INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Zhihao Zhou,Soomro Sarmad,Chao Huang,Guoshu Deng,Zhenkun Sun,Lunbo Duan
Ni-based catalysts supported on ordered mesoporous Al 2 O 3 with 2-D hexagonal and 3-D cubic pore structures are synthesized via evaporation-induced self-assembly for catalyzing dry CH 4 reforming to produce syngas . The Ni–Al 2 O 3 catalysts with 3-D pore structure exhibit higher activity in terms of CH 4 and CO 2 conversions than those with 2-D pore symmetry, due to the better mass transfer of the 3-D interconnected pore structure for the accessibility of Ni 0 active sites. And a higher Ni content slightly promotes catalytic activity , owing to more exposed active sites. However, a higher Ni content causes more severe carbon deposition during long-term reaction. During the long-term stability tests, the catalysts with 2.5 wt% Ni maintain the highest stability regardless of the pore structure, and the catalyst with 3-D pore structure is more advantageous to both activity and stability. Meanwhile, the catalyst with 2.5 wt% Ni and 3-D pore structure shows the lowest carbon deposition.
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ChemSusChem
·
2023
·
IF 8.4
Xiuhong Li,Xun He,Jie Yao,Kai Dong,Long Hu,Jie Chen,Longcheng Zhang,Xiaoya Fan,Zhengwei Cai,Shengjun Sun,Dongdong Zheng,Mohamed S. Hamdy,Qian Liu,Yonglan Luo,Yunwen Liao,Xuping Sun
Graphical Electrochemical nitrite reduction to ammonia : Ni nanoparticles strutted 3D honeycomb-like porous carbon framework acts as a highly efficient catalyst for ammonia synthesis via electrochemical NO 2 − reduction, delivering a large NH 3 yield of 12.04 mg h −1 mg cat. −1 and a high Faradaic efficiency of 95.1 %. Electroreduction of nitrite (NO 2 − ) to ammonia (NH 3 ) provides a sustainable approach to yield NH 3 , whilst eliminating NO 2 − contaminants. In this study, Ni nanoparticles strutted 3D honeycomb-like porous carbon framework (Ni@HPCF) is fabricated as a high-efficiency electrocatalyst for selective reduction of NO 2 − to NH 3 . In 0.1 M NaOH with NO 2 − , such Ni@HPCF electrode obtains a significant NH 3 yield of 12.04 mg h −1 mg cat. −1 and a Faradaic efficiency of 95.1 %. Furthermore, it exhibits good long-term electrolysis stability.
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Sustainable Materials and Technologies
·
2023
·
IF 9.6
Chao Wang,Jingyi Zhang,Li Wang,Jianmin Feng,Liqun Wang,Lei Dong,Conglai Long,Dejun Li,Feng Hou,Ji Liang
The crucial step for splitting water is the oxygen evolution reaction . The key to promote this reaction lies in the catalyst. Molybdenum disulfide , as a two-dimensional material with molybdenum and sulfur atoms stacked, is especially suitable as a doping platform to develop high-performance OER catalysts. Fe/Co/Ni ternary transition metal combination has always been a highly active catalytic site for OER. Heteroelement of Fe/Co/Ni doping is expected to effectively modify the local electronic configuration of matrix materials and thus enhances their electrocatalytic OER capability. With this in mind, we report a simple in-situ hydrothermal doping of MoS x nanowires on iron‑nickel alloy foam with ternary transition metal of Fe/Co/Ni. This ternary transition metal of Fe/Co/Ni doped f self-supported electrode (denoted Fe/Co/Ni-MoS x /INF) displays outstanding OER performance in terms of small overpotentials of 214 and 263 mV at current densities of 10 and 100 mA/cm 2 , respectively, in alkaline solution. It was far better than the commercial Ir/C catalysts (253 and 434 mV@10 and 100 mA/cm 2 ). The Tafel slope is about 48.1 mV/dec. Moreover, Fe/Co/Ni-MoS x /INF also has an excellent catalytic stability without any obvious performance decay after 20 h operation. This work contributes to the investigation of high-efficiency OER catalysts based on transition metal-doped MoS x and offers a substitute for noble metal catalysts.
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SEPARATION SCIENCE AND TECHNOLOGY
·
2023
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IF 2.8
Mingjian Wang,Meiqing Zeng,Pingsan Wang,Yaochi Liu
The efficiency of Ni(II) removal from electroplating wastewater is highly correlated with different adsorption materials. A Ca-Si activated mineral adsorbent (CSAM) and two ion-exchange resins (732 and D152) were compared. The adsorption of Ni (II) by three materials is spontaneous and endothermic, and their adsorption capacities are similar (48.66–65.36 mg/g at 318K), but the dosage of CSAM is less (1.0 g/L for 50 mg/L Ni(II)), its adsorption is faster (<5 min) and pH range is wider (2–7). 10% NaCl, 1 mol/L HCl and 10% NaCl +1 mol/L HCl were used as desorbent agents, and CSAM exhibited an extremely low desorption rate (1.49–3.41%). The smaller separation factor (close to 0) and XPS analysis showed that the Ni(II) adsorption on CSAM was an irreversible chemical process, which was different from the three-stage adsorption of resins. The treatment of two kinds of electroplating wastewater with high and low concentration showed that CSAM not only had a higher Ni(II) removal rates (>98.4%), but also could efficiently remove Cu(II) (>98%), total-chromium (>79%) and COD (>66%). The treatment of Ni(II) containing electroplating wastewater with ion-exchange resins is greatly affected by the complexing agent. CSAM is more suitable for the treatment of electroplating wastewater containing various metals and organic matters.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Bai Jiang,Na Li,Yan Wang,Zuming Hu,Jing Zhu,Junrong Yu
In order to deal with the more complex electromagnetic radiation environment, there is highly desirable to manufacture a high-performance electromagnetic shielding material with excellent electromagnetic shielding efficiency, flexibility, thermal properties, fatigue resistance , and other qualities. In this paper, we fabricated an ultralight, flexible, and heat-resistant poly-m-phenylene isophthalamide (PMIA)/Ag nanowires(AgNWs)/Ni composite nanofiber film via electrospinning, spray coating, and electroless plating . Compared with different AgNWs spraying contents, the highest electromagnetic shielding effectiveness, about 96 dB with a thickness of ∼150 µm, is generated by spraying 33.333 mg/cm 2 AgNWs suspension. Additionally, because of the benefit of the PMIA, this PMIA/AgNW/Ni composite membrane maintains a constant EMI SE value (over 90 dB) after a high-temperature process under 200 °C, which only decreases by 3.33 %. The excellent performance of the material is due to its large porosity and sandwich structure, which can dissipate electromagnetic waves within the material, with only a very small portion of the electromagnetic waves passing through it. Therefore, this material has a potential application for use in diverse harsh settings.
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Flexible and Printed Electronics
·
2023
·Vol. 8
·期 2
·025021
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IF 3.1
Lipeng Huang,Xiaolian Chen,Xinzhou Wu,Zishou Hu,Shuhong Nie,Chenchao Huang,Shuo Zhang,Wenya Xu,Fangfang Pei,Wenming Su,Zheng Cui
Flexible electrochromic technology has gained numerous attentions in flexible smart wearable devices and flexible displays. For large-area flexible electrochromic devices (FECDs), highly conductive transparent electrodes with advanced stability at a prolonged redox cycling process are indispensable. In this work, a silver (Ag)/nickel (Ni) mesh/PH 1000 hybrid transparent film were successfully fabricated by selectively electrodepositing an 800 nm-thick dense metallic Ni layer and coating PH 1000 on an embedded Ag mesh to improve its electrochemical stability. The prepared hybrid transparent film presented high conductivity with a sheet resistance of below 1.5 Ω sq−1 at over 80% optical transmittance. The Ag/Ni mesh/PH 1000 was successfully utilized as current collectors for all-solid-state FECDs, showing fast coloration switching with a bleaching/coloring time of 0.7 s/0.9 s. In addition, the device demonstrated an exceptional electrochemical cycling stability, which could sustain 89% of its initial optical modulation after 25 000 cycles. More importantly, a remarkable mechanical durability was also achieved with a small optical modulation decay of 15% and an invariable response time after 1000 rolling cycles. In addition, uniform coloration were realized on a 6 × 6 cm2 FECD, demonstrating its great potential for applications of next-generation up-scaling FECDs.
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International Journal of Electrochemical Science
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2023
·
IF 1.5
Haiyan Wang,Yanan Chen,Wenfu Xie,Xiaoxue Han,Qian Feng,Rong Jiang,Hu Shang,Feifei Zhang,Linna Gao,Zonghua Wang
A novel Pt/Ni-Fe layered double hydroxide (Pt/Ni-Fe LDH) electrocatalyst was fabricated by a two-step facile process for oxidation of methanol in alkaline medium. It is found that Pt/Ni-Fe LDH electrocatalyst exhibits higher electrocatalytic activity, better anti-poisoning ability and stability for methanol oxidation comparing to pure Pt black and commercial Pt/C catalyst. Such an enhancement is probably attributed to the synergistic effect of Ni-Fe LDH and the uniform loading of Pt nanoparticles on the LDH layers. When ionic liquid (IL) was introduced to the composites, the prepared Pt/IL/Ni-Fe LDH exhibits even better electrocatalytic behaviors (205.6 mA mg -1 Pt, I f /I b=5.67) than the Pt/Ni-Fe LDH. Moreover, the morphology and structure of composites were characterized using scanning electron microscope equipped with an energy dispersive X-ray spectrometry, transmission electron microscope, X-ray diffraction, and FT-IR spectra. It is found that the Ni-Fe LDH have a flake-like morphology, the mean diameter of Pt nanoparticles in Pt/Ni-Fe LDH and Pt/IL/Ni-Fe LDH electrocatalyst is 4.36 nm and 3.09 nm, smaller than that in pure Pt black and commercial Pt/C electrocatalyst (8.70 nm and 6.48 nm).
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RSC Advances
·
2023
·Vol. 13
·期 13
·8901-8914
·
IF 3.9
Xinkuai He,Zhousi Hu,Qingtian Zou,Jingjing Yang,Ruqing Guo,Luye Wu
The preparation of active, stable and low-cost non-noble electrocatalysts for the hydrogen evolution reaction (HER) using the electrochemical water splitting process is crucial for the promotion of sustainable energy. In this study, Co–Ni alloys with various Co contents are prepared using a galvanostatic method and the co-deposition behavior of Co2+ and Ni2+ in ethylene glycol (EG) is reported. These results indicate that the presence of additional Ni2+ species can accelerate the Co–Ni co-deposition process and Co2+ species in the system can inhibit the reduction of Ni2+. Moreover, the two effects are improved with an increase in Ni2+ or Co2+ species concentration in the EG system, respectively. Chronoamperometry records show that the Co–Ni electro-crystallization mechanism is one of 3D instantaneous nucleation and growth. Moreover, the Co–Ni alloy with 59.46 wt% Co exhibits high electrocatalytic activity for HER with an overpotential of 133 mV at 10 mA cm−2 in 1 M KOH due to a high value of electrochemical active surface area (ECSA) (955.0 cm2). Therefore, the Co–Ni alloy electrocatalyst obtained from the EG system could be a promising candidate for practical hydrogen production.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Shiyu Zhang,Mengru Li,Jingwen Wang,Ruonan Zhang,Xiaoyu Ma,Haisheng Tao
Metal-organic frameworks with high porosity have received much attention in environmental pollutant treatment. This study presented a simple single-pot solvent thermal method for the preparation of a bimetal-organic framework MIL-53(Fe,Ni), further used for activated peroxydisulfate to degrade rhodamine B (RhB). The morphology and structure of the sample were characterized by scanning electron microscopy, transmission electron microscopy , x-ray diffraction, photoelectron spectroscopy , fourier transform infrared spectroscopy , and thermogravimetric analysis . The results showed that MIL-53(Fe,Ni) was successfully synthesized by the simple reaction, with high thermal stability and high specific surface area. The effects of pH value, co-existing ions, temperature, humic acid and different real water samples on RhB degradation were systematically investigated. Under optimized conditions, 93.9% of RhB was degraded within 180 min, together with excellent reusability. Quenching experiments and electron paramagnetic resonance showed that both free radicals (∙OH, SO 4 ∙- and O 2 ∙- ) and non-free radicals ( 1 O 2 and direct charge transfer) were responsible for the RhB degradation. In addition, the identification of intermediates by high-resolution mass spectrometer and reaction site prediction calculations (electrostatic potential, Fukui function and molecular orbit analysis), proposing a possible degradation pathway of RhB. The work highlights the broad applications of bimetal-organic frameworks in advanced oxidation processes .
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Qiang Gao,Yu Zhang,Shuai Zhang,Yan Ma,Xianzhe Sheng,Linhao Hui,Zhiwei Wang,Shuhuan Yun,Jianbin Qin,Guangcheng Zhang
To simultaneously enhance the processability, electrical conductivity and mechanical properties of composite foam for high-performance electromagnetic interference (EMI) shielding application, in this work, the epoxy (EP)/reduced graphene oxide (rGO)/Ni-chains microcellular composite foam is prepared through strategy of combining the hierarchical structured aerogel skeleton and supercritical carbon dioxide (scCO 2 ) foaming process. Benefiting from the construction of the rGO/Ni-chains bicontinuous conductive skeleton and introduction of microcellular structure, the EP/rGO/Ni-chains microcellular foam displays a “brick-and-mortar” structure and implements the multiple dissipation mechanism of electromagnetic (EM) wave to achieve outstanding EMI shielding efficiency (EMI SE) of 41.11 dB in X-band. Moreover, the selection of liquid epoxy as matrix avoids the use of large amounts of organic solvents, ensures the well processability of composite and realizes the excellent compressive strength (27.33 MPa) of the EP/rGO/Ni-chains microcellular foam with a density of 0.88 g/cm 3 , which shows great application value as a high-performance EMI shielding material.
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Small
·
2023
·Vol. 19
·期 26
·2206798
·
IF 13.3
Yaoxing Wang,Xueqin Fan,Qiuyu Du,Ying Shang,Xueqi Li,Zhifeng Cao,Xuan Wang,Jian Li,Yanjun Xie,Wentao Gan
The oxygen evolution reaction (OER) has significant effects on the water-splitting process and rechargeable metal-air batteries; however, the sluggish reaction kinetics caused by the four-electron transfer process for transition metal catalysts hinder large-scale commercialization in highly efficient electrochemical energy conversion devices. Herein, a magnetic heating-assisted enhancement design for low-cost carbonized wood with high OER activity is proposed, in which Ni nanoparticles are encapsulated in amorphous NiFe hydroxide nanosheets (a-NiFe@Ni-CW) via direct calcination and electroplating. The introduction of amorphous NiFe hydroxide nanosheets optimizes the electronic structure of a-NiFe@Ni-CW, accelerating electron transfer and reducing the energy barrier in the OER. More importantly, the Ni nanoparticles located on carbonized wood can function as magnetic heating centers under the effect of an alternating current (AC) magnetic field, further promoting the adsorption of reaction intermediates. Consequently, a-NiFe@Ni-CW demonstrated an overpotential of 268 mV at 100 mA cm −2 for the OER under an AC magnetic field, which is superior to that of most reported transition metal catalysts. Starting with sustainable and abundant wood, this work provides a reference for highly effective and low-cost electrocatalyst design with the assistance of a magnetic field.
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VACUUM
·
2023
·
IF 4
Jian Zhang,Chang Xu,Jing Li,Huanjun Lu,Shaohui Zhang,Chao Wang
In this paper, the Cu-/Ni-based one-dimensional (1D) conductive metal-organic frameworks (c-MOFs) nanorods (Cu 3 (HHTP) 2 /Ni 3 (HHTP) 2 ) have been synthesized successfully through a one-pot hydrothermal method . The effect of reaction time, MOFs compositions and ratio of solvent on the performance of Cu 3 (HHTP) 2 -/Ni 3 (HHTP) 2 - based resistive temperature sensors was studied by sensing platforms. Compared with Ni 3 (HHTP) 2 -based sensor, Cu 3 (HHTP) 2 -based sensor, which was assembled under DMF volume of 0.5 mL and reaction time of 12 h (Cu7), provided the optimal performance, for example, relative variation of resistance (RVR) near-linearly decreased by 85.9% from 20 °C to 80 °C, and the temperature coefficient of resistance (TCR) reached up −0.0157 °C -1 . Moreover, the resistance value of the Cu 3 (HHTP) 2 -based sensor is 0.106 kΩ, which exhibited a minimum resistance under different temperatures. These results demonstrate that the use of Ni 3 (HHTP) 2 -based 1D c-MOFs for fabrication of temperature sensor provides good conductivity and high thermo-responsive sensitivity. Hence, this study provided an excellent example for the simple preparation and practical application of 1D c-MOFs-based near-linear temperature sensor.
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