CHEMICAL ENGINEERING & TECHNOLOGY
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2023
·Vol. 46
·期 5
·918-926
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IF 2.1
Guoqiang Li,Yunfei Zhang,Guojie Zhang,Yinghui Sun,Jiwei Liu
Different promoters have a significant impact on the catalyst performance. In this paper, the effects of different promoters on the physical properties and catalytic behavior of methane dry reforming catalysts were investigated. A series of characterizations showed that the Mg, Ba, and Ca promoters increased the basicity of the catalysts. However, their high concentration of OH − leads to the destruction of Ni 3 Si 2 O 5 (OH) 4 species, which results in a decrease of catalytic performance. The addition of Ce significantly improves the catalyst stability. After 100 h of Ni-5Ce-MSC reaction, there was almost no carbon deposition, exhibiting high activity and resistance to carbon accumulation. These findings provide a new perspective for the design of nickel-based dry reforming catalysts.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Shujuan Lv,Ying Deng,Qian Liu,Ziqi Fu,Xiaobin Liu,Minghui Wang,Zhenyu Xiao,Bin Li,Lei Wang
The hollow materials with open structure can accelerate the mass transfer and bubble release rate, which have attracted tremendous attention for electrocatalytic water splitting. In this work, a unique tri-metal phosphide open nanotube structure [FeCoNiP@carbon quantum dots, FCNP@CQDs] is firstly fabricated by a selected etching and phosphating process with a MIL-88A@CQDs (MIL stands for Material of Institute Lavoisier) as the precursor. Benefiting from their open structure, FCNP@CQDs exhibit excellent catalytic performance. In alkaline seawater solution, a low overpotential of 268 mV is required to reach 20 mA cm −2 current density for oxygen evolution reaction, while the η 20 of hydrogen evolution reaction is 150 mV. The FCNP@CQDs//FCNP@CQDs electrolyzer requires a voltage of 1.61 V to reach 10 mA cm −2 . The integrated strategy of CQDs-doping and construction of hollow open structures may open a new and relatively unexplored path for fabricating high-performance seawater splitting catalysis.
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Nanomaterials
·
2023
·Vol. 13
·期 1
·211
·
IF 5.3
Juanjuan Zhou,Wenying Zhou,Mengxue Yuan,Xinbo Dong,Jiebing Zhang,Xuejiao Zhang,Yanqing Zhang,Xiaolong Chen,Yanrong Chen,Xiangrong Liu
An insulating shell on the surface of conductive particles is vital for restraining the dielectric loss and leakage current of polymer composites. So as to inhibit the enormous loss and conductivity of pristine nickel (Ni)/poly(vinylidene fluoride)(PVDF) composites but still harvest a high dielectric permittivity (εr) when filler loading approaches or exceeds the percolation threshold (fc), pristine Ni particles were covered by a layer of titanium dioxide (TiO2) shell via a sol–gel approach, and then they were composited with PVDF. The impacts of the TiO2coating on the dielectric performances of the Ni/PVDF composites were explored as a function of the filler concentration, the shell thickness and frequency. In addition, the dielectric performances were fitted using the Havriliak–Negami (H–N) equation in order to further understand the TiO2shell’s effect on polarization mechanism in the composites. The Ni@TiO2/PVDF composites exhibit highεrand enhanced breakdown strength (Eb) but remarkably suppressed loss and conductivity when compared with pristine Ni/PVDF because the TiO2shell can efficiently stop the direct contact between Ni particles thereby suppressing the long–range electron transportation. Further, the dielectric performances can be effectively tuned through finely adjusting the TiO2shell’ thickness. The resulting Ni@TiO2/PVDF composites with highεrandEbbut low loss show appealing applications in microelectronics and electrical fields.Keywords:dielectric properties;metal;core–shell structure;polymer composites
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DIAMOND AND RELATED MATERIALS
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2022
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IF 3.806
Qi Qu,Huanhuan Wang,Qianpeng Dong,Yan He
In the current work, Ni-Co/CNTs networks were firstly produced by a simple annealing treatment of Ni Co PBA, which was then used as a carbon-based carrier and successfully deposited Fe 3 O 4 nanospheres via a classic hydrothermal reaction process. Additionally, the electromagnetic wave absorption performances of composites could be effectively affected by adjusting the mass ratio of the Fe 3 O 4 nanoparticles . The minimum reflection loss (RL min ) of −48.76 dB was achieved for Fe 3 O 4 @Ni-Co/CNTs-1# at 3.5 mm thickness. Meanwhile, Fe 3 O 4 @Ni-Co/CNTs-2# exhibited a wide effective absorption band (EAB) of 5.9 GHz (12.1–18 GHz) at a 2.0 mm matching thickness, suggesting that the Fe 3 O 4 @Ni-Co/CNTs composites were a promising absorber for electromagnetic wave absorption materials . Based on the synergistic effects of dielectric and magnetic losses generated by Ni-Co/CNTs and Fe 3 O 4 , respectively, and appropriately matched impedances, a new strategy for fabricating lightweight, thin-thickness, strong absorption, and wide-bandwidth materials was provided.
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FUEL PROCESSING TECHNOLOGY
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2023
·
IF 7.5
Yuanling Li,Han Yu,Jing Dai,Zhenzong Zhang,Zhichao Zhang,Hongbing Yu,Lina Liu
Non-thermal plasma (NTP) combined with catalysts supplies a potential alternative to enable the CH 4 and CO 2 conversion to work at low temperatures. In this study, different Ni/BN catalysts were synthesized using modified wetness impregnation for CH 4 and CO 2 conversion in dielectric barrier discharge (DBD) plasma. Among, BN_IPA_Ni exhibited the highest catalytic performance with a CH 4 conversion of 40.5%, a CO 2 conversion of 26.6%, a H 2 yield of 9.3% and a CO yield of 10.5%. The development of B O defects, which played a significant role in the size control of Ni particles to facilitate the dissociation of CH 4 to form H*, is the key for the high catalysis activity and selectivity in this reaction. In addition, the B O defects of BN_IPA_Ni provide an efficient route to eliminate excess CH x species, which further inhibit the nucleation growth of carbon species to inert carbon.
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Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Haopeng Jiang,Mengyang Xu,Xiaoxue Zhao,Huiqin Wang,Pengwei Huo
The electron density on the catalyst surface has a great influence on the multi-electron transport process of photocatalytic reduction of CO 2 . In this work, hierarchical Cu 2 O/Ni-MOF composite photocatalyst with local surface plasmon resonance (SPR) properties was prepared by simple hydrothermal and water bath methods. Through DRS, XPS and AES tests found that the SPR of Cu 0 expanded the light absorption , provided hot electrons for the reaction system, and greatly improved the photocatalytic activity in coordination with the hierarchical structure and heterostructure. In the absence of sacrificial agent, the CO yield of 30%-Cu 2 O/Ni-MOF was 4.1 times of Cu 2 O (5.32 μmol/g) and 11.1 times of Ni-MOF (1.95 μmol/g), respectively. Then, the possible photocatalytic reaction path was simply speculated based on in-situ FT-IR. In conclusion, the hierarchical structure, heterostructure and SPR effect accelerate the kinetics of Cu 2 O/Ni-MOF photocatalytic reaction, thus improving its photocatalytic activity.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jiasheng Wang,Ying Zhang,Xiaonan Xu,Ming Bao
Halogenated arylamines are important intermediates for the synthesis of dyes, pesticides, herbicides, and other chemicals. One important way to prepare halogenated arylamines is catalytic hydrogenation of halogenated nitroarenes. Ni-based catalysts have been used in the hydrogenation of halogenated nitroarenes but suffer from low activity and dehalogenation side reaction. In this paper, Ni–CeO2/SiO2 heterojunction catalyst with a “raisin-bun” structure was prepared by reverse microemulsion. A built-in electric field and more oxygen vacancies were formed due to electron transfer from Ni to CeO2 as a result of their work function difference. The built-in electric field leads to the heterolytic cleavage of H2, thereby improving the hydrogenation activity. Oxygen vacancies preferentially adsorb and activate nitro groups, inhibiting the dehalogenation side reaction. Through the cooperation of built-in electric field and oxygen vacancy, synchronous enhancement of the activity and selectivity is obtained successfully. This finding provides a new view for the design of non-noble metal-based catalysts with high activity and selectivity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Jinxiao Ba,Wei Cai,Yifan Chen,Li Lin,Yule Huang,Xianghai Yu,Yihua Wang,Chengqun Xu,Donghua Fan,Lisong Yin
In this work, pure and homogeneous Ni incorporated CdS photocatalyst was prepared by vulcanization of ZIF material synthesized from Cd/Ni salt by solvothermal method . The prepared pure CdS photocatalysts by the vulcanization of ZIF material exhibits better catalytic activity due to its larger specific surface area. The introduction of Ni can further improve the hydrogen production activity. The effect of Ni incorporating amount and annealing temperature on the hydrogen production activity of CdS photocatalyst was researched systematically. The photocatalytic activity at 10 % Ni incorporated CdS sample is greatly enhanced after annealing at 700 °C, which is attributed to the effective doping of Ni into the CdS lattice by annealing. The average hydrogen evolution rate is 1644.6 μmol/g/h, which adds up to about 119 times that of normal CdS. The current research provides a simple and effective method for improving the photocatalytic activity of CdS.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Shunfa Zhou,Guoli Zheng,Feng Ji,Jiatang Wang,Zhao Liu,Jiawei shi,Jing Li,Yang Hu,Chengwei Deng,Liyuan Fan,Weiwei Cai
Excellent porosity and accessibility are key requirements during carbon-based materials design for energy conversion applications. Herein, a Ni-based porous supramolecular framework with graphite-like morphology (Ni-SOF) was rationally designed as a carbon precursor. Ultrathin carbon nanosheets dispersed with Ni nanoparticles and Ni-N x sites (Ni@NiN x -N-C) were obtained via in-situ exfoliation during pyrolysis. Due to the hetero-porous structure succeeding from Ni-SOF, the Ni@NiN x -N-C catalyst showed outstanding bifunctional oxygen electrocatalytic activity with a narrow gap of 0.69 V between potential to deliver 10 mA cm −2 oxygen evolution and half-wave potential of oxygen reduction reaction, which even surpassed the Pt/C + IrO 2 pair. Therefore, the corresponding zinc-air battery exhibited excellent power output and stability. The multiple Ni-based active sites, the unique 2D structure with a high graphitization degree and large specific surface area synergistically contributed to the excellent bifunctional electrocatalytic activity of Ni@NiN x -N-C. This work provided a novel viewpoint for the development of carbon-based electrocatalyst.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yueling Yu,Jia Yang,Baogang Zhao,Xinfei Fan,Yuanlu Xu,Yanming Liu
Nonradical-based peroxymonosulfate (PMS) activation has recently caught increasing attention due to its less susceptible to environmental interference in the complex water matrix, but the performance of activators still requires further development for efficient pollutants degradation in wastewater treatment . Herein, a novel Co-Ni bimetal oxide loaded biochar was fabricated to boost nonradical PMS activation for enhancing sulfamethoxazole (SMX) degradation. According to the results, the as-obtained catalyst exhibited excellent SMX degradation efficiency of 96.2% within 30 min through complete nonradical oxidation pathway (including both 1 O 2 and mediated electron transfer). Co was confirmed to be the active sites to generate 1 O 2 dominated nonradical pathway. The biochar acted as the porous material to achieve the electron transfer oxidation process, as well as Ni ensured sufficient electron transfer rate and bound Co active sites to prevent the leaching of metal ions . Meanwhile, the prepared Co-Ni bimetal oxide loaded biochar possessed a remarkable catalytic degradation durability in the complex water environment conditions and showed universality for various organic contaminants . This study offers a valuable clue on the rational design of novel catalyst to induce the nonradical pathway-based persulfate activation .
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2023
·
IF 11.4
Ningyi Chen,Shuang Wu,Bingjun Pan,Zhichao Yang,Bingcai Pan
Advanced techniques for nickel (Ni(II)) removal from polluted waters have long been desired but challenged by the diversity of Ni(II) species (most in the form of complexes) which could not be readily discriminated by the traditional analytical protocols. Herein, a colorimetric sensor array is developed to address the above issue based on the shift of the UV–vis spectra of gold nanoparticles (Au NPs) after interaction with Ni(II) species. The sensor array is composed of three Au NP receptors modified by N-acetyl-l-cysteine (NAC), tributylhexadecylphosphonium bromide (THPB), and the mixture of 3-mercapto-1-propanesulfonic acid and adenosine monophosphate (MPS/AMP), to exhibit possible coordination, electrostatic attraction, and hydrophobic interaction toward different Ni(II) species. Twelve classical Ni(II) species were selected as targets to systematically demonstrate the applicability of the sensor array under various conditions. Multiple interactions with Ni(II) species were evidenced to trigger the diverse Au NP aggregation behaviors and subsequently produce a distinct colorimetric response toward each Ni(II) species. With the assistance of multivariate analysis, the Ni(II) species, either as the sole compound or as mixtures, can be unambiguously discriminated with high selectivity in simulated and real water samples. Moreover, the sensor array is very sensitive with the detection limit in the range of 4.2 to 10.5 μM for the target Ni(II) species. Principal component analysis signifies that coordination dominates the response of the sensor array toward different Ni(II) species. The accurate Ni(II) speciation provided by the sensor array is believed to assist the rational design of specific protocols for water decontamination and to shed new light on the development of convenient discrimination methods for other toxic metals of concern.
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APPLIED ENERGY
·
2023
·
IF 11.2
Xiangyu Yan,Buchu Lu,Hao Dong,Qibin Liu
Combining solar light and heat in dry reforming of methane (DRM) is a promising technology for reducing CO 2 to a valuable syngas and increasing the utilization of solar light in the solar-to-fuel process. The reaction temperature is still high and the mechanism remains unclear in DRM. Clarifying the synergistic mechanism of solar light and heat is pivotal for industrial applications. To this end, a nanoscale Ni/CeO 2 catalyst is prepared, and the synergistic effect of solar light and heat in DRM is experimentally investigated. The experimental results show that photo-thermochemistry leads to a 39.74% increase in relative conversion rate of CH 4 compared to thermochemistry, while the reaction temperature is reduced by 45 °C. The syngas production rate and the selectivity of DRM are improved by solar light. The in-situ infrared study indicates that solar light enhances the dissociation process of CH 4 and the production of HCOO ⁎ on the surface of the Ni/CeO 2 catalyst. The light response in the catalyst and microscopic enhancement of intermediate products are responsible for the increased DRM performance under photo-thermochemical conditions. These findings contribute to the understanding of the synergistic effects of solar light and heat, and guide the conversion of CO 2 into fuel with the aid of solar energy.
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