ELECTROCHIMICA ACTA
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2019
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IF 5.383
Liting Zheng,Shaoshuai Ma,Zihua Wang,Yunhui Shi,Qian Zhang,Xinhua Xu,Qiang Chen
This study accounts the controllable design over the structure and morphology of Ni-P nanomaterials directly growing on cellulose paper, and its excellent non-enzymatic electrocatalytic performance to urea. The Ni-P papers were prepared by simple solution soaking and electroless bathing. And the simple experimental steps and mild experimental conditions make it possible for large-scale industrial production, and potential for practical applications. In addition, tuning the pH and concentration of the electroless bath, the Ni-P nanomaterials with different morphologies of nanoflower , nanosheet , nanowire microsphere and microsphere were obtained. The Ni-P nanomaterials impart conductivity to cellulose paper while being potently sensitive to urea owing to its high catalytic activity. Cellulose paper has a large specific area and open macroporous framework which hadn't been damaged during the process of electroless bathing, providing much more activated sites for Ni-P deposition. And the prepared Ni-P papers, as composite materials of cellulose papers loading Ni-P nanomaterials, have high electrocatalytic properties to urea. Comparing the electrochemical behaviors of the four Ni-P paper electrodes with different morphologies, the Ni-P nanoflower paper electrode showed the best electrochemical performance with highest sensitivity of 683.46 μA mM −1 cm −2 in the low concentration range (0–1 mM) and 1140 μA mM −1 cm −2 in the high concentration range (1–11 mM), lowest detection limit of 12 μM, shortest response time of 3 s, which may owes to the highest surface area of the Ni-P nanoflower structure. It also has a good stability in room environment remaining 97% after 35 days of storage. Moreover, the electrocatalytic activities of the four Ni-P paper electrodes are ranked as follows: nanoflower > nanosheet > nanowire microsphere > microsphere. What's more, the long-term stability and repeatability, good selectivity of the flexible Ni-P paper make it successfully applied to swimming pool water quality monitoring.
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高影响因子
ACS Applied Materials & Interfaces
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2019
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IF 8.456
Luyang Liang,Gaojie Han,Yang Li,Biao Zhao,Bing Zhou,Yuezhan Feng,Jianmin Ma,Yaming Wang,Rui Zhang,Chuntai Liu
Electromagnetic (EM) pollution affecting people’s normal lives and health has attracted considerable attention in the current society. In this work, a promising EM wave absorption and shielding material, MXene/Ni hybrid, composed of one-dimensional Ni nanochains and two-dimensional Ti3C2Tx nanosheets (MXene), is successfully designed and developed. As expected, excellent EM wave absorption and shielding properties are obtained and controlled by only adjusting the MXene content in the hybrid. A minimum reflection loss of −49.9 dB is obtained only with a thickness of 1.75 mm at 11.9 GHz when the MXene content is 10 wt %. Upon further increasing the MXene content to 50 wt %, the optimal EM shielding effectiveness (SE) reaches 66.4 dB with an absorption effectiveness (SEA) of 59.9 dB. Mechanism analysis reveals that the excellent EM wave absorption and shielding performances of the hybrid are contributed to the synergistic effect of conductive MXene and magnetic Ni chains, by which, the dielectric properties and electromagnetic loss can be easily controlled to obtain appropriate impedance matching conditions and good EM wave dissipation ability. This work provides a simple but effective route to develop MXene-based EM wave absorption and shielding materials. A universal guideline for designing the absorbing and shielding materials for the future is also proposed.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jiaojiao Tan,Jiaming Wang,Ziyang Zhang,Zhi Ma,Luhui Wang,Yuan Liu
To improve the catalytic activity of CO 2 methanation at low temperature, a series of Ni/ZrO 2 catalysts with different Ni loadings were prepared by citrate complexing method. Based on the optimal Ni loading of 6 wt%, a certain amount of MgO was doped to improve the thermal stability of Ni/ZrO 2 catalyst. When Ni/Mg molar ratio was 4, there was the best performance, getting as high as 90% CO 2 conversion and nearly 100% CH 4 selectivity at 250 °C, 0.1 MPa and a WHSV of 15,000 ml g −1 h −1 , and the equilibrium CO 2 conversion was obtained at 300 °C. XRD , BET, TPR, CO 2 -TPD, H 2 -TPD, XPS , TG and TEM were conducted to investigate the reason of high activity of Ni/ZrO 2 catalyst at low temperature and the effect of doping MgO. Results suggested that highly dispersed Ni nanoparticles are responsible for the excellent catalytic activity. MgO can effectively improve stability of Ni-based catalysts by the confinement effect. Meanwhile, it is also found that there are little improvements on catalytic activity after doping MgO, and the TOF of catalysts with different MgO doping is basically the same, indicating CO 2 can be efficiently adsorbed and activated on the monoclinic ZrO 2 , and MgO do not contribute to the intrinsic activity.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jixue Zhou,Guochen Zhao,Jinshang Li,Jie Chen,Suqing Zhang,Jin Wang,Frank C. Walsh,Shuncai Wang,Yanpeng Xue
Weak hierarchical rough structures on superhydrophobic surfaces hinder their practical industrial applications. This paper reports a strategy to fabricate robust nickel-based superhydrophobic coatings via the codeposition of nanosized WS 2 and WC particles. The Ni/WC/WS 2 composite coatings were synthesized on mild steel substrates by one-pot electroplating followed by the adsorption of stearic acid self-assembled monolayers to modify the surface wetting. The particle concentration in the bath was investigated and the maximum water contact angle of approx. 170° was achieved by optimizing the particle contained. Hardened by WC and lubricated by WS 2 inclusions the superhydrophobic coatings showed remarkable abrasive resistance with a bearing capacity ≥10,000 mm abrasion length. The coatings also showed aerophilic behavior and good environmental stability over >6 months.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Yongchang Jiang,Jiabang Wang,Qilong Zhang,Hui Yang,Da Shen,Fuming Zhou
Dielectric polymer nanocomposites have been attracting increasing attention because of their wide range of applications in electronics industry. To improve their dielectric properties , incorporating conductive fillers and ceramic fillers into the polymer matrix is considered to be an effective solution. Here, Ni nanoparticles (about 50–90 nm) were decorated onto the surface of polydopamine (PDA) coated BaTiO 3 nanowires to synthesize Ni@polydopamine@BaTiO 3 nanowires (Ni@PDA@BT NWs, also denoted as NPB) with different Ni loading amount. The nanowires were then added into poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) matrix and composite films were prepared. The dielectric performance of composite films is largely enhanced owing to the microcapacitor effect and interfacial polarization effect induced by Ni nanoparticles. This enhancement can be improved by increasing the loading amount of Ni. Crystallization behavior of the films were also investigated. With 20 vol% of Ni@PDA@BT NWs added, the dielectric constant of the composite film reaches 48.4 at 1 kHz, in contrast to 29.5 for 20 vol% of BT and 10.6 for pristine P(VDF-HFP). And the dielectric loss tangent remains at a low level of 0.23 at 1 kHz. These composite films exhibit potential for applications in flexible electronic devices and electrical systems.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Xiaolong Han,Hexiang Sun,Liangliang Liu,Yuqi Wang,Gaohong He,Jiding Li
Incorporation of MOF particles into polymer matrix is an effective approach to prepare mixed matrix membranes (MMMs) with high selectivity and high permeability for pervaporation. In this article, regularly distributed CPO-Z7-Ni particles filled polydimethylsiloxane (PDMS) MMMs were prepared and used for pervaporation desulfurization. Benefiting from well-defined pore structures, high surface area, good compatibility with PDMS matrix and excellent thiophene adsorption capacity of the prepared CPO-27-Ni particles, both total flux and sulfur enrichment factor of the CPO-27-Ni/PDMS MMMs were remarkably increased. When the loading of CPO-27-Ni was 6 wt%, the optimal pervaporation performance was achieved with a flux of 5.92 kg/(m 2 ·h) and an enrichment factor of 4.05. These increased by 68.7% and 23.7% versus pristine PDMS membrane, respectively. It is proved that the incorporation of CPO-27-Ni particles into PDMS matrix can overcome the “trade-off” phenomenon between flux and sulfur enrichment factor, which is very important for pervaporation desulfurization.
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高影响因子
Chemical Science
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2019
·Vol. 10
·期 12
·3556-3566
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IF 9.556
Yanan Liu,Alan J. McCue,Pengfei Yang,Yufei He,Lirong Zheng,Xingzhong Cao,Yi Man,Junting Feng,James A. Anderson,Dianqing Li
The impregnation method is commonly employed to prepare supported multi-metallic catalysts but it is often difficult to achieve homogeneous and stable alloy structures. In this work, we revealed the dependence of alloying behavior on the support morphology by fabricating Ni–Cu over different shaped CeO2. Specifically, nanocube ceria favoured the formation of monometallic Cu and Ni-rich phases whereas polycrystalline and nanorod ceria induced the formation of a mixture of Cu-rich alloys with monometallic Ni. Surprisingly, nanopolyhedron (NP) ceria led to the generation of homogeneous Ni–Cu nanoalloys owing to the equivalent interactions of Ni and Cu species with CeO2 (111) facets which exposed relatively few coordinative unsaturated sites. More importantly, a strong interfacial effect was observed for Ni–Cu/CeO2-NP due to the presence of CeOx adjacent to metal sites at the interface, resulting in excellent stability of the alloy structure. With the aid of CeOx, NiCu nanoalloys showed outstanding catalytic behaviour in acetylene and hexyne hydrogenation reactions. This study provides valuable insights into how fully alloyed and stable catalysts may be prepared by tailoring the support morphology while still employing a universal impregnation method.
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高影响因子
APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Yue Du,Guangxing Pan,Li Wang,Yonghai Song
Here, a series of low-cost Co x Ni y P nanoparticles embedded in N-doped porous carbon stood up on Ni foam nanocomposites (Co x Ni y P@NC/NF) were prepared as efficient catalysts for hydrogen evolution reaction (HER) by a low temperature hydrothermal and phosphating method. Characterization of various techniques indicated the Co x Ni y P nanoparticles with about 5 nm in diameter were uniformly embedded in NC to form Co x Ni y P@NC nanosheets with thickness of 20–400 nm. The NC was composed of graphene and the Co x Ni y P@NC nanosheets stood up on NF in crisscross fashion. The electrochemical results showed that the Co x Ni y P@NC/NF nanocomposites showed high catalytic activity for HER in alkaline solution and its catalytic activity depended on the ratio of Co:Ni. At the ratio of Co:Ni of 4:1, the Co 4 NiP@NC/NF presented best HER performances with the overpotential of 70 mV at 10 mA cm −1 , better than commercialized Pt. The Co 4 NiP@NC/NF also displayed a wonderful Faraday efficiency of 95%, suggesting that it could effectively convert electrical energy into chemical energy in HER. The catalytic activity of Co 4 NiP@NC/NF remained unchanged in 35 h, indicating the Co 4 NiP@NC/NF possessed good stability. The excellent HER performances might make it be a substitute for precious metal catalysts for hydrogen production.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Shuo Li,Xianlang Chen,Jing Wang,Nan Yao,Jianguo Wang,Jie Cen,Xiaonian Li
The reduction of the size and modification the surface of Ni 0 are generally used to improve the hydrogenation performances of Ni-based catalysts. In this work, a new method derived Ni 0 @carbon nanostructure was constructed on SiO 2 in order to explore an alternative way to improve the intrinsic activity of Ni 0 in the selective hydrogenation of p-chloronitrobenzene ( p -CNB). The experimental and computational results exhibit that the synergistic effect between Ni 0 core and nitrogen-doped carbon shell (Ni 0 @C-N) can dissociate more hydrogen on larger Ni 0 core (~14 nm) than Ni 0 @C (Ni 0 ≈ 11 nm), while the external surface of carbon shell facilitates the oblique adsorption of p -CNB and the consequent hydrogenation. Such formed dual-reaction surfaces inhibit the dechlorination reaction but increase the active hydrogen species. Consequently, Ni 0 @C-N/SiO 2 catalyst (~14 nm) adversely displays ~2.3-fold higher turnover frequency and ~100% p -chloroaniline selectivity , in contrast to Ni 0 @C/SiO 2 (~11 nm) and the commercial Raney Ni (~6 nm) catalysts.
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高影响因子
CHEMOSPHERE
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2019
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IF 5.108
Guangshan Zhang,Yanei Xue,Qiao Wang,Peng Wang,Hong Yao,Wen Zhang,Jinbo Zhao,Yang Li
Norfloxacin (NOR) is an emerging antibiotics contaminant due to its high resistance to microbial degradation and natural weathering. In this study, Fe-doped ZnS photocatalyst (Zn 0.9 Fe 0.1 S) was deposited on nickel foam (Ni-foam) to improve photocatalytic activity under visible light irradiation. The mass ratio of Zn 0.9 Fe 0.1 S and Ni-foam was optimized to be 0.03 g catalyst versus per g Ni-foam (0.03 Zn 0.9 Fe 0.1 S/Ni-foam), which led to the highest removal rate of 95%. The optimal degradation condition for NOR over 0.03 Zn 0.9 Fe 0.1 S/Ni-foam was pH at 7.0, initial NOR concentration of 5 mg L −1 , and initial photocatalyst concentration of 11.7 g L −1 , with the highest first-order reaction rate constant of 0.025 min −1 and mineralization rate of 63.1%. The NOR removal rate on 0.03 Zn 0.9 Fe 0.1 S/Ni-foam photocatalyst (95%) was approximately four times of that obtained on Zn 0.9 Fe 0.1 S photocatalyst (25%). The increased photocatalytic performance could be attributed to the function of Ni-foam as excellent electron collectors that provided efficient photoinduced charge separation from Zn 0.9 Fe 0.1 S. The reactive species responsible for the degradation of NOR were photo-generated holes, hydroxyl radical , and superoxide radicals. Nearly 90% of the photocatalytic efficiency was retained over seven cycles and the released metal ion concentrations were <0.3% of the total mass of photocatalyst, suggesting high stability of the photocatalyst during the photocatalytic reactions. The aqueous/solid mass transfer and intraparticle mass transfer for Zn 0.9 Fe 0.1 S/Ni-foam were not limiting factors for the degradation of NOR. Therefore the Zn 0.9 Fe 0.1 S/Ni-foam photocatalyst could be applied in the degradation of hazardous pollutants .
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Zhihao Yue,Siyu Yao,Yuanzhen Li,Wenxin Zhu,Wentao Zhang,Rong Wang,Jing Wang,Lunjie Huang,Dongyang Zhao,Jianlong Wang
In order to resolve the pollution and waste caused by urea-rich wastewater, designing superior and stable earth-abundant catalysts for urea oxidation reaction (UOR) have always been attractive and urgent but still challenging. Herein, we report on a facile surface-engineering strategy of building hierarchical nickel hydroxide nanosheet@nanowire array on Ni foam (Ni(OH) 2 NS@NW/Ni foam) as anode material toward superior urea electrolysis. This Ni(OH) 2 based-catalyst with peculiar nanosheet@nanowire configuration just requires a small potential of 0.34 V ( vs. SCE) to drive 10 mA cm −2 in 1.0 M KOH with 0.33 M urea, which outperforms the one with pure nanosheet array architecture and even the commercial Pt/C catalyst. Further, a two-electrode electrolysis system is built here with the cathode of cobalt phosphide nanowire array on Ni foam (Co 2 P NW/Ni foam) and anode of Ni(OH) 2 NS@NW/Ni foam for overall urea electrolysis, which needs a low voltage of 1.58 V to drive 5 mA cm −2 in 1.0 M KOH with 0.33 M urea. Note that, the current density presented in this work is based on the real surface area of Ni foam but not the geometric area, unless otherwise specified.
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高影响因子
ACS Applied Nano Materials
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2018
·
IF 0
Shengshuai Gao,Qingda An,Zuoyi Xiao,Shangru Zhai,Dongjiang Yang
Microwave absorption materials with great reflection loss and wide absorption band that can provide electromagnetic waves (EMWs) absorption with minimal thickness are highly desirable, particularly when they could be controllably fabricated through a facile process. Herein, N-doped three-dimensional (3D) carbonaceous composites with highly dispersed nickel nanoparticles (N-SA/Ni-X, X = 3%, 6%, 9%) were successfully prepared by a facile one-step encapsulation process and carbonization. The performance of the absorber has a significant enhancement due to the introduction of nitrogen elements into a carbon network for controlling the dispersion and size distribution of Ni nanoparticles. When a 6% Ni2+ mass percentage was used, the maximum reflection loss (RL) could reach −42.2 dB at 9.8 GHz. Moreover, the effective absorption (below −10 dB) bandwidth can be increased by 2.3 GHz, from 8.5 to 10.8 GHz, with the absorber thickness of only 2 mm, and it can be tuned from 2.8 to 14.4 GHz by adjusting the thickness from 1.5 to 5 mm. The excellent electromagnetic-wave-absorbing performance could be assigned to the combinatorial advantages of the lightweight conductive porous network with favorable dielectric loss and magnetic loss features induced by highly dispersed Ni nanoparticles. These newly fabricated N-SA/Ni-X composites could be regarded as promising candidates for lightweight and high-performance microwave absorption materials.
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