NANOTECHNOLOGY
·
2019
·Vol. 30
·期 41
·415602
·
IF 3.399
Na Wang,Min Zhang,Libin Liu,Jing Zheng,Jingli Xu,Tasawar Hayat,Njud S. Alharbi
A unique nanostructure of Fe3O4 nanoparticles (NPs)-in/carbon layer/out-Ni NPs was developed and proved to be an efficient catalyst and protein adsorbent. This kind of nanostructure was formed through a space-confined pyrolysis procedure using polydopamine-Ni2+ coated Fe-NTA nanowires as the precursor. A N-doped carbon interlayer derived from polydopamine (PDA) supported a large amount of Ni NPs and entrapped well-defined Fe3O4 NPs, which were obtained through reduction of Ni2+, Fe3+ by carbonized NTA groups and a PDA layer. The contributions of the unique configuration along with the high density of Ni NPs in Fe3O4@C-Ni are significant for improving catalysis and protein adsorption performance, which is expected to be a promising alternative to other conventional catalysts and protein adsorbents. Due to the unique novel nanostructure, this nanocomposite possesses a wide range of applications, not only for catalytic reactions but also for other inhomogeneous reactions.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 16
·9791-9797
·
IF 10.733
Kai Deng,You Xu,Dandan Yang,Xiaoqian Qian,Zechuan Dai,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
The structure- and composition-controlled synthesis of Pt-based nanocatalysts is highly important for improving their catalytic performance while reducing the overall use of precious Pt. Here, an effective strategy is developed to combine surface porosity, hollow cavities and metal–nonmetal incorporation engineering on Pt, resulting in ternary Pt–Ni–P mesoporous nanocages (Pt–Ni–P MNCs). Owing to the mesoporous surface, hollow structure and synergistic electronic effects derived from Pt, Ni, and P elements, the as-prepared Pt–Ni–P MNCs exhibit excellent electrocatalytic activity and long-term stability for both the oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR), enabling them to be promising ORR–MOR bifunctional electrocatalysts for direct methanol fuel cells.
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JOURNAL OF MATERIALS RESEARCH
·
2019
·Vol. 34
·期 14
·2445-2455
·
IF 1.982
Uwamahoro Evariste,Guohua Jiang,Bo Yu,Yongkun Liu,Zheng Huang,Qiuling Lu,Pianpian Ma
In this work, hierarchical mesoporous Zn–Ni–Co–S–rGO/NF microspheres have been prepared by hydrothermal, sulfurization, and subsequent calcination process. The effect of different sulfurization time on the morphology and capacitance of composites was tested. The high electrochemical performance of (Zn–Ni–Co–S–rGO/NF) composite was obtained when the sulfurization time was 3 h (Zn–Ni–Co–S–rGO/NF-3h), where a specific capacitance of 627.7 F/g at 0.25 A/g and excellent rate capability of about 97.8% capacitance retention at 2 A/g after 4000 cycles were achieved. Moreover, an asymmetric supercapacitor fabricated by (Zn–Ni–Co–S–rGO/NF-3h) composite and activated carbon (AC) as the positive and the negative electrodes, respectively, showed a high energy density of 75.96 W h/kg at a power density of 362.49 W/kg with a remarkable cycle stability performance of 91.2% capacitance retention over 5000 cycles. This incredible electrochemical behavior illustrates that the hierarchical mesoporous Zn–Ni–Co–S–rGO/N-3h microsphere electrodes are promising electrode materials for application in high-performance supercapacitors.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Weilai Wang,Junfeng Niu,Zhifeng Yang
Presence of unsaturated bonds and halogen-containing groups is the most common characteristic of toxic and harmful environmental pollutants. Herein, catalytic hydrogenation was chosen as a water quality control method for such contaminants. Considering the safety, availability and activity of the hydrogen source, electrochemical in situ hydrogen generation was introduced. Under the combined action of Raney Ni (R-Ni) and nascent hydrogen (Nas-H 2 ), three compounds (50 mg L −1 , 90 ml), i.e., acrylamide, 2, 6-dibromo-4-nitrophenol and 2-chloro-4-fluorobenzonitrile achieved complete hydrogenation reduction in a short time. The improved system realized the quantitative consumption of hydrogen source and the efficient operation of hydrogenation reaction under mild conditions. Additionally, the alkaline environment formed by hydrogen evolution reaction (HER) avoided secondary pollution caused by catalyst dissolution. Atomic hydrogen (H·) produced from R-Ni and Nas-H 2 was the active free radical of the reaction. The hydrogenation activities of different functional groups were obtained according to the following order: Ph-NO 2 ＞ -C = C- ＞ Ph-C≡N ＞ Ph-Br ＞ Ph-Cl ＞ Ph-F. This work indicates that the catalytic hydrogenation system consisting of R-Ni and Nas-H 2 is a promising technology to reduce unsaturated bonds and halogen-containing groups.
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ACS Applied Energy Materials
·
2020
·
IF 4.473
Yin’an Zhu,Ye Pan,Weiji Dai,Tao Lu
Electrochemical splitting of water to hydrogen is widely considered as an efficient and sustainable solution to relieve the energy crisis. In this work, we report a facile dealloying method based on metallic glass (Ni61Zr36Mo3) to introduce abundant oxygen vacancies (Ov) for the electrocatalytic hydrogen evolution reaction (HER). The corroded ribbons are composed of a sandwich-like structure with Ni–Mo–O nanoporous layer outside and raw metallic glass inside. This complex structure delivers a low overpotential of 71 ± 2.6 mV at −20 mA cm–2geo in 1.0 M KOH solution, a Tafel slope of 57 ± 3 mV dec–1, and 100 h long-term stability for HER, which is much better than those of the crystallized counterpart, nanoporous Ni, and the commercial benchmark 20% Pt/C electrocatalyst. The high concentration of oxygen vacancies (71.5%), the alloying effect of Mo, and amorphous composition synergistically contribute to the superior electrocatalytic ability and enhanced reaction kinetic of nanoporous Ni–Mo–O, indicating it an excellent low-cost alternative for platinum in hydrogen production.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Fei Ma,Xiaoqiang Dai,Jie Jin,Ning Tie,Yatang Dai
Despite cobalt molybdenum sulfide (CoMoS 4 )-based materials are a prospective class of electrode material for supercapacitors , their relatively inferior rate capability and cyclic stability have severely restricted practical applications. Engineering multicomponent binder-free electrode material is deemed an effective approach to fulfill the demand of high-performance supercapacitors. Herein, the hierarchical core-shell hollow CoMoS 4 @Ni–Co–S nanotubes supported on flexible carbon cloth are designed through a scalable hydrothermal method combined with electrodeposition process. Due to the synergistic contribution of highly conductive CoMoS 4 nanotubes core and highly active nickel cobalt sulfide nanosheets shell, the 3D hierarchical CoMoS 4 @Ni–Co–S nanotubes electrode achieves a remarkable specific capacitance of 2208.5 F g −1 at a rate of 1 A g −1 and extraordinary cycling life (91.3% capacitance retention over 5000 cycles at 3 A g −1 ). Moreover, the assembled CoMoS 4 @Ni–Co–S//activated carbon (AC) asymmetric supercapacitor presents satisfactory electrochemical performance, delivering an energy density of 49.1 W h kg −1 at a high power density of 800 W kg −1 and competitive cyclic stability (90.3% retention of initial capacity after 10000 cycles). This work designs an effective synthetic route and validates the potential prospects of binder-free 3D hierarchical architecture for developing high-performance and advanced energy storage devices.
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ENERGY & FUELS
·
2019
·
IF 3.021
Bingxing Jiang,Jun Hu,Yiheng Qiao,Xiaoxiang Jiang,Ping Lu
Performance of Ni–Pd bimetallic catalysts on depolymerization of lignin into monomeric phenols was investigated using isoproponal as an in situ hydrogen source. The performance of catalysts and the effects of temperature and starting lignins were extensively examined. Ni50Pd50/SBA-15 exhibited the best performance in the depolymerization of cellulolytic enzyme corn stalk lignin, affording the highest total monophenols yield of 8.14 wt % which was 1.96 times that of Ni/SBA-15 and 1.44 times that of Pd/SBA-15. For the depolymerization of acid-extracted birch lignin, 18.52 wt % monophenols were obtained over Ni50Pd50/SBA-15 at 245 °C for 8 h, and 4-propylsyringol had 8.89 wt % yield with 47.97% selectivity. The physicochemical characteristics of the catalysts were elucidated with ascanning electron microscopy, high-resolution transmission electron microscopy, nitrogen adsorption/desorption, X-ray diffraction, and X-ray photoelectron spectroscopy. The bimetallic catalyst had the characteristics of narrow distribution of metal particles with a small size, well-retained hexagonal pore structure of SBA-15, higher dispersion of Pd, and more Pd0 and Ni0 as compared with monometallic catalysts. The properties of the bimetallic catalyst provide more contact opportunities between the abundant active centers and lignin fragments, and therefore significantly promote the hydrogenolysis process to produce monomeric phenols.
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NANO
·
2019
·
IF 1.293
Yanwei Sui,Man Zhang,Haihua Hu,Yuanming Zhang,Jiqiu Qi,Fuxiang Wei,Qingkun Meng,Yezeng He,Yaojian Ren,Zhi Sun
The interconnected three-dimensional Ni–Co–S nanosheets were successfully deposited on ZnO nanorods by a one-step potentiostatic electrodeposition. The Ni–Co–S nanosheets provide a large electrode/electrolyte interfacial area which has adequate electroactive sites for redox reactions. Electrochemical characterization of the ZnO@Ni–Co–S core–shell nanorods presents high specifc capacitance (1302.5 F/g and 1085 F/g at a current density of 1 A/g and 20 A/g), excellent rate capabilities (83.3% retention at 20 A/g) and great cycling stability (65% retention after 5000 cycles at a current density of 30 A/g). The outstanding electrochemical performance of the as-prepared electrode material also can be ascribed to these reasons that the special structure improved electrical conductivity and allowed the fast diffusion of electrolyte ions.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jingwei Li,Peiman Xu,Rongfu Zhou,Ruchun Li,Lijun Qiu,San Ping Jiang,Dingsheng Yuan
Large-scale commercialization of water splitting is still challenging due to the lack of efficient, cost-effective and robust electrodes. In this work, Co 9 S 8 –Ni 3 S 2 heterointerfaced nanotubes on Ni foam (Co 9 S 8 –Ni 3 S 2 HNTs/Ni) have been successfully developed via a two-step hydrothermal method as a highly efficient, robust and flexible bifunctional electrodes for water splitting. Co 9 S 8 –Ni 3 S 2 HNTs are composed of inner 1D Co 9 S 8 nanotubes surrounded by outer 2D Ni 3 S 2 nanosheets . Co 9 S 8 –Ni 3 S 2 HNTs/Ni electrode achieves 10 mA cm −2 at overpotentials of 85 mV for H 2 evolution reaction (HER) and 50 mA cm −2 at overpotential of 281 mV for O 2 evolution reaction (OER) in 1 M KOH solution, substantially better than that on single-phased Co 9 S 8 nanotubes and Ni 3 S 2 nanosheets on Ni foam. The reason is most likely due to formation of defect-rich heterointerfaces between Co 9 S 8 nanotubes and Ni 3 S 2 nanosheets, and the significant change of binding energies of Co 2p and Ni 2p level between the Co 9 S 8 and Ni 3 S 2 , leading to the synergistic effect on the enhanced catalytic activity for HER and OER. The robust and flexibility of Co 9 S 8 –Ni 3 S 2 HNTs/Ni electrodes are demonstrated in an alkaline electrolyzer, delivering 10 mA cm −2 electrolysis current at a cell voltage of 1.59 V, one of the best bifunctional electrodes for water splitting. Owing to the fact that reaction occurs at the defects-rich heterointerfaces, the Co 9 S 8 -Ni 3 S 2 HNTs/Ni electrodes are structurally very stable.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Jinqiong Xu,Tingting Chen,Xiujuan Qiao,Qinglin Sheng,Tianli Yue,Jianbin Zheng
A novel non-enzymatic electrochemical sensor based on gold nanoparticles/nicke hydroxide nanosheet (AuNPs/Ni(OH) 2 NS) nanocomposite was successfully fabricated and further used for glucose sensing. The morphology and composition of AuNPs/Ni(OH) 2 NS were characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. The electrochemical properties were evaluated through cyclic voltammetry and amperometric methods. The AuNPs/Ni(OH) 2 NS/GCE exhibited wide linear range (0.002–6.0 mM), a low detection limit (0.66 μM) and good reproducibility and stability. The sensor was successfully employed for glucose detection in food samples for which the sensor displayed high performance with excellent reproducibility and recovery in complex food materials.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Jiamin Yu,Jian Zhang,Shiying Song,Hai Liu,Zizhang Guo,Chenglu Zhang
Activated carbon (AC) derived from Phragmites Australis (PA) with phosphoric acid activation as a low-cost adsorbent is extensively used in water treatment. In this study, a novel manganese formate hydrate (MFH) in-situ modified activated carbon (AC-MFH) has been proposed and investigated. The physical and chemical characteristics of adsorbents were characterized by N 2 adsorption/desorption, Fourier transform infrared (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results showed that AC-MFH had more microporous structures and surface oxygen-containing functional groups than AC. The Ni(II) adsorption behaviors of adsorbents were investigated by batch experiments, the results suggested that AC-MFH showed 20% higher Ni(II) adsorption capacity than that of AC and the associated adsorption isotherms and kinetics well fitted to the Langmuir model and pseudo-second-order model, respectively. The Ni(II) adsorption mechanisms of AC-MFH were investigated by FTIR and XPS analysis. These results indicated that the adsorption of Ni(II) mainly depended on the surface chemistry between the Ni(II) and surface oxygen-containing functional groups.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Fu Yang,Bo Shao,Xianfeng Liu,Shuying Gao,Xu Hu,Man Xu,Yun Wang,Shijian Zhou,Yan Kong
Multiple catalytic active centers tactically generated on the 2-dimentional catalytic carrier could afford certain promoting function thanks to their existed special synergy. Herein, Ni-based nanosheet-like metasilicate catalytic materials were developed as heterogeneous catalysts towards styrene oxidation for the first time. Concurrently, the special heteroatom cobalt or magnesium-incorporated Ni-based nanosheet-like metasilicate were developed together via the proposed synthesis tactics. The resulted sheet-like nanomaterials were meticulously characterized and identified through valid techniques. The introduction of heteroatom metal elements of cobalt or magnesium incorporated in the Ni-based nanosheet-like metasilicate was proven to trigger the regulated catalytic effect including positive and negative aspects towards styrene oxidation, and their function was identified and understood based on the reaction exploration results, in which the present cobalt significantly give rise to the promotive catalytic conversion activity and selectivity towards styreneoxide(conversion 96.8%, selectivity 78.4%), while the magnesium oppositely induced the restraining catalytic capacity(conversion 72%, selectivity 51.3%) on the Ni-based metasilicate compared with pure one. The obtained heterogeneous Ni-based metasilicate retain durable catalytic activity during five recycling for styrene oxidation and inherit the regulated catalytic performance in the substrate expansion.
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