CHINESE JOURNAL OF CATALYSIS
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2024
·
IF 15.7
Hongyu Qu,Wende Hu,Xiangcheng Li,Rui Xu,Xiao Han,Junjie Li,Yiqing Lu,Yingchun Ye,Chuanming Wang,Zhendong Wang,Weimin Yang
Selective hydrogenolysis of biomass-based platform compounds is of great importance for the production of chemicals and fuels. Herein, we reported that the catalyst of Ni-C 3 N 4 supported on H 2 activated carbon (HC) synthesized by a simple coordination-impregnation-pyrolysis method is efficient for the hydrogenolysis of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF); the yield of 94.2% can be obtained in a batch reactor and the lifetime of greater than 120 h can be achieved in fixed-bed experiment. It is demonstrated that Ni nanoparticles coated by graphitic C 3 N 4 shell were highly dispersed on the surface of HC and the Ni loading is as low as 0.86 wt%, beneficial to the anti-sintering of Ni nanoparticles during the reaction. Both XPS characterizations and theoretical calculations reveal that Ni 3 N is the intrinsic active component for the hydrogenolysis , which exhibits efficient activity for the dissociation of C–O bond. This work opens up a new avenue to develop catalysts with single non-noble metal component for the efficient conversion of biomass-based chemicals.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Liangbin Xia,Qing Wang,Fang Wang,Yaru Li,Yining Cao,Yongpeng Ren,Ihar Razanau,Kunming Pan
Nickel-based catalysts demonstrate considerable promise for the hydrogen evolution reaction (HER), yet attaining both exceptional activity and sustained durability under prolonged operation persists as a critical research challenge. Herein, a directed self-growth strategy is employed to synthesize Ni-MOF nanosheets with a well-ordered morphology on the nickel foam (NF) surface via strong acid etching followed by ligand introduction. The dense Ni2+ layer generated by acid etching, as a seed, promotes strong bonding between the Ni-MOF and the NF substrate, which accelerates electron transport to the active layer and prevents catalyst detachment during long-term operation. Additionally, the Ni/NiO heterostructure obtained via pyrolysis forms an electron transfer channel that optimizes *H and *H2O adsorption on the Ni side while facilitating *OH desorption through its migration to the NiO domain, collectively contributing to improved HER kinetics. In situ Raman spectra reveal the evolution of key intermediates during the HER, corroborating the DFT predictions and highlighting the critical role of interfacial H2O structures in catalytic performance. The obtained S-Ni-MOF/NF-400 catalyst exhibits an ultralow overpotential (20 mV–10 mA cm–2), surpassing commercial Pt/C catalysts. Moreover, long-term stability tests demonstrate significant improvements in durability. This work not only introduces an outstanding Ni-MOF-based catalyst but also presents a novel strategy for designing highly active and stable HER catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Baosong Li,Weiwei Zhang,Dandan Li
Ni–Co and Ni–Co/ZrO 2 composite coatings have been synthesized via a single-step direct current (DC) electrodeposition route as a protective coating. The influences of electrodeposition current density, time and ZrO 2 concentration on structural, composition and properties of Ni–Co coating were investigated. All coatings present compact, crack-free and nodular-like morphology in a nanocrystalline structure. Some aggregations still exist in the coating. The preferred orientation of these coatings changed from (200) to (111) texture with a fcc structure . The amount of Co in Ni–Co matrix slightly decreases as current density and time increases. The Co and ZrO 2 content in Ni–Co/ZrO 2 matrix increase with the increasing of ZrO 2 concentration in bath. Less than 60 min is beneficial for low roughness of Ni–Co/ZrO 2 coating. Current density, deposition time and ZrO 2 embedded in metallic matrix affect the hardness of Ni–Co alloy. Ni–Co/ZrO 2 coating has enhanced hardness compared to Ni–Co ones. Although they might not exhibit the best corrosion resistance in the initial immersing stage, Ni–Co/ZrO 2 composite coating obtained at 2 – 4 A dm −2 with 5–10 g L -1 ZrO 2 presents the better corrosion resistance and desirable performance stability during the long-term immersion process in aggressive media. The Ni–Co/ZrO 2 coating exhibits promising advantages as a protective coating.
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Plasma Processes and Polymers
·
2024
·
IF 2.9
Qinlong Song,Xianyi Yin,Haibao Zhang
Designing efficient noble metal-free catalysts for plasma-catalytic ammonia synthesis is significant and challenging. Carbon-based metal catalysts were prepared at different pyrolysis temperatures using the Ni-MOF-74 precursor. The effects of Ni-MOF-74 and its derived carbon-based metal catalysts on pulsed dielectric barrier discharge (DBD) plasma ammonia synthesis were investigated. The results showed that Ni-MOF-74-300 with both the MOF structure and nickel metal particles exhibited the best catalytic performance for ammonia synthesis. The ammonia synthesis rate reached 41.38 mmol g −1 h −1 , whereas the nitrogen conversion rate was as high as 1.54% with an energy yield of 3.04 g kWh −1 . Compared to the situation of plasma only, the ammonia synthesis rate, nitrogen conversion rate, and energy yield were increased by 28.46 times, 5.7 times, and 5.5 times, respectively.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Qiao Han,Mooeez Ur Rehman,Junhu Wang,Alexandre Rykov,Oliver Y. Gutiérrez,Yujun Zhao,Shengping Wang,Xinbin Ma,Johannes A. Lercher
The catalytic hydrodeoxygenation (HDO) of lignin-derived phenolic compounds is a critical step in the upgrading of bio-oil. Here, bimetallic Ni-Fe nanoparticles supported on mesoporous carbon spheres (MCSs) were fabricated and applied in HDO of phenol. In comparison with monometallic Ni and Fe catalysts, the bimetallic Ni-Fe catalyst exhibited better performance for phenol HDO due to the formation of Ni-Fe alloy phase identified by X-ray powder diffraction (XRD) and Mössbauer spectroscopy techniques. Among several explored ratios, the catalysts with Ni/Fe ratio of 3/1 presented the highest cyclohexane yield. The reaction occurred in two consecutive steps: the hydrogenation of phenol to cyclohexanol and the further hydrogenolysis of cyclohexanol to cyclohexane. Kinetic studies showed that the hydrogenolysis of cyclohexanol controlled the overall reaction rate of phenol HDO due to the lower reaction rate of this step. Indeed, the turnover frequency (TOF) values of cyclohexanol normalized by surface metallic Ni sites exhibited a linear correlation with Ni-Fe alloy sites. The alloying of iron in the bimetallic Ni-Fe catalysts significantly enhanced the adsorption strength of cyclohexanol, which is the reason of the high activity of the Ni-Fe alloy particles. Thus, Fe-containing sites adsorb the hydroxyl species while Ni sites perform the H 2 activation, their synergistic effect plays a key role in phenol HDO process.
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Molecular Catalysis
·
2020
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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.
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Materials Today Energy
·
2022
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IF 9.257
Juan Wen,Haodong Sun,Qi Zhou,Zaichun Liu,Ting Huang,Xi Chen,Xiaoyan Yang,Qinghong Huang,Yuhui Chen,Yuping Wu
Ammonia as a chemical substance is closely related to our daily life, and its production process has attracted researchers' attention. Due to its high energy consumption and high emission characteristics, the industrial Haber−Bosch process obviously cannot adapt to the sustainable development concept of low-carbon and environmental protection in today's society. The electrocatalytic nitrogen reduction reaction (NRR) technology is a promising method of converting unstable electrical energy into fuel for storage at ambient conditions. Here, a bimetallic catalyst, Co–Ni–S/Ni foam, is reported as an electrocatalyst to realize N 2 reduction. The in-situ growth strategy promotes the effective combination of Co 9 S 8 and Ni 3 S 2 on the Ni foam without any adhesive. The active centers of the bimetallic Co and Ni reasonably regulate the adsorption of various complex intermediates in the N 2 activation process, so that the Co–Ni–S/Ni foam has good N 2 activity. In 0.1 M Na 2 SO 4 , the designed electrocatalyst achieved an NH 3 yield of 5.05 × 10 −10 mol s −1 cm −2 at −0.6 V vs. RHE and an optimum Faradaic efficiency of 6.23% with good electrochemical stability and selectivity. Besides, the electrocatalytic sites were also evaluated in conjunction with density functional theory.
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MOLECULES
·
2010
·Vol. 15
·期 8
·5139-5152
·
IF 1.738
Lu Lin,Ying Liu
A series of Ni-based catalysts were prepared using hydrogen reduction of Ni/Al hydrotalcite-like compounds (Ni/Al HTlcs) synthesized by coprecipitation. The physico-chemical properties of Ni/Al hydrotalcite-like compounds and the corresponding Ni-based catalysts were characterized using inductively coupled plasma (ICP), BET surface areas, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) techniques. The results indicated that Ni/Al HTlcs with layered structures could be successfully prepared by the coprecipitation method, and the characteristic HTlcs reflections were also observed in the XRD analysis. The NiO and Ni0phases were identified in all Ni-based catalysts, which displayed randomly interconnected pores and no layer structures. In addition, the studies also found the Ni/Al HTlcs and Ni-based catalysts had high specific surface areas, low pore volumes and low pore diameters. The catalytic hydrogenation of ethyl acetate to ethanol with Ni-based catalysts was also investigated. Among the studied catalysts, RE1NASH-110-3 showed the highest selectivity and yield of ethyl acetate to ethanol, which were 68.2% and 61.7%, respectively. At the same time, a major by-product, butyl acetate, was formed due to an ester-exchange reaction. A proposed hydrogenation pathway for ethyl acetate over Ni-based catalysts was suggested.Keywords:hydrogenation;ethyl acetate;ethanol;Ni/Al hydrotalcite-like compounds
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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.
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PHYSICA B-CONDENSED MATTER
·
2025
·
IF 2.8
Xiaobo Wang,Congmian Zhen,Jiaxuan Feng,Xiaoxu Zhang,Lu Liu,Li Ma,Guoke Li,Dewei Zhao,Denglu Hou
Pure phase Ni-doped Co 3 O 4 nanoparticles (Ni x Co 3-x O 4 , 0≤x ≤ 1) were prepared using a hydrothermal method . At low doping concentrations, Ni preferentially enters the octahedral sites to replace the non-magnetic Co 3+ , and a new superexchange interaction is created between tetrahedral Co 2+ and octahedral Ni 3+ . A spin glass state was observed. The magnetic transition temperature of the Ni x Co 3-x O 4 powders significantly increases from 36 K to 236 K, and the saturation magnetization increases to 2.239 μ B /f.u. As the Ni content continues to increase, and Ni ions unexpectedly enter tetrahedral sites and new superexchange interactions are emerged. However, the superexchange interaction between tetrahedral Ni 2+ and octahedral Ni 3+ is weaker than that between tetrahedral Co 2+ and octahedral Ni 3+ . Meanwhile, tetrahedral Ni 2+ makes octahedral Co 3+ transform from low spin to high spin, resulting in a decrease in the total magnetization of the sample.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121304
·
IF 7.2
Bingqing Jing,Xuankun Li,Yu Tian,Chuanmiao Jiang,Zihan Feng,Tao Wang,Guanghui Li
Silicon carbide (SiC) membranes are distinguished by their high hydraulic permeability, exceptional chemical and thermal stability, and mechanical strength. Despite these advantages, membrane fouling limits their broader application in water treatment. This study presents electrically conductive Ni-coated SiC membranes (Ni@SiC), fabricated through conformal electroless nickel deposition. After Ni coating, the pure-water flux was 375.9 L·m⁻ 2 ·h⁻ 1 , closely matching the pristine membrane's 392.0 L·m⁻ 2 ·h⁻ 1 . Antifouling performance was evaluated using DC voltages from 0 to −2.0 V with bovine serum albumin (BSA), humic acid (HA), and sodium alginate (SA) as representative natural organic foulants. At −1.0 V, after 30 min filtration, normalized flux increased by 68.6 % for BSA, 24.6 % for HA, and 31.3 % for SA compared with the corresponding cases without voltage. For natural river water, applying −2.0 V further increased remaining permeate flux by 268.6 %. Physical backwashing only partially restored flux, irreversible fouling accumulated significantly after five cycles. In situ membrane cleaning via electro-activation of peroxymonosulfate (PMS) was conducted which achieved a 99.5 % flux recovery ratio under optimal conditions. This research shows that Ni plating on SiC membranes via electroless deposition enhances antifouling and in situ cleaning capabilities under electrically assisted systems, offering a promising solution for membrane-based water treatment.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yangyang Shi,Fengyi Yang,Li Tao
Developing electrocatalysts based on transition-metal carbides that can be utilized for commercial water splitting is a challenging endeavor. To address this challenge, we employed a novel approach that merged phase-inversion tape-casting and sintering, subsequently implementing a simple and efficient electrodeposition process, to synthesize Ni-activated and Ni–P-activated titanium carbide (Ni/TiC, Ni–P/TiC) ceramic electrodes as water splitting catalytic cathodes and anodes. These self-supported Ni/TiC and Ni–P/TiC electrodes are binder-free with abundant finger-like pores, which contribute to the formation of highly conductive skeleton and more exposed active sites for direct water splitting. These catalysts exhibit outstanding performance, superior to many reported bifunctional nickel-based catalysts supported on other substrates. Moreover, the exceptional electrocatalytic performance of the Ni/TiC and Ni–P/TiC catalysts is attributed to the synergistic effect between Ni oxides (phosphides) and TiC, as revealed by density functional theory (DFT) calculations. This self-template strategy paves the way for fabricating industrially applicable electrodes to generate hydrogen and oxygen through water splitting.
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