SURFACE REVIEW AND LETTERS
·
2017
·
IF 0.491
FEI LI,JINGDE ZHANG,JUNPENG LUAN,YALEI LIU,JIANXUN HAN
The NiO/YSZ anode materials of SOFCs with Bi 2 O 3 as sintering aids were successfully prepared by dry-pressing process. The effects of Bi 2 O 3 content on the sintering properties of NiO/YSZ anode materials were studied, including the effects on the density, open porosity, weight loss, phase composition, microstructure, mechanical strength and electrical conductivity. In particular, the weight loss, relative density and bending strength of the sintered NiO/YSZ ceramics increased with the increase of Bi 2 O 3 content while the open porosity decreased gradually. The density of the NiO–YSZ ceramics with 6 wt.% Bi 2 O 3 sintered at 1250 ∘ C could reach that of the ceramics without Bi 2 O 3 sintered at 1400 ∘ C. For Bi 2 O 3 concentration higher than 6 wt.%, phase transformation of zirconia from monoclinic to cubic structure occurs, causing volume change and microcracks in the anode materials. Therefore, the optimum adding amount of Bi 2 O 3 is 6 wt.%, which can reduce the sintering temperature to 1250 ∘ C. The ceramics with 6 wt.% Bi 2 O 3 have relatively high bending strength and low sintering temperature. This is of great significance for improving the performance of the anode and cutting the cost.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2018
·Vol. 11
·期 5
·575-581
·
IF 2.073
Changhao Feng,Zhongwei Jiang,Bin Chen,Pengfei Cheng,Yinglin Wang,Chengzhi Huang
One-dimensional nanomaterials with controlled morphology have received considerable attention as chemical sensors. Herein, we report a low-cost and facile method for manufacturing chemical sensors based on Al-doped NiO nanofibers. The structures and morphologies of the samples were characterized by SEM, TEM, SAED and XRD. Chemical sensors with 3 mol% Al-doped NiO nanofibers showed a response of 10.4 to 200 ppm methanol. The transient, dynamic, repeatability, selectivity, and long-term stability characteristics of the obtained sensors were tested, which indicated that these chemical sensors were promising for detecting methanol vapor in air.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2019
·Vol. 4
·期 1
·164-170
·
IF 4.912
Shijian Luo,Xiaoman Li,Wanguo Gao,Haiqiang Zhang,Min Luo
Today, industrial ammonia synthesis mainly depends on the Haber–Bosch process, which causes a lot of energy consumption and huge CO2 emissions. The electrochemical N2 reduction reaction (NRR) is considered a more sustainable and environmentally benign alternative to produce ammonia, but it requires an efficient catalyst to overcome the difficulty of N2 activation. In this work, we reported that MOF-derived C@NiO@Ni microtubes behaved as a high-efficiency electrocatalyst in 0.1 M KOH electrolyte. This electrocatalyst achieved a high NH3 yield of 43.15 μg h−1 mgcat.−1 and faradaic efficiency of 10.9% at −0.7 V vs. a reversible hydrogen electrode. The experimental results indicated that the excellent NRR performance originated from the oxygen vacancies in NiO. Moreover, the abundant NiO/Ni interfaces were conducive to proton adsorption and further enhanced the NRR performance.
研究领域:
材料科学
·
电化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 9
·3693-3701
·
IF 2.8
Tang Xiao,Wang Zhenwei,Cai Dandan,Shao Qinsi,Qin Ziwei,Liu Yang,Li Wenxian,Li Ying,Zhang Jiujun
Design and synthesis of high-performance and low-cost electrocatalysts for methanol oxidation reaction (MOR) are of great significance in energy conversion applications. In this work, g-NiO/CuO composites with high catalytic performance for MOR are successfully synthesized by a template method using g-C 3 N 4 flakes as the sacrificial template. NiO nanoparticles are dispersed uniformly on the surface of the pine needle-liked CuO substrate, resulting in a synergistic effect which can enhance the electrocatalytic MOR activity and stability of g-NiO/CuO catalysts. The catalyst shows a maximum peak current density of 159 mA cm −2 and also long-term stability. The bimetal-oxide-synergistic strategy in this work highlights a promising way for the design of catalysts with high electrochemical performance for direct methanol fuel cells (DMFCs).
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Tian Tian,Fang Liu,Xiaoying Zhang,Jiali Wang,Shengting Li,Wei Chen,Yufei Song,Jinping Li,Guang Liu
In the field of solid hydrogen storage , Magnesium hydride (MgH 2 ) is the promising material. However, the practical application was hindered due to slow kinetics performance and unfavorable thermodynamic property. In this study, porous nanosheet NiO was prepared by the calcination of Ni(OH) 2 synthesized using the hydrothermal way and subsequently introduced in MgH 2 by ball milling . The resulting MgH 2 -5 wt% NiO material conveyed significantly enhanced hydrogen storage property. The initial dehydrogenation temperature was decreased to 210 °C, which is 114 °C lower than that of Ball-milling MgH 2 . The MgH 2 -5 wt% NiO released 6.4 wt% H 2 within 10 min at 300 °C.And at room temperature it begins to uptake hydrogen. The MgH 2 -5 wt% NiO composite also displayed excellent cyclic stability, retaining the 96.2 % of capacity retention rate after 40 cycles. Furthermore, added NiO catalyst reduced the hydrogen desorption activation energy of MgH 2 from 133.69 ± 12.55 kJ/mol to 81.47 ± 7.48 kJ/mol. The superior performance owed to the in-situ generation of Mg 2 Ni/Mg 2 NiH 4 during the reaction between NiO and MgH 2 . These intermediates act as the “hydrogen pump,” weakening the Mg–H bond strength to improving the hydrogen storage properties of MgH 2 . This study displays that the catalyst of porous nanosheet NiO can obviously better the hydrogen storage property of MgH 2 , making it a more viable candidate for practical applications.
研究领域:
材料科学
·
能源化学
·
纳米材料
·
固态储氢
·
催化化学
·
热力学与动力学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ge Ma,Xiaoyu Zhang,Guofu Zhou,Xin Wang
In this work, ultrathin NiO nanosheets (NS) supported Pt nanoparticles (NP) nanohybrids (termed as Pt-NP/NiO-NS) are synthesized by cyanogel-NaBH 4 method, in-situ reduction and calcination treatment, in which the thickness of Pt-NP/NiO-NS nanohybrids is only 1.8 nm and their specific surface area is as large as 171.5 m 2 g −1 . The Pt-NP/NiO-NS nanohybrids can efficiently act as a versatile electrocatalyst for both methanol oxidation reaction (MOR) and hydrogen evolution reaction (HER) in alkaline environment. At Pt-NP/NiO-NS nanohybrids, only a 57 mV overpotential is required to obtain a current density of 10 mA cm −2 for HER. The MOR current at Pt-NP/NiO-NS nanohybrids can achieve 179.9 mA cm −2 at 1.45 V potential, which is 15.9 times bigger than that at NiO-NS. The excellent electrocatalytic activity and durability of Pt-NP/NiO-NS nanohybrids can be ascribed to the morphology feature of NiO-NS and synergistic effect between Pt-NP and NiO-NS. The uniformly dispersed Pt-NP at NiO-NS can serve as active sites for HER. Meanwhile, Pt-NP can modify the electronic property of NiO-NS, and boost the formation of active Ni III OOH species. Consequently, a symmetric Pt-NP/NiO-NS||Pt-NP/NiO-NS methanol electrolyzer only requires 1.39 V electrolysis voltage for hydrogen production at cathode, accompanying with the production of value-added potassium formate at anode.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Acta Metallurgica Sinica-English Letters
·
2017
·Vol. 31
·期 2
·171-179
·
IF 1.292
Liu Pei-Jiang,Yao Zheng-Jun,Ng Vincent Ming Hong,Zhou Jin-Tang,Yang Zhi-Hong,Kong Ling-Bing
Microwave absorption properties of spherical NiO particles and Co 0.2 Ni 0.4 Zn 0.4 Fe 2 O 4 (CNZF) ferrites with single-layer and double-layer absorbers were studied in the frequency range of 2–18 GHz. The spherical NiO particles were synthesized by using a hydrothermal process, while the CNZF powders were prepared by using a sol–gel autoignition method. The double-layer absorbers, composed of 30 wt% NiO as matching layer and 30 wt% CNZF as absorption layer, with a total thickness of 3.2 mm, exhibited a maximum reflection loss ( R
L ) of –67.0 dB at 9.2 GHz and an effective absorbing bandwidth below –10 dB to be 3.9 GHz from 7.0 to 10.9 GHz. The excellent microwave absorption performance of the double-layer absorbers should be ascribed to the high impedance matching ratio, the great microwave attenuation capability, and well-coupled layer.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xiao-fang Li,Xiao-qiang Feng
The combination of photocatalyst and biochar is an effective strategy to improve the overall photocatalytic activity, but it is still a challenge to find photocatalyst with excellent photocatalytic activity and biochar with large surface and rich oxygen functional groups. In this study, a novel CS-biochar/ZnO/NiO composite with adsorption-photocatalytic performance was constructed using chitosan as biochar source, and exploited for visible-light-driven photocatalytic degradation of tetracycline (TC) and Congo red (CR). The superior photocatalytic activity of CS-biochar/ZnO/NiO than pristine ZnO, NiO and CS-biochar/ZnO under visible light, and 63 %-CS/ZnO/NiO composite has the best photocatalytic activity. The photodegradation efficiency for CR was 94.5 % within 100 min, and the apparent rate constant (k) was 0.0206 min −1 , which is about 1.87 and 3.89 times that ZnO and NiO, respectively. For TC, the photodegradation efficiency was 90 % within 45 min, and k was 0.0377 min −1 , which is about 1.74 and 2.86 times that bare NiO and ZnO, respectively, which attribute to the synergistic effect between ZnO/NiO and CS-biochar improved the activity of photocatalysts. This work presents a straightforward approach for improving photocatalytic antibiotic and dye degradation through the construction of bifunctional "hybrid" material, which have great potential for application in the removal of contaminants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 16
·9126-9135
·
IF 3.049
Huiya Wang,Yanlin Zhang,Qiuyue Wang,Chaowei Jia,Pan Cai,Gang Chen,Chengjun Dong,Hongtao Guan
Electromagnetic absorption materials have gained increasing attention. In this study, we report NiO decorated biomass porous carbon derived from pine nut shells as a promising microwave absorbing material by a facile strategy. The NiO/biomass porous carbon (BPC) is thermally converted from Ni(OH)2/BPC with BPC as the base for precipitation. All products were characterized by XRD, Raman, and SEM techniques, which reveals that the NiO nanoflakes were uniformly self-assembled on the surface of the activated carbon. Compared with counterparts of pure Ni(OH)2 and Ni(OH)2/BPC, a large reflection loss peak of −33.8 dB at 16.4 GHz is achieved for the NiO/BPC composites, and the absorption bandwidth less than −10 dB can reach up to about 6.7 GHz (from 11.3 to 18.0 GHz) with a thickness of 8 mm. The enhanced microwave absorption properties originate from the electric/dielectric polarization and the unique NiO decorated BPC structures. The expanded interfaces, such as NiO–NiO, Ni–BPC and NiO–paraffin interfaces in the complicated porous composites, could boost the interfacial polarization as well as related relaxation which results in enhanced dielectric loss and electromagnetic absorbing properties. In addition, NiO/BPC nanocomposites exhibit comparatively better matching of permittivity and permeability. It is expected that our present investigation could provide a new possibility for biomass based fabrication of potential microwave absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Wangchang Geng,Pengfei Song,Xinrou Cao,Libing Duan
Metal-organic frameworks (MOFs)-derived metal oxides are characterized by high porosity, large specific surface area, controllable composition, and tunable pore size, which make them have good potential as gas sensing materials. In this paper, Ni 3 V 2 O 8 @NiO hollow microspheres derived from bimetallic Ni/V-MOFs were synthesized using a three-step method (solvothermal method, cation-exchange method, and annealing process). XRD, Raman, SEM, TEM, XPS, and BET techniques were employed to investigate the structure, morphology, specific surface area, pore size distributions, elemental composition, and chemical state of Ni 3 V 2 O 8 @NiO composites. Gas sensing performance studies showed that the NV@NiO-2 sensor exhibited higher response (43.7) to 100 ppm triethylamine at a lower operating temperature (240℃), shorter response/recovery time (88 s/127 s), higher selectivity, lower detection limit (4.5 ppb), and better repeatability. In addition, the NV@NiO-2 sensor exhibited a strong linear relationship (R 2 = 0.996) between response and gas concentration across a range of 1–100 ppm. The present work serves as a valuable reference for the preparation of triethylamine sensing materials with high specific surface area, high porosity, high response and high selectivity.
研究领域:
材料科学
·
化学传感器
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2024
·Vol. 13
·期 1
·15
·
IF 2.8
Bo Zhang,Peiyu Yao,Fei Li,Li Pan,Wuwan Xiong,Yang Zhang,Xiang Li
Hydrogen production through the catalytic pyrolysis of low-value organic solid waste offers a promising low-carbon and environmentally friendly pathway. However, the design of efficient hydrogen-producing catalysts remains a significant challenge. Herein, NiO/Al2O3as a catalyst precursor was utilized to investigate the effects of reduction temperature gradients (300–800 °C) on the distribution of three-phase products and the composition of gaseous products during the pyrolysis of waste textiles. Compared to unreduced NiO/Al2O3, increasing the reduction temperature (300–700 °C) led to a gradual decrease in liquid-phase products and a notable increase in gas-phase products, with the latter rising by 10.59% at 700 °C. Most strikingly, hydrogen gas production increased by 6.42% under the same conditions. Multi-characterization analyses, including XRD, TEM, and H2-TPR, revealed significant aggregation of highly dispersed Ni species in NiO/Al2O3at higher reduction temperatures. The emergence of XRD characteristic peaks and the (111) crystal face of metallic Ni (Ni0) became apparent at 700 °C. More importantly, the XPS test inferred that the increasement of hydrogen-rich gas production was ascribed to the appropriate Ni0/Ni2+ratio, and the highest hydrogen yield of 41.50% was achieved as the Ni0/Ni2+ratio reached about 1.57. This work not only provides an effective solution for the consumption of waste textiles, but also converts it into high value-added hydrogen-rich gas.
研究领域:
能源科学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Caofeng Zhang,Fang Cui,Qinghai Ma,Tieyu Cui
NiO is considered as a promising electrode material owing to its high theoretical capacitance. However, the inherent low conductivity and huge volume expansion during cycling limit its practical application. Constructing composites is considered as an effective way to improve charge transfer efficiency and enhance electrochemical performance. Therefore, many researchers are devoted to combining NiO with other materials to build composites to solve this problem. However, the preparation of composites with uniformly distributed heterojunctions in a simple way remains a major challenge. Herein, porous NiO/CuCo 2 O 4 composites with uniformly distributed heterojunctions were fabricated via a facile and cost-effective method. Benefiting from the porous structure and the synergistic effect of NiO and CuCo 2 O 4 , the NiO/CuCo 2 O 4 –450 electrode exhibits outstanding specific capacitance of 962 F g −1 at the current density of 1 A g −1 . Additionally, with porous NiO/CuCo 2 O 4 –450 composites as anode and active carbon (AC) as cathode, the asymmetric supercapacitor (ASC) provides an energy density of 25.17 Wh kg −1 at a power density of 400 W kg −1 and an excellent cycle life. This study provides a facile and favourable strategy for the preparation of composites with distinguished electrochemical properties.
研究领域:
材料科学
·
电化学
✓ 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）