TALANTA
·
2019
·
IF 4.916
Li Su,Xinai Yu,Yuqi Miao,Guojiang Mao,Wenpei Dong,Suling Feng,Siman Liu,Like Yang,Kaige Zhang,Hua Zhang
Nanozymes’ activities could be regulated by a simple and effective pH change in an in situ manner. In this work, for the first time, the peroxidase-like activity of Ni/Co layered double hydroxides (LDHs) was regulated via the alkaline-promoted reaction of fluorogenic substrate homovanillic acid and H 2 O 2 , and a promising tool for pH sensing was developed over the pH range of 8.3–9.6. As peroxidase nanozyme model, Ni/Co LDHs showed ease of preparation, low-cost, and water-solubility, which played an important role in this luminescence system. Based on the pH-dependent regulation of the Ni/Co LDHs activity, we constructed the bioassay platform for the determination urea, urease, penicillin G, and penicillinase with a wide linear range of 17–1000 µM, 3.3–270 mU mL −1 , 3.3–1300 µM and 3.3–100 mU mL −1 , respectively. This study not only demonstrated the alkaline-promoted modulation the nanozymes’ activities, but also established a facile approach to develop novel bioassays.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Heng Zhang,Muhammad Usman Tahir,Xiuling Yan,Xueming Liu,Xintai Su,Lijuan Zhang
Using sodium oleate as surfactant and intercalating agent, a regulated Ni-Al layered double hydroxide (NA-LDH-OA) nanosheets with a high interlayer space were prepared by two-phase method combined with a short reflux process and mild solvothermal reaction. In the process of electrochemical reaction, the electron transport is accelerated by the higher base spacing of the NA-LDH-OA ultrathin nanosheets. The as-prepared material exhibited a high specific capacity (1.040 C cm −2 at a current density of 1.68 mA cm −2 ) and good cycling performance (capacity retention of 88.25% after 2000 cycles) in a three-electrode system. Moreover, an aqueous asymmetric supercapacitor (ASC) was assembled using the synthesized NA-LDH-OA nanosheets as the positive electrode and activated carbon (AC) as the negative electrode. The aqueous ASC device (NA-LDH-OA-2//AC) achieved a high energy density of 40.26 Wh kg −1 at a power density of 943 W kg −1 , and a good cycling performance of 94.5% retention after 5000 cycles. These results demonstrated that the NA-LDH-OA nanosheets possess the potential for upcoming energy storage devices.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Le-Qing Fan,Fei Pan,Qiu-Mei Tu,Yun Gu,Jian-Ling Huang,Yun-Fang Huang,Ji-Huai Wu
Recently more and more concerns have been paid on ternary metal sulfides for use in supercapacitors because of their better electrochemical performances compared with binary counterparts. In this work, CuCo 2 S 4 nanosheet arrays on Ni foam were prepared by a sequential ion-exchange strategy under hydrothermal conditions, where Co 3 O 4 was converted into Co 4 S 3 by an anion-exchange reaction between Co 3 O 4 and S 2− ions, subsequently the Co 4 S 3 was transformed into CuCo 2 S 4 through a cation-exchange reaction with Cu 2+ ions. The as-prepared CuCo 2 S 4 was characterized by powder X-ray diffraction, high-resolution X-ray photoelectron spectroscopy, field emission scanning electron microscopy and transmission electron microscopy . The CuCo 2 S 4 arrays were composed of interconnected thin nanosheets with thickness of about 10 nm. The CuCo 2 S 4 nanosheet arrays on Ni foam were directly employed as a binder-free electrode showing a high specific capacitance of 3132.7 F g −1 at a current density of 1 A g −1 . Besides, an asymmetric supercapacitor based on this synthesized CuCo 2 S 4 electrode as positive electrode and active carbon as negative electrode can deliver a high energy density of 46.1 Wh kg −1 at a power density of 991.6 W kg −1 , and exhibits good rate capability and cycling stability.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Liming Yang,Zhenglin Chen,Dan Cui,Xubiao Luo,Bin Liang,Lixia Yang,Tian Liu,Aijie Wang,Shenglian Luo
Electrocatalytic hydrodechlorination is deemed as a promising environmental remediation technology for fast and effective detoxification of halogenated antibiotic pollutants. In this study, a novel nickel (Ni) foam electrode decorated by ultrafine palladium (Pd) nanoparticles (denoted as Pd@Ni-foam) was reported for electrocatalytic dechlorination of florfenicol (FLO, a typical antibiotic). The Pd@Ni-foam electrode was synthesized via a facile and simple spontaneous galvanic replacement of surface Ni atoms of Ni foam with Pd precursor. The obtained Pd@Ni-foam catalyst showed an excellent performance on electrochemical dechloridation of FLO. The dechloridation efficiency of FLO (20 mg L −1 ) reached 99.5% with the dechloridation rate as fast as 16.58 mg min −1 at cathode potential of –1.2 V ( vs . saturated Ag/AgCl), which far prevailed over pure Ni foam (2.63 mg min −1 ) and commercial Pd/C (11.32 mg min −1 ). The reaction rate constant (0.044 min −1 ) of FLO dechloridation at Pd@Ni-foam electrode was 44 and 4.4 times higher than that of pure Ni-foam (0.001 min −1 ) and commercial Pd/C (0.010 min −1 ), respectively. The excellent electrocatalysis for FLO dechloridation of Pd@Ni-foam cathode is ascribed to the 3D self-supported Ni-foam frame for mass transfer enhancement and the formation of Pd-Ni micro-interfaces leading to the high utilization of atomic H*. Furthermore, the toxicity assessment showed that the antibacterial activity of FLO was complete elimination after electrocatalytic dechlorination process.
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高影响因子
Sustainable Energy & Fuels
·
2019
·Vol. 4
·期 1
·164-170
·
IF 4.912
Shijian Luo,Xiaoman Li,Wanguo Gao,Haiqiang Zhang,Min Luo
Today, industrial ammonia synthesis mainly depends on the Haber–Bosch process, which causes a lot of energy consumption and huge CO2 emissions. The electrochemical N2 reduction reaction (NRR) is considered a more sustainable and environmentally benign alternative to produce ammonia, but it requires an efficient catalyst to overcome the difficulty of N2 activation. In this work, we reported that MOF-derived C@NiO@Ni microtubes behaved as a high-efficiency electrocatalyst in 0.1 M KOH electrolyte. This electrocatalyst achieved a high NH3 yield of 43.15 μg h−1 mgcat.−1 and faradaic efficiency of 10.9% at −0.7 V vs. a reversible hydrogen electrode. The experimental results indicated that the excellent NRR performance originated from the oxygen vacancies in NiO. Moreover, the abundant NiO/Ni interfaces were conducive to proton adsorption and further enhanced the NRR performance.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jie Zhu,Guolin Cao,Yunjiao Li,Shilei Wang,Shiyi Deng,Jia Guo,Yongxiang Chen,Tongxing Lei,Jinping Zhang,Shenghong Chang
The transition metals in ternary oxide cathode materials for lithium-ion batteries inevitably exchange with protons in LiPF 6 -containing electrolytes to be dissolved, leading to loss of the active material and rapid capacity fading. Here, a chemically inert Nd 2 O 3 interlayer is employed to avoid the direct contact of the active material (LiNi 0.8 Co 0.1 Mn 0.1 O 2 ) and electrolyte. As a result, Nd 2 O 3 -coated LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) shows improved cycle performances with a capacity retention of 88.0% after 100 cycles over 3.0–4.4 V, 9.3% higher than the retention of the bare NCM811. Even at an elevated temperature, Nd 2 O 3 -coated NCM811 exhibits better cycle performance as well. The superior electrochemical performances for Nd 2 O 3 -coated NCM811 are ascribed to that Nd 2 O 3 encapsulation-assisted surface passivation alleviates the undesirable interface side reactions and transition metal dissolution (TMD). These features suggest the promising potential of chemically inert Nd 2 O 3 as a long-acting surface modifier in passivating electrolyte/electrode interface.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2019
·
IF 4.914
Jingqing Tian,Haocheng Li,Xin Zeng,Zichun Wang,Jun Huang,Chen Zhao
ABSTRACT Development of dry reforming of methane and carbon dioxide is an effective route to convert in-dustrial waste gases such as coke-oven gas and coal-to-oil gas into platform syngas. However, this process encounters severe problems of metal particle sintering and coke formation at high tem-peratures. In this work, we developed a new synthetic method for preparing confined Ni/MCM-41 catalysts, which impede the sintering of metal nanoparticles (NPs) and coke deposition at high temperatures, enabling them to be successfully applied to methane dry reforming . The method results in high activity and stability of the catalyst at 700 °C for 200 h. The Ni precursor is immersed in ethanol and impregnated into MCM-41 by the peculiar capillary action of hexagonal straight mesopores . By this method, 10 wt% Ni NPs (d = 2 nm) is equably confined to the mesoporous channels with strong metal-support interactions, as confirmed by HRTEM, TEM mapping, H2-TPR, and XRD measurements. Such a confined structure has a significant effect on the inhibition of metal NP agglomeration and carbon deposition during methane dry reforming, as evidenced by TEM, Raman, TGA, and TPO measurements of used Ni/MCM-41 catalysts. In contrast, unconfined Ni/MCM-41 catalysts, with Ni NPs located on the pore exteriors, are rapidly deactivated after 12 h due to the blocked contact between the active metal centers and the gas feedstock. Additionally, a fast increase in the Ni NP size and the formation of substantial carbon nanotubes on the unconfined catalyst surface are seen. This work offers a facile approach for the synthesis of anti-sintering, car-bon-resistant confined Ni catalysts that can operate at high temperatures
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2019
·
IF 2.683
Zilong Zhang,Yangyang Lv,Xiqiao Chen,Zhuang Wu,Yaoyi He,Lei Zhang,Yanhong Zou
The porous flower-like Ni/C composites were simply prepared through the pyrolysis of Zn-doped metal organic frameworks (MOFs) under a N 2 atmosphere. The method is facile, controllable and without surface active agents. The microstructure, composition, and electromagnetic parameters can be easily controlled by varying thermal decomposition temperature to achieve the high electromagnetic loss. Interestingly, the Ni/C composites calcined at 800 °C have strong electromagnetic absorption with the maximum reflection loss (RL) value of −52.4 dB. In addition, the effective absorption band width (<−10 dB) of absorbing coating is as high as 5 GHz, and it is noteworthy that the composites have a very thin matching thickness of 1.6 mm. The excellent electromagnetic attenuation performance can be ascribed to the novel flower structures, synergistic effect between nickel and carbon, and remarkable impedance matching. This designed flower-like composites supply an impactful pathway to achieve potential candidate materials as highly effective microwave absorbers.
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 24
·7219-7229
·
IF 6.641
Xiaole Zhang,Dalei Song,Qi Liu,Rongrong Chen,Jindi Hou,Jingyuan Liu,Hongsen Zhang,Jing Yu,Peili Liu,Jun Wang
The reasonable design of semiconductor metal oxides modified by elemental doping and surface functionalization has been proven to be an effective method to improve the gas sensing abilities of chemiresistor-type sensors. In this work, Ni-doped In2O3 nanorods were fabricated via simple oil bath and annealing processes. To further enhance their gas sensing performances, Ag functionalization was carried out by a subsequent chemical reduction process. The experimental results reveal that these composites exhibit excellent formaldehyde sensing performance compared with pure In2O3 nanorods. In particular, 6%-Ag/Ni5.0In presents significantly enhanced gas sensing performance toward 100 ppm formaldehyde gas at a low working temperature (160 °C) with high sensitivity (123.97), fast response speed (1.45 s/58.2 s), and good selectivity and stability. Our research reveals that the improvement in sensing performance toward formaldehyde can be attributed to the large specific surface area, high relative contents of OV and OC components, electronic sensitization and the catalytic effect of Ag. The results provide an effective strategy to achieve excellent gas sensing performance for formaldehyde gas sensors.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Shuli Yin,Ziqiang Wang,Xiaoqian Qian,Dandan Yang,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
Tailoring the morphology and composition of Pt-based nanostructures is crucial to design high-performance electrocatalysts for direct methanol fuel cells. In this work, we propose a facile strategy to fabricate one-dimensional PtM (M = Co, Ni) mesoporous nanotubes (PtM MNTs), in which F127 and Te nanowires facilitate the formation of mesoporous exteriors and cannular interiors, respectively. Owing to the structural advantages of bimetallic mesoporous nanotube architectonics, the PtM MNTs exhibit superior electrochemical performance for the oxygen reduction reaction and methanol oxidation reaction. The proposed dual-template strategy is highly promising for designing active Pt-based mesoporous nanotubes with desired composition toward various electrocatalytic fields.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Dawei Zhang,Lijuan Jiang,Yiyi Liu,Lijun Qiu,Jinming Zhang,Dingsheng Yuan
In order to solve the problem of large overpotential in water electrolysis for hydrogen production , transition metal sulfides are promising bifunctional electrocatalysts for hydrogen evolution reaction/oxygen evolution reaction that can significantly reduce overpotential. In this work, Ni 3 S 2 and amorphous MoS x nanorods directly grown on Ni foam (Ni 3 S 2 -MoS x /NF) were prepared via one-step solvothermal process, which were used as a high-efficient electrocatalyst for overall water splitting. The Ni 3 S 2 -MoS x /NF composite exhibits very low overpotentials of 65 and 312 mV to reach 10 mA cm −2 and 50 mA cm −2 in 1.0 M KOH for HER and OER, respectively. Besides, it exhibits a low Tafel slope (81 mV dec −1 for HER, 103 mV dec −1 for OER), high exchange current density (1.51 mA cm −2 for HER, 0.26 mA cm −2 for OER), and remarkable long-term cycle stability. This work provides new perspective for further the development of highly effective non-noble-metal materials in the energy field.
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高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2019
·Vol. 66
·期 12
·1610-1618
·
IF 1.188
Tao Wang,Aiyun Hu,Haijun Wang,Yongmei Xia
Layered double hydroxides (LDHs) and their derivatives have been reported to be widely used as heterogeneous catalysts in various reactions. Herein, Ni-Fe LDHs with the controlled Ni/Fe molar ratios (2:1, 3:1, 4:1) were synthesized via an easy hydrothermal method, which were used to catalyze the selective reduction of biomass-derived furfural into furfuryl alcohol using 2-propanol as a H-donor under autogenous pressure and characterized using FT-IR, XRD, TGA, BET, SEM, NH 3 -TPD, and CO 2 -TPD. It was found that the LDH with a Ni/Fe molar ratio of 3:1 demonstrated the best catalytic activity among the LDHs with different Ni/Fe molar ratios, which showed 97.0% conversion of furfural and 90.2% yield of furfuryl alcohol at 140°C for 5 hr. This was attributable to the synergistic effect of acidic sites and basic sites of the catalyst.
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高影响因子
危险品化学品经营许可证（带存储）