JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
·
IF 3.235
Weiwei Mao,Haiping He,Zhizhen Ye,Jingyun Huang
A facile and in-situ electrochemical nanofabrication towards three-dimensional graphene@nickel foam (3DGF) to produce Ni(OH) 2 nanosheets was proposed and the integrated Ni(OH) 2 /3DGF electrode for glucose sensing was researched. The nanofabrication of chemical battery reaction is mild and facile. Nanopores formation plays a key role in promoting the growth of Ni(OH) 2 nanosheets, leading to enhanced electro-catalysis. In this constructed unique 3D hierarchical architecture, graphene layers not only provide excellent electrical conductivity but also benefit to the sensing stability, while the 3D interconnected structure prevents the agglomeration or exfoliation of Ni(OH) 2 nanosheets and the porous Ni(OH) 2 film benefits to the mass and charge transfer, and thus improving the sensing performance remarkably. As a successful demonstration, the fabricated Ni(OH) 2 /3DGF glucose sensor exhibits an appreciable sensitivity 2366 μA mM −1 cm −2 and a low detection limit of 0.32 μM. This study proposes an easy and convenient strategy to prepare Ni(OH) 2 and graphene integrated glucose sensor, promisingly applied in practice.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Meng Zhang,Junfeng Zhang,Yingquan Wu,Junxuan Pan,Qingde Zhang,Yisheng Tan,Yizhuo Han
Carbon deposition on the catalyst surface has been considered as one of the main reasons to cause Ni catalyst deactivation during methane reforming with carbon dioxide (DRM). Generally, it is thought that the properties and levels of coke formation are significantly affected by the ability of CO 2 adsorption and activation, which is closely related to the oxygen species over catalyst surface. In this study, the effects of oxygen species on the DRM over Ni/ZrO 2 catalysts were investigated. Wherein, ZrO 2 support was further treated under H 2 , N 2 , and O 2 atmospheres respectively to obtain different oxygen species distribution over the surface, and 3 wt.% Ni was introduced by the deposition-precipitation method. The representative samples were characterized using XRD, EPR, XPS, FTIR, TPR, TPD , TPSR, TG, Raman and TPH techniques, etc. It was found that the treatment to ZrO 2 in the reducing gas such as H 2 was able to promote the formation of adsorbed oxygen species over the surface. CO 2 DRIFTS and CH 4 -TPSR experiments further confirmed that adsorbed oxygen species were favorable for enhancing both CO 2 adsorption and activation and CH 4 dissociation. As a result, the catalyst with more adsorbed oxygen species exhibited relatively outstanding performance for the DRM and promotional ability in removal of the deposited carbon.
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NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 19
·16329-16334
·
IF 3.201
Jian Cheng,Junhong Ma,Yuhua Ma,Cui Zhou,Yue Qiang,Xiaofeng Zhou,Jianya Yang,Haokun Shi,Yahong Xie
Dye-sensitized solar cells (DSSCs) have many advantages, but the use of expensive platinum counter electrodes (CEs) limits their industrial applications. In this work, a Co–Ni/carbon aerogel composite with a unique three-dimensional network structure and high specific surface area was prepared through simple ion exchange and carbonization of low-cost sodium alginate supramolecular hydrogels. Using this metal/carbon aerogel composite as the CE (hereafter denoted as CAE) of ZnO-based DSSCs, a photoelectric conversion efficiency (PCE) of 5.08% was obtained. This value was 94.44% of the PCE obtained using Pt. Analysis of current–voltage curves, cyclic voltammograms, and electrochemical impedance spectra revealed that the fabricated CAE had higher catalytic activity than a Pt CE and comparable charge-transfer ability. The adhesion of the CAE onto FTO was also strong with carbon paste as an adhesive.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2012
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IF 0.826
Huiling CHEN,Shuanjin WANG,Min XIAO,Dongmei HAN,Yixin LU,Yuezhong MENG
The 0.4 nm molecular sieve supported Cu-Ni bimetal catalysts for direct synthesis of dimethyl carbonate (DMC) from CO 2 and CH 3 OH were prepared and investigated. The synthesized catalysts were fully characterized by BET, XRD (X-ray diffraction), TPR (temperature programmed reduction), IR (infra-red adsorption), NH 3 -TPD (temperature programmed desorption) and CO 2 -TPD (temperature programmed desorption) techniques. The results showed that the surface area of catalysts decreased with increasing metal content, and the metals as well as Cu-Ni alloy co-existed on the reduced catalyst surface. There existed interaction between metal and carrier, and moreover, metal particles affected obviously the acidity and basicity of carrier. The large amount of basic sites facilitated the activation of methanol to methoxyl species and their subsequent reaction with activated carbon dioxide. The catalysts were evaluated in a continuous tubular fixed-bed micro-gaseous reactor and the catalyst with bimetal loading of 20% (by mass) had best catalytic activities. Under the conditions of 393 K, 1.1 MPa, 5 h and gas space velocity of 510 h −1 , the selectivity and yield of DMC were higher than 86.0 % and 5.0 %, respectively.
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JOURNAL OF NANOPARTICLE RESEARCH
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2014
·Vol. 16
·期 9
·1-9
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IF 2.278
Cui Hongtao,Xue Junying,Ren Wanzhong,Wang Minmin
In this work, β-Ni(OH) 2 monolayer nanosheets were prepared in benzyl alcohol by a facile exfoliation-free sol–gel route. The hydrolysis reaction of metal ions was started with the ring-opening reaction of epoxide. The in situ modification of benzyl alcohol molecules on the surface of secondary growth unit of hydroxide allowed the formation of β-Ni(OH) 2 monolayer nanosheets and 100 % monolayer state of β-Ni(OH) 2 in the resultant suspension. As proven in the electrochemical measurement, the maximum specific capacitance of 1735 F g −1 was obtained at scan rate of 5 mV s −1 within potential window of 0.6 V in 6 mol l −1 KOH aqueous solution, which is equal to the theoretical value of β-Ni(OH) 2 . This high electrochemical performance is attributed to the complete exposure of every structure unit of β-Ni(OH) 2 to electrolyte. This work demonstrates that monolayer nanosheets can generate from the brucite-type nickel hydroxide through this bottom-up strategy although it had been theoretically considered to be impossible.
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FOOD CHEMISTRY
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2015
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IF 3.391
Mengshuo Li,Gang Hu,Yangyang Chen
This paper reports a method for evaluating antioxidant capacity based on the inhibitory effects of a macrocyclic Ni(II) complex-catalysed Briggs–Rauscher reaction. The macrocyclic Ni(II) complex NiL(ClO 4 ) 2 , in which L is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene, is a porphyrin-like compound, the structure of which can be found in certain enzymes. The experiments indicated that three natural compounds could temporarily quench the oscillations for a period of time prior to regeneration of oscillations. The inhibition time was related to the compound type and concentration; thus, procedures for evaluating the antioxidant activities of polyphenolic compounds were successfully established. Three polyphenolic compounds were tested to evaluate their antioxidant activities: protocatechuic acid, rutin hydrate and procyanidin. Of these three naturally occurring compounds, procyanidin was found to be the most efficient antioxidant. We have also discussed the reaction of the antioxidant with the hydroperoxyl radical (HOO ) present in the oscillating system.
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PubMed
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CHEMICAL ENGINEERING JOURNAL
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2015
·
IF 4.321
Chen Sun,Zimo Lou,Yu Liu,Ruiqi Fu,Xiaoxin Zhou,Zhen Zhang,Shams Ali Baig,Xinhua Xu
In this study, nanosized titanium nitride (nTiN) doped palladium/nickel (Pd/Ni) foam electrodes were prepared via electroless deposition method for the dechlorination of 2,4-dichlorophenoxyacetic acid (2,4-D). Characterization analyses including field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM) revealed that nTiN was successfully doped onto the electrode surface. 2,4-D was first dechlorinated to intermediate products p -chlorophenoxyacetic acid ( p -CPA) or o -chlorophenoxyacetic acid ( o -CPA) and then to the final product, phenoxyacetic acid (PA). The effects of environmental factors including initial 2,4-D concentration, current density, reaction temperature and dissolved anions were also studied. High initial 2,4-D concentration increased the efficient utilization of active hydrogen atom [H] by nTiN doped Pd/Ni foam electrodes. Increases in current density promoted better dechlorination efficiency while the hydrogen evolution side reaction was undesirably increased, leading to a lower average current efficiency. Higher reaction temperature was proved to be favorable for the enhancement of dechlorination efficiency. NO 3 − and reduced sulfur compounds including S 2− and SO 3 2− showed negative impacts on Pd catalytic capability, whereas CO 3 2− and Cl − exhibited less adverse effects on dechlorination efficiency. The activation energy ( E a) value of 2,4-D dechlorination by nTiN doped Pd/Ni foam electrode was calculated to be 32.06 kJ mol −1 . Two typical stages namely electrode activation and efficient dechlorination procedures occurred in 2,4-D dechlorination by nTiN doped Pd/Ni foam electrodes. The reaction paths of [H] on the electrode were also summarized. The removal efficiency of 2,4-D dechlorination on nTiN doped Pd/Ni foam electrodes was observed to slightly decrease from 100% to 89.95% after 5 consecutive experiments.
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SURFACE & COATINGS TECHNOLOGY
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2015
·
IF 1.998
Xiaogang Guo,Xueming Li,Hongru Li,Daixiong Zhang,Chuan Lai,Wulin Li
In this study, the nano-Al/Ni energetic composite coatings (ANECCs) have been successfully fabricated by the electrophoretic deposition (EPD) method at the room temperature and normal pressure. Isopropyl alcohol is demonstrated to act as the suitable dispersion agent for the EPD. The SEM and EDS results show that the obtained ANECCs are relatively smooth and evenly distributed. Both the phase constitution and exothermic behavior of the ANECCs are characterized by X-ray diffraction (XRD) and differential scanning calorimetry (DSC) analysis at the same while. In addition, the kinetics of the nanoparticles during the EPD process are investigated in detail. The exothermic performance of products studies show that the ANECCs prepared by EPD exhibit the great combustion performance and thermodynamic properties. Furthermore, the combustion processes of samples are recorded and analyzed by the high-speed photography. This work demonstrates that EPD method is a facile and effective approach in the preparation of Al/Ni energetic coatings with the widespread application.
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ACS Applied Materials & Interfaces
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2016
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IF 7.145
Hai-Bo Zhao,Zhi-Bing Fu,Hong-Bing Chen,Ming-Long Zhong,Chao-Yang Wang
Electromagnetic microwave absorption materials have attracted a great deal of attention. Foams for the low density and tunable porosity are considered as ideal microwave absorbents, while with the requirement of improving their inherent electromagnetic properties. In this manuscript, an innovative, easy, and green method was presented to synthesize an electromagnetic functionalized Ni/carbon foam, in which the formation of Ni nanoparticles and carbon occurred simultaneously from an affordable alginate/Ni2+ foam precursor. The resultant Ni/carbon foam had a low density (0.1 g/cm–3) and high Ni nanoparticles loading (42 wt %). These Ni nanoparticles with a diameter of about 50–100 nm were highly crystallized and evenly embedded in porous graphite carbon without aggregation. Also, the resultant foam had a high surface area (451 m2 g–1) and porosity and showed a moderate conductivity (6 S/m) and significant magnetism. Due to these special characteristics, the Ni/carbon foam exhibited greatly enhanced microwave absorption ability. Only with 10 wt % of functional fillers being used in the test template, the Ni/carbon foam based composite could reach an effective absorption bandwidth (below −10 dB) of 4.5 GHz and the minimum reflection value of −45 dB at 13.3 GHz with a thickness of 2 mm, while the traditional carbon foam and nano-Ni powder both showed very weak microwave absorption (the minimum reflection value < –10 dB). This foam was demonstrated to be a lightweight, high performance, and low filler loading microwave absorbing material. Furthermore, the detailed absorption mechanism of the foam was investigated. The result showed that the derived strong dielectric loss, including conductivity loss, interface polarization loss, weak magnetic loss, and naoporosity, contributes a great electromagnetic absorption.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2015
·
IF 2.999
Wenle Ma,Li Wang,Junying Xue,Hongtao Cui
Monolayer nanosheets of Co–Ni layered double hydroxides (LDHs) were synthesized by an ultra-large scale strategy under very moderate condition. The simple grinding of nickel nitrate hexahydrate and cobalt nitrate hexahydrate in morpholine at room temperature produced monolayer nanosheets. At least 40 g monolayer nanosheets can be produced in one batch. The capacity for the production of nanosheets is only limited by the facility used in the laboratory. The formation of monolayered hydroxide is attributed to the complete consumption of water in the water-deficient environment by the hydrolysis reaction between water and morpholine. The water consumption would consequently eliminate the possibility of interlayer hydrogen-bonding, avoiding the stacking of already produced monolayers. Because of the monolayer state of LDHs and the synergistic effect of cobalt ions in LDHs, the nanosheets presented high electrochemical performance.
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TALANTA
·
2017
·
IF 4.162
Qi Wang,Qian Zhou,Qicheng Zhang,Rongjia Shi,Shangshang Ma,Wenbo Zhao,Min Zhou
Preparation of high performance electrochemical biosensing interface for the sensitive and rapid detection of human metabolites is of great interest for health care and biomedical science. In this paper, based on the adhesion technique of marine mussels, we designed and prepared a novel biosensor with a micro/nano-biointerface of Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam, which offered a three dimensional (3D) living environment for real cell. The constructed biosensor with a 3D micro/nano-biointerface of Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and elemental mapping. Furthermore, the electrochemical experiments by electrochemical method for detection of superoxide anion (O 2 •− ) in situ released by cells were carried out by this biosensor we proposed. Results indicated that the 3D interface of mussel-inspired Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam offered an amicable platform for promoting cell adhesion, which was beneficial for enhancing biosensing activity. This proposed sensing platform provided high electroactivity and excellent electron transport with a lower detection limit (0.0170 μM), wider linear range 0.04–2.44 μM) and short diffusion distance to reaction sites. The case achieved the accurate detection of O 2 •− (in situ released by cells) based on the combination of mussel-inspired biomimetic adhesion technique, 3D micro/nano-biointerface construction and electrochemical biosensing technique.
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Materials Research Express
·
2017
·Vol. 4
·期 8
·085009
·
IF 1.068
Zongtang Liu,Chenggang Gu,Yongrong Bian,Xin Jiang,Yufeng Sun,Zhenghao Fei,Jingtao Dai
In this study, Fe/Ni bimetallic nanoparticles were supported on the attapulgite (A-Fe/Ni) to enhance the degradation reactivity of decabrominated diphenyl ether (BDE209) in aqueous solution. The Fe/Ni nanoparticles were well distributed on the attapulgite surface with an average diameter of 20–40 nm. The removal percentage of BDE209 by A-Fe/Ni was 1.59 times higher than Fe/Ni nanoparticles alone because attapulgite could act as supporting material to disperse Fe/Ni nanoparticles and prevent Fe/Ni nanoparticles from aggregation. The degradation kinetics for BDE209 debromination by A-Fe/Ni could be well described by a pseudo-first-order model, and the debromination rate constant of BDE209 increased with increasing the dosage of A-Fe/Ni, water/THF ratio, and decreasing the initial BDE209 concentration and solution pH. The degradation products were identified using a third-order polynomial regression equation between the experimental and reference gas chromatography relative retention times. Stepwise debromination from n-bromo-DE to (n − 1)-bromo-DE was a possible pathway with bromines being substituted sequentially by hydrogen. The preferred elimination of bromines of BDE209 by A-Fe/Ni followed the debromination preference of para-Br > meta-Br > ortho-Br. The results provide evidences for understanding the debromination mechanism of polybrominated diphenyl ether by clay-supported Fe/Ni nanoparticles.
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