Platinum nanocrystals supported on CoAl mixed metal oxide nanosheets derived from layered double hydroxides as catalysts for selective hydrogenation of cinnamaldehyde

Tian, Zhengbin; Li, Qingyang; Hou, Juying; Pei, Lei; Li, Yan; Ai, Shiyun

doi:10.1016/j.jcat.2015.08.020

Cited by 83 publications

(43 citation statements)

References 28 publications

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“…Furthermore, X‐ray photoelectron spectroscopy (XPS) analysis was carried out to corroborate the oxidation states of both Co and Al (Figure ). The presence of Co(II) is demonstrated thanks to the appearance of the main Co 2p 3/2 and Co 2p 1/2 peaks at 781 and 798 eV, respectively, accompanied by their satellite peaks at 788 and 804 eV, as reported for single Co(OH) 2 as well as CoAl−LDHs In addition, the spectrum of Al 2p is expected to exhibit a single peak at ca.…”

Section: Resultsmentioning

confidence: 70%

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Silva

Sanchis‐Gual

Carrasco

et al. 2020

Batteries & Supercaps

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Layered double hydroxides (LDHs) are promising supercapacitor materials due to their wide chemical versatility, earth abundant metals and high specific capacitances. Many parameters influencing the supercapacitive performance have been studied such as the chemical composition, the synthetic approaches, and the interlayer anion. However, no systematic studies about the effect of the basal space have been carried out. Here, two‐dimensional (2D) CoAl‐LDHs were synthesized through anion exchange reactions using surfactant molecules in order to increase the interlayer space (ranging from 7.5 to 32.0 Å). These compounds exhibit similar size and dimensions but different basal space to explore exclusively the interlayer distance influence in the supercapacitive performance. In this line, Co : Al ratios of 2 : 1, 3 : 1 and 4 : 1 were explored. In all cases, an enhancement of the specific capacitance was observed by increasing the basal space, reaching ca. 50 % more than the value obtained from the less‐spaced 2 : 1 CoAl‐LDH (going from ca. 750 to 1100 F.g−1 at 1 A.g−1). This increment mainly occurs because of the increase in the electrochemical surface area (up to ca. 260 %) and the higher electrolyte diffusion. Interestingly, the best performance is achieved for the lowest Co : Al ratio (i. e. the highest Al content) revealing the important role of the electrochemically inert Al in the structure.

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Section: Resultsmentioning

confidence: 70%

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Silva

Sanchis‐Gual

Carrasco

et al. 2020

Batteries & Supercaps

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“…As shown in Fig. 1a 25,26 Compared with those of CA1-1 and CA3-1, the diffraction peaks of CA2-1 at (003) and (006) lattice planes were intense, which indicated that CoAl-LDHs grew in a certain direction during the formation process. Moreover, no other diffraction peaks were observed in XRD, thus demonstrating the high purity of the prepared samples.…”

Section: Resultsmentioning

confidence: 94%

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

et al. 2020

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“…The steric hindrance and magnetic interaction forced nanobers to orient radially, 39 and the urchin-like grew up slowly (Scheme 1b), eventually formed in 3D ower-like structure (Scheme 1c). The main reactions in the precursor solution were described as follows: 40,41…”

Section: Resultsmentioning

confidence: 99%

Porous 3D flower-like CoAl-LDH nanocomposite with excellent performance for NO₂ detection at room temperature

Teng

et al. 2019

RSC Adv.

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The 3D flower-like CoAl-layered double hydroxide (CoAl-LDH) was successfully prepared using the functional template agent of fluoride ions via a facile one-step hydrothermal route. Various techniques proved that all the samples presented 3D flower-like microstructural morphology. Representatively, the CA-2 sample, which was synthesized with the molar ratio of Co : Al of 3.65 : 1, had considerably abundant pores in its thin nanosheets. The average pore size was 2-4 nm, the specific surface area was equal to 49.45 m 2 g À1 , and the thickness of nanosheets was approximately 3.068 nm. The CA-2 sample showed an excellent response to 0.01-100 ppm NO 2 with ultrafast response/recovery time at room temperature (RT). The detection limit of the sensor even reached 10 ppb. The superior gas sensing performance could be attributed to the synergistic effects of the functional template agent of fluoride ions and specific porous 3D flower-like nanostructure. The current study showed that the 3D flower-like CoAl-LDHs might a promising material in practical detection of NO 2 at RT. Scheme 2 Schematic for the mechanism of NO 2 sensing for CoAl-LDHs. (a) SEM image of 3D flower-like CA-2 on Au electrode; (b and c) the model with response procedure of gas sensing; (d) I-V curve measured for CA-2 sensor in air and 50 ppm NO 2 exposure at RT; (e) IR spectra of CA-2 before and after NO 2 gas detection (CA-2 test NO 2 gas sensing for 2 h).21918 | RSC Adv., 2019,9,[21911][21912][21913][21914][21915][21916][21917][21918][21919][21920][21921] This journal is

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Platinum nanocrystals supported on CoAl mixed metal oxide nanosheets derived from layered double hydroxides as catalysts for selective hydrogenation of cinnamaldehyde

Cited by 83 publications

References 28 publications

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

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

Porous 3D flower-like CoAl-LDH nanocomposite with excellent performance for NO₂ detection at room temperature

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Platinum nanocrystals supported on CoAl mixed metal oxide nanosheets derived from layered double hydroxides as catalysts for selective hydrogenation of cinnamaldehyde

Cited by 83 publications

References 28 publications

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

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

Porous 3D flower-like CoAl-LDH nanocomposite with excellent performance for NO2 detection at room temperature

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Product

Resources

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

Porous 3D flower-like CoAl-LDH nanocomposite with excellent performance for NO₂ detection at room temperature