ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yanying Wang,Zhaoyi Zhang,Xin Liu,Fang Ding,Ping Zou,Xianxiang Wang,Qingbiao Zhao,Hanbing Rao
We developed a hydrothermal synthesis and high temperature calcination method to synthesize the metal–organic framework (MOF)-derived NiCo2O4/NiO and NiCo2O4/NiO-rGO. These composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Brunner–Emmet–Teller measurements. This work combines excellent catalytic efficiency of the transition metal with large specific surface area and large number of pores of the MOF. Consequently, catalysts for oxygen evolution with high efficiency and low cost were obtained. Both materials show lower overpotential at 430 and 350 mV, respectively, under 10 mA·cm–2. The Tafel slopes are 49 and 66 mV·dec–1, respectively, with very small performance attenuation for long-term catalytic reaction. Therefore, the catalysts reported herein possess great potential for application in oxygen evolution reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2022
·
IF 4.11
Chaofei Bai,Shengnan Li,Desheng Yang,Jie Li,Guoping Li,Yunjun Luo
Nanothermite has attracted much attention because of the larger interface contact area between oxidizer and fuel. Usually, one of the important ways to improve the reaction and combustion performance is to make fuel contact with oxidizer more closely, so the preparation of large specific surface area oxidizer is a very effective method. Therefore, tremella NiO were prepared in ethylene glycol using nickel acetate as precursor by means of mediated self-assembly and calcination process, with a specific surface area of 310.69m 2 /g. which was an oxidant to prepare Al@NiO nanothermite by ultrasonic mixing. The thermal properties , combustion performance of Al@NiO were analyzed by differential scanning calorimetry and high-speed camera, and compared with Al/NiO nanothermite prepared by using commercially purchased Al and NiO as raw materials. Compared with Al/NiO, the heat release of Al@NiO increased by 268J/g, the activation energy decreased by 88 kJ/mol, and the combustion flame was brighter, the combustion time was shorter, and the energy release was faster. It was also found that stoichiometric ratio has significant effects on the energy output of nanothermite, and the fuel-rich formula has more prominent energy characteristics. The alcohol-thermal synthesis method adopted in this paper is also expected to be applied to other nanothermite systems.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2015
·
IF 1.998
Xinying Qi,Ge Su,Guoshuai Bo,Lixin Cao,Wei Liu
NiO and NiO/TiO 2 films were prepared on fluorine doped tin oxide (FTO) coated glass substrates by electrochemial deposition and sol–gel method. Choline chloride–urea ionic liquid was used as electrodeposition media. The composition, morphology and microstructure of the films were characterized by a scanning electron microscope (SEM) and X-ray diffractometer (XRD). Cyclic voltammetry (CV), cycle life, response time and transmittance of the films were measured and compared with each other. Photocatalytic activity of the NiO/TiO 2 film was examined and explained through the degradation of methyl orange. Results show that, after 8000 cycles, both NiO and NiO/TiO 2 films still maintain their good electrochromic property and stability. The NiO/TiO 2 film not only performs excellent electrochromic function but also displays a certain photocatalytic activity. And interestingly, the NiO/TiO 2 film at bleached and colored states demonstrates different photocatalytic activities, which are higher than that at as-prepared state.
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
Catalysts
·
2019
·Vol. 9
·期 6
·561
·
IF 3.444
Bozhi Yang,Xuefeng Bai,Jiaxuan Wang,Minghao Fang,Xiaowen Wu,Yan’gai Liu,Zhaohui Huang,Cheng-Yen Lao,Xin Min
Photocatalytic degradation of pollutants is one of the cleanest technologies for environmental remediation. Herein, we prepared NiO/NiTiO3heterostructure nanofiber (200 nm) films by electrospinning and high temperature heat treatment, using nickel acetate and tetrabutyltitanate as nickel and titanium sources, respectively. The NiO/NiTiO3heterostructure has advantages of good photodegradation rate constant and stability. By controlling the temperature, we can optimize the phase composition of these nanofibers for better photocatalytic performance. Based on our findings of the Rhodamine B degradation results, the best performance was obtained with 10% NiO and 90% NiTiO3; 92.9% of the Rhodamine B (5 mg/L) was degraded after reaction under full spectrum irradiation for 60 min. More importantly, the repeating test showed that these nanofiber films can remain active and stable after multiple cycles. The mechanisms of the photocatalysis reactions were also discussed. This demonstration provides a guideline in designing a new photocatalyst that we hope will serve the environmental needs for this and the coming century.Keywords:NiO/NiTiO3;nanofiber;electrospinning;photocatalyst
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
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Weizhao Hong,Yansong Zhou,Chade Lv,Zhonghui Han,Gang Chen
Quantum dots (QDs) have great potential to build heterojunctions for efficient photocatalytic hydrogen production because of the quantum size effects, whereas they are limited by the rigorous preparation. Herein, we report a facile sacrificial coating strategy toward the construction of the NiO QDs/TiO2 heterojunction. Shorter transmission distance of carriers and higher crystallinity between NiO QDs and TiO2 substrate are achieved to minimize the recombination of photoinduced electrons and holes. As a result, excellent performance of 1.35 mmol h–1 g–1 over the NiO QDs/TiO2 sample is achieved, which is 37 times higher than that of NiO/TiO2 and 56 times higher than that of pure TiO2. Furthermore, this is one of the best performances reported in heterojunctions made of NiO and TiO2.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Liping Gao,Hao Ran Dong,Zhe Lin Liu,Jincheng Cao,Junhai Wang,Xueli Liu,Yuping Chen
As a carcinogen, low concentration and high sensitivity detection of formaldehyde is crucial. NiO sensitized porous ZnSnO3 nanocubes were synthesized through a water bath coprecipitation process followed by subsequent calcination for formaldehyde vapor detection. NiO sensitized porous ZnSnO3 nanocubes exhibit a uniform size distribution of approximately 100 nm. The addition of NiO increases the oxygen vacancy concentration while suppressing electron–hole recombination processes. Operating at 180 °C, gas sensors based on NiO sensitized porous ZnSnO3 nanocubes exhibit a significant response to 50 ppm formaldehyde vapor. The 7% NiO/ZnSnO3 sensor demonstrates a higher sensitivity of 60.5 compared to other ratios. When detecting formaldehyde at a concentration of 1 ppm, the 7% NiO/ZnSnO3 sensor exhibits a sensitivity of 15.9, which indicates its low detection limit. Additionally, it demonstrates a strong linear response to formaldehyde concentration variations, along with excellent selectivity and good stability to 50 ppm formaldehyde. The excellent gas sensitivity of the 7% NiO/ZnSnO3 nanocubes sensor is attributed to the unique p–n heterojunction and abundant oxygen vacancies.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 4
·258
·
IF 4.2
Baoyu Huang,Xinwei Tong,Xiangpeng Zhang,Qiuxia Feng,Marina N. Rumyantseva,Jai Prakash,Xiaogan Li
In this work, MXene/NiO-composite-based formaldehyde (HCHO) sensing materials were successfully synthesized by an in situ precipitation method. The heterostructures between the MXene and NiO nanoparticles were verified by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The HCHO sensing performance of the MXene/NiO-based chemiresistive-type sensors was investigated. Compared to pure MXene and NiO materials, the sensing performance of the MXene/NiO-P2-based sensor to HCHO gas at room temperature was significantly enhanced by the formation of MXene/NiO heterojunctions. The response of the MXene/NiO-P2 sensor to 50 ppm HCHO gas was 8.8, which was much higher than that of the pure MXene and NiO. At room temperature, the detectable HCHO concentration of the MXene/NiO-P2-based sensor was 1 ppm, and the response and recovery time to 2 ppm HCHO was 279 s and 346 s, respectively. The MXene/NiO-P2 sensor also exhibited a good selectivity and a long-term stability to HCHO gas for 56 days. The in situ Fourier transform infrared (FTIR) spectra of the MXene/NiO-P2 sensor, when exposed to HCHO gas at different times, were investigated to verify the adsorption reaction products of HCHO molecules.Keywords:chemiresistive-type formaldehyde sensor;MXene/NiO;heterojunctions;room temperature
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
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Mengzhu Liu,Yongpeng Wang,Pengchong Li,Zhiqiang Cheng,Yongqiang Zhang,Mingyue Zhang,Meijuan Hu,Junfeng Li
NiO with multilayer structure was prepared by impregnating electrospun polylactic acid (PLA) nanofibrous webs with nickel acetate solution and subsequent calcination. From SEM images, it can be observed that the structures of NiO products from surface to center were nanogrooves inlaid film, hollow pores and honeycomb-like nanofibers with nanogrooves, successively. The formation mechanisms were studied in detail by TGA and DSC. FT-IR and XRD measurements demonstrated that the product was highly pure NiO with cubic structure. The sensitivity of the NiO products to formaldehyde was investigated. As a result, the multilayer NiO exhibited much higher sensing signal than NiO powders. This indicated that the prepared multilayer NiO could be used as a candidate to fabricate formaldehyde sensors.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiangjia Liu,Jin Li
In this study, a ZnO/NiS@NiO/rGO (ZNNG) composite was characterized using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and scanning electron microscopy (SEM). Compared with simple ZnO, ZNNG exhibited stronger green emissions, but no ultraviolet (UV) emission peak was observed. Through a comprehensive analysis of ultraviolet–visible (UV–vis) absorption spectra, Mott Schottky (MS) plots, electron paramagnetic resonance (EPR) spectra, and X-ray photoelectron spectroscopy (XPS) results, it was proved that the stable green emissions of ZnO and its composites originated from the quenching of electrons between Zn interstitial ( Zn i ) and surface oxygen defects. The introduction of NiS@NiO caused the conduction band (CB) and valence band (VB) of ZnO to change to lower energy states, effectively increasing the absorption intensities of ZnO in the visible light, while introducing numerous oxygen-related defects on the surface of ZnO. Further addition of rGO effectively promoted the migration of electrons from the CB to the Fermi energy (E f ). These effects effectively increased the green emission of ZnO and reduced the UV emission. Finally, a proper mechanism for the near-zero band gap NiS@NiO/rGO that can significantly enhance the green emission of ZnO was proposed.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 6
·2435
·
IF 4.6
Fulin Wang,Zhenzhen Yu,Kaiyang Shi,Xiangwei Li,Kangqiang Lu,Weiya Huang,Changlin Yu,Kai Yang
The green and clean sunlight-driven catalytic conversion of CO2into high-value-added chemicals can simultaneously solve the greenhouse effect and energy problems. The controllable preparation of semiconductor catalyst materials and the study of refined structures are of great significance for the in-depth understanding of solar-energy-conversion technology. In this study, we prepared nitrogen-doped NiO semiconductors using a one-pot molten-salt method. The research shows that the molten-salt system made NiO change from p-type to n-type. In addition, nitrogen doping enhanced the adsorption of CO2on NiO and increased the separation of photogenerated carriers on the NiO. It synergistically optimized the CO2-reduction system and achieved highly active and selective CO2photoreduction. The CO yield on the optimal nitrogen-doped photocatalyst was 235 μmol·g−1·h−1(selectivity 98%), which was 16.8 times that of the p-type NiO and 2.4 times that of the n-type NiO. This can be attributed to the fact that the nitrogen doping enhanced the oxygen vacancies of the NiOs and their ability to adsorb and activate CO2molecules. Photoelectrochemical characterization also confirmed that the nitrogen-doped NiO had excellent electron -transfer and separation properties. This study provides a reference for improving NiO-based semiconductors for photocatalytic CO2reduction.Keywords:NiO;nitrogen doping;photocatalysis;reduction of CO2
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 29
·期 43
·435704
·
IF 3.404
Yangxiu Liu,Jin Jia,Yan Vivian Li,Jing Hao,Kai Pan
In recent years, Janus materials have become a research hotspot in the field of materials science; however, fabricating inorganic Janus-like nanofibers (NFs) is still a challenge. Herein, we report novel ZnO/NiO Janus-like NFs with efficient photocatalytic performance via an electrospinning method followed by calcination treatment. The morphology, structure, chemical composition and crystallinity of ZnO/NiO Janus-like NFs were studied in detail via SEM, TEM, HRTEM, EDS, FT-IR, XPS and XRD, indicating that the NFs had a perfect Janus-like structure composed of ZnO and NiO. A series of photocatalytic experiments were carried out in aqueous organic dye solutions under 365 nm UV radiation for 1 h, with the degradation rate of malachite green able to reach 96%, proving that the NFs have great potential in the field of organic dye degradation. Furthermore, a reasonable catalytic mechanism for the ZnO/NiO Janus-like NFs was proposed, which was discussed from the view of electron–hole pairs and p-n junctions. In short, the method in our work is expected to become a new way of effectively preparing functional inorganic Janus-like NFs.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Qiongya Jin,Ye Yang,Chen Yuan,Jinchang Lei,Weijie Song
The polymer electrolyte (PE) is the key component for a typical laminated WO 3 –NiO electrochromic device (ECD). However, the electrochemical fragility usually makes it be easily damaged by the parasitic side oxidation reaction from the Ni 4+ at nickel oxide to generate gas bubbles within a short term running. Herein, we disclose a viable strategy through adopting WO 3 covered NiO as counter electrode to address this problem. In this investigated case, to render the ECD with neutral color, our previously-developed Nb doped WO 3 , Li and Si co-doped NiO, and PVB based electrolyte are employed as the basic constituents. The results demonstrate that the sputtered WO 3 cover layer offers multiple advantages, involving forming an ultra-thin blocking layer to avoid a direct contact between nickel oxide and electrolyte, improving the film quality by removing the defects and achieving an effective W doping in nickel oxide matrix to ensure a highly cyclic stability, decreasing the Li + transport impedance to realize a rapid response, enhancing the device critical current density to 0.45 mA cm −2 to conduct a trade-off between response rate and lifetime, and constructing a homogeneous electric field to realize an uniform coloring or bleaching over a larger 100 cm 2 sized ECD.
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）