rise to significantly improved UOR activity. Specifically, the Au/NiCo−LDH hybrid exhibits a superior electro‐catalytic performance toward urea electrooxidation with a highest current. These findings offer an effective pathway to prepare potential earth‐abundant electrocatalysts for direct urea fuel cells (DUFCs).

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Section: Introductionmentioning

confidence: 99%

3D Hierarchical NiCo Layered Double Hydroxide Nanosheet Arrays Decorated with Noble Metal Nanoparticles for Enhanced Urea Electrocatalysis

Khalafallah

Zhi

et al. 2019

ChemElectroChem

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“…Thus, this distinctly underlines the fundamental and technological importance of surface charge modification between two dissimilar 2D nanomaterials for robust interfacial interactions in unraveling the charge dynamics for enhanced photocatalysis. Benefiting from the predominant role of graphene as the electron reservoir (Zhang et al, , 2015bTan et al, 2015b;Mateo et al, 2016;Varadwaj and Nyamori, 2016), the photoinduced electrons were transferred from pCN to rGO across the interface to overwhelmingly suppress the charge recombination rate ( Figure 5E). All in all, the smart 2D/2D interface engineering design of graphene/g-C3N4 developed thus far is considered as an auspicious means, which could be eminently extended to heteroatom-doping graphenehybridized g-C3N4 for targeting superior photochemistry applications for real-life applications.…”

Section: Hybridization With 2d Graphenementioning

confidence: 99%

2D/2D Graphitic Carbon Nitride (g-C3N4) Heterojunction Nanocomposites for Photocatalysis: Why Does Face-to-Face Interface Matter?

Ong

2017

Front. Mater.

211

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In recent years, two-dimensional (2D) graphitic carbon nitride (g-C3N4) has elicited interdisciplinary research fascination among the scientific communities due to its attractive properties such as appropriate band structures, visible-light absorption, and high chemical and thermal stability. At present, research aiming at engineering 2D g-C3N4 photocatalysts at an atomic and molecular level in conquering the global energy demand and environmental pollution has been thriving. In this review, the cutting-edge research progress on the 2D/2D g-C3N4-based hybrid nanoarchitectures will be systematically highlighted with a specific emphasis on a multitude of photocatalytic applications, not only in waste degradation for pollution alleviation, but also in renewable energy production [e.g., water splitting and carbon dioxide (CO2) reduction]. By reviewing the substantial developments on this hot research platform, it is envisioned that the review will shed light and pave a new prospect for constructing high photocatalytic performance of 2D/2D g-C3N4-based system, which could also be extended to other related energy fields, namely solar cells, supercapacitors, and electrocatalysis.

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“…Among the support materials, carbon based graphene oxide has extra advantages. Graphene is nontoxic, two‐dimensional material and possess impressive properties, such as high surface area, high optical and electrical conductivity etc. making it ideal as catalytic support.…”

Section: Catalyst Screening In the Formation Of Productsmentioning

confidence: 99%

CuO/Graphene Oxide Nanocomposite as Highly Active and Durable Catalyst for Selective Oxidation of Cyclohexane

Rana

Jonnalagadda

2017

ChemistrySelect

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Achieving breakage of C−H bond of hydrocarbons performance still remains a significant challenge in oxidation chemistry for heterogeneous catalyst. In this work, we report copper oxide‐ graphene oxide (CuO‐GO) nanocomposites as durable and highly active and selective catalyst for oxidation of cyclohexane. Different wt% of Cu(II) loaded on RGO surface to form a nanocomposite as well as Co(II) and Ni(II) loaded GO composites were prepared by wet impregnation method. The efficacy of catalyst was tested towards selective oxidation of cyclohexane. 5wt%CuO‐GO proved to be superior in terms improved selectivity towards cyclohexanone (82 %) and short reaction times, plus easy recovery and reusability of the catalyst. The presence of functional groups prevent the aggregation of catalytically active CuO species during the reaction progress.

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Layered double hydroxide- and graphene-based hierarchical nanocomposites: Synthetic strategies and promising applications in energy conversion and conservation

Cited by 109 publications

References 191 publications

3D Hierarchical NiCo Layered Double Hydroxide Nanosheet Arrays Decorated with Noble Metal Nanoparticles for Enhanced Urea Electrocatalysis

3D Hierarchical NiCo Layered Double Hydroxide Nanosheet Arrays Decorated with Noble Metal Nanoparticles for Enhanced Urea Electrocatalysis

2D/2D Graphitic Carbon Nitride (g-C3N4) Heterojunction Nanocomposites for Photocatalysis: Why Does Face-to-Face Interface Matter?

CuO/Graphene Oxide Nanocomposite as Highly Active and Durable Catalyst for Selective Oxidation of Cyclohexane

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