FUEL
·
2019
·
IF 5.128
Xiaodong Li,Yanli Huang,Qian Zhang,Zhijun Zuo,Xiaodong Wang,Vladimir A. Vinokurov,Zheng Wang,Wei Huang
Ni-MoCeZr-MgAl(O) mixed oxide catalysts were successfully prepared from the Ce, Zr and Mo promoted hydrotalcite-like compounds (HTLcs) precursors using the simple and effective hexamethylenetetramine(HMT)-assisted hydrothermal synthesis method by tuning the molar ratio of n(HMT)/n(NO 3 − ). The influence of Ni content (3, 4.8, 6, 9 and 12%) on the catalytic performance of these catalysts in dry reforming of methane (DRM) was focused. Adjusting the content of Ni was able to change the metal dispersion and metal particle size, and small-sized (around 7 nm) and evenly dispersed Ni particles were obtained at Ni content of 6%. The catalyst with 6% Ni loading stood out for the high activity and stability, the CH 4 conversion of which fluctuated around 95% continuously for 610 h under GHSV of 60,000 mL·g cat −1 ·h −1 , and it was still above 92.8% throughout the 36-h-duration DRM experiments under GHSV of 80,000 mL·g cat −1 ·h −1 . This research may provide a simple and effective methodology for the synthesis of stable and efficient DRM catalysts.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qing-Qing Pang,Xi-Zheng Fan,Sha-Sha Yi,Xin Du,Zhong-Yi Liu,Xin-Zheng Yue
The design of bifunctional catalysts with spatially separated active sites holds significance importance in achieving simultaneous electrooxidation and hydrogen evolution reaction (HER). Herein, a core-shell Re-Ni@Ni(OH) 2 /CC heterostructure is demonstrated for the electrocatalytic furfural oxidation reaction (FOR) coupled with HER. Experimental results and theoretical analyses reveal that Re not only modulates the heterointerface between Re-Ni core and Ni(OH) 2 shell, facilitating furfural (FF) adsorption at Ni(OH) 2 sites, but also regulates electronic structure of Ni. This leads to a negative shift in the d-band center from Fermi level, effectively weakening hydrogen adsorption at Ni sites in Re-Ni@Ni(OH) 2 heterostructure, thereby improving the HER process. As a result, the synthesized Re-Ni@Ni(OH) 2 /CC exhibits a low cell voltage of 1.40 V @10 mA cm −2 for the FOR||HER. This study highlights the importance of modulating metal’s electronic structure and identifying active sites, which has great potential for improving bifunctional electrocatalytic reactions.
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高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 2
·497-506
·
IF 2.482
Gao Xiaoxia,Wang Jiang,Xu Aiju,Jia Meilin
4Ni–Al layered double hydroxide (LDH) precursors were prepared by the following three methods: constant pH coprecipitation, variable pH coprecipitation and urea hydrolysis. The 4Ni–Al mixed metal oxide (MMO) catalysts were obtained by the calcination of LDH precursors at 600 °C, and their catalytic performances in ODHP from 350 to 550 °C were tested. The 4Ni–Al MMO from the urea hydrolysis method showed a higher and more stable propylene selectivity of ca. 40% with propylene yield of ca.11% at 500 °C, and that from the constant pH coprecipitation method was followed, while oxidative cracking of propane occurred on the 4Ni–Al MMO from the variable pH coprecipitation method. It is considered to be closely related to the dispersion and stability of the surface Ni(II) species through comprehensive analysis of XRD, N 2 -adsorption-desorption, TEM, XPS, H 2 -TPR and In-situ electrical conductivity. The urea hydrolysis method with a low salt concentration, leading to an excellent stability of the surface Ni(II) species at high reaction temperature, should be selected to prepare Ni–Al MMO catalysts for ODHP instead of the traditional variable pH coprecipitation method with a high salt concentration. Graphic
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Qihao Li,Xin Wang,Cheng Li,Xinwei Yang,Lichao Jia,Jian Li
NiMn 2 O 4 (NMO) coated Gd-doped CeO 2 (GDC) and NiO powders are prepared by a hydrothermal method for the anode of a metal (Ni-10 at.% Fe)-supported solid oxide fuel cell fueled by wet CH 4 (3 vol.% H 2 O). NMO remains on NiO but dissolves into GDC at 1400 °C. Upon reduction in H 2 at 700 °C for 2 h, Ni nanoparticles exsolve on the doped-CeO 2 (DCO) substrate (DCO@Ni), while MnO nanoparticles form on Ni (Ni@MnO). DCO@Ni demonstrates high catalytic activity for reforming wet CH 4 and high resistance to carbon deposition with a yield of H 2 increasing from 11 (500 °C) to 33 (700 °C) ml min −1 and remaining around 25 ml min −1 at 600 °C for 30 h. The metal-supported single-cell with a Ni@MnO-DCO@Ni anode shows high initial and durable electrochemical performance with a maximum power density increasing from 160 (500 °C) to 720 (700 °C) mW cm −2 and a cell voltage remaining above 0.55 V at 600 °C for 200 h under 400 mA cm −2 and 20 ml min −1 . Such high performance is ascribed to the metal support with low ohmic resistance and the engineered anode with high catalytic activity and enhanced resistance to carbon deposition.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Changhui Liang,Hongjun Fan,Aiqun Kong,Mao Peng,Menghui Liu,Weizhuo Xu,Jian Song,Yongxin Li,Jinli Zhang,Yunjie Ding,Z. Conrad Zhang
The hydrogen evolution reaction (HER) activity of Pt-based electrocatalysts in alkaline solution is typically limited by the rate of water dissociation. Herein, we report a facile one-step strategy in the synthesis of Pt/Ni(OH) 2 heterojunction for enhanced HER activity. Ultrathin Ni(OH) 2 nanosheets decorated with uniformly dispersed Pt nanoparticles at average sizes of 2.2 nm are in-situ grown on nickel foam (NF) with binder-free feature under mild conditions due to induction by ethylene glycol diethyl ether, even without adding extra Ni 2+ sources. The synthesized Pt/Ni(OH) 2 /NF shows superior HER activity in 1.0 M KOH solution, achieving low overpotentials of 42, 91, and 114 mV at current densities of 10, 100, and 200 mA cm −2 and outstanding durability for 25 h at 25 mA cm −2 without noticeable Pt agglomeration. This work offers a mechanistic insight into one-step fabrication of Pt/Ni(OH) 2 -based catalyst with high activity and stability for HER.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yaxin Qin,Fengfeng Zhou,Tingting Wang,Wei Liu,Lizhi Zhang
The remarkable stability and detrimental environmental impacts of nickel(II)-ethylenediaminetetraacetic acid (Ni(II)-EDTA) complexes originated from electroplating effluents have sparked a growing curiosity about their efficient remediation. In this study, L -cysteine functionalized zero-valent iron (C-ZVI bm ) was synthesized via a ball-milling method and employed as a heterogeneous Fenton-like catalyst to decomplex Ni(II)-EDTA and immobilize Ni(II) from wastewater. The results demonstrated that the pseudo-second-order kinetic rate constant (2.096 L·mol −1 ·min −1 ) for EDTA degradation in the C-ZVI bm /H 2 O 2 system was 123.3 times that in the ZVI bm /H 2 O 2 system (0.017 L·mol −1 ·min −1 ). The incorporation of L -cysteine onto the surface of ZVI significantly enhanced the H 2 O 2 activation, reactive oxygen species ( OH, O 2 − , and 1 O 2 ) generation, and the sequential Ni(II)-EDTA decomplexation and EDTA degradation. The results of capture experiments revealed that 1 O 2 played a crucial role in the degradation of EDTA in the C-ZVI bm /H 2 O 2 system. The optimization of the experimental variables indicated that the degradation of EDTA and the reduction/adsorption of Ni(II) were antagonistic in the C-ZVI bm /H 2 O 2 system, resulting in an efficient reduction/immobilization of Ni(II) and an inhibition of EDTA degradation at a higher dosage of C-ZVI bm . Our findings provide new insights into the promising heterogeneous Fenton-like process that enables the decomplexation of Ni(II)-EDTA, the degradation of EDTA, and the synchronous immobilization of Ni(II).
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高影响因子
RARE METALS
·
2025
·
IF 11
He Shuai,Zhao Man,Zhao Peipei,Ma Jiamin,Liu Chunmei,Xiao He,Zhang Li,Zhang Junming,Hu Tianjun,Wang Shengxiang,Pang Huan,Jia Jianfeng
Nickel-based catalysts display promising potential in integrated hydrogen production through methanol electrooxidation (MOR). The unavoidable self-oxidation from Ni(OH) 2 to NiOOH severely restricts their MOR performance. To inspire the progress of MOR before self-oxidation of Ni species by altering reaction pathways, a heterostructured Ni–WO 2 catalyst is constructed to follow the direct electrooxidation pathway of methanol. In-situ/ex-situ characterization techniques combined with density functional theory calculations reveal the constructed Ni–WO 2 heterostructure alters the electronic structure of Ni site. It’s found Ni–Ni bond in Ni–WO 2 becomes longer and the electrons transfer from Ni sites to W sites. This results in upshifted d band center of Ni site and its closing to the Fermi energy level, which optimizes the CH 3 OH adsorption and the deprotonation of *CH 3 O into *CH 2 O in potential-determining step. Moreover, the formed asymmetric adsorption sites increase the polarity of the methanol and the intermediate. As expected, CH 3 OH molecule is highly converted into HCOOH via direct electrooxidation pathway. This obtained Ni–WO 2 exhibits superior MOR activity with high peak current density of 325.26 mA cm −2 and performs long term of 90 h at 10 mA cm −2 in hydrogen production. This work provides an important guidance for designing efficient Ni-based samples for direct electrooxidation of methanol. Graphical abstract
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高影响因子
POLYMER
·
2024
·
IF 4.1
Tingting Liu,Baijun Liu,Mingyao Zhang
Anisotropic conductive adhesives (ACAs) provide an efficient and easy method of interconnecting small electronic devices compared to traditional solder joint connections. In this paper, PS@Ni/Au metal composite microspheres with excellent electrical conductivity in the size of 2.76 μm were prepared by chemical plating technique and in situ redox method. The effects of PS@Ni metal composite microspheres with different shell thicknesses and compactness on the preparation of Ni–Au bimetallic shell layers were investigated, and the effects of different Au:PS@Ni mass ratios on the volumetric conductivity of PS@Ni/Au metal composite microspheres were discussed. The composite microspheres were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), energy spectrometry (EDS), and X-ray diffraction (XRD). Thick and compact Ni metal shells are the key to preparing PS@Ni/Au metal composite microspheres with the complete degree of encapsulation. When the mass ratio of Au:PS@Ni was 0.15:1, the conductivity was as high as 1.3 × 10 5 S cm −1 . The acrylate pressure-sensitive containing 3.1–8.3 vol% conductive particles presented an obvious anisotropy. When the mass ratio of the conductive particles was higher than 8.3 vol%, the conductive particles appear to be significantly aggregated. The research ideas and methods have great application potential for replacing the traditional solder joint connections.
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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.
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2025
·
IF 7.7
Yi Lin,Zaixing Wang,Lina Tang,Shi Jiang,Yu Guo,Xiaoqin Liu
Ni-based catalysts supported on composite metal oxides (NiO-Al 2 O 3 , MgO-Al 2 O 3 , Co 3 O 4 -Al 2 O 3 ) were synthesized via coprecipitation followed by Ni impregnation to investigate the influence of support composition on catalyst stability in methane steam reforming. Accelerated deactivation protocols (methane decomposition, high-temperature sintering, hydrothermal oxidation) revealed hydrothermal oxidation as the primary cause of irreversible deactivation. The 10Ni/NiAl catalyst (10 wt% Ni/10 wt% NiO-Al 2 O 3 ) showed remarkable regenerability after 923 K hydrothermal treatment, fully restoring its activity. This was attributed to coexisting reduced Ni species and readily reducible NiO, facilitating rapid reactivation. Other catalysts formed thermally stable NiAl 2 O 4 , leading to permanent deactivation. Methane cracking at 973 K had negligible effect, and 10Ni/NiAl catalyst exhibited the lowest carbon deposition (17.02 %). Under extreme hydrogen purged at 1223 K, only the 10Ni/CoAl catalyst exhibited a minor activity decline. The superior stability of 10Ni/NiAl was attributed to an in situ-formed NiAl composite metal oxides during 973 K calcination, which effectively anchored Ni particles, suppressed sintering, and prevented extensive oxidation.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Lei Zhao,Zilong Zhang,Tianyuan Zhang,Xiang Wang,Huanjun Peng,Jingdong Peng
The Fenton reaction in advanced oxidation processes is an ideal pathway for the generation of highly reactive hydroxyl radicals (•OH). However, its application in organic wastewater treatment is limited due to the requirement for acidic pH conditions and the additional introduction of H2O2 and Fe2+. In this study, FeOOH–CN/Ni(OH)2 composites were constructed as photocatalysis-self-Fenton catalysts by the amorphous FeOOH, which was uniformly anchored onto the surface of pure g-C3N4 (carbon nitride (CN)), and Ni(OH)2 was assembled on top. In this process, FeOOH–CN/Ni(OH)2 achieved self-sufficiency in H2O2 production while enabling efficient degradation of tetracycline hydrochloride (TCH) over a wide pH range, with a degradation ratio of up to 98.82%, and a first-order reaction rate constant (k) was determined to be 0.04925 min–1, representing a 10.15 times enhancement compared to the pristine CN. A reasonable S-scheme heterojunction charge migration mechanism was demonstrated based on valence-band X-ray photoelectron spectroscopy (VB-XPS), atomic force microscopy (AFM) equipped with a Kelvin probe force microscope, and density functional theory (DFT) theoretical calculations. Furthermore, degradation experiments demonstrated that the catalyst possesses remarkable degradation efficiency for other contaminants as well. On one hand, this significant improvement can be attributed to the formation of an S-scheme heterojunction between Ni(OH)2 and CN, which not only increased the specific surface area of the composite but also remarkably enhanced the separation and transfer efficiency of photogenerated charges. On the other hand, the synergistic effect between Ni and Fe effectively facilitated the activation of H2O2 and promoted the cycling of Fe3+/Fe2+. This study provided an efficient visible-light-driven photocatalysis-self-Fenton system, offering novel perspectives for enhancing Fenton-based processes and advancing the application of Fenton reactions in the treatment of organic wastewater.
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PubMed
高影响因子
Catalysts
·
2026
·Vol. 16
·期 5
·409
·
IF 4.5
Linhao Zhang,Hong Liu,Jianming Zhang,Fagen Wang
Harnessing low-grade thermal energy from industrial processes and the environment represents an attractive route toward sustainable chemical production. In this work, we report a thermoelectrocatalytic (TE-Catal) system capable of converting small temperature gradients into chemical energy for hydrogen peroxide (H2O2) generation. A hybrid catalyst composed of nickel-based metal–organic frameworks (Ni-MOFs) nanoparticles integrated with carbon nanotubes (CNTs), Ni-MOFs/CNTs, was synthesized through a facile one-pot strategy. Under a temperature gradient, the thermoelectric response of the Ni-MOFs induces charge carrier generation through the Seebeck effect, enabling interfacial redox reactions that produce H2O2. However, rapid recombination of thermally generated carriers typically limits catalytic efficiency. By coupling Ni-MOFs with conductive CNTs networks, charge separation and transport are significantly enhanced due to the strong interfacial interaction and the high electrical conductivity of CNTs. As a result, the Ni-MOFs/CNTs nanohybrids exhibit greatly improved H2O2generation rate of ~111.7 µmol g−1h−1compared with pristine Ni-MOFs (31.8 µmol g−1h−1). Thermoelectric electrochemical measurements confirm that the CNT incorporation effectively promotes carrier migration and suppresses recombination. This study demonstrates the potential of MOF-based thermoelectric nanostructures for transforming waste heat into valuable chemical products.
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