JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xin Wang,Yiyang Bi,Chengqian Wang,Ke Li,Yu Zhang,Qun Liu
In this research, we report a simple and cost-effective method for the preparation of two-dimensional (2D) Ni 2 P-Ni(PO 3 ) 2 derived from metal-organic frameworks (MOFs) via a one-step thermal phosphorization strategy. The resulting material is employed to significantly enhance the photocatalytic hydrogen evolution performance of zero-dimensional (0D) CdS nanoparticles. Through an ultrasonic-assisted strategy, the CdS nanoparticles are uniformly dispersed on the surface of Ni 2 P-Ni(PO 3 ) 2 , leading to the successful fabrication of a Ni 2 P-Ni(PO 3 ) 2 /CdS composite with substantially enhanced photocatalytic performance. Under visible light irradiation (λ ≥ 420 nm) using Na 2 S-Na 2 SO 3 as sacrificial agents, the 3 wt% Ni 2 P-Ni(PO 3 ) 2 /CdS composite demonstrated a remarkable photocatalytic hydrogen evolution rate of 2235 µmol g −1 h −1 , which is approximately 7.5 times higher than that of pristine CdS (297 µmol g −1 h −1 ). Over a 20 h cycling experiment, the composite catalyst demonstrated remarkable stability, maintaining around 78 % of its initial hydrogen generation efficiency. The enhanced performance of the composite is ascribed to the role of Ni 2 P-Ni(PO 3 ) 2 in facilitating the separation of photoinduced charge carriers from CdS and improving electrical conductivity. A possible electron-hole transfer mechanism is proposed based on the experimental findings. This work is expected to be helpful in fabricating efficient CdS photocatalysts.
研究领域:
材料科学
·
纳米技术
·
催化
·
能量转换
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Shuang Wu,Zheni Wang,Lei Wan,Chenghui Luo,Shams Ali Baig,Xinhua Xu
In the present study, Pd/Ni foam electrode was prepared by improved impregnation method for electrocatalytic hydrodechlorination (ECH) of clofibric acid (CA). The effects of complexing agent addition into the impregnation solution for the formation of Ni(OH) 2 and the ECH activity of Pd/Ni foam electrode were investigated. Results revealed that the introduction of sodium acetate (the complexing agent) greatly enhanced the ECH activity as compared to common impregnation liquid. Characterizations analyses demonstrated that the addition of sodium acetate did not change the phase of the electrode’s surface, but effectively reduced the deposition of Ni(OH) 2 . The surface morphology of the electrode was changed simultaneously by the addition of sodium acetate and the interlacing structure of Ni(OH) 2 and Pd catalyst was formed. NaAc before -Pd/Ni and NaAc after -Pd/Ni foam electrodes were used to perform ECH experiments on CA, and the combined Pd/Ni foam 15 min electrode was compared with the Pd/Ni foam 6 h electrode. After 2 h of electrolysis, the NaAc after -Pd/Ni foam electrode was found to remove the CA (∼100%) in the solution, which was 1.3 times the removal rate of the Pd/Ni foam 6 h electrode to CA and exceeded the Pd/Ni foam 15 min electrode. Findings from the present study demonstrated that adding the complexing agent into the impregnation solution can improve the ECH activity of Pd/Ni foam electrode and achieve a faster and more efficient dechlorination effect of CA.
研究领域:
环境化学
·
电化学
·
催化
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Yutong Pan,Pengju Gao,Shixiong Tang,Xiaoyu Han,Ziwen Hao,Jiyi Chen,Zhenmei Zhang,Heng Zhang,Xiaohui Zi,Maoshuai Li,Shiwei Wang,Yue Wang,Xinbin Ma
This work synthesized a series of Ni/CeO 2 /Al 2 O 3 catalysts with varying CeO 2 doping amounts to enhance low-temperature CO 2 methanation. The introduction of CeO 2 weakens the interaction between Ni and Al 2 O 3 , leading to the formation of Ni-CeO 2 active sites. This results in a high dispersion of Ni and CeO 2 , improved catalyst reducibility, increased number of active sites, and enhanced the CO 2 methanation. This work further investigated the impact of WHSV and catalyst stacking configuration to enhance the reaction. When the catalyst is stacked into three segments with a temperature gradient of 330 °C, 300 °C, and 250 °C under WHSV=9000 ml·h –1 ·(g cat) –1 , the CO 2 conversion significantly increases to 95%, which is remarkably close to the thermodynamic equilibrium (96%).
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yongqian Shen,Fan Zhang,Yuchen Zhang,Minmin Dang,Bin Li,Jiqiang Ma,Xueyan Du
Multifunctional microwave absorbers with robust hydrophobicity and enhanced wave absorption are of great significance for human health and the martial applications. Herein, carbon nanofibers (CNFs) inlaid with Ni/NiO and SiO 2 nanoparticles were prepared by electrospinning and in-situ annealing method. Contrast experiments at different annealing temperatures had been conducted to illustrate the formation process and microwave loss mechanism of Ni/NiO/SiO 2 /CNFs. At the annealing temperature of 550 °C, the optimal reflection loss (RL) of −40.1 dB was reached at 16.6 GHz with a thickness of 2.5 mm, the effective absorption bandwidth (EAB) was 5.2 GHz. The maximum EAB of 8.0 GHz was obtained as the thickness close to 3.0 mm, covering the half of X band and entire Ku band. It was worth mentioning that the introduction of nano SiO 2 into the Ni/NiO/CNFs annealed at 550 °C could refine the nanoparticles of Ni, promote the formation of Ni, improve the complex permittivity, and ultimately widen the EAB. Moreover, the contact angle (CA) of the Ni/NiO/SiO 2 /CNFs membranes annealed at 450, 550, 650 and 750 °C was 154.3°, 138.7°, 142.2° and 144.9°, respectively, illustrating that the products were of robust hydrophobicity. Therefore, the as-prepared NFs are promising in multifunction wave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Chunmiao Liu,Yanchun Tong,Chang Liu,Meng Xu,Haibin Sun,Shigang Wu,Yujun Zhao,Jiao Li,Xue Guo,Yurun Feng
Faced with severe electromagnetic wave (EMW) pollution, the development of high-performance EMW absorbers remains a formidable challenge. In this study, SiBCN/Ni fibers containing uniformly dispersed Ni 2 Si nanoparticles were synthesized by electrospinning method with polymer-derived ceramics method, and their electromagnetic properties were evaluated. The low permeability threshold of the fibers ensures sufficient conduction loss effect. The in situ grown Ni 2 Si nanoparticles provide a magnetically coupled network, which is more conducive to obtaining excellent impedance matching. Furthermore, the presence of β-SiC, SiO 2 , and Si 2 N 2 O generates numerous heterogeneous interfaces (e.g., C-SiC and C-Ni 2 Si), leading to enhanced interfacial polarization through the accumulation of charges. As a result, the prepared SiBCN/Ni fibers exhibit impressive EMW absorption properties . At a Ni content of 1 wt%, the effective absorption band (EAB) is 4.32 GHz (13.68–18 GHz). At a Ni content of 1.5 wt%, the minimum reflection loss (RL min ) is −52.98 dB, and the sample has excellent radar scattering capabilities, which is verified by CST Microwave Studio simulations. Therefore, SiBCN/Ni fibers are promising as excellent EMW absorbing materials in practical applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2024
·
IF 3.6
Xueli Zhang,Shan Hu,Fangyuan Zhang,Shuchen Xing,Huilin Hu,Jinhua Ye,Defa Wang
As a promising technology to mitigate global carbon emissions, photothermal catalytic CO 2 reduction remains a great challenge in increasing the conversion efficiency and regulating the product selectivity. Herein, a series of phase-separated Ni–Mo alloy catalysts for efficient photothermal CO 2 reduction with tunable CO selectivity is reported. With the increase of Mo content, the evolution rate and selectivity of CO increases. The optimal catalyst Ni 1 Mo 1 achieves 32.1% CO 2 conversion with 98.0% of CO selectivity and 71.1 mmol g cat −1 h −1 of CO evolution rate under a 300 W xenon lamp irradiation. Further increasing the Mo content reduces the CO evolution rate while maintaining the high CO selectivity. In the mechanistic study, it is revealed that the Ni–Mo alloy with an appropriate Ni/Mo ratio (e.g., Ni 1 Mo 1 ) possesses a modified electronic structure with more negative d-band center, which increases the light absorption, reduces the H 2 dissociation, and favors the CO desorption, thereby leading to efficient and selective photothermal reduction of CO 2 to CO. In this work, a viable strategy to design nickel-based catalysts is provided for efficient and selective photothermal CO 2 reduction via composition-mediated modification of electronic structure.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Caihong Wang,Weiliang Qi,Ying Zhou,Wandi Kuang,Tamil Azhagan,Tiju Thomas,Chunjie Jiang,Siqi Liu,Minghui Yang
Efficient semiconductor-cocatalyst junctions are of direct relevance to solar energy based fuel generation. Here, Ni-Mo ternary nitrides based one-dimensional hierarchical structures (In 2 S 3 -Ni 0.2 Mo 0.8 N(Ni)) have been successfully prepared and used to achieve visible light driven H 2 evolution. Because of the metallic-like properties of the transition metal nitrides, Ni 0.2 Mo 0.8 N(Ni) as co-catalysts can promote photo-generated charge-carriers transportation/separation and decrease the overpotential of H 2 -evolution. Thus, the photocatalytic property of optimal 1 wt% In 2 S 3 -Ni 0.2 Mo 0.8 N(Ni) exhibits a hydrogen evolution rate of 614.2 μmol g -1 h −1 , which is about 10 times as high as that of blank In 2 S 3 (61.4 μmol g −1 h −1 ). Besides, the pure Ni 0.2 Mo 0.8 N shows higher co-catalytic properties than Ni 0.2 Mo 0.8 N(Ni). This indicates that the metallic Ni (and related species) lowers the co-catalytic role of ternary nitrides. Another robust indication of this is the fact that In 2 S 3 -Ni 0.2 Mo 0.8 N nanohybrid displays about 2 times higher H 2 evolution rate than In 2 S 3 -Ni 0.2 Mo 0.8 N(Ni).
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 7
·3829-3838
·
IF 2.3
Wang Mingyue,Li Ting,Tian Yuhao,Zhang Jiarong,Cai Weijie
To develop high-performance catalysts for greenhouse gas CO 2 reforming with ethanol (EDR) is progressively inspired by the urgent requirement of CO 2 elimination in order to meet with the sustainable development. In this work, the bimetallic Co(Ni)/ZnO catalyst derived from MOFs was investigated in detail with a focus on the effect of Ni dopant. The EDR results indicated that the bimetallic Co(Ni)/ZnO catalyst presented better activity as well as less formation of byproducts in comparison with the monometallic Co/ZnO catalyst. 100% of ethanol conversion was obtained at 500 °C for Co(Ni)/ZnO versus 650 °C for Co/ZnO. Moreover, no acetone formation was observed over Co(Ni)/ZnO catalyst while the concentration of acetone in Co/ZnO was as high as 10 mol%. Characterization results depicted that the strong synergistic effect between Ni and Co in Co(Ni)/ZnO catalyst might greatly stabilize active metal cobalt with smaller particle size, improve the reducibility and facilitate the generation of oxygen defects, thereby enhancing the catalytic performance. To a certain extent, this work might contribute to the design of efficient catalysts for other catalytic applications. Graphical
研究领域:
催化
·
环境化学
·
材料科学
·
绿色化学
·
能量转换
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Mengyang Xu,Chao Sun,Xiaoxue Zhao,Haopeng Jiang,Huiqin Wang,Pengwei Huo
Fabricating the hierarchical heterostructure is efficient way for enhancing CO 2 conversion of semiconductor photocatalysts. Herein, a simple strategy has been employed to prepare several 3D hierarchical CdS/Ni-MOF heterostructure photocatalysts, and the selective photoreduction of CO 2 to CO under simulated sunlight in the gas–solid phase reactor. Among the prepared photocatalysts, 20%-CdS/Ni-MOF shows the best CO yield, which was 16 times and 7 times that of Ni-MOF and CdS, respectively. By controlling the morphology of the catalyst, we found that the significant improvement in photocatalytic activity can be ascribed to the synergistic effect of heterostructure in CdS/Ni-MOF and its unique hierarchical structure, which can improve the efficiency of charge transmission and provides abundant active sites, etc. Finally, the preliminary photocatalytic mechanism was discussed by in situ FTIR and liquid ultraviolet spectrophotometer.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 8
·4088-4095
·
IF 2.3
Li Ling,Yan Shasha,Wang Hui,Ge Xingbo
The oxygen evolution reaction (OER) plays a vital role in electrolytic water splitting. It is urgent to explore highly active non-precious metal OER catalysts. Herein, the etching combined with the electrodeposition was used to synthesize the efficient Ni–Fe/p-CoAl catalyst, which exhibits ideal OER performance. A low overpotential of 282 mV and 296 mV are needed to achieve the current density of 50 mA/cm 2 and 100 mA/cm 2 in 1 M KOH, respectively. Moreover, the as-prepared catalyst shows good durability with no detectable degradation during long-term operation. The enhanced OER performance can be attributed to the large electrochemical surface area and the strong interaction between Ni–Fe nanosheets and active substrate. Graphical Abstract Etching combined with the electrodeposition method was used to synthesize an efficient Ni–Fe/p-CoAl catalyst for OER.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Hui Wang,Yawen Yang,Zeyang Li,Xiaohao Kong,Philip Martin,Guoqing Cui,Ruixue Wang
Dry reforming of methane (DRM) reaction can convert primary greenhouse gases (CH 4 and CO 2 ) to value-added chemicals (H 2 and CO), but generally suffers from harsh reaction conditions (>700 °C) and inevitable deactivation of catalysts. In this work, we report supported Ni catalysts based on a topotactic transformation process from the layered double hydroxides (NiZnAl−LDHs) precursors. Structural characterizations (XRD, HRTEM , CO chemisorption) verify a uniform distribution of Ni nanoparticles (∼7 nm) on the mixed metal oxides support with a high dispersion (denoted as Ni/MMO). With the assistance of non-thermal plasma (NTP), the optimal sample (Ni/MMO−S2) exhibits a good catalytic conversion of CH 4 (∼69%) and CO 2 (∼54%) at low temperatures (30–60 °C), which is comparable with the activity of thermocatalytic process at ∼650 °C without NTP. The energy efficiency of NTP-assisted catalysis process is an order of magnitude higher than that of thermocatalytic process at ∼650 °C and enhances by 80% relative to NTP-alone process at low temperatures. The Ni/MMO−S2 catalyst shows satisfactory stability after 600 min stability test, with a slight decrease in conversion (within ∼1%). In addition, a combined study including catalytic evaluations, operando OES, XAFS and XPS verifies that metallic Ni species acts as active center, which can promote the dissociation of CH 4 and CO 2 into highly reactive intermediate species with the assistance of NTP. This synergistic effect between plasma and Ni catalyst remarkably decreases the apparent activation energy by ∼50%, accounting for the high catalytic performance at low temperatures. This work demonstrates a promising synergistic catalysis strategy between plasma and catalysts at low temperatures, which can be extended to other reactions operated under harsh conditions.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2020
·
IF 6.289
Yuxin Wang,Linlin Guan,Zhen He,Shengping Zhang,Harshpreet Singh,Muhammad Dilawer Hayat,Caizhen Yao
Aluminum often requires protective coatings to prevent corrosion. The aluminum alloy substrate usually needs pretreatment to minimize, stabilize or convert the surface oxide in order to achieve adequate coating adhesion. The electrodeposited Ni-P coating is a promising candidate as a protective coating due to its easy fabrication and excellent performance. This study comprehensively investigates the pretreatment of zincating and anodizing on 6061 aluminum alloy, and systematically discusses their influence on the electrodeposited Ni-P coatings. The crystal structure and elemental composition were investigated for interlayers and Ni-P coatings subsequently, while morphologies of the coating surface and cross-section were also determined. The results revealed similar phase composition for differently pretreated Ni-P coatings, while distinct nodule featured morphology was observed for anodized Ni-P coating. It was found that anodized Ni-P coatings had the best performance due to its superior coating adhesion, wear-resistance, and corrosion resistance. In contrast, severe wear damage was occurred to zincated Ni-P coatings due to its inferior microstructure and weak zinc interlayer. Lastly, the influence of anodizing pretreatment on the coating microstructure is discussed, and a model is proposed for Ni-P electrodeposition employing anodizing pretreatment.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
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