ELECTROCHIMICA ACTA
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2019
·
IF 5.383
Qiujun Li,Hua Yao,Feng Liu,Zitao Gao,Yangyi Yang
A new Mn-doped coordination supramolecular network (CSN) was synthesized on nickel foam directly by a simple one-step hydrothermal method . Compared with the pure CSN electrode (∼2.46 C cm −2 at 10 mA cm −2 ), this Mn-doped binder-free electrode showed an ultrahigh areal capacity (∼8.12 C cm −2 at 10 mA cm −2 ). In addition, when the current density increased from 10 mA cm −2 to 50 mA cm −2 , it had a good rate capability with 73.33% capacitance retention. For practicality, an asymmetrical supercapacitor (ASC) was assembled by Activated Carbon (AC) electrode and the Mn-doped CSN electrode. The device not only could achieve a maximum energy density of 3.41 mW h cm −3 at the power density of 44.98 mW cm −3 , but also could exhibit excellent stability after 4000 cycles, with the capacitance retention of 90.14%. The above results indicate that the Mn-doped CSNs are promising electrode materials for supercapacitors in energy storage.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2019
·Vol. 19
·期 8
·4414-4428
·
IF 1.093
Liu Debao,Yang Ping
Metal-organic framework (MOF) has received much attention to prepare metal oxides, demonstrating many applications in sensing, catalysis and energy storage and conversion. Herein, a two-step procedure by a metal organic frameworks route was used fabricate ZnO dodecahedra, Co3O4
dodecahedra, ZnO/Co3O4 and Co3O4/NiO composites. The growth mechanisms for these unique structures are illustrated. As applications, ZnO dodecahedra perform remarkable sensitivity to ethanol in sensing experiments. The CO catalytic oxidation activity
of Co3O4 dodecahedra is employed and showed decreased catalytic performance with the increased calcinations temperature. ZnO/Co3O4 composites show enhanced electrochemical performance and photocatalytic activities, which result from its unique porous
structure, high specific surface area and the synergistic effect between ZnO and Co3O4. In addition, Co3O4/NiO composites show remarkable specific capacitance and excellent stability, superior to that of the pure Co3O4. Moreover,
this MOF-driven method could be utilizable to prepare other metal oxide for various applications.
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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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ACS Catalysis
·
2019
·
IF 12.221
Jian Li,Yaping Lin,Xiulian Pan,Dengyun Miao,Ding Ding,Yi Cui,Jinhu Dong,Xinhe Bao
Strong metal–support interaction (SMSI) has been widely recognized for platinum-group metals on reducible oxide supports. Herein we report that the catalytic activity of Ni catalyst in CO2 methanation is significantly suppressed over conventional anatase (a-TiO2) support due to the SMSI-induced formation of a titania overlayer around the Ni nanoparticles. Furthermore, CO is the only product . In contrast, the NH3-treatment and H2-treatment of the a-TiO2 support enhance remarkably the activity of Ni, i.e., CO2 conversion increases by 1 order of magnitude and CO2 is hydrogenated almost exclusively to CH4. X-ray photoelectron spectroscopy (XPS), H2 and CO chemisorption, and low temperature electron paramagnetic resonance (EPR) reveal that the enhanced CO2 methanation activity may be related with the Ti3+ species in the bulk that are generated by reduction treatment, which likely have altered the SMSI between Ni and a-TiO2 support. This simple reduction treatment approach may be applicable to modulate the SMSI of other reducible oxide-supported metal catalysts.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Yanpei Li,Xiangwei Wu,Jingyi Wang,Xingpeng Gao,Yingying Hu,Zhaoyin Wen
The sodium-nickel chloride (Na-NiCl 2 ) batteries technology has been considered as one of the most promising candidates for large-scale electrical energy storage application owing to its abundant electrode material resource, high energy density and safety. However, ultra-excessive Ni in the cathode leads to high material cost and the growth of cathode particles during cycles makes degradation of batteries performances, which hinder the further application of Na-NiCl 2 batteries. To address these challenges, we designed a free-standing Ni-less cathode with Ni/NaCl particles uniformly distributed in the three-dimensional (3D) conductive matrix constructed by carbonfiber (CF) and multiwalled carbon nanotubes (MWCNTs). The 3D hierarchical structure synthesized by low-cost vacuum filtration method can offer sufficient void space to accommodate the growth of NaCl particles and effectively enhance the electronic conductivity of the cathode. When the molar ratio of Ni/NaCl in the cathode is reduced to 1.0, a specific capacity of 90 mAh g −1 for planar Na-NiCl 2 batteries can be achieved after 170 cycles at 190 °C with a capacity retention of 67%, which is higher than that of traditional tubular Na-NiCl 2 batteries.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Shoujuan Lai,Chunxiao Lv,Shuai Chen,Ping Lu,Xilin She,Li Wan,Hongwei Wang,Jin Sun,Dongjiang Yang,Xiaoliang Zhao
Transition metal phosphides (TMPs) have been regarded as an alternative to Pt-based catalysts for hydrogen evolution reaction (HER) on account of their high performance and low cost. The ultrathin two-dimensional (2D) nanosheets of TMPs can expose abundant active sites and facilitate the transfer of mass/charge to enhance HER performance. However, the synthesis of ultrathin 2D nanosheets of TMPs is still a great challenge. Herein, we reported a novel and scalable strategy to prepare 2D ultrathin nickel phosphide nanosheets (∼2.5 nm) by using alginate as precursor through ice-templating process. The role of ice-templating is that the growth of the ice crystals would squeeze Ni-alginate into 2D nanosheets, and then forming Ni-alginate aerogels . The three-dimensional (3D) interconnected porous network of aerogels was advantageous to reduce the lattice strains of subsequent oxidation and phosphorization process. It is the key step to prepare 2D ultrathin nickel phosphides (Ni 2 P and Ni 5 P 4 ) nanosheets. As expected, all the prepared Ni 5 P 4 nanosheet aerogels displayed remarkable HER performance in 1 M KOH electrolyte. Especially, due to their ultrathin 2D nanosheets and high P percentage, the Ni 5 P 4 -500-350 sample with excellent long-term stability exhibits a low overpotential of 147 mV at current density of 10 mA cm −2 and a low Tafel slope of 57 mV dec −1 .
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 31
·期 1
·226-238
·
IF 2.195
Shen Yongqian,Wei Yupeng,Li Jian,Zhang Yuchen,Li Bin,Lu Xuefeng,Ji Binghan,Yan Pengze,Du Xueyan
Electromagnetic (EM) wave absorbing materials with superhydrophobic property and enhanced microwave absorbing ability are very important for the application of stealth technologies, especially in humid conditions. In the present work, the electrospinning technique was employed to fabricate NiAc/PVA nanofibers (NFs) from nickel acetate tetrahydrate (NiAc) and poly(vinyl alcohol) (PVA) solution as precursors, while the PVA component was further pyrolyzed and carbonized to obtain Ni/NiO/C NFs. Microwave absorption performance and EM parameters of the prepared NFs were then investigated from 2.0 to 18.0 GHz. Comparative studies between different samples elucidated not only the possible causes for lose mechanisms, but also impedance matching. According to the experimental results, when NiAc/PVA NFs contained 8% NiAc, the calcinated Ni/NiO/C NFs could achieve an optimum reflection loss of − 33.9 dB at 10.4 GHz under a thickness of 2.5 mm and exhibit an effective frequency bandwidth of 5.7 GHz. Furthermore, the membrane of Ni/NiO/C NFs with the best absorption property exhibited robust hydrophobicity and the contact angle was 144.9°, It shows that the obtained Ni/NiO/C NFs have a broad application prospect in waterproof stealth materials.
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ACS Nano
·
2019
·
IF 13.903
Hao Ren,Xiaoli Sun,Chengfeng Du,Jin Zhao,Daobin Liu,Wei Fang,Sonal Kumar,Rodney Chua,Shize Meng,Pinit Kidkhunthod,Li Song,Shuiqing Li,Srinivasan Madhavi,Qingyu Yan
Electrocatalysts are one of the most important parts for oxygen evolution reaction (OER) to overcome the sluggish kinetics. Herein, amorphous Fe–Ni–P–B–O (FNPBO) nanocages as efficient OER catalysts are synthesized by a simple low-cost and scalable method at room temperature. The samples are chemically stable, in clear contrast to reported unstable or even pyrophoric boride samples. The Fe/Ni ratio of the FNPBO nanocages can be continuously adjusted to optimize the OER catalytic performance. The FNPBO nanocages composed of multicomponent elements can weaken the metal–metal bonds, thus rearranging the electron density around the catalytic metal atom centers and reducing the energy barrier for intermediate formation. Hence the optimized FNPBO (Fe6.4Ni16.1P12.9B4.3O60.2) catalyst shows superior intrinsic electrocatalytic activity for OER. The low overpotential to afford the current density of 10 mA cm–2 (236 mV), the small Tafel slope (39 mV dec–1), and the high specific current density (26.44 mA cm–2) at a given overpotential of 300 mV make a sharp contrast to state-of-the-art RuO2 (327 mV, 136 mV dec–1, and 0.028 mA cm–2, respectively).
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IONICS
·
2020
·Vol. 26
·期 7
·3281-3288
·
IF 2.394
Yang He,Chang Limin,Wang Limin,Yin Dongming,Wang Duo,Cheng Yong
The advanced electrode construction consisting of Ni foam uniformly covered by layered ZnO microspheres (ZnO@Ni LMs) is successfully assembled by a simple thermal treatment process followed by a mild annealing treatment, which can be directly used as a binder-free electrode for lithium-ion batteries (LIBs). The as-synthesized ZnO@Ni LMs consist of numerous nanoparticles, leaving abundant porous to mitigate the volume changes between charge-discharge process. Remarkably, binder-free electrode circumvents the addition of insulating material (binder) and inhomogeneous distribution of conductive carbon material on current collector. When evaluated as binder-free electrode for LIBs, ZnO@Ni LMs deliver a superior specific capacity (1144 mA h g −1 at 100 mA g −1 ), brilliant rate capability, and excellent cycling ability (565 mA h g −1 at 100 mA g −1 after 100 cycles).
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 9
·3029-3039
·
IF 7.059
Peitao Xie,Yifan Li,Qing Hou,Kunyan Sui,Chunzhao Liu,Xueyan Fu,Jiaoxia Zhang,Vignesh Murugadoss,Jincheng Fan,Yanpeng Wang,Runhua Fan,Zhanhu Guo
One-dimensional wires are the most common building blocks in metamaterials. In this study, zero-dimensional nanoparticles connected by tunneling networks were used to construct metamaterials, thus providing a more flexible alternative for designing the geometrical configuration of metamaterials, particularly in nanodevices. The composites with nickel nanoparticles@MnO were prepared by a bio-gel derived strategy. Nickel nanoparticles were not connected geometrically, but the conductive network had been already formed, which was a tunneling-dominated percolative phenomenon demonstrated by the first-principles calculation. Negative permittivity was achieved in the composites, as the low-frequency plasmonic state could be generated in the tunneling nickel-networks. At the same time, negative susceptibility was observed due to the diamagnetism of the tunneling current loops. Electromagnetic simulations indicate that the composites have the potential for electromagnetic shielding (only 0.25 mm in thickness). It is believed that this study not only fills up the research gap in the influence of the tunneling effect on negative electromagnetic parameters but also opens up another way of preparing metamaterials by using zero-dimensional nanoparticles instead of one-dimensional wires.
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CATALYSIS LETTERS
·
2019
·Vol. 150
·期 6
·1591-1604
·
IF 2.372
Du Boyu,Chen Changzhou,Sun Yang,Liu Bingyang,Yang Yingying,Gao Si,Zhang Zhenshu,Wang Xing,Zhou Jinghui
Abstract Catalytic depolymerization of lignin to produce bio-oil, liquid fuels, and aromatic chemicals in high yields is important for a biorefinery to remain competitive. In this study, undoped and Ni-doped catalysts for depolymerization of rice husk lignin (RHL) were developed and analyzed. The results showed that the catalysts had hydrotalcite-like structures with lamellar morphology. With suitable Ni-doping amount, the catalysts had high activity, thus better promoted the depolymerization of RHL. Among all catalysts, the Ni1/4MgAl catalyst could best promote the cleavage of the β-O-4 aryl ether bond in RHL molecule and thus could substantially increase the yields of bio-oil. The depolymerization catalyzed by this catalyst was also found to be temperature-, time-, and solvent-dependent. This study provides information that can be beneficial to the biorefinery industries and may help promote the valorization of lignin. Graphic Abstract
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ELECTROCHIMICA ACTA
·
2019
·
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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