Controlled preparation of multiple mesoporous CoAl-LDHs nanosheets for the high performance of NO<sub>x</sub> detection at room temperature

Wang, Di; Zhi, Lin; Hong, Yang; Lin, Chong; Pan, Qing‐Jiang; Li, Li; Shi, Keying

doi:10.1039/d0ra06250b

Cited by 9 publications

(6 citation statements)

References 45 publications

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“…Whether Co5/Fe1 or Co-LDHs, the main peak of the O 1s moves in the direction of low binding energy as the current density increases, suggesting that water molecules react with the Co or Fe active sites. The peaks located at 531.4 (Co–OH, Co-LDHs) and 532.8 eV (Co–OH, Co5/Fe1) shifted to 530 (Co-LDHs) and 531.3 eV (Co5/Fe1) as the reaction proceeds, which may be due to the presence of the Co–O absorption peak, and the emergence of Co–O and Co–O–H implies the generation of Co–O–OH. ,, It is worth noting that Co5/Fe1 has a relatively rapid migration under the initial current density, indicating a stronger reaction response. To Co-LDHs, it is shown that the main peak of O 1s in XPS spectra first widens during the prior reaction because of the increased proportion of surface-adsorption-O (ads.…”

Section: Resultsmentioning

confidence: 99%

Tuning Co²⁺ Coordination in Cobalt Layered Double Hydroxide Nanosheets via Fe³⁺ Doping for Efficient Oxygen Evolution

et al. 2021

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Inexpensive and efficient electrocatalysts are crucial for the development and practical application of energy conversion and storage technologies. Layered-double-hydroxide (LDH) materials have attracted much attention due to the special layered structure, but their electrocatalytic activity and stability are still limited. Herein, we propose to tune Co 2+ occupancy and coordination in cobaltbased LDH nanosheets via Fe 3+ doping for efficient and stable electrocatalysis for oxygen evolution reaction (OER). It is found that Fe doping regulates the occupancy and coordination of Co 2+ in CoO 4 tetrahedrons and CoO 6 octahedrons of Co-LDHs. Through density functional theory calculation, we also clarified that Fe 3+ not only modulated the Co 2+ coordination but also functioned as an added catalytic active site. LDH nanosheets with a Co/Fe ratio of 5:1 show a low OER overpotential, much better than the commercial IrO 2 , owing to the modulation of Fe 3+ doping on the crystal and electronic structures. After appropriate incorporation of Fe 3+ , the almost inactive octahedral coordinated Co 2+ is significantly activated with a partial deletion of tetrahedral coordinated Co 2+ , which greatly boosts the overall electrocatalytic activity. This study offers some new insights into tuning the crystal and electronic structures of LDHs by lattice doping to achieve high-efficiency electrocatalysis for OER.

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Section: Resultsmentioning

confidence: 99%

Tuning Co²⁺ Coordination in Cobalt Layered Double Hydroxide Nanosheets via Fe³⁺ Doping for Efficient Oxygen Evolution

et al. 2021

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“…The metal ratios in the final LDHs heavily influence their morphology, and consequently, their performance as sensors. Wang et al controlled the Co-to-Al ratio in CoAl-LDHs synthesized via hydrolysis for optimal electrochemical NO x detection [84]. Aqueous solutions with varying ratios of Co(NO 3 ) 2 •6H 2 O and Al(NO 3 ) 3 •9H 2 O were treated with urea for hydrothermal treatment.…”

Section: Hydro(solvo)thermal Synthesismentioning

confidence: 99%

Recent Advances in Layered Double Hydroxide-Based Electrochemical and Optical Sensors

Kim

Varga

Adhikari³

et al. 2021

Nanomaterials

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Layered double hydroxides (LDHs) have attracted considerable attention as promising materials for electrochemical and optical sensors owing to their excellent catalytic properties, facile synthesis strategies, highly tunable morphology, and versatile hosting ability. LDH-based electrochemical sensors are affordable alternatives to traditional precious-metal-based sensors, as LDHs can be synthesized from abundant inorganic precursors. LDH-modified probes can directly catalyze or host catalytic compounds that facilitate analyte redox reactions, detected as changes in the probe’s current, voltage, or resistance. The porous and lamellar structure of LDHs allows rapid analyte diffusion and abundant active sites for enhanced sensor sensitivity. LDHs can be composed of conductive materials such as reduced graphene oxide (rGO) or metal nanoparticles for improved catalytic activity and analyte selectivity. As optical sensors, LDHs provide a spacious, stable structure for synergistic guest–host interactions. LDHs can immobilize fluorophores, chemiluminescence reactants, and other spectroscopically active materials to reduce the aggregation and dissolution of the embedded sensor molecules, yielding enhanced optical responses and increased probe reusability. This review discusses standard LDH synthesis methods and overviews the different electrochemical and optical analysis techniques. Furthermore, the designs and modifications of exemplary LDHs and LDH composite materials are analyzed, focusing on the analytical performance of LDH-based sensors for key biomarkers and pollutants, including glucose, dopamine (DA), H2O2, metal ions, nitrogen-based toxins, and other organic compounds.

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“…25 Wang et al prepared hexagonal nanosheets Co-Al LDHs with a complete structure and uniform distribution via a one-step hydrothermal method; these materials showed a high sensing performance for 100 ppm NO x (17.09) and a fast response time (4.27 seconds). 26 Gheibi et al reported that their fabricated Ni-Cr-Al LDHs sensor had a response/ recovery time to acetone gas at room temperature of approximately several minutes. 27 The Ni-Fe-Al LDHs were prepared by a one-step hydrothermal method, and showed an 82% response to 100 ppm NO x at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional mesoporous ultrathin monometallic cobalt layered double hydroxides nanomaterials as efficient NO₂ gas sensor at room temperature

Luo

Tian

et al. 2022

CrystEngComm

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Controlled preparation of multiple mesoporous CoAl-LDHs nanosheets for the high performance of NO_x detection at room temperature

Abstract: By fine tuning the metal mole ratio, CoAl-LDHs (CA) with a 2D nanosheet structure were successfully prepared via a one-step hydrothermal method using urea as both precipitator and pore-forming agent.

Cited by 9 publications

References 45 publications

Tuning Co²⁺ Coordination in Cobalt Layered Double Hydroxide Nanosheets via Fe³⁺ Doping for Efficient Oxygen Evolution

Tuning Co²⁺ Coordination in Cobalt Layered Double Hydroxide Nanosheets via Fe³⁺ Doping for Efficient Oxygen Evolution

Recent Advances in Layered Double Hydroxide-Based Electrochemical and Optical Sensors

Three-dimensional mesoporous ultrathin monometallic cobalt layered double hydroxides nanomaterials as efficient NO₂ gas sensor at room temperature

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Controlled preparation of multiple mesoporous CoAl-LDHs nanosheets for the high performance of NOx detection at room temperature

Abstract: By fine tuning the metal mole ratio, CoAl-LDHs (CA) with a 2D nanosheet structure were successfully prepared via a one-step hydrothermal method using urea as both precipitator and pore-forming agent.

Cited by 9 publications

References 45 publications

Tuning Co2+ Coordination in Cobalt Layered Double Hydroxide Nanosheets via Fe3+ Doping for Efficient Oxygen Evolution

Tuning Co2+ Coordination in Cobalt Layered Double Hydroxide Nanosheets via Fe3+ Doping for Efficient Oxygen Evolution

Recent Advances in Layered Double Hydroxide-Based Electrochemical and Optical Sensors

Three-dimensional mesoporous ultrathin monometallic cobalt layered double hydroxides nanomaterials as efficient NO2 gas sensor at room temperature

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Controlled preparation of multiple mesoporous CoAl-LDHs nanosheets for the high performance of NO_x detection at room temperature

Tuning Co²⁺ Coordination in Cobalt Layered Double Hydroxide Nanosheets via Fe³⁺ Doping for Efficient Oxygen Evolution

Tuning Co²⁺ Coordination in Cobalt Layered Double Hydroxide Nanosheets via Fe³⁺ Doping for Efficient Oxygen Evolution

Three-dimensional mesoporous ultrathin monometallic cobalt layered double hydroxides nanomaterials as efficient NO₂ gas sensor at room temperature