APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xia Wei,Yuhan Zhou,Tianyao Wang,Hongbin Dai,Song Li
The hydrazine oxidation reaction (HzOR) is essential for direct hydrazine fuel cells and offers a promising alternative to the kinetically sluggish oxygen evolution reaction in water splitting. In this work, we present the design and synthesis of a novel Ni-Zn-Cu catalyst with a three-dimensional (3D) interconnected hollow network structure for HzOR. This unique 3D hollow architecture, comprising Ni-Zn-Cu nanosheets, significantly enhances HzOR catalytic performance by increasing the number of accessible active sites and improving both mass and charge transport. Additionally, the incorporation of multifold nanotwins within the catalyst induces lattice strain and reduces coordination numbers, optimizing the electronic structure and d -band center to strengthen hydrazine adsorption and catalyst reactivity. The Ni-Zn-Cu catalyst exhibits remarkable HzOR performance, achieving a current density of 200 mA·cm −2 , and a mass activity of 10,129 A·g −1 at −0.05 V vs. RHE, and a low onset potential of −0.15 V vs. RHE. Furthermore, it retains 96 % of its initial activity after 20 h of continuous electrolysis. This work marks a significant advancement in the development of highly efficient and durable HzOR catalyst.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jiali Song,Yu Gao,Guoguo Tan,Qikui Man,Zhi Wang
Spinel ferrites are widely used for electromagnetic wave (EMW) absorption applications. In this study, spinel Ni–Zn ferrites with excellent microwave absorption properties were synthesized. Their EMW absorption characteristics and interaction mechanisms were studied to lay the foundation for the study of the role of Ni–Zn ferrite as a magnetic substrate for composites. Herein, Ni 0 · 5 Zn 0 · 5 Fe 2 O 4 was prepared by the hydrothermal method (H-NZFO) and the sol–gel auto-combustion method (S-NZFO); both samples exhibited distinct microwave absorption properties. The S-NZFO absorber (thickness = 3.72 mm) demonstrated the best dual-zone microwave absorption with two strong reflection loss peaks at 5.1 and 10.5 GHz. The corresponding effective absorption bandwidth (EAB) reached 9.0 GHz, which covered part of the S-band and all of the C- and X-bands. These results were attributed to the high saturation magnetization, outstanding complex permeability, and multiple magnetic loss channels of S-NZFO. The H-NZFO sample exhibited excellent absorption capability and matching thickness. At a thickness as low as 1.71 mm, the minimum reflection loss ( RL min ) of the H-NZFO absorber reached -60.2 dB at 13.1 GHz. The maximum bandwidth corresponding to RL below -10 dB was 4.6 GHz. These results can be attributed to small particle size, high complex permittivity, and multiple dielectric loss channels of H-NZFO. The observed wide effective absorption bandwidth of S-NZFO and strong microwave absorption capability of H-NZFO suggest the potential of both materials as substrates for efficient microwave absorbers in military as well as civilian absorption 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
RSC Advances
·
2025
·Vol. 15
·期 33
·26950-26958
·
IF 4.6
Chunqiu Zhao,Qiang Chang,Fu Yin,Jing Li,Guowei Niu,Hulin Wang,Dan Liu,Bhekie B. Mamba,Chenghua Zhang,Alex T. Kuvarega
One-step CO hydrogenation to value-added chemicals represents a prominent yet challenging research objective for conventional catalysis processes in chemical industry. Herein, we report a rationally designed Ni-doped Zn-NC catalyst embedded within an N-doped carbon matrix for one-step CO hydrogenation to dimethyl ether (DME), demonstrating superior CO conversion compared to the pristine Zn-NC catalyst (25.9% vs. 20.6%) while both maintaining high DME selectivity (>93%). Structural characterization revealed that Ni atoms existed in a bimetallic coordination environment, which is crucial for the promoting effect of Ni. In contrast, Ni nanoparticles incorporated into Zn-NC (nanoNi–Zn-NC) reduced CO conversion to less than 17% despite retaining high DME selectivity (>92%). Besides, control catalysts containing either Ni-only or Ni/Zn nanoparticles supported on carbon support exhibited limited catalytic activity and mainly produced hydrocarbons. This work provides valuable insights into the active sites of the bimetallic Ni–Zn-NC catalysts and elucidate the structural effects of bimetallic systems for CO conversion to DME. Furthermore, this study offers a feasible framework for optimizing Zn-based bimetallic catalysts.
研究领域:
催化化学
·
化学工程
·
材料科学
·
能量转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Ning Zhang,Chuanhui Huang,Ping Tong,Zunmei Feng,Xiaoping Wu,Lan Zhang
Volatile polycyclic aromatic hydrocarbons (PAHs) in water and soil are associated with status in the human body. Development of simple, efficient detection method is challenging due to the coating could be attacked by the abundance of water in the direct-immersion solid-phase microextraction. The stability of coating is essential to the analysis results. In this paper, a stable Ni-Zn MOF/g-C 3 N 4 (MG NFs) nanoflowers with cavity traps structure was firstly reported and acted as solid-phase microextraction (SPME) adsorbent for PAHs. Markedly enhanced moisture and acid stability of the MG NFs was obtained through the doping the hydrophobic graphitic carbon nitride (g-C 3 N 4 ) and metal ions into metal organic frameworks (MOFs). The aperture environment and ambient environment of MG NFs were changed by the doping of the Ni and the g-C 3 N 4, respectively. The moisture and acid stability of MG NFs were prominently increased under the dual protection. Compared to commonly used commercial coatings, the MG NFs own large surface area, unique nanoflowers structure and numerous open metal sites on the nanosheets, which demonstrated significant extraction superiority for PAHs. The MG NFs coated fiber was used for the SPME preconcentration of PAHs and couped with GC–MS for detecting PAHs. It presented low detection limits (0.1–3.0 ng L −1 ), wide linearity (0.3–5000.0 ng L −1 ) and good linearity (the correlation coefficient >0.9951). The inter-day and intra-day relative standard deviation (RSD) (n = 3) for three replicate extractions using one fiber was 3.8%–9.1%, and 3.5%–9.2%, respectively. The fiber-to-fiber reproducibility (n = 3) was 4.2–11.8%. The coupling method was successfully applied in the analysis of real water and soil samples with satisfactory recoveries of 82.9–109.2%, 84.2–106.4%, and the corresponding RSDs were 2.4–11.3%, 3.6–10.8%, respectively. The results indicated the effectiveness of NG NFs coated fiber in further practical application.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Dan Xu,Jiale Wei,Taolin Yu,Fujia Ben,Xinyuan Zhou,Wenping Cao,Wenjie Zhao
The BaTi 1- x (Ni 0.5 Zn 0.5 ) x O 3 ( x = 0–0.10) ceramics are prepared by conventional sintering strategy. With increasing Ni/Zn co-doping, a continuous phase transition between BaTiO 3 (BT) polymorphs is demonstrated in this work. The phase composition evolution of orthorhombic(O)/tetragonal(T)-T/cubic(C)/hexagonal(H)-H phase can be observed in Ni/Zn co-doped BT ceramics. Owing to the successive transition of this phase structure, the micro morphology is modulated from normal circular grains to elongated morphology structure. Meanwhile, the strong ferroelectricity of the pure BT with O/T symmetry is gradually suppressed, and eventually disappears in the high-concentration Ni/Zn co-doped BT ceramics ( x = 0.08, 0.10) with H symmetry. The oxygen vacancy defects induced by Ni/Zn acceptor doping at local Ti-sites are responsible for the continuous phase transformation. To maintain charge balance, A-site Ba vacancy and the reduction of Ti 4+ to Ti 3+ is generated and hence, the polar displacement of Ti-O ions is restrained in multiphase coexistence samples. For the low Ni/Zn content of x = 0.02, the broadened phase transition region is advantageous for energy storage application. The energy storage density ( W rec ) of the x = 0.02 sample is 0.49 J/cm 3 and corresponding energy efficiency ( η ) is 85 % at 140 kV/cm. The variation in electrical properties is closely associated with phase structure evolution and defects/defect dipoles caused by Ni/Zn co-doping. Our work is instructive for the design and engineering the phase composition and morphology structure of BT-based ceramics.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
✓ 已验证
产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2022
·Vol. 135
·期 5
·2533-2550
·
IF 1.843
Chen Wei,Bao Zhichang,Zhou Zhiming
A series of non-precious bimetallic NiM x /SiO 2 (M = Zn or Co) catalysts with a fixed Ni loading of 5 wt% and different molar ratios of M/Ni (0.004–1.97) were prepared by glucose pyrolysis and applied to the selective hydrogenation of phenylacetylene. The properties of the catalysts were characterized by N 2 physisorption, CO chemisorption, ICP-OES, TGA, XRD, HRTEM, XPS, and DRIFTS. The activity and selectivity of the bimetallic catalysts could be tuned by varying the Zn/Ni and Co/Ni molar ratios, which were almost independent of the metal particle size (with a similar size of 4.1–5.5 nm), but predominantly determined by the geometric and/or electronic effects of the catalysts. Among all the catalysts studied, NiZn 0.05 /SiO 2 and NiCo 0.09 /SiO 2 presented higher selectivity to styrene (86.3% and 88.0%, respectively) at above 99% conversion of phenylacetylene. The high selectivity of the former was attributed to the geometric and electronic effects of the Ni–Zn alloy, while the latter was due to the geometric effect caused by the addition of Co. The activity and selectivity of NiCo 0.09 /SiO 2 were maintained during six consecutive cycles, indicating its good stability in the selective hydrogenation of phenylacetylene.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·
IF 29.4
Ye Feng,Chao Gao,Dazhi Xie,Lu Liu,Bin Chen,Suyi Liu,Haihong Yang,Zhan Gao,Daniela A. Wilson,Yingfeng Tu,Fei Peng
Neural stem cells (NSCs), with the capability of self-renewal, differentiation, and environment modulation, are considered promising for stroke, brain injury therapy, and neuron regeneration. Activation of endogenous NSCs, is attracting increasing research enthusiasm, which avoids immune rejection and ethical issues of exogenous cell transplantation. Yet, how to induce directed growth and differentiation in situ remain a major challenge. In this study, a pure water-driven Ni–Zn micromotor via a self-established electric–chemical field is proposed. The micromotors can be magnetically guided and precisely approach target NSCs. Through the electric–chemical field, bioelectrical signal exchange and communication with endogenous NSCs are allowed, thus allowing for regulated proliferation and directed neuron differentiation in vivo. Therefore, the Ni–Zn micromotor provides a platform for controlling cell fate via a self-established electrochemical field and targeted activation of endogenous NSCs.
研究领域:
生物医学工程
·
神经科学
·
细胞生物学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Yiwei Tang,Junyan Fu,Yicong Wang,Haixin Guo,Xinhua Qi
Hydrogenation of levulinic acid to γ-valerolactone is one of the important reactions for conversion of biomass into renewable fuels and chemicals. Ni-Zn non-noble bimetallic catalysts supported on ordered mesoporous carbon (Ni-Zn@OMC) were prepared by one-pot solvent evaporation induced self-assembly (EISA) method and used for hydrogenation of levulinic acid to γ-valerolactone (GVL) in water. A GVL yield of 93% was obtained over bimetallic Ni 1 -Zn 1 @OMC catalyst at 180 °C in 90 min reaction time, with a turnover frequency (TOF) of 686.4 h −1 . Compared with Ni@OMC, the incorporation of Zn metal leads to the formation of Ni-Zn alloy and high dispersion of Ni particle on the catalyst surface . NiO sites on the catalysts lowered competitive adsorption between H 2 and levulinic acid on Ni 0 sites, as well as the Ni-Zn alloy is beneficial to the activation of carbonyl group in levulinic acid, and they synergistically promote the hydrogenation of levulinic acid to 4-hydroxyvaleric acid (4-HVA). Zn content in the catalyst influences both the activity of Lewis acid sites and the ratio of Lewis acid to Brønsted acid sites, and the active sites of Ni δ– Zn δ+ can facilitates the weakening and cleavage of C-O in 4-HVA, both of them are beneficial to the dehydration of 4-HVA to GVL.
研究领域:
催化
·
可再生能源
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 6
·1-11
·
IF 2.8
Zhang Zhengyu,Yang Yujie,Chen Congliang,Chen Dongyang,Zhang Yingming,Meng Yuting,Li Hao
In this study, Ni–Zn–Co ferrite doped with (Al 3+ ) was synthesized by solid-phase synthesis method and its structure was analyzed. By analyzing the X-ray diffraction (XRD) data, it was explained that the Ni 0.45 Zn 0.40 Co 0.15 Fe 2-x Al x O 4 (0 ≤ x ≤ 0.15) ferrite has a single-spinel structure with FD-3 m space group. Additionally, by analyzing the XRD data, it is found that the lattice constant is the largest when Al 3+ is undoped. The range of lattice constant is (8.3751 ~ 8.3900) Å, the range of saturation magnetization ( M s ) is (68.77 ~ 79.39) emu/g, and the range of coercivity ( H c ) is (9.04 ~ 13.10) Oe. When the content of Al 3+ is 0.09, the permeability reaches the highest. In conclusion, the results obtained indicate that this ferrite is suitable for low-frequency electronic devices and also confirm that Fe 3+ was successfully replaced with Al 3+ . This paper provides a new idea for the study of spinel-structured ferrites by doping Al 3+ .
研究领域:
材料科学
·
固体物理
·
磁学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xinhui Sun,Yanjie Chen,Mengmeng Ji,Weiya Zhang,Zhizhong Sun,Wenyi Chu,Xin Wang
Developing efficient bimetallic Ni/Zn metal organic frameworks (MOFs) derived Ni 3 ZnC 0.7 alloy catalyst for cyclization reactions is highly anticipated. Bimetallic Ni/Zn- PTA MOFs with flower-like microspheres morphology was synthesized by using a facile hydrothermal method and used as a precursor for preparation of the catalyst. Then, a ZnO supported Ni-Ni 3 ZnC 0.7 incorporated carbon catalyst (Ni-Ni 3 ZnC 0.7 /ZnO-C) was obtained by deriving from the Ni/Zn- PTA MOFs through one-step pyrolysis. The developed Ni-Ni 3 ZnC 0.7 /ZnO-C catalyst was used as a recoverable heterogeneous catalyst for synthesis of 2-arylbenzimidazoles by cyclization reaction of phenylmethanamines and 2-nitroanilines in good yields. Various characterizations (e.g. SEM/EDX, XRD, TEM, FT-IR, XPS and Raman) revealed that the catalyst exhibited good performance for cyclization reaction, which are ascribed to particular hierarchical structure, as well as synergistic effect between Ni and Ni 3 ZnC 0.7 . As a result, the Ni-Ni 3 ZnC 0.7 /ZnO-C catalyst showed excellent stability and activity for the condensation cyclization reaction. This bimetallic MOFs-derived Ni-Ni 3 ZnC 0.7 catalyst opens up a potential way for fabricating other Carbon supported alloy catalysts in heterogeneous catalysis reactions.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Ningyu Chen,Jintang Zhou,Zhengjun Yao,Yiming Lei,Ruiyang Tan,Yuxin Zuo,Wenjian Zheng,Zibao Jiao
The electromagnetic materials are featured by good magnetic permeability and dielectric constant characteristics, which are of significant importance in solving the pollution problem of electromagnetic. In this study, after the complete of the use of sol-gel method, argon gas was then introduced for calcination , and eventually a new type of MWCNTs/Ni 0.5 Zn 0.5 Nd 0.04 Fe 1.96 O 4 composites was synthesized after the above mentioned procedures. The synthesized MWCNTs were able to be adsorbed on the surface of Ni 0.5 Zn 0.5 Nd 0.04 Fe 1.96 O 4 and could form a good conductive work of 3D. Also, the effect of additional MWCNTs on microwave absorption properties of MWCNTs/Ni 0.5 Zn 0.5 Nd 0.04 Fe 1.96 O 4 composites were also observed in this study. The results indicate that the additional MWCNTs function to significantly improve the microwave absorption property of MWCNTs/Ni 0.5 Zn 0.5 Nd 0.04 Fe 1.96 O 4 . Through altering the amount of MWCNTs, the microwave attenuation performance and impedance matching coefficient of this electromagnetic materials can be effectively improved. The S2 sample presented a minimum reflection loss of −35.05 dB when its thickness reached 1.6 mm, meanwhile, the effective absorption bandwidth achieved 4.55 GHz. The prepared composites perform well in microwave absorption, which can attribute to the reasonable ratio of composites as well as its interaction with both of the magnetic and dielectric components. This research paved the way for novel ideas to be put in the electromagnetic absorption materials with high-efficient.
研究领域:
材料科学
·
电磁材料
·
微波吸收
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhaopeng Xia,Jiajun Pan,Hao Chen,Nanping Deng,Chao Yang,Xiaochen Liu,Yong Liu,Liwei Wu
Many researches are devoted to design the wearable fibrous energy storage devices with miniaturization in order to satisfy the large demand of power for portable wearable electronics. As a kind of flexible battery, one-dimensional yarn-like nickel-zinc (Ni-Zn) battery has a lot of disadvantages such as low energy density and poor power density. Significantly, metal–organic framework (MOF) material provides an opportunity to solve the preceding shortcomings due to its porous structure, excellent specific surface area and multi-functionalization. In this study, the nickel cobalt layered double hydroxides (NiCo LDHs) with triangular micro sheet array and nano sheet structure is designed and prepared on silver coated nylon fibers (SCNF) as the flexibly fibrous Ni-Zn battery cathodes (SCNF@Ni@MOF@NiCo LDHs yarn electrode), which have high specific surface area and super structure stability even during bending of the yarn. Therefore, the cathodes have abundant active sites, excellent electron conduction and fast ion diffusion. The assembled aqueous Ni-Zn battery is featured with suitable capacitance (342 mAh/g at 7.6 A/g), appropriate energy density (572.5 Wh/g at 2.59 W g −1 ) and superior stability (55 % after 5000 cycles). In addition, the obtained one-dimensional yarn-like Ni-Zn battery has excellent flexibility and high capacity retention (90 % after 1000 bends and over 80 % after different deformation ways such as bend, squeeze and twist). These fascinating results demonstrate that the SCNF@Ni@MOF@NiCo LDHs yarn electrode have great application potential in wearable energy storage devices.
研究领域:
材料科学
·
能源存储
·
纳米技术
·
可穿戴技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）