APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Xuecheng Hu,Guohong Wang,Juan Wang,Zifei Hu,Yaorong Su
Herein, a step-scheme heterostructure photocatalyst formed by macroporous NiO foams and BiOI microspheres is successfully fabricated. The as-obtained NiO/BiOI heterostructure can be employed as an effective photocatalyst under solar light for the RhB degradation, and the optimum rate constant of 57.2 × 10 −3 min −1 is achieved with an optimal mass ratio of NiO to BiOI (10%) in the composite, which is 1.7 and 8.0 times as high as that of singular BiOI and NiO, respectively. The increased light utilization of the macroporous/microspheric hierarchical system and the formation of high quality heterojunction interface between NiO and BiOI are responsible for the improvement in photocatalytic activity. In addition, the underlying step-scheme heterojunction mechanism for efficient charge transportation and separation is also proposed. Our present work demonstrates that the step-scheme heterojunction is a feasible way to obtain high efficiently photocatalysts and might inspire some new strategies in the area of photocatalysis.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 9
·1250
·
IF 4.034
Hongcheng Liu,Feipeng Wang,Kelin Hu,Bin Zhang,Li He,Qu Zhou
In this paper, the porous NiO/SnO2nanofibers were synthesized via the electrospinning method along with the carbonization process. The characterization results show that the pristine SnO2-based nanofibers can form porous structure with different grain size by carbonization. The hydrogen gas-sensing investigations indicate that the NiO/SnO2sensor exhibits more prominent sensing properties than those of pure SnO2sensor devices. Such enhanced performance is mainly attributed to the porous nanostructure, which can provide large active adsorption sites for surface reaction. Moreover, the existence of p-n heterojunctions between NiO and SnO2also plays a key role in enhancing gas-sensing performances. Finally, the H2sensing mechanism based on the NiO/SnO2nanocomposite was proposed for developing high-performance gas sensor devices.Keywords:NiO/SnO2nanofibers;p-n heterojunctions;porous nanostructure;H2sensor
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
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2019
·
IF 0
Ke Chu,Ya-ping Liu,Jing Wang,Hu Zhang
Current artificial NH3 synthesis relies heavily on the Haber–Bosch process that involves enormous energy consumption and huge CO2 emission. The electrochemical N2 reduction reaction (NRR) offers an eco-friendly and sustainable alternative but demands cost-effective and efficient NRR electrocatalysts. Herein, NiO nanodots (∼2 nm) supported on graphene (NiO/G) were developed as a high-performance NRR electrocatalyst at ambient conditions. Electrochemical tests indicated that the NiO/G exhibited a high NH3 yield (18.6 μg h–1 mg–1) and Faradaic efficiency (7.8%) at −0.7 V vs reversible hydrogen electrode, outperforming the most reported NRR electrocatalysts. Experimental and density functional theory (DFT) results revealed that NiO was the dominating active center, and nanodot structure enabled the NiO to expose more active sites. DFT results further demonstrated that the distal associative route was the preferable NRR pathway with *N2 → *NNH being the rate-determining step.
研究领域:
材料科学
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电催化
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能源与环境科学
✓ 已验证
产品关联
DOI
Solar RRL
·
2021
·Vol. 5
·期 12
·2100703
·
IF 8.582
Junxiang Xiang,Tingshi Zhang,Ruodan Cao,Mingxiong Lin,Bixia Yang,Yonglin Wen,Zanyong Zhuang,Yan Yu
In designing highly efficient CO 2 reduction reaction (CRR) photocatalysts with excellent selectivity and efficiency, a key limitation is the poor understanding on the mechanism response of the active sites of catalysts to CRR selectivity and activity. Herein, it is revealed how the concentration of point defect affects the CRR selectivity and activity of catalysts. Quasi-2D NiO nanosheets (NSs) that are composed of NiO nanoparticles (NPs), and finely tuned the oxygen vacancies (OVs) concentration of the NSs by regulating the grain size (≈5–25 nm) of NPs are created. The NiO with moderate OVs concentration has the highest photocatalytic CRR efficiency and selectivity ( V CO = 17.2 μmol h −1 , 98.3%), outperforming other prepared NiO catalysts and reported Ni-based photocatalysts. Density functional theory calculation associated with the CO 2 temperature-programmed desorption confirms that the moderate OVs concentration enables strong CO 2 binding to promote CO 2 adsorption and activation and allows efficient charge transfer. In contrast, excessive OVs reduce the CO 2 binding affinity and restrain charge mobility, both detrimental to the CRR performance.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2020
·
IF 5.006
Xiao Chen,Jianyu Li,Yue Wang,Ying Zhou,Qiulian Zhu,Hanfeng Lu
Metal-based monolithic catalysts have excellent electrical and thermal conductivity, impact resistance, ductility, and mechanical properties. Thus, they have a broader application prospect than ceramic-based monolithic catalysts. In this work, high-dispersion Pd nanoparticle dispersion liquid was synthesized by using the solvothermal method. Moreover, nickel-foam-supported Pd/NiO (Pd/NiO/Ni foam) monolithic catalyst with good catalytic combustion performance was prepared successfully by simply spraying the dispersion liquid on the surface of Ni foam, which was oxidized at high temperature to grow NiO film. A novel electric heating catalytic combustion reactor with fast response and safety was constructed by nesting Pd/NiO/Ni foam with an insulated heating rod. Notably, even at the high space velocity of 50,000 h −1 , the constructed reactor can completely degrade 2500 ppm of toluene at 230 ℃ and exhibits good catalytic activity for hydrocarbons and oxygen-containing and heteroatom-containing organic compounds.
研究领域:
催化
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Weiwei Mao,Bin Cai,Zhizhen Ye,Jingyun Huang
A glucose oxidase (GOx) based p-NiO/n-Bi 4 Ti 3 O 12 sandwich heterojunction was fabricated and explored as a glucose electrochemical sensor. The constructed GOx/p-NiO/n-Bi 4 Ti 3 O 12 sandwich structure effectively prevents the leakage of GOx. Dandelion-like Bi 4 Ti 3 O 12 nanowires were directly grown on the titanium foil substrates, and dense NiO nanoparticles were deposited by employing pulsed laser deposition at room temperature. Amperometric measurements towards glucose were carried out, and efficient direct electron transfer was successfully achieved. The enzyme biosensor showed a linear range from 20 μM to 3.55 mM (R = 0.999) with an ultrahigh sensitivity of 215 μA mM −1 cm −2 , response time within 2 s, low detection limit of 1.26 μM (S/N = 3) and high specificity. The apparent Michaelis-Menten constant (Km app) was estimated to be 0.22 mM. Intercrossed nanowires and interconnected pores favor the electrons transfer and the massive GOx loading. Binder-free feature leads to a seamless connection between Bi 4 Ti 3 O 12 nanowires and the substrate. Co-catalysis of GOx and p-NiO/n-Bi 4 Ti 3 O 12 heterojunction plays a synergetic role in gaining performance boosts. The GOx based p-NiO/n-Bi 4 Ti 3 O 12 heterojunction biosensor remedies the limitation of enzyme-based glucose sensor and be potentially applied in practice.
研究领域:
生物医学工程
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材料科学
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分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Xingang Kong,Fangchao Lv,Hao Zhang,Fan Yu,Yong Wang,Lixiong Yin,Jianfeng Huang,Qi Feng
Improving the efficiency of photocatalytic water splitting hydrogen production of iron-containing metal oxide photocatalysts is still a huge challenge. Herein, the new application of K 2 Fe 4 O 7 for photocatalytic hydrogen production was proposed, and its photocatalytic performance was studied. Moreover, NiO was loaded on the surface of the K 2 Fe 4 O 7 , and improved the photocatalytic performance of K 2 Fe 4 O 7 . To understand the reason for the performance improvement, electrochemical impedance spectra, Surface photovoltage (SPV) and Transient photovoltage (TPV) were used to investigate the photogenerated carrier transportation mechanism of the samples. The result shows that the excellent photocatalytic performance of the samples was mainly due to the photogenerated electrons of K 2 Fe 4 O 7 transferred to NiO, which enhanced the separation and transport of photogenerated carriers.
研究领域:
材料科学
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化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 7
·077514
·
IF 3.1
Tengteng Zhao,Chaoyu Wang,Lei Dai,Weiwei Meng,Yongguang Liu,Yuehua Li,Ling Wang
NO2 is an important pollutant of automobile engines and industrial fuels, making it important to quantitatively monitor and control. An amperometric-type NO2 gas sensor was fabricated using yttria-stabilized zirconia (YSZ) electrolyte with a bi-layered structure and La0.7Sr0.3MnO3−δ-xNiO (LSMO-xNiO, x = 0–0.75) composite sensing electrode (SE) prepared by impregnation method in combination with self-demixing. The samples were characterized using SEM, XRD, and XPS, and their performance as sensors was tested. LSMO-xNiO composite SE particles were formed by de-mixing in the process of treating the precursor at high temperatures and are uniformly dispersed in the YSZ porous backbone. With the increase of NiO content, the SE particles become significantly large. At 450 °C–600 °C, the response currents at a fixed potential have a linear relationship with the NO2 concentrations at 25–700 ppm. Combining stability and sensitivity, the voltage was fixed to −0.25 V. The introduction of NiO into the LSMO sensing electrode effectively improves the performance of the sensor. The sensor based on LSMO-0.5NiO has the highest sensitivity (0.0405 μA/ppm) at 550 °C. Simultaneously, the sensor exhibits good anti-interference ability for CH4, CO2, O2, and NO, but has obvious cross-sensitivity to H2 and NH3. In addition, the response current of the sensor change with the increase of RH.
研究领域:
材料科学
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环境监测
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传感器技术
✓ 已验证
DOI
高影响因子
MOLECULES
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2020
·Vol. 25
·期 5
·1097
·
IF 3.267
Run-Kun Zhang,Die Wang,Yan-Jun Wu,Yi-Han Hu,Jian-Yu Chen,Jin-Can He,Jing-Xin Wang
Sensitive and selective detection of harmful gas is an important task in environmental monitoring. In this work, a gas sensor based on cataluminescence (CTL) for detection of acetaldehyde was designed by using nano-NiO as the sensing material. The sensor shows sensitive response to acetaldehyde at a relatively low working temperature of 200 °C. The linear range of CTL intensity versus acetaldehyde concentration is 0.02–2.5 mg/L, with a limit of detection of 0.006 mg/L at a signal-to-noise ratio of three. Mechanism study shows that electronically excited CO2is the excited intermediate for CTL emission during the catalytic oxidation of acetaldehyde on the NiO surface. The proposed sensor has promising application in monitoring acetaldehyde in residential buildings and in the workplace.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Hao Sun,Zhigang Xie,Jun Yang,Taiping Xie,Zixuan Zhang,Bingzhao Cui,Yanling Zhao,Meiying Huang
Bismuth chloride oxide is a potential photocatalyst with a unique structure and visible light responsive properties. This paper explores the effects of different ratios of NiO on the photocatalytic performance of NiO/BiOCl heterojunction photocatalysts, which are prepared by impregnation and annealing. The experimental results demonstrate that the construction of NiO/BiOCl heterojunction enhances the visible light response and significantly decreases the compounding efficiency of the photogenerated carriers. The degradation of tetracycline by 6% NiO/BiOCl was almost complete within approximately 30 min, which is about 30% faster than that of unmodified BiOCl. The cycling performance is excellent and the preparation process is simple, making it highly applicable.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Yayun Zheng,Yunrui Tian,Huaiping Zhang,Qingping Guo,Jujie Luo
Electrode materials with graphite flake layer structure decorated with nickel oxide and nickel sulfide nanoparticles (NiO/Ni 3 S 2 ) have been prepared by one-pot microwave method. When NiO/Ni 3 S 2 @graphite synthesized by microwave is compared with NiO@graphite electrode, the former obtains a high capacitance of 768 F g −1 at 1 A g −1 , exceeding 72% (446 F g −1 at 1 A g −1 ) of the latter. After 1000 cycles of the NiO/Ni 3 S 2 @graphite electrode, the specific capacitance remained at 692 F g −1 (at 1 A g −1 ) with a capacitance retention of 90%. Furthermore, NiO/Ni 3 S 2 @graphite and active carbon electrodes could be assembled into asymmetric supercapacitor (ASC), which exhibited a specific capacitance of 68.5 F g −1 at 1 A g −1 in 6 M KOH solution. The NiO/Ni 3 S 2 @graphite//AC ASC also showed a relatively high energy density of 28.86 Wh kg −1 , maximum power density of 0.77 kW kg −1 , and exceptional cycling stability (80% retention after 2000 cycles).
研究领域:
材料科学
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能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Processes & Impacts
·
2014
·Vol. 16
·期 6
·1462-1468
·
IF 0
Lin Duan,Lingfang Li,Zhu Xu,Wei Chen
Nano-sized nickel oxide (nano-NiO) is a new nanomaterial that has shown great promise in many areas of application. Understanding its environmental fate and effects is critical for minimizing the potential environmental implications of this new material due to incidental and accidental releases in the future. In this study, we observed strong adsorption of tetracycline to nano-NiO and found that the adsorption affinity can be further enhanced by Cu(II) ions – the observed distribution coefficient (Kd) values are 103.1 to 104.2 L kg−1 in the absence of Cu(II) and 103.0 to 105.5 L kg−1 in the presence of Cu(II); such adsorption affinities are even comparable to those of tetracycline to carbonaceous materials. The strong adsorptive affinities of nano-NiO for tetracycline are likely attributable to several mechanisms, including surface complexation, cation exchange, and electrostatic attraction. As a strong complexing agent, Cu(II) can significantly enhance adsorption of tetracycline by serving as a bridging agent between tetracycline and nano-NiO. The findings of this study have important implications for the risk assessment of engineered nanomaterials – in aquatic environments nano-NiO (and likely other metal oxide nanomaterials) can strongly adsorb tetracycline antibiotics, resulting in the changes of environmental risks of the metal oxide nanomaterials and/or bioavailability of the adsorbed contaminants.
研究领域:
环境科学
·
纳米技术
✓ 已验证
DOI
危险品化学品经营许可证（带存储）