CHEMICAL ENGINEERING JOURNAL
·
2019
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IF 8.355
Xin Huang,Xujie Zhou,Shaohong Han,Jizhi Zhou,Guangren Qian,Naiyun Gao
Peroxydisulfate (PDS) activation has attracted much attention for the treatment of drinking water systems. In this work, Ni-doped MgAl layered double hydroxides (Ni-LDHs, Ni:Mg = 1:100 to 1:1, molar ratio) were prepared for the activation of PDS via intercalation. Compared with the case without Ni, doping with Ni resulted in much higher phenol degradation at the same PDS dosage. This was attributed to the activation of PDS, as the PDS consumption increased with increasing Ni doping amount. Moreover, radicals corresponding to organic decomposition were detected in the presence of Ni. Physical characterization results reveal that Ni(II) was converted to Ni(III) with PDS and then reduced back to Ni(II) during organic decomposition. To our best knowledge, this is the first study to report a cycle of Ni(II)-Ni(III)-Ni(II) in LDHs for the efficient activation of PDS. This effect was also observed in cases of odorous substances such as 4-bromophenol, 2-methylisoborneol, and geosmin. Our work provides a promising approach for the activation of PDS by Ni-LDHs.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Li-Zhi Huang,Junpeng Li,Weiguo Chen,Jia Deng,Fang Zhang
Ni organic complexes are widely used in industrial production, posing severe threats to the natural environment and human health. In this work, we found that Ni (0) formed by the decomplexation and reduction of typical Ni organic complexes (Ni-EDTA) on the surface of carbon felt cathode. The formed Ni(0) as a catalytic site generates atomic hydrogen (H•) with strong reductive reactivity via electron transfer. H• not only accelerates the oxygen activation to form H 2 O 2 on carbon felt cathode, but also reacts with H 2 O 2 to generate strong oxidative hydroxyl radicals (HO•) and singlet oxygen ( 1 O 2 ). Under the attack of multiple active species, 95.5 % of Ni-EDTA is removed, and the removal efficiencies of total organic carbon (TOC) and dissolved Ni reach 43.8 % and 77.1 % after 120 min of electrolysis at −2.0 V (vs. Ag/AgCl). The redox synergistic reaction, initiated by the formation of Ni(0) on the carbon felt cathode, demonstrates excellent stability in treating real Ni plating wastewater. This approach eliminates the need for additional chemical reagents and prevents the release of heavy metals. Our findings offer a novel strategy for leveraging the self-transformation of Ni organic complexes to generate various active species for electrochemical treatment of Ni plating wastewater.
研究领域:
环境科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2022
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IF 4.177
Yanjun Yu,Chen Chen,Yiheng Liu,Hongliang Yu,Shuaijie Li,Yanan Xue,Ning Cai,Jianzhi Wang,Faquan Yu
Developing efficient and cost-effective bifunctional catalytic electrodes is of great importance to water splitting. In this study, hybrid Ni/Ni(OH)2-coated NiCo2O4 nanorods were grown on Ni foam (NF) by a facile growth–conversion–epitaxy approach. The epitaxial decoration of Ni/Ni(OH)2 composite could increase the intrinsic activity of NiCo2O4/NF and enhance the charge-transfer rate. This self-standing hierarchical nanohybrid with unique surface chemistry and interface engineering exhibits an excellent electrocatalytic performance. The optimized Ni/Ni(OH)2-NiCo2O4/NF only requires overpotentials of 53 and 235 mV to reach a current density of 10 mA cm–2 for HER and OER, respectively. The electrolyzer achieved 10 mA cm–2 at a low cell voltage of 1.51 V for water splitting. This work offers a new perspective for rationally designing electrocatalytic materials by surface decoration.
研究领域:
材料科学
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电化学
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能源转换与存储
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 42
·10966-10972
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IF 5.236
Lanqing Li,Wei Gao,Min Lei,Dan Wen
Graphical A simple ex situ wet chemical transformation method of alkali treatment was proposed to prepare Ni(OH) 2 nanostructured flowers with large specific surface areas from Ni-MOF-74. The relationship between concentration of alkali and the structure properties of corresponding Ni(OH) 2 was uncovered. As the results, the catalyst of Ni(OH) 2 -0.25 performed remarkably catalytic properties with lower potential, higher current density and excellent durability towards MOR among various samples. Post treatment of metal-organic frameworks (MOFs) is widely employed to develop efficient electrocatalysts with better catalytic properties. But the complex processes of post treatment generally led to the collapse of the original structures of MOFs, making the preservation of their pristine hierarchical porous structure a great challenge. Herein, we propose the strategy of alkali treatment of Ni-MOF to transform it into Ni(OH) 2 with similar morphology and enhanced electrocatalytic properties for methanol oxidation reaction (MOR). The structure and electrocatalytic properties of as-obtained Ni(OH) 2 nanostructured flowers were seriously depended on the alkali concentrations. As the result, Ni(OH) 2 obtained from Ni-MOF treated by 0.25 M NaOH (noted as Ni(OH) 2 -0.25) performs 1.5 and 2.5 times larger current density than those of Ni(OH) 2 -0.025 and Ni(OH) 2 -0.5 for MOR. Moreover, the electrocatalytic process and mechanism of MOR on the catalyst of Ni(OH) 2 -0.25 are also revealed. Hence, this ex situ conversion strategy of alkali treatment for Ni-MOF uncovered the transformation of MOFs in alkaline solution and develops robust electrocatalyst for practical application of methanol fuel cells.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2015
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IF 6.217
Yu-Jie Zhong,Hong-Bin Dai,Yuan-Yuan Jiang,De-Min Chen,Min Zhu,Li-Xian Sun,Ping Wang
Hydrous hydrazine has received increasing attention as a promising hydrogen carrier owing to its many favorable attributes, such as high hydrogen content, low material cost, stable liquid state at ambient conditions, and free of solid decomposition byproduct. Herein, we report the synthesis of a supported core–shell structured Ni@Ni–Pt/La 2 O 3 catalyst by a combination of co-precipitation and galvanic replacement methods. The catalyst exhibits high catalytic activity and 100% selectivity towards hydrogen generation from hydrous hydrazine at mild conditions, which outperforms most reported hydrous hydrazine decomposition catalysts. The favorable catalytic performance of the Ni@Ni–Pt/La 2 O 3 catalyst is correlated with the Pt-induced electronic and geometric modifications on the catalyst surface .
研究领域:
催化
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材料科学
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能源
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Youwei Cheng,Lian Zhu,Yaqiong Gong
Metal-organic frameworks (MOFs) are widely recognized as precursors or sacrificial templates for the synthesis of target catalysts on account of their high porosity and high active surface area . Elemental doping strategy is considered as an effective method for the synthesis of efficient and stable catalysts for electrolytic water. Therefore, in this paper, Ce-doped Ni(OH) 2 nanoparticles and Ni-MOF nanosheets composites were synthesized by electrodeposition using Ni-MOF as precursor. Catalyst Ce–Ni(OH) 2 @Ni-MOF/NF displays excellent OER performance, requiring only 193 mV and 279 mV overpotentials to realize current densities of 10 mA cm −2 and 100 mA cm −2 , respectively, while the UOR performance was very remarkable, only a potential of 1.28 V was demanded to reach a current density of 10 mA cm −2 . In addition, no obvious change in the overpotential was noticed during the stability test of 16 h, indicating good stability of Ce–Ni(OH) 2 @Ni-MOF/NF. This study provides a meaningful reference for the design of an efficient and stable environmental friendly electrocatalyst .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 12
·8293-8302
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IF 3.9
Yanchun Tong,Chunmiao Liu,Chang Liu,Haibin Sun,Yurun Feng,Qiangqiang Hu,Hongying Zhang,Yujun Zhao,Xue Guo,Shigang Wu
In this paper, the SiCN(Ni)/BN ceramic with excellent electromagnetic wave (EMW) absorption performance was successfully prepared. The Ni and Ni3Si were in situ formed by the introduction of nickel acetylacetonate (NA), which effectively improved the impedance matching performance of SiCN(Ni)/BN ceramics. The EMW absorption properties of the SiCN(Ni)/BN ceramics showed a trend of first increasing and then decreasing with the increase in content of NA. When the NA content reached 7 wt%, the impedance matching range of SiCN-7 was optimal. The minimum reflection loss (RLmin) of SiCN-7 reached −53.47 dB at 4.2 mm and the effective absorption bandwidth (EAB) was 2.32 GHz at 3.48 mm. Through the analysis of electrical conductivity, it was found that the proportion of polarization loss in dielectric loss was more than 99%. It is worth noting that the radar cross section (RCS) value of SiCN-7 absorber was lower than that of the perfect electrical conductor (PEC) plate in the range of −90–90°, and showed a larger coverage angle, indicating that it possessed a good practical application prospect in the field of electromagnetic wave absorption.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Weijun Liang,Senlin Wang,Yanxiu Zhang,Jian Gu,Kaida Zhu,Jing Zhong,Xinru Wang
β-Ni(OH) 2 with good crystallinity is grown on the surface of the flower-like α-Ni(OH) 2 to form a 3D α@β-Ni(OH) 2 material by a two-step hydrothermal method . The synthesized β-Ni(OH) 2 is nanometer size and strong alkali stability, while the α-Ni(OH) 2 has a large specific surface, high specific capacity and good electrical conductivity , so there are multiple synergistic effects between the β-Ni(OH) 2 coating and the α-Ni(OH) 2 core. Coupled with a 3D flower-like structure, the obtained α@β-Ni(OH) 2 electrode shows a high capacity of 431 mAh g −1 at a current density of 1 A g −1 . Furthermore, we use the α@β-Ni(OH) 2 electrode and the activated carbon (AC) electrode to assemble an asymmetric supercapacitor (ASC) device. This ASC shows the excellent energy density of 53 Wh kg −1 at a power density of 875 W kg −1 and capacity retention rate of 78% after 5000 cycles. Finally, metal hydride (MH) is used to replace the AC negative electrode, and a cell with a high energy density of 100.17 Wh kg −1 at a power density of 424.75 W kg −1 is obtained. The results show that α@β-Ni(OH) 2 electrode has better electrochemical performance than commercial electrodes and has application prospects in energy storage.
研究领域:
材料科学
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能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
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IF 6.7
Zekun Guan,Guangxun Sun,Chao Feng,Junxi Li,Minmin Wang,Mengdi Guo,Bin Liu,Yuan Pan,Chenguang Liu,Yongming Chai,Yunqi Liu
The production of cleaner gasoline requires reducing sulfur and olefin content in fluid catalytic cracking (FCC) gasoline. Herein, Ni/ZSM-5@Ni/ZnO catalysts were synthesized by uniformly coating Ni/ZnO on the surface of Ni/ZSM-5 by electrostatic induced crystallization strategy for FCC gasoline desulfurization-aromatization tandem reactions. The desulfurization activity of Ni/ZSM-5@Ni/ZnO has superior desulfurization activity due to the smaller size of ZnO, higher O vacancy content, and more uniform dispersion of Ni and ZnO relative to the physically mixed Ni/ZSM-5-Ni/ZnO. In addition, coating Ni/ZnO on the surface of Ni/ZSM-5 can reduce the Brønsted acid content of Ni/ZSM-5, increase the Lewis/Brønsted acid value of the catalyst, which inhibits the excessive cracking of FCC gasoline, and improves the liquid yield and aromatics selectivity. After 8 h of reaction, the desulfurization rate, aromatics generation rate and olefin conversion rate of Ni/ZSM-5@Ni/ZnO were 85.58 %, 25.22 % and 49.08 % respectively, which were higher than those of physically mixed Ni/ZSM-5-Ni/ZnO catalysts by 25.34 %, 15.95, and 12.98 %, respectively. Meanwhile, the unique structure of Ni/ZSM-5@Ni/ZnO reduces carbon deposition and delays catalyst deactivation. Density functional theory calculations show that Ni/ZSM-5@Ni/ZnO was more favorable for thiophene desulfurization and has a better ability to adsorb and activate H 2 . This study provides a new idea for the development of catalysts for clean gasoline production.
研究领域:
催化化学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Fang Wu,Yuhong Jiao,Jinlong Ge,Yujun Zhu,chao feng,Zhong Wu,Chang-Peng Lv
Exploring highly active, low-cost electrocatalysts for oxygen evolution reaction (OER) is of great significance but still a major challenge. Here, we synthesized Ni(OH)2@Ni(Fe)OOH with a sea urchin structure on nickel foam via a simple hydrothermal and subsequent soaking process. Experimental results indicate that incorporation of Fe into Ni(OH)2 is favorable for modulate the electronic structure, faster electron transfer and improved intrinsic activity, thereby leading to excellent OER activity. The optimized Ni(OH)2@Ni(Fe)OOH exhibits superior OER activity with overpotentials of 245 and 310 mV at 10 and 100 mA cm-2, respectively, and a small Tafel slope of 40.7 mV dec-1, and along with high stability over 100 h, which is more active than benchmark RuO2 and sever control samples without introduction of Fe. More importantly, the overall water splitting system by using Ni(OH)2@Ni(Fe)OOH-100 as anode and Pt/C as the cathode only requires a cell voltage of 1.54 V to afford 10 mA cm-2. This work not only demonstrate the key factor of Fe doping, but also offers a new path for the development of NiFe-based OER catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
Tingting Xu,Xudong Hou,Shengjun Liu,Bo Liu
We demonstrated a facile and efficient method for the preparation of a magnetic and porous Ni@MOF-74(Ni) [Ni 2 (DOBDC), DOBDC = 2, 5-dihydroxyterephthalate] composite by one-step solvothermal reaction of Raney Ni and DOBDC. Ni in the reaction not only acted as the core of the composite, but also provided metal source for the formation of MOF-74(Ni). The Ni@MOF-74(Ni) composite exhibits both magnetic characteristics and high porosity, enabling it an efficient candidate for dye removal and target drug delivery system. The adsorption amount of rhodamine b reached up to 177.8 mg g −1 , and 4.1 mg g −1 for ibuprofen.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2020
·
IF 3.687
Haijun Pan,Yuanyuan Peng,Xinhuan Lu,Jie He,Lin He,Chenlong Wang,Fanfan Yue,Haifu Zhang,Dan Zhou,Qinghua Xia
1,3,5-benzenetricarboxylate (BTC) and 4,4′-bipyridine (BIPY) are employed in the synthesis of dual ligands Ni-MOFs. The magnetic Ni@CN nanocatalyst is prepared by direct pyrolysis of Ni-MOFs in N 2 atmosphere, which exhibited excellent activity in selective hydrogenation of nitrobenzene (NB) to aniline (AN) at 60 °C, 2.0 MPa H 2 . The conversion of NB can reach 99.1 mol%, and the selectivity of AN is over 99 %. A series of characterizations are obtained by XRD, Raman, XPS, SEM, TEM, TPR and TGA. It is found that the synergic effect of Ni species and N contributes to the increase of catalytic activity of the catalyst. Cycling tests proved that the prepared catalyst could be reused ten times without a visible reduction in catalytic activity of hydrogenation. The excellent stability and activity of Ni@CN nanocatalyst could be assigned to the porosity of carbon material doped with nitrogen, derived from dual ligands Ni-MOFs.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）