CARBON
·
2023
·
IF 10.9
Hao Wang,Jiangwen Liao,Jiajun Zhong,Yunpeng Liu,Lei Yao,Lixiong Qian,Yuecheng Lai,Xin Wang,Yikun Li,Jianxin Song,Xueqing Xing,Guang Mo,Zhongjun Chen,Zhonghua Wu
In this paper, the unclear Ni atom coordination structure evolution in one-pot pyrolysis method synthesizing Ni single atom catalyst using graphitic carbon nitride as support (Ni-g-C 3 N 4 ) was deeply discussed. In-situ X-ray absorption fine structure spectra and other assisted methods were used to characterize the structural evolution. The results demonstrate that the pyrolysis process can be divided into three stages. In the first stage from room temperature to 183 °C (Stage I), the NiCl 2 ⋅6H 2 O was mixed with the supporting material (dicyandiamide) to form the precursor with Ni-(H 2 O) 6 octahedral coordination configuration. In the second stage from 183 to 350 °C (Stage II), the H 2 O molecules have been removed and the supporting material was converted to melamine. The melamine molecules were polycondensed to melem during 308–350 °C. The intermediates labeled Ni-melamine and Ni-melem was formed with Ni-N 4 planar quadrilateral coordination configuration. In the third stage from 350 to 600 °C (Stage III ), the supporting material (melem) was gradually converted to g-C 3 N 4 , and the Ni-N 4 coordination configurations were replaced by Ni-N 6 planar hexagon coordination configuration one by one. The three Ni coordination configurations were further confirmed by Reverse Monte Carlo simulations and ab initio calculations .
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Catalysts
·
2018
·Vol. 8
·期 5
·200
·
IF 3.465
Shiying Han,Yunfei Liu,Jiang Li,Rui Li,Fulong Yuan,Yujun Zhu
A series of Pd-Ni bimetallic catalysts supported on SBA-15 (0.2%Pd-x%Ni/SBA-15, x = 0.4, 0.7, and 1.2) were prepared through the impregnation method combined with the NaBH4reduction method. X-ray diffraction (XRD), N2adsorption-desorption, X-ray photoemission spectroscopy (XPS) and transmission electron microscope (TEM) were used to characterize the prepared catalysts. All the synthesized catalysts were evaluated for the liquid-phase hydrogenation of cinnamaldehyde (CAL). The addition of Ni obviously enhanced the CAL conversion and selectivity of C=C hydrogenation to hydrocinnamaldehyde (HALD) over the 0.2%Pd-x%Ni/SBA-15 catalysts. Meanwhile, 0.2%Pd-1.2%Ni/SBA-15 showed the best performance with 96.3% conversion and 87.8% selectivity toward HALD. This improvement was attributed to the synergistic effect between the Pd and Ni nanoparticles, enhancing the dispersion of Pd metal particles and increasing the content of surface Pd0species. In addition, the influences of a few reaction factors including H2pressure, reaction temperature, and reaction time were studied over 0.2%Pd-1.2%Ni/SBA-15.Keywords:selective hydrogenation;cinnamaldehyde;hydrocinnamaldehyde;synergistic effect;Pd-Ni/SBA-15
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Hongyan Chen,Yani Ai,Fan Liu,Xing Chang,Yuan Xue,Qi Huang,Chi Wang,Hualin Lin,Sheng Han
Hierarchical nanoarchitecture and composition can offer preponderances for enhancing pseudocapacitor performances. This paper reports on the three-dimensional hierarchical carbon-coated Ni–Mn layered double hydroxide on nickel foam (LNC) electrode material prepared via a facile two-step hydrothermal reaction. The resulting performance of the LNC composite material has high specific capacitance (1916 F g −1 ) and good cycling stability (91% retention after 5000 charge–discharge cycles). Moreover, the material can be directly used as an integrated flexible electrode with excellent rate capability (79.5% retention at 10 A g −1 ), which is significant in practical applications and large-scale syntheses. Furthermore, the LNC materials acting as a positive electrode for the asymmetric supercapacitor also exhibit high specific capacitance of 120.67 F g −1 at 0.5 A g −1 and excellent cycling stability with 84.2% capacitance retention after 5000 cycles at a current density of 5 A g −1 .
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RSC Advances
·
2024
·Vol. 14
·期 12
·8293-8302
·
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.
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CHINESE JOURNAL OF CATALYSIS
·
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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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Luyang Zuo,Rui Li,Qi Liu,Yabing Duan,Hongwei Wang,Huitao Fan,Bo Li,Liya Wang
Solar energy-assisted hydrogen production technology is an essential tool for exploring hydrogen energy. To date, semiconductors have been used as the primary photocatalyst to generate hydrogen via photocatalytic water splitting. However, the high photogenerated electron–hole recombination rate of semiconductor photocatalysts results in a low hydrogen production rate. Herein, the synergistic effect of Mo-ion doping and the incorporation of Ni-based Hofmann-type coordination polymer (Ni–Ni HCP) on the photocatalytic performance of ZnIn 2 S 4 (ZIS) is investigated. The hydrogen production rate of the prepared in-situ Mo doped ZnIn 2 S 4 wrapped Ni-Ni HCP (Ni–Ni HCP/Mo–ZIS) sample under visible-light irradiation is 26.7 mmol g −1 h −1 , which is 10 times that of pure ZIS. Hydrogen production rate test, microscopic characterization, and density functional theory calculation confirm that the proposed dual modulation approach (combined ion doping and heterogeneous structure construction) could effectively increase the photocatalytic efficiency of ZIS. The stability of prepared samples is also examined by four-cycle photocatalytic hydrogen production tests. The proposed integrated method opens a new route for advancing renewable energy technology towards a sustainable future.
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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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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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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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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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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 46
·19700-19707
·
IF 2.7
Nan Zhou,Fanyi Kong,Ya Tang
The traditional impregnation method for preparing supported catalysts often faces challenges such as particle agglomeration and weak support–metal interactions. This study focuses on utilizing the exsolution method to prepare Fe, Co, and Ni supported catalysts from ABO3-type perovskites, aiming to overcome these challenges. Experimental results show that LaBO3 perovskites with different B site metals (B = Fe, Co, Ni) exhibit different metal exsolution kinetics in the ammonia synthesis reaction. LaNiO3 demonstrates an initial activity of 782.2 μmol g−1 h−1 within the first 2 hours of the reaction, maintaining stability beyond 80 hours. In contrast, LaFeO3 and LaCoO3 exhibit prolonged initiation periods for the metal exsolution process, reaching activities of 7873.8 μmol g−1 h−1 and 8046.7 μmol g−1 h−1, respectively, after approximately 80 hours. The degree of B-site metal exsolution was investigated using X-ray absorption fine structure (XAFS) and Rietveld refinement of XRD data, revealing exsolution rates of 72.03%, 69.3%, and 86.3% for Fe, Co, and Ni, respectively, after 80 hours of reaction. This study not only introduces the exsolution method for ammonia synthesis but also empirically validates several computational predictions, thereby supporting both theoretical and practical research.
研究领域:
催化
·
材料科学
·
化学工程
·
无机化学
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