Energy Technology
·
2019
·Vol. 7
·期 9
·1900374
·
IF 3.163
Zhong Ma,Dewang Zeng,Shuai Zhang,Rui Xiao
NiFe 2 O 4 oxygen carrier (OC) presents higher oxygen carrying capacity than single metal oxides (NiO and Fe 2 O 3 ). However, the redox ability of NiFe 2 O 4 gets deactivated due to phase segregation. Herein, the investigation of the effect of supports (CeO 2 , CeZrO 2 , and ZrO 2 ) on the phase stability and the redox performance of NiFe 2 O 4 during the chemical looping (CL) process are presented. The structure of NiFe 2 O 4 -based OCs is characterized using different characterization methods. The CL reaction is conducted in a fixed-bed reactor at 900 °C under alternate 5% CO/N 2 and 5% O 2 /N 2 atmospheres. The results indicate that the redox performance and the phase stability of NiFe 2 O 4 -based OCs are significantly affected by the supports. According to experimental results, CeO 2 can improve the oxygen mobility of NiFe 2 O 4 . The CeO 2 –NiFe 2 O 4 OC has the best performance in terms of both recyclability and phase stability during the redox cycles. The results show that CeO 2 –NiFe 2 O 4 can reduce the tendency of Fe segregation due to the high concentration of oxygen vacancies. It can be reduced and reoxidized to the original crystalline phase of NiFe 2 O 4 . Nevertheless, the CeZrO 2 –NiFe 2 O 4 and ZrO 2 –NiFe 2 O 4 OCs have drawbacks related to serious sintering and phase segregation into Fe 2 O 3 .
研究领域:
材料科学
·
化学工程
·
能源化学
·
催化化学
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 41
·19642-19650
·
IF 3.5
Chu Yican,Yao Zhendong,Liu Min,Li Wenqing,Gu Jing,Huang Zhenguang,Xie Jiaxing,Li Chao,Cui Yongfu,Li Yun,Fan Meiqiang
The hydrolysis of silicon and its compounds to produce hydrogen for fuel cell remains a major problem. The main obstacle is the weak hydrolytic activity and slow kinetics of silicon. In this work, the alloying properties of Si and Ca to improve its hydrolytic activity, and studied the film breaking effect of different metals and halogen ions on its passivation layer. The results show that the hydrogen production of the alloy is still determined by its phase composition. Among the common metal (Ni, Bi, Sn) and halogen ions (F – , Cl – ) catalyzed by hydrolysis, Ni and F – showed a good synergistic effect, resulting in a hydrogen yield of 269 mL/g at room temperature without alkali. Graphical
The effects of metal ions and halogens on the hydrolytic properties of Ca–Si alloy were investigated, and Ni 2+ and F — showed good synergistic effect.
研究领域:
材料化学
·
能源材料
·
无机化学
·
氢能源
·
金属合金
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 31
·期 8
·1912-1921
·
IF 5.6
Zhang Leyi,Jin Hongyu,Liao Hanxin,Zhang Rao,Wang Bochong,Xiang Jianyong,Mu Congpu,Zhai Kun,Xue Tianyu,Wen Fusheng
Electronic devices have become ubiquitous in our daily lives, leading to a surge in the use of microwave absorbers and wearable sensor devices across various sectors. A prime example of this trend is the aramid nanofibers/polypyrrole/nickel (APN) aerogels, which serve dual roles as both microwave absorbers and pressure sensors. In this work, we focused on the preparation of aramid nanofibers/polypyrrole (AP15) aerogels, where the mass ratio of aramid nanofibers to pyrrole was 1:5. We employed the oxidative polymerization method for the preparation process. Following this, nickel was thermally evaporated onto the surface of the AP15 aerogels, resulting in the creation of an ultralight (9.35 mg·cm −3 ). This aerogel exhibited a porous structure. The introduction of nickel into the aerogel aimed to enhance magnetic loss and adjust impedance matching, thereby improving electromagnetic wave absorption performance. The minimum reflection loss value achieved was −48.7 dB, and the maximum effective absorption bandwidth spanned 8.42 GHz with a thickness of 2.9 mm. These impressive metrics can be attributed to the three-dimensional network porous structure of the aerogel and perfect impedance matching. Moreover, the use of aramid nanofibers and a three-dimensional hole structure endowed the APN aerogels with good insulation, flame-retardant properties, and compression resilience. Even under a compression strain of 50%, the aerogel maintained its resilience over 500 cycles. The incorporation of polypyrrole and nickel particles further enhanced the conductivity of the aerogel. Consequently, the final APN aerogel sensor demonstrated high sensitivity (10.78 kPa −1 ) and thermal stability. In conclusion, the APN aerogels hold significant promise as ultra-broadband microwave absorbers and pressure sensors.
研究领域:
材料科学
·
电磁学
·
传感器技术
·
纳米科技
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yongjie Wang,Dongshuo Li,Yingju Yan,Li Li,Guotao Xiang,Sha Jiang,Ruiheng Pan,Xiantong Tang,Chuan Jing,Xianju Zhou,Yaroslav Zhydachevskyy,Andrzej Suchocki
Broadband shortwave infrared (SWIR) light-emitting diodes (LEDs) have attracted significant attention due to their widespread applications in spectroscopy, food industry, agriculture, optical communications, night vision, and biomedical technologies. Nevertheless, their performance remains limited by the critical phosphor layer's low quantum efficiency and narrow emission bandwidth. This work presents a series of Ni 2+ -doped spinel phosphors emitting in the SWIR range with high efficiency and tunable broadband emission. Upon UV illumination, normal spinel MgAl 2 O 4 :Ni 2+ phosphors exhibit an emission range of 1100–1600 nm and an internal quantum efficiency (IQE) of 5.2 %. By contrast, the inverse spinel MgGa 2 O 4 :0.02Ni 2+ demonstrates a significantly improved IQE of 77.2 % and excellent thermal stability (62.9 %@423 K), achieved by cation substitution. Furthermore, the significant spectral tuning over a broad range of 405 nm is realized through In 3+ cation- and F − anion-substitution in MgGa 2 O 4 :0.02Ni 2+ . Finally, SWIR pc-LEDs incorporating MgGa 2 O 4 :Ni 2+ phosphors were fabricated, and its potential applications in night vision, high-penetrating imaging, and non-destructive detection were evaluated. This work offers a promising pathway for developing tunable near-infrared light sources, thereby expanding their applicability across a range of advanced technologies.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2017
·
IF 2.299
Jian Zeng,Wangdong Zeng,Heping Zeng
Photocatalytic hydrogen generation is a considerable promising technology to decrease climate change effect of CO 2 and to solve the increasing global demand for clean energy. Hydrogen generation driven by visible light still faces many challenges although great efforts have been made. Efficient charge separation plays an important role in solar-energy conversion by heterojunction photocatalysts . Herein we report that nickel ferrites covered by gold plasmonics form well-defined plasmonic photocatalysts for fluorescein-sensitized hydrogen production under visible-light irradiation with largely enhanced photoactivity due to fast separation of photogenerated electron-hole pairs. The optimal Au/NiFe 2 O 4 plasmonic photocatalysts with AuNP loading of 1.5 wt% shows the hydrogen production rate of 0.256 mmol g −1 h −1 via localized surface plasmon resonance effect of AuNPs . Fluorescein was acted as photosensitizer to extend the visible-light absorption of Au/NiFe 2 O 4 plasmonic photocatalysts and enhance photocatalytic hydrogen generation efficiency under visible-light irradiation. The optimum rate for hydrogen generation reached 3.162 mmol g −1 h −1 and the rate is about 60-fold and 12-fold higher than that of pure NiFe 2 O 4 and 1.5 wt% Au/NiFe 2 O 4 plasmonic photocatalysts, respectively.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2024
·
IF 7.4
Zebang He,Zhong Wu,Zhiming Gao,Zhenbo Qin,Juntao Yuan,Yuan Gao,Yaorong Feng,Anqing Fu,Chun Wang,Wenbin Hu
A Ni-Al-Cu coating was prepared on NAB alloy through electroplating and heat treatment, and the erosion-corrosion behaviors were investigated. The results demonstrated that Ni-Al-Cu coating exhibited higher erosion resistance compared to NAB alloy, with an average reduction of 63 % in material removal rate (MRR). It was revealed that deformation and cracks were observed in NAB, with loss of hard κ and β phases alongside deformation of ductile α phase. Meanwhile, Ni-Al-Cu coating experienced fatigue delamination and grain disintegration due to alternating stress. Taguchi design method showed that increasing flow velocity and sand concentration could enhance the intensity of gravel impact, while changes in the erosion angle affected gravel impact modes and energy transfer, thereby impacting corrosion performance. Additionally, empirical equations for the material removal rate were derived through regression analysis, which became possible to predict the MRR under different influencing factors and assess the erosion-corrosion resistance of materials.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
Research
·
2020
·
IF 0
Jiapeng Ji,Ying Sha,Zeheng Li,Xuehui Gao,Teng Zhang,Shiyu Zhou,Tong Qiu,Shaodong Zhou,Liang Zhang,Min Ling,Yanglong Hou,Chengdu Liang
The shuttle effect hinders the practical application of lithium-sulfur (Li-S) batteries due to the poor affinity between a substrate and Li polysulfides (LiPSs) and the sluggish transition of soluble LiPSs to insoluble Li2S or elemental S. Here, we report that Ni hexatomic clusters embedded in a nitrogen-doped three-dimensional (3D) graphene framework (Ni-N/G) possess stronger interaction with soluble polysulfides than that with insoluble polysulfides. The synthetic electrocatalyst deployed in the sulfur cathode plays a multifunctional role: (i) selectively adsorbing the polysulfides dissolved in the electrolyte, (ii) expediting the sluggish liquid-solid phase transformations at the active sites as electrocatalysts, and (iii) accelerating the kinetics of the electrochemical reaction of multielectron sulfur, thereby inhibiting the dissolution of LiPSs. The constructed S@Ni-N/G cathode delivers an areal capacity of 9.43 mAh cm-2 at 0.1 C at S loading of 6.8 mg cm-2, and it exhibits a gravimetric capacity of 1104 mAh g-1 with a capacity fading rate of 0.045% per cycle over 50 cycles at 0.2 C at S loading of 2.0 mg cm-2. This work opens a rational approach to achieve the selective adsorption and expediting of polysulfide transition for the performance enhancement of Li-S batteries.
研究领域:
材料科学
·
能源化学
·
电化学
✓ 已验证
DOI
CATALYSIS LETTERS
·
2017
·Vol. 147
·期 10
·2515-2522
·
IF 2.799
Zhang Zhenwei,Jiang Xingmao,Hu Jianheng,Yue Chuanjun,Zhang Jintao
Mesoporous nitrogen-doped carbon was synthesized in a controlled manner by a modified deep eutectic solvent method using silica nanoparticles as templates. Various amounts of urea and glucose, which contain hydrogen acceptor and hydrogen bond donor groups were heated and stirred to form homogeneous liquid precursors like deep eutectic solvents, and nitrogen element was uniformly dispersed on an atom scale. Ni-Mo sulfides supported on mesoporous carbon with varying N dopping exhibit excellent hydrodesulfurization (HDS) catalytic performance such as high conversion and good recycling stability in the HDS of dibenzenethiophene. Further investigation showed that a suitable N content in the carbon support enhance the HDS properties and the HDS conversion could reach up to 96%. Graphical
研究领域:
材料化学
·
催化化学
·
纳米材料
·
能源化学
·
环境催化
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lin Cheng,Min Xie,Yitong Sun,Hong Liu
Constructing Z-scheme heterojunction is considered to be a promising strategy to isolate photogenerated carriers and boost the activity of the photocatalysts . Here in, a novel Z-scheme Bi 2 WO 6 /Ni-MOF heterojunction with intimate interface was constructed via wrapping flowerlike Bi 2 WO 6 on 2D Ni-MOF sheets. The resultant Bi 2 WO 6 /Ni-MOF heterojunction displayed superior photocatalytic performance with respect to methylene blue degradation under visible light illumination. When the content of Ni-MOF was 20 wt%, the Bi 2 WO 6 /Ni-MOF heterojunction achieved the highest activity, which was 24.0 and 6.4 folds that of the pristine Ni-MOF and Bi 2 WO 6 , respectively. The superior degradation performance was caused by the formation of a direct Z-scheme heterostructure between Ni-MOF and Bi 2 WO 6 , which boosted the separation of photoinduced carriers. The principal active species and possible photocatalytic mechanism were also explored. This study provides a pathway to design and fabricate efficient Z-scheme photocatalysts for environmental remediation.
研究领域:
材料科学
·
环境化学
·
光催化
·
纳米材料
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hanwei Zhang,Xiaoyun Zhang,Tianyi Zeng,Aichun Dou,Panpan Zhang,Mingru Su,Yu Zhou,Yunjian Liu
The application of Ni-rich ternary cathode materials is restricted by the irreversible phase transition and interfacial side reactions during long-term cycling. Herein, a LiTaO 3 coating and Ta 5+ doping strategy are simultaneously achieved by a simple solid-phase synthesis. The surface side-reaction and undesired phase transition of LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) are effectively restrained by this approach, which utilizes residual lithium to afford the coating. The NCA-LTO 3 (The modified NCA with a LiTaO 3 coating content of 3 wt%) delivers a high reversible capacity of 168.04 at 5 C (140.56 mAh g −1 for NCA), revealing the enhanced rate capability. More importantly, the cycling life could be greatly maintained after 200 cycles with a significant capacity retention of 94.1% (61.2% for NCA) at 1 C. Mechanism analysis indicates that such improvement is ascribed to the coating of conductor LiTaO 3 and doping Ta 5+ greatly promoting the Li-ion diffusion and stabilizing the interface of NCA. The study proposes a highly convenient strategy for interfacial optimization of cathode materials toward assisting the large-scale production of high-performance NCA.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态化学
·
电池技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Dongsheng Dai,Lu Wang,Nan Xiao,Songsong Li,Hao Xu,Shuang Liu,Boran Xu,Da Lv,Yangqing Gao,Weiyu Song,Lei Ge,Jian Liu
Efficient noble-metal-free semiconductor composite photocatalysts are highly desirable for visible light driven water splitting. In this study, Ni 2 P was successfully decorated on Zn 0.5 Cd 0.5 S as a highly efficient co-catalyst via a hydrothermal method . The chemical as well as photophysical properties of the as-obtained Ni 2 P/Zn 0.5 Cd 0.5 S samples were characterized by X-ray diffractometry (XRD), Transmission electron microscope (TEM), UV–vis diffusion reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) and time-resolved fluorescence. The Ni 2 P/ Zn 0.5 Cd 0.5 S composite sample with 4% molar content of Ni 2 P showed the highest photocatalytic H 2 evolution activity with a corresponding H 2 evolution rate of 1173 μmol h −1 , which was about 13 times higher than that of pure Zn 0.5 Cd 0.5 S sample under visible light irradiation. The photocatalytic activity of the Ni 2 P/Zn 0.5 Cd 0.5 S composite sample was stable even after 4 cycling photocatalytic experiments. A possible mechanism on the photocatalytic enhancement of the Ni 2 P/Zn 0.5 Cd 0.5 S composite sample was systematically investigated, which can provide a novel concept for the synthesis of other desirable semiconductor materials with high photocatalytic performance.
研究领域:
材料科学
·
光催化
·
能源化学
·
半导体催化
·
清洁能源
✓ 已验证
DOI
高影响因子
TRANSITION METAL CHEMISTRY
·
2013
·Vol. 38
·期 4
·463-471
·
IF 1.184
Zhang Nan,Fan Yu-Hua,Bi Cai-Feng,Zhao Yu,Zhang Xia,Zhang Dong-Mei,Huang Gui-Mei
A pair of stereoisomers of nickel Schiff base complexes, namely [Ni(C 17 H 15 N 4 O 2 ) 2 ·2CH 3 OH] n ( 1 ) (C 17 H 15 N 4 O 2 = 2-acetylpyrazine- l -tryptophan) and [Ni(C 17 H 15 N 4 O 2 ) 2 ·2CH 3 OH] n ( 2 ) (C 17 H 15 N 4 O 2 = 2-acetylpyrazine- d -tryptophan), were synthesized and characterized by physico-chemical and spectroscopic methods. The X-ray diffraction single-crystal analyses indicate that the structure of 2 is essentially 0D monomeric, while a 2D layer structure is formed through N–H…O intermolecular hydrogen bonds for 1 . The interactions between complex 1 and calf thymus DNA were investigated by spectroscopic and viscometric methods. The results indicate that complex 1 interacts with DNA very strongly ( K
b = 1.01 × 10 7 mol −1 L and K
sq = 1.11). The nature of the binding seems to be mainly an electrostatic interaction between DNA and the complex. However, other binding modes, such as hydrogen bonding, may also be present in this system.
研究领域:
无机化学
·
配位化学
·
生物无机化学
·
分子药理学
·
核酸化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）