APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Wenhao Zhang,Yuanhao Tang,Liangmin Yu,Xin-Yao Yu
Nickel-based metal oxides/hydroxides are promising electrocatalysts for oxygen evolution reaction. However, their electrocatalytic activity for hydrogen evolution reaction (HER) is very poor. Herein, taking Mo-incorporated nickel hydroxide (Mo-Ni(OH) 2 ) as an example, a facile, time-efficient, and low-temperature H 2 /N 2 plasma activation strategy is developed to activate the HER performance by constructing heterostructure. This kind of heterostructure is composed of metal, metal alloy, metal nitride , and oxygen vacancy-riched metal hydroxide with more exposed catalytically active sites, enhanced mass activity, and accelerated electron transport. The optimized plasma-activated Mo-Ni(OH) 2 (P-Mo-Ni(OH) 2 ) manifests superior HER performance to pristine Mo-Ni(OH) 2 and even comparable to the benchmark Pt/C catalyst in alkaline solution. Moreover, when assembling a two-electrode urea-assisted water electrolysis system by using P-Mo-Ni(OH) 2 as both cathode and anode, the assembled cell only need a small voltage of 1.36 V to achieve a current density of 10 mA cm −2 and exhibits extremely stable catalytic performance up to 1000 h.
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CELLULAR & MOLECULAR BIOLOGY LETTERS
·
2017
·Vol. 22
·期 1
·1-11
·
IF 1.26
Li Xican,Xie Hong,Jiang Qian,Wei Gang,Lin Lishan,Li Changying,Ou Xingmei,Yang Lichan,Xie Yulu,Fu Zhen,Liu Yamei,Chen Dongfeng
The natural dihydroflavonol (+) taxifolin was investigated for its protective effect on Fenton reagent-treated bone marrow-derived mesenchymal stem cells (bmMSCs). Various antioxidant assays were used to determine the possible mechanism. These included •OH-scavenging, 2-phenyl-4, 4, 5, 5-tetramethylimidazoline-1-oxyl-3-oxide radical-scavenging (PTIO•-scavenging), 1, 1-diphenyl-2-picryl-hydrazl radical-scavenging (DPPH•-scavenging), 2, 2′-azino-bis (3-ethylbenzo-thiazoline-6-sulfonic acid) radical-scavenging (ABTS+•-scavenging), Fe3+-reducing, and Cu2+-reducing assays. The Fe2+-binding reaction was also investigated using UV-Vis spectra. The results revealed that cell viability was fully restored, even increasing to 142.9 ± 9.3% after treatment with (+) taxifolin. In the antioxidant assays, (+) taxifolin was observed to efficiently scavenge •OH, DPPH• and ABTS+• radicals, and to increase the relative Cu2+- and Fe3+-reducing levels. In the PTIO•-scavenging assay, its IC50 values varied with pH. In the Fe2+-binding reaction, (+) taxifolin was found to yield a green solution with two UV-Vis absorbance peaks: λmax = 433 nm (ε =5.2 × 102 L mol−1 cm −1) and λmax = 721 nm (ε = 5.1 × 102 L mol−1 cm −1). These results indicate that (+) taxifolin can act as an effective •OH-scavenger, protecting bmMSCs from •OH-induced damage. Its •OH-scavenging action consists of direct and indirect antioxidant effects. Direct antioxidation occurs via multiple pathways, including ET, PCET or HAT. Indirect antioxidation involves binding to Fe2+.
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Materials Today Chemistry
·
2025
·
IF 6.7
Ping Liang,Yihao Zheng,Xiaoyan He,Xiaoli Peng,Weilan Huang,Beichen Ying,Xuejie Zhang,Chaofan Hu,Bingfu Lei,Yingliang Liu,Jianle Zhuang
Carbon dot (CD)-based room-temperature phosphorescent (RTP) materials have aroused wide attention owing to their excellent photophysical properties. However, the reports of RTP CDs in information encryption and erasure applications are limited. Herein, a new-type of CD-based RTP material is constructed by incorporating the fluorescent CDs into yttrium hydroxide matrix (CDs@Y(OH) 3 ). For the first time, the Y(OH) 3 as a rigid matrix is used to stabilize the triplet state of the CDs and protect the CDs from oxygen. Furthermore, the intramolecular motions of the CDs are limited, due to the space confinement of the Y(OH) 3 matrix and the formation of hydrogen bonds, thus effectively suppressing the non-radiative transition of triplet excitons and promoting phosphorescence emission. Based on superior optical performance, the CDs@Y(OH) 3 composites are successfully applied in information encryption, and decryption. In addition, by destroying the Y(OH) 3 matrix with acetic acid spray, the phosphorescence is invalidated and the information is erased after decryption. This finding not only provides a new strategy for the preparation of CD-based RTP materials but also reveals the great potential of CDs in information security and protection.
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ACS Catalysis
·
2024
·
IF 11.3
Yuexiang Li,Junliang Liu,Shuqi Li,Shaoqin Peng
Hydrogen production through electrochemical water splitting (EWS) presents a viable solution for addressing the fossil energy crisis. However, the commercial viability of this approach is impeded by the sluggish kinetics of the oxygen evolution reaction (OER). It is urgently needed to develop efficient, stable, and cost-effective OER electrocatalysts. Herein, we comprehensively design and investigate a phosphate ion and Fe3+ codecorating Ni(OH)2/NiOOH electrocatalyst (Pi-Fe:NiOH) for OER. This codecoration induces multiple synergistic effects, which include an increase in the interlayer water content for the internal OER, altering the OER mechanism, facilitating proton transport across the layers, and improving the stability of Pi-Fe:NiOH. Consequently, Pi-Fe:NiOH exhibits a high OER activity with overpotentials of 118 ± 1 and 222 ± 4 mV at current densities of 10 and 100 mA cm–2, respectively. More impressively, it maintains stable operation at a high current density of around 300 mA cm–2 for at least 500 h, much better than the Ni(OH)2/NiOOH electrocatalyst (NiOH) for less than 6 h at a current density below 200 mA cm–2. These findings offer insights for the design of anion–cation codoped hydroxide eletrocatalysts, paving a way for the development of efficient and stable OER electrocatalysts.
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NEW JOURNAL OF CHEMISTRY
·
2012
·Vol. 36
·期 6
·1335-1338
·
IF 2.605
Sa Huang,Jianhua Liu,Di Liu,Qinghai Yuan
We report the facile and scalable synthesis of a highly monodispersed inorganic nanostructure based on well-designed Gd(OH)3 nanorods. X-Ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), as well as energy-dispersive spectroscopy (EDS) were applied to characterize the samples, indicating that the nanomaterials with an average length of 100 nm and an average diameter of 15 nm showed a typical hexagonal phase. Biocompatibility tests were performed from in vitro cell experiments to in vivo long-term histological assessment, indicating that the Gd(OH)3 nanorods were promising for further bio-related application. Owing to the excellent paramagnetic behavior, we further investigated the capability of the nanorods as MRI contrast agent. Compared with the conventional Gd–DTPA complex, the well-designed Gd(OH)3 nanorods present a higher T1 relaxation rate, showing more potential for biomedicine applications.
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Nanoscale
·
2014
·Vol. 6
·期 13
·7424-7429
·
IF 6.739
Beibei Zhan,Changbing Liu,Huaping Chen,Huaxia Shi,Lianhui Wang,Peng Chen,Wei Huang,Xiaochen Dong
Three-dimensional graphene foam (3DGF) is a superior sensing material because of its high conductivity, large specific surface area and wide electrochemical potential windows. In this work, hexagonal Ni(OH)2 nanosheets are deposited on the surface of chemical vapor deposition-grown 3DGF through a facial hydrothermal process without any auxiliary reagents. The morphology and structure of the composite are characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Raman spectroscopy, and X-ray diffraction (XRD). Based on the Ni(OH)2/3DGF composite, a free-standing electrochemical electrode is fabricated. Being employed as a nonenzymatic glucose detection electrochemical electrode, it exhibits a high sensitivity (∼2.65 mA mM−1 cm−2), low detection limit (0.34 μM) and excellent selectivity with a linear response from 1 μM to 1.17 mM. The excellent sensing properties of the Ni(OH)2/3DGF electrode may be attributed to the synergistic effect of the high electrocatalytic activity of Ni(OH)2 nanosheets and the high conductivity and large surface area of 3DGF.
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MATERIALS LETTERS
·
2014
·
IF 2.269
Jing-He Yang,Chao Wang,Duo Yang,Xingyun Li,Peng Shang,Yamin Li,Ding Ma
The boron-doped α-Ni(OH) 2 nanoflowers (B-α-Ni(OH) 2 ) with high specific surface area (400 m 2 g −1 ) were synthesized by the one pot liquid-phase method using P123 (EO 20 PO 70 EO 20 ) as template and NaBH 4 as alkali and boron sources. The size of the B-α-Ni(OH) 2 nanoflowers is about 300 nm and there are many porous. The 50 nm nanoplates are the basic structure units of nanoflowers and thickness of the nanosheets is approximately 5 nm. The content of B is about 15% among the Ni, B, O elements and boron exists mainly in the form of BO 2 − , which was confirmed by XPS characterization. B-α-Ni(OH) 2 nanoflowers exhibit a high specific capacitance of ~2296 F g −1 at a charge and discharge current density of 3 A g −1 with excellent cycling ability. The high specific capacitance and remarkable rate capability are promising for applications of B-α-Ni(OH) 2 nanostructures as advanced electrochemical capacitor materials with both high energy and cycling ability.
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ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Mingshu Xiao,Yanping Tian,Yuhua Yan,Kai Feng,Yuqing Miao
In order to lower the energy barrier and improve the energy efficiency for hydrogen production by splitting water, highly efficient OER catalysts are required. Here, we report the electrodeposition of Ni(OH) 2 /NiOOH in the presence of urea showing the improved electrocatalysis for the hydrogen production in KOH electrolyte. By potential scanning, the Ni(OH) 2 colloid in alkali solution was transformed into the deposited Ni(OH) 2 /NiOOH. The presence of urea facilitates to deposit Ni(OH) 2 /NiOOH with higher electron transfer than the absence of urea, leading to a higher electrocatalytic OER. As supporting electrolyte , KOH exhibits better performance on the electrodeposition of Ni(OH) 2 /NiOOH and their OER electrocatalysis than NaOH. The work shows the potential application using cheap, non-precious metal-based electrocatalysts to overcome the well-known bottlenecks limiting power density of hydrogen fuel cell and energy efficiency of splitting water.
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CRYSTENGCOMM
·
2015
·Vol. 17
·期 13
·2690-2697
·
IF 4.034
Ke Tang,Jingcai Zhang,Wenzhi Wang,Shuping Wang,Jinxin Guo,Yanzhao Yang
A simple protocol has been reported here to successfully perform a controllable conversion between Ce(OH)4 nanorods [Ce(OH)4-NR] and Ce(OH)4 nanoflowers [Ce(OH)4-NF] based on a prolonged mechanical force-driven stirring process. Results show that the Ce(OH)4 nanostructures undergo a morphology transformation from the initial nanorods to irregular nanoflowers, then to nanoflowers emanating from one center only, by varying the stirring time before solvothermal reaction. The detailed study confirmed that the mechanical force significantly improved the mass transport of the solution and drove the seeds of Ce(OH)4-NR [seeds-NR] to generate the seeds of Ce(OH)4-NF [seeds-NF]. The final CeO2 products (CeO2 nanorods [CeO2-NR] and CeO2 nanoflowers [CeO2-NF]) that inherited the original morphology were obtained by annealing Ce(OH)4-NR and Ce(OH)4-NF, respectively. To further optimize the performance of the final products, Au/CeO2-NR and Au/CeO2-NF were synthesized by a simple oxidation–reduction process, which led to increased surface areas and promising potential in CO oxidation.
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AICHE JOURNAL
·
2015
·Vol. 62
·期 2
·580-588
·
IF 2.748
Zhixing Zhao,Xiao-Qiao Wang,Luting Ling,Cai-Feng Wang,Su Chen
The bottleneck of large-scale production of semiconductor quantum dots (QDs) is how to solve heavy metal ions waste water and the rapid separation during industrial process. A facile strategy for fabricating CdTe@Ca(OH) 2 nanocrystals exhibiting both improved photoluminescence (PL) stability and prolonged PL lifetime via an economical coprecipitating technology is reported herein. The procedure on capping CdTe QDs into Ca(OH) 2 crystals can enable the products to be easily filtrating separation and the content of residual Cd 2+ filtrate solution to be reached to 0.238 ppm level. Also, fluorescent rod-like heterocrystals by addition of saturated CaCl 2 solution is constructed. CdTe@Ca(OH) 2 nanocrystals is utilized further as phosphor powders to construct white light emitting diode (WLED). The WLED presented, here, has good photoelectric properties with color rendering index of 82.4 at 350 mA, a color temperature of 4643 k, and Commission Internationale de L'Eclairage coordinate of (0.3548, 0.3532), belonging to the white gamut, showing great potential in industrial application. © 2015 American Institute of Chemical Engineers AIChE J , 62: 580–588, 2016
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INORGANICA CHIMICA ACTA
·
2025
·
IF 3.2
Lei Yuan,Yuanzhen Liu,Zhenyu Zhu,Na Xin,Liwei Zhang,Chunming Xu
We introduce Co(OH)₂/Ni₂Co (PO₄)₂ composite nanomaterials, synthesized via hydrothermal synthesis, as potential high-stability cathode materials for hybrid supercapacitors (HSCs). Structural characterization tests, such as XRD, SEM, HRTEM, and XPS, revealed the subtleties of the morphology, structure, and composition of these nanostructures. The electrode material exhibits an ultra-high capacitance of 2131.2 F g −1 at 1 A g −1 . When combined with activated carbon (AC), the resulting HSC exhibits a high capacitance of 123.2 F g −1 and remarkable cycle life, with 94.6 % capacitance retention after 12,000 cycles. The device achieves an energy density of 39.5 Wh kg −1 at 750 W kg −1 . This study meticulously details the synthesis, structural characterization, and extensive electrochemical analysis, culminating in their effective application in HSCs.
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Foods
·
2024
·Vol. 13
·期 10
·1447
·
IF 4.7
Haijun Chang,Yu Hu,Yuanwei Shi,Jie Xiong,Zhaoying Bo
This study aimed to investigate the effect ofGnaphalium affineextract (GAE) (0.04, 0.2 and 1 mg/g protein) on the gel properties of porcine myofibrillar proteins (MPs) in a simulated Fenton oxidation system, using tea polyphenols (TPs) at similar concentrations of 0.04, 0.2, and 1 mg/g protein, respectively, as a contrast. The findings revealed that as the TP concentration increased, the water retention of MP gels decreased significantly (p< 0.05). In contrast, MP gels containing medium and high concentrations of GAE exhibited significantly higher water retention than those with low concentrations of GAE (p< 0.05). When the concentration of GAE was increased to 1 mg/g protein, the strength of MP gels was significantly reduced (p< 0.05) by 33.32% compared with the oxidized control group, suggesting that low and medium GAE concentrations support MP gel formation. A texture profile analysis indicated that an appropriate GAE concentration improved gel structure and texture. Dynamic rheological characterization revealed that low concentrations of TP (0.04 mg/g protein) and low and medium concentrations of GAE (0.04 and 0.2 mg/g protein) strengthened the protein gel system. Conversely, high concentrations of TP and GAE (1.0 mg/g protein) damaged the protein gel system or even promoted the collapse of the gel system. Scanning electron microscopy revealed that higher TP concentrations disrupted the gel, whereas low and medium GAE concentrations maintained a more continuous and complete gel network structure compared with the oxidized control group. This indicates that an appropriate GAE concentration could effectively hinder the destruction of the gel network structure by oxidation. Therefore, based on the obtained results, 0.2 mg/g protein is recommended as the ideal concentration of GAE to be used in actual meat processing to regulate the oxidization and gel properties of meat products.
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