Porous NiO nanoflowers and nanourchins: Highly active catalysts for toluene combustion

Bai, Guangmei; Dai, Hongxing; Deng, Jiguang; Liu, Yuxi; Ji, Kemeng

doi:10.1016/j.catcom.2012.07.008

Cited by 110 publications

(74 citation statements)

References 29 publications

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“…In comparison with the XRD patterns of the standard cubic NiO sample (JCPDS PDF# 47-1049), the peaks located at 2Â = 37.2 • ,43.3 • , 62.9 • , 75.4 • , and 79.4 • can be assigned to the (1 1 1), (2 0 0), (2 2 0), (3 1 1), and (2 2 2) crystal planes, respectively [41,42]. It is apparent that pure cubic NiO crystalline phase has been formed in all the NiO samples [15,16]. To quantify the crystallinity of the samples, the crystalline sizes of the samples are listed in Table 2.…”

Section: Xrd Patterns Of the Fresh And Used Catalystsmentioning

confidence: 92%

“…catalysts significantly. In addition, pure NiO nano-flower [15] and nano-rings [29] are reported recently to be very active for toluene and CO oxidation, due to the existence of morphology effect, the preferentially exposed active facets, the higher surface area and the formation of more active surface oxygen species, etc. These effects could also enable NiO to be an active catalyst for CH 4 …”

Section: Introductionmentioning

confidence: 98%

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Porous NiO nano-sheet as an active and stable catalyst for CH4 deep oxidation

Peng

et al. 2015

Applied Catalysis A: General

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Section: Xrd Patterns Of the Fresh And Used Catalystsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 98%

Porous NiO nano-sheet as an active and stable catalyst for CH4 deep oxidation

Peng

et al. 2015

Applied Catalysis A: General

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“…The corresponding values are displayed in Table 1. 20 refer to the open-circuit value of the cell after electrochemical cycling. The number of consecutive electrochemical cycles was 20 (vide infra).…”

Section: Analysis Of the Voltammetric Datamentioning

confidence: 99%

“…p-type nickel oxide (NiO) [1,2]; is widely employed as electrodic material in photoelectrochemical cells [3][4][5][6][7][8][9], electrochromic windows [10][11][12][13][14], and charge storage systems [15][16][17], among others [18][19][20]. The wide range of NiO applicability derives from the fact that NiO can constitute a functional material in both bulk [21] and nanostructured [22,23] versions.…”

Section: Introductionmentioning

confidence: 99%

“…Because dye anchoring is supposed to annihilate the positively charged sites on the surface of the defective nanostructured NiO, the extent of the OCV dark decrease is related to the degree of surface passivation and, as a such, represents a measure of the efficacy with which a single molecule covers the NiO electrode surface. In fact, the combined analysis 20 refer to the open-circuit value of the cell after electrochemical cycling. The number of consecutive electrochemical cycles was 20 (vide infra).…”

Section: Analysis Of the Voltammetric Datamentioning

confidence: 99%

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Effect of Sensitization on the Electrochemical Properties of Nanostructured NiO

et al. 2018

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Screen-printed NiO electrodes were sensitized with 11 different dyes and the respective electrochemical properties were analyzed in a three-electrode cell with the techniques of cyclic voltammetry and electrochemical impedance spectroscopy. The dye sensitizers of NiO were organic molecules of different types (e.g., squaraines, coumarins, and derivatives of triphenyl-amines and erythrosine B), which were previously employed as sensitizers of the same oxide in dye-sensitized solar cells of p-type (p-DSCs). Depending on the nature of the sensitizer, diverse types of interactions occurred between the immobilized sensitizer and the screen-printed NiO electrode at rest and under polarization. The impedance data recorded at open circuit potential were interpreted in terms of two different equivalent circuits, depending on the eventual presence of the dye sensitizer on the mesoporous electrode. The fitting parameter of the charge transfer resistance through the electrode/electrolyte interface varied in accordance to the differences of the passivation action exerted by the various dyes against the electrochemical oxidation of NiO. Moreover, it has been observed that the resistive term R CT associated with the process of dark electron transfer between the dye and NiO substrate is strictly correlated to the overall efficiency of the photoconversion (η) of the corresponding p-DSC, which employs the same dye-sensitized electrode as photocathode.

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Synergetically Selective Toluene Sensing in Hematite‐Decorated Nickel Oxide Nanocorals

Suh

Shim

Kim

et al. 2017

Adv Materials Technologies

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The decoration of p‐type nickel oxide (NiO) with n‐type hematite (α‐Fe2O3) to achieve vertically ordered 1D nanostructures is an attractive strategy to enhance gas sensing properties. Herein, the authors report a facile method for α‐Fe2O3 decoration of the whole surface of vertical NiO nanorods. An NiO/Fe heterostructure is deposited in multiple steps using a glancing angle deposition method, which is followed by the oxidation of Fe into α‐Fe2O3. Thermally agglomerated α‐Fe2O3 nanoparticles are uniformly distributed on the whole surface of the NiO nanorods. Due to the α‐Fe2O3 decoration, the NiO nanorods exhibit a coral‐like rough surface and, more interestingly, their preferential crystallographic orientation changed from (111) to (200). Compared to bare NiO nanorods, the α‐Fe2O3‐decorated NiO nanocorals exhibit a 45.4 times higher response to 50 ppm toluene (C7H8) at 350 °C. Their theoretical detection limit for C7H8 is calculated to be ≈22 ppb. The observed unprecedented synergetic effects of α‐Fe2O3‐decorated NiO nanocorals for the extremely selective C7H8 sensing, as well as their facile synthetic route, establish a new perspective on heterostructured metal oxide 1D nanostructures for selective gas sensing.

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Porous NiO nanoflowers and nanourchins: Highly active catalysts for toluene combustion

Cited by 110 publications

References 29 publications

Porous NiO nano-sheet as an active and stable catalyst for CH4 deep oxidation

Porous NiO nano-sheet as an active and stable catalyst for CH4 deep oxidation

Effect of Sensitization on the Electrochemical Properties of Nanostructured NiO

Synergetically Selective Toluene Sensing in Hematite‐Decorated Nickel Oxide Nanocorals

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