Nanoscale
·
2017
·Vol. 9
·期 43
·16764-16772
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IF 7.367
Yayun Hong,Chenlu Pu,Hongli Zhao,Qianying Sheng,Qiliang Zhan,Minbo Lan
In this work, we fabricated a yolk–shell magnetic composite that contains mesoporous TiO2 as the inner shell and flowerlike NiO as the outer shell (denoted as Fe3O4@H-TiO2@f-NiO) to reduce the limitations of single-component metal oxides in phosphopeptide enrichment. The NiO nanosheets play a synergistic role in phosphopeptide enrichment. And the unique flowerlike structure of NiO with sufficient space can facilitate the reversible insertion/extraction of peptides, which will have less impact on the enrichment process of the inner TiO2 shell. The yolk–shell structure and two types of porous nanostructures endowed this composite with a high surface area (156.58 m2 g−1) and a large pore volume (0.37 cm3 g−1). Owing to the high surface area and combined properties of TiO2 and NiO, the Fe3O4@H-TiO2@f-NiO microspheres showed a better performance for phosphopeptide enrichment than the same material without NiO nanosheets (Fe3O4@H-TiO2). According to the LC-MS/MS results, 972 unique phosphopeptides were identified from HeLa cell extracts with a high selectivity (91.9%) by Fe3O4@H-TiO2@f-NiO relative to 837 phosphopeptides (selectivity: 60.2%) by Fe3O4@H-TiO2. The results demonstrated that, compared with single-component metal oxides, composite metal oxides could enhance the selectivity and sensitivity for phosphopeptide enrichment.
研究领域:
生物化学
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分析化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Hongye Wang,Rui Huang,Cheng Tao,Hua Hao,Zhonghua Yao,Hanxing Liu,Minghe Cao
Dielectric capacitor with high energy storage density has become a pivotally enabling technology in electronic industry. The most critical factors affecting energy storage capacity are polarization and breakdown strength . Here the BaTiO 3 @ NiO double-hysteresis-loop ceramics with different polarization characteristics are prepared by changing the sintering atmosphere to control the defect structure . Results show that, the samples sintered in oxygen exhibit the obviously characteristics of double hysteresis loop, higher polarization and larger breakdown strength . In contrast, the samples sintered in nitrogen have lower polarization and breakdown strength and weaker double hysteresis loop. It is proved that the double hysteresis loop is caused by the defects of the inner layer and the outer layer by regulating the defect structure . Firstly, Low valence Ni ions replace Ti ions to form N i Ti '' − V o • • defect dipoles. These charged defect dipoles could be pinned the domain wall, and the existence of oxygen vacancies restricts the movement of the domain wall, making the material appeared a pinched hysteresis loop similar to the double hysteresis loop as observed in antiferroelectrics. Secondly, the local electric field generated by the depletion layer at the interface may also trigger a new polarization features in the material. This double hysteresis loop helps to improve the polarization and energy storage capacity of the material.Finally, the excellent energy storage density of the oxygen samples reaches up to 2.48 J cm −3 at 340 kV cm -1 with prominent cycle stability and temperature stability. This work provides a prospective method to fabricate material with high energy storage performance by the adjustment defect structure to control the polarization mechanism in the BaTiO 3 @1NiO ceramics.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 10
·15544-15556
·
IF 5.164
Xuerui Yi,Fengxiang Yin,Xiaobo He,Guoru Li
Summary Water splitting driven by renewable energy represents a sustainable way to store clean energy. However, its efficiency is limited by the kinetically sluggish oxygen evolution reaction (OER), calling for highly active catalysts to accelerate the reaction rate. Herein, NiO is reduced by cellulose through a hydrothermal method to obtain the highly active OER catalysts. The obtained cellulose-partially-reduced-NiO (CL-prNiO) shows a hybrid structure, composed of 3.6 wt.% face-centered cubic (fcc) Ni and 96.4 wt.% rock salt structured NiO with highly disordered interface. The CL-prNiO delivers a current density of 10 mA cm −2 with an overpotential of 288 mV, which is comparable to the commercial RuO 2 and outperforms many of the recently reported Ni-NiO based OER catalysts. As benefited from the hybrid and disordered structure, CL-prNiO shows great ability of converting Ni 2+ to Ni 3+ at a potential prior to the OER onset. The in situ generated Ni 3+ species can activate the lattice oxygen in the unreduced NiO of CL-prNiO, significantly boosting the OER activity.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 4
·352
·
IF 3.444
Dongdong Wang,Shuangde Li,Yingchao Du,Xiaofeng Wu,Yunfa Chen
Rational design LDHs (layered double hydroxides) with 3D hierarchical hollow structures have generated widespread interest for catalytic oxidation due to the high complexity in shell architecture and composition. Herein, we reported a handy two-step method to construct a 3D hierarchical NiCo2O4/NiO nanocage. This synthetic strategy contains a partial in situ transformation of ZIF-67 (zeolitic imidazolate framework-67) into Co-NiLDH yolk-shelled structures following ethanol etching, and a structure-preserved transformation from Co-NiLDH@ZIF-67 to a biphase nanocage following calcination. CoNi-yh-T (varied reaction time and calcination temperature) nanocages were investigated systematically by Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), H2- temperature-programmed reduction (TPR), NH3-temperature-programmed desorption (TPD) and studied for toluene oxidation. The CoNi-6h-350 sample showed much higher activity with 90% toluene conversion (T90) at 229 °C at a high space velocity (SV = 60,000 mL g−1h−1) than other catalysts (T90>240 °C). Abundant surface high valence Co ions caused by the novel hierarchical nanostructures, together with adsorbed oxygen species and abundant medium-strength surface acid sites, played a key role for catalytic activities.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·Vol. 26
·期 4
·3415-3423
·
IF 2.9
Shujuan Yin,Xueqian Zhang,Dongdong Liu,Xiaoxiao Huang,Yishan Wang,Guangwu Wen
Currently, it remains a challenge to make comprehensive improvements to overcome the disadvantages of volume expansion, Li2O irreversibility and low conductivity of SnO2. Heterostructure construction has been investigated as an effective strategy to promote electron transfer and surface reaction kinetics, leading to high electrochemical performance. Herein, NiO/SnO2 heterojunction modified nitrogen doped graphene (NiO/SnO2@NG) anode materials were prepared using hydrothermal and carbonization techniques. Based on the excellent structural advantages, sufficiently small NiO/SnO2 heterojunction nanoparticles increase the interfacial density to promote Li2O decomposition, and the built-in electric field accelerates the charge transport rate to improve the conductivity. The three-dimensional porous graphene framework effectively mitigates volume expansion during cycling and stabilizes the reactive interface of electrode materials. The results show that the NiO/SnO2@NG mixture has high reversible specific capacity (938.8 mA h g−1 after 450 cycles at 0.1 A g−1), superior multiplicity performance (374.5 mA h g−1 at 3.0 A g−1) and long cycle life (685.3 mA h g−1 after 1000 cycles at 0.5 A g−1). Thus, this design of introducing NiO to form heterostructures with SnO2 is directly related to enhancing the electrochemical performance of lithium-ion batteries (LIBs).
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANO
·
2020
·
IF 1.566
Ke Xu,Xiaosheng Yang,Dagao Sun,Xin Yang,Yumei Zhou,Wei Li,Qindan Yang,Xianjiong Yang,Rong Li,Jian Feng
LaFeO 3 /NiO modified g-C 3 N 4 nanosheets (L-N/CNS) were synthesized by a two-step method. HRTEM results showed that an intimate contact between LaFeO 3 , NiO and N-CNS was successfully established. Ninety percent of phenol was degraded within 120 min, and the hydrogen evolution rate of 171.2 μ mol h − 1 g − 1 was obtained over the L-N/CNS heterojunctions under the visible-light irradiation. It was higher than that of g-C 3 N 4 nanosheets, NiO modified g-C 3 N 4 and LaFeO 3 /g-C 3 N 4 . The ⋅ O 2 − radicals acted the crucial role in the photocatalytic degradation reaction. EIS, PL and time-resolved fluorescence spectra demonstrated that L-N/CNS possessed the highest charge separation efficiency. The intimate contact between LaFeO 3 , NiO and g-C 3 N 4 nanosheets promoted the separation and transfer of photo-induced electron–hole pairs and consequently prolonged the exciton lifetime, and implied more photo-induced electrons could be probably involved in the photocatalytic reactions on the surface of photocatalysts. Thus, the visible-light driven photocatalytic performances of L-N/CNS were effective. This work provided a feasible method to design and construct heterostructures for the exploitation of solar energy.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Jiajia Wang,Yuanyuan Liu,Zeyan Wang,Peng Wang,Zhaoke Zheng,Xiaoyan Qin,Xiaoyang Zhang,Ying Dai,Baibiao Huang
Enhancing the photocatalytic activity of NiO towards hydrogen generation (6 times) is achieved by phenyl phosphoric acid (PPA) surface modification. The photocatalytic activity can be further improved by changing PPA to 4-aminophenyl phosphonic acid (PPA-NH 2 ), about 10 times, suggesting the functional group plays an important role in improving the activity. A chemical bond (Ni O P) between NiO and organic phosphoric acid was proved by FT-IR spectra. XPS and LSV analysis suggested organic phosphonic acid modification increased the electron density of Ni, which promoted the transformation from Ni 2+ to Ni 0 . Mott-Schottky (M − S) measurement revealed that PPA-NH 2 modified NiO processed a larger the space charge layer thickness (d sc ), which enhanced ability towards H 2 evolution from dynamical aspect.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Engineering
·
2022
·
IF 12.834
Boyuan Xue,Qian Yang,Kaidong Xia,Zhihong Li,George Y. Chen,Dayi Zhang,Xiaohong Zhou
Heavy metals, notably Pb 2+ and Cu 2+ , are some of the most persistent contaminants found in groundwater. Frequent monitoring of these metals, which relies on efficient, sensitive, cost-effective, and reliable methods, is a necessity. We present a nanocomposite-based miniaturized electrode for the concurrent measurement of Pb 2+ and Cu 2+ by exploiting the electroanalytical technique of square wave voltammetry. We also propose a facile in situ hydrothermal calcination method to directly grow binder-free mesoporous NiO on a three-dimensional nickel foam, which is then electrochemically seeded with gold nanoparticles (AuNPs). The meticulous design of a low-barrier Ohmic contact between mesoporous NiO and AuNPs facilitates target-mediated nanochannel-confined electron transfer within mesoporous NiO. As a result, the heavy metals Pb 2+ (0.020 mg·L −1 detection limit; 2.0–16.0 mg·L −1 detection range) and Cu 2+ (0.013 mg·L −1 detection limit; 0.4–12.8 mg·L −1 detection range) can be detected simultaneously with high precision. Furthermore, other heavy metal ions and common interfering ions found in groundwater showed negligible impacts on the electrode’s performance, and the recovery rate of groundwater samples varied between 96.3% ± 2.1% and 109.4% ± 0.6%. The compactness, flexible shape, low power consumption, and ability to remotely operate our electrode pave the way for onsite detection of heavy metals in groundwater, thereby demonstrating the potential to revolutionize the field of environmental monitoring.
研究领域:
环境科学
·
分析化学
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Jian-Wei Luo,Jian-Dong Song,Wen-Zhi Jia,Zhi-Ying Pu,Ji-Qing Lu,Meng-Fei Luo
Catalytic dehydrofluorination of 1,1,1,3,3-pentafluoropropane to 1,3,3,3-tetrafluoropropene was performed on a series of fluorinated NiO/Cr 2 O 3 catalysts. The NiO/Cr 2 O 3 catalysts were more active than the Cr 2 O 3 because the new acid sites provided by NiF 2 had higher turnover frequencies (9.43 × 10 −3 − 12.08 × 10 −3 s −1 ) than those on the Cr 2 O 3 (4.55 × 10 −3 s −1 ). Also, the NiO/Cr 2 O 3 was more stable than the Cr 2 O 3 due to its lower density of surface acid sites, which alleviated the coke deposition on the catalyst as evidenced by the Raman spectroscopic results. The kinetic results revealed that the15NiO/Cr 2 O 3 had much lower activation energy (63.6 ± 4.5 kJ mol −1 ) than the Cr 2 O 3 (127.6 ± 3.8 kJ mol −1 ). Accordingly, different reaction pathways on the two catalysts were proposed, which involved the cleavage of the C F and C H bonds on the surface acid and base sites, respectively.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yingyue Wang,Jinyang Huang,Wansheng Tang,Mengying Long,Zongwei Zhang,Hongli Liu,Dongmin An
In this work, an uncomplicated solvothermal method was used to synthesize NiO-SnO 2 gas sensing materials derived from bimetallic MOFs. The influence of MOF derived NiO-SnO 2 with different amount of Ni on the gas sensing performance of triethylamine (TEA) was systematically evaluated. The results showed that the MOF derived 0.5 mol% NiO-SnO 2 based gas sensor exhibited the best gas sensing performance. The response to TEA gas of the sensor reached 124.5 to 50 ppm at 170 °C, which was 1.5 times that of SnO 2 sensor (83). Compared with SnO 2 sensor at 190 °C, its operating temperature was reduced by 20 °C. Moreover, the MOF derived 0.5 mol% NiO-SnO 2 sensor also performed outstanding selectivity towards TEA, with a response that is 3.1–49.8 times higher than other target gases. The MOF derived NiO-SnO 2 nanomaterials were also conducted X-ray photoelectron spectroscopy and UV–visible absorption spectra analysis. The results demonstrated that an increase in specific surface area, abundant oxygen vacancies, a decrease in forbidden bandwidth, and the formation of p-n heterojunctions were significant factors in improving the gas sensing performance of MOF derived NiO-SnO 2 nanomaterials.
研究领域:
材料科学
·
化学传感器
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2017
·
IF 10.614
Xuelin Zou,Zebao Rui,Hongbing Ji
An alumina-supported core–shell-structured NiO@PdO catalyst was prepared for lean CH4 combustion. NiO@PdO plays two roles in promoting the reaction. First, the enhanced NiO-PdO interfacial action accelerates the regular tetragonal PdO lattice construction, stabilizes the PdO particles, and suppresses the hydroxyl/water adsorption during the reaction. Second, the dispersion of shell PdO particles over core NiO improves PdO exposure and utilization efficiency. NiO@PdO/Al2O3 with a molar Ni/Pd ratio of 2/1 exhibits a (>)99% CH4 conversion and a good stability at 400 °C with a low 0.2 wt % Pd loading amount, which is among the best of the state-of-the-art Pd-based catalysts with respect to turnover frequency, Pd utilization efficiency, and Ni addition amount. Such interface-promoted core–shell-structured catalyst design strategy is inspiring for improving noble metal utilization efficiency in CH4 oxidation and other related reaction systems.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 32
·期 21
·25656-25667
·
IF 2.22
Wang Huiya,Wu Xiaofen,Wang Qiuyue,Chen Siyi,Chen Gang,Dong Chengjun,Guan Hongtao
Efficient microwave absorbing materials have been drawn extensive attention. Herein, biomass porous carbon (BPC) from pine pollen has been obtained through KOH carbonization. In order to tune the microwave absorption, NiO has been composited with the as-prepared BPC with different contents. Despite the high specific surface area for the BPC activated at 600 °C, it exhibits poor microwave absorption properties as pure NiO. In contrast, the BPC/NiO composite with proper nickel precursor (0.1:1.0) has the maximum reflection loss ( RL ) of − 52.6 dB at 10.0 GHz and the effective absorption bandwidth ( RL < − 10 dB) reaches up to 4.9 GHz (from 7.8 to 12.7 GHz) when the absorber thickness is 3 mm. Three-dimensional porous architecture, interfacial polarization and their related relaxation from defects and interfaces cooperatively favor the impedance matching and strong EM wave attenuation capacities, which brings about multiple absorption mechanisms of the microwave. The present study not only provides a facile route to prepare porous carbon, but also sheds light on a new strategy in constructing BPC/NiO composites for excellent microwave absorption.
研究领域:
材料科学
·
电磁学
✓ 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）