JOURNAL OF ELECTROCERAMICS
·
2019
·Vol. 43
·期 1
·96-105
·
IF 1.966
Wang Ziyang,Chen Peng,Shi Wenjing,Li Yang,Li Dequan,Zhang Leiyang,Yan Yan,Wang Yifei,Peng He,Li Quan,Liu Gang
In the current investigation, the CuO modified BaTiO 3 ceramics were prepared through the conventional electroceramic processing. XRD, XPS, and SEM have been employed to characterize the phases, valences of ions and the microstructures. The sintering behaviors of the prepared samples were performed using a dilatometer, and ceramics could be fabricated at lower temperature. The electric field and temperature dependent energy storage performance have been studied. The introducing of CuO is very effective to improve the energy storage density and the efficiency due to the formed double P-E loops. 0.5 wt.% CuO modified ceramic exhibited an energy density of 0.52 J/cm 3 , which is nearly twice of pure BaTiO 3 ceramic. The J-E loops of CuO modified samples indicated double domain switches, consistent with the double P-E loops.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Zequn Chen,Hongfu Jia,Jingrun Yuan,Xi Liu,Chaohe Fang,Yunying Fan,Chuanbao Cao,Zhuo Chen
To achieve high activity and stability for both hydrogen and oxygen evolution reactions through the non-precious-metal based electrocatalysts is still facing the great challenge. Herein, we demonstrate a facile strategy to prepare CoP nanoparticles (NPs) loaded on N, P dual-doped carbon (NPC) electrocatalysts with high concentration N and P dopants through a pyrolysis-deposition-phosphidation process. The great bifunctional electrocatalytic activity for both HER (the overpotential of 98 mV and 86 mV at 10 mA cm −2 in both 0.5 M H 2 SO 4 and 1 M KOH electrolytes, respectively) and OER (the overpotential of 300 mV at 10 mA cm −2 in 1 M KOH electrolyte) were achieved. When CoP@NPC hybrid was used as two electrodes in the 1 M KOH electrolyte system for overall water splitting, the needed cell potential for achieving the current density of 10 mA cm −2 is 1.6 V, and it also showed superior stability for HER and OER after 10 h’ test with almost negligible decay. Experimental results revealed that the P atoms in CoP were the active sites for HER and the CoP@NPC hybrid showed excellent bifunctional electrocatalytic properties due to the synergistic effects between the high catalytic activity of CoP NPs and NPC, in which the doping of N and P in carbon led to a stronger polarization between Co and P in CoP, promoting the charge transfer from Co to P in CoP, enhancing the catalytic activity of P sites and Co sites in CoP for HER and OER, respectively. Specifically, the improvements could result from the changed charge state, the increased active specific surface area, and the facilitated reaction kinetics by N, P co-doping and admixture. This work provides a high-efficient, low-cost and stable electrocatalyst for overall water splitting, and throws light on rational designing high performance electrocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Fan Yang,Xing He,Chunxia Wang,Yan Cao,Yun Li,Linan Yan,Mengmeng Liu,Mingzhu Lv,Yanan Yang,Xu Zhao,Yongfeng Li
Eco-friendly phosphorus-doped carbon quantum dots (P-CQDs) have been successfully synthesized by facial hydrothermal treatment of phytic acid (PA) and sodium citrate. PA is selected because of its hexatomic ring structure with firm C-P bonds, abundant phosphate group and completely natural. In this case, the phosphorus content of the as synthesized P-CQDs achieves 8.52 wt.%. The P-CQDs show a narrow size distribution in the range of 2.5–4.5 nm and exhibit excellent sensitivity to Cu 2+ with an ultra-low detection limit of 1 nM. Furthermore, the P-CQDs have been applied in water sample to detect Cu 2+ , and the results are highly consistent with the data measured by inductively coupled plasma optical emission spectrometry. Therefore, the as synthesized P-CQDs display a great potential for applications in the area of Cu 2+ ion detection.
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2018
·Vol. 6
·期 5
·54
·
IF 1.279
Lei Chen,Cuiyun Liu,Yongjun Sun,Wenquan Sun,Yanhua Xu,Huaili Zheng
The ampholytic chitosan based flocculant carboxylated chitosan graft-(3-chloro-2-hydroxypropyl) trimethylammonium chloride-dimethyl diallyl ammonium chloride (CPCTS-g-P (CTA-DMDAAC)) was synthesized by photo polymerization using carboxylated chitosan (CPCTS), 3-chloro-2-chloropropyltrimethylammonium chloride (CTA) and dimethyldiallylammonium chloride (DMDAAC) as the cationic co-monomers. The effects of monomer concentration, the ratio of CPCTS and cationic monomers, cationic degree, initiator time, photoinitiator concentration, and pH value on the properties of CPCTS-g-P (CTA-DMDAAC) were studied. Themicrocystis aeruginosathat was cultured in laboratory was used for CPCTS-g-P (CTA-DMDAAC) flocculation tests. The effects of CPCTS-g-P (CTA-DMDAAC) dosage, pH value and G value on flocculation performance were investigated. The maximum removal rate of chlorophyll-a (Chl-a) and chemical oxygen demand (COD) that were obtained by CPCTS-g-P (CTA-DMDAAC) were 98.8% and 96.5% under the conditions of dosage 4 mg/L, pH 7 and G value 200 s−1, respectively. The flocculation experiments showed that chitosan-based flocculant CPCTS-g-P (CTA-DMDAAC) had better flocculation performance than commercially available flocculants cationic polyacrylamide (CPAM), Polyferric Sulfate (PFS), and polymeric aluminium (PAC).Keywords:chitosan-based flocculant;alga removal;graft copolymerization;photopolymerization;flocculation properties
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 16
·13453-13460
·
IF 3.201
Zhangkang Li,Huiyu Bai,Shengwen Zhang,Wei Wang,Piming Ma,Weifu Dong
In this paper, poly(N-isopropylacrylamide) (PNIPPAm), polyacrylic acid (PAA), polyvinyl alcohol (PVA) and cellulose nanocrystals (CNC) were used to prepare double-network hydrogels by the photo-crosslinking technology. The results from mechanical and swelling tests indicated that photo-crosslinked PVA/CNC/P(NIPPAm-co-AA) hydrogels exhibited temperature-sensitive, pH-sensitive behaviors and good mechanical strengths. We prepared DN hydrogels, which combined the advantages of PNIPAAm, PAA and photo-crosslinking collectively in the PVA/CNC system, leading to controllable temperature and pH responses and improvement in physical properties. A simple and green method for the preparation of DN hydrogels was demonstrated, offering photo-crosslinked PVA/CNC/P(NIPPAm-co-AA) hydrogels as excellent prospects for applications in the medical field.
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 34
·8596-8602
·
IF 5.16
Yong Xu,Jiang Mo,Zi-Cheng Fu,Su Liu,Zhi Yang,Wen-Fu Fu
Graphical A hybrid photocatalyst consisting of Co and Co 2 P nanoparticles embedded in N, P-codoped carbon nanosheets was used in a visible light-driven system for CO 2 -to-CO conversion. The catalytic system displayed a high CO production rate of up to 35 000 μmol h −1 g −1 with CO selectivity of 79.1 % in the first 3 h of reaction. Linear CO production at an exceptionally high rate of 63 000 μmol h −1 g −1 was observed in the first 1 h of photocatalytic reaction. Artificial photosynthesis has attracted wide attention, particularly the development of efficient solar light-driven methods to reduce CO 2 to form energy-rich carbon-based products. Because CO 2 reduction is an uphill process with a large energy barrier, suitable catalysts are necessary to achieve this transformation. In addition, CO 2 adsorption on a catalyst and proton transfer to CO 2 are two important factors for the conversion reaction, and catalysts with high surface area and more active sites are required to improve the efficiency of CO 2 reduction. Here, a visible light-driven system for CO 2 -to-CO conversion is reported, which consists of a heterogeneous hybrid catalyst of Co and Co 2 P nanoparticles embedded in carbon nanolayers codoped with N and P (Co-Co 2 P@NPC) and a homogeneous Ru II -based complex photosensitizer. The average generation rate of CO of the system was up to 35 000 μmol h −1 g −1 with selectivity of 79.1 % in 3 h. Linear CO production at an exceptionally high rate of 63 000 μmol h −1 g −1 was observed in the first hour of reaction. Inspired by this highly active catalyst, Co@NC and Co 2 P@NPC materials were also synthesized and their structure, morphology, and catalytic properties for CO 2 photoreduction were explored. The results showed that the nanoparticle size, partially adsorbed H 2 O molecules on the catalyst surface, and the hybrid nature of the systems influenced their photocatalytic CO 2 reduction performance.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 8
·7725-7732
·
IF 2.195
Ullah S.,Han Z.,Zheng Guangping
The nanocomposites consisting of graphene oxide (GO) and ferroelectric copolymer poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] have been successfully synthesized by a co-evaporation method. The structural, dielectric and ferroelectric properties of the composite papers are investigated. The Raman spectroscopy analyses on the nanocomposites GO/P(VDF-TrFE) reveal that the defects in GOs are reduced significantly by the loading of ferroelectric P(VDF-TrFE). The I G /I D ratio increases from 1.02 (for pure GO) to 1.17 [for GO/P(VDF-TrFE)-10%], revealing that the defects are reduced by the introduction of the nano-fillers due to a strong interaction between GO and P(VDF-TrFE) in the nanocomposites. The permittivity of the nanocomposites is enhanced by almost 3-times as compared to that of the pristine GOs. The nanocomposites show a notably raised polarization with high applied electric field. Furthermore, due to the high dielectric constants, the electrical energy storage density of the nanocomposites is as high as ~ 39.89 J cm −3 at 2.8 MV cm −1 . The large energy density and high dielectric break down strength suggest that GO/P(VDF-TrFE) could be the promising novel materials for electrical energy storage.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Shan Wang,Laifei Xiong,Jinglei Bi,Xiaojing Zhang,Guang Yang,Shengchun Yang
The enhancement in the catalytic activity of PtM (transition metals, TMs) alloy nanoparticles (NPs) results from the electronic structure of Pt being modified by the TM. However, the oxidation of the TM would lead to the electronegativity difference between Pt and TM being much lowered, which induces a decrease in the number of electrons transferred from the TM to Pt, resulting in excessive oxygenated species accumulating on the surface of Pt, thus deteriorating their performance. In this work, the oxygen reduction reaction (ORR) performance of PtNi (Pt68Ni32) concave octahedral NPs (CONPs) in alkaline electrolytes is much improved by doping small amounts of phosphorus. The P-doped PtNi CONPs (P-PtNi) show about 2 and 10 times enhancement for ORR compared to PtNi and commercial Pt/C catalysts. The high-angle annular dark-field scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy mapping characterizations reveal that the P dopant uniformly distributes throughout the CONPs, Pt mainly locates at the edges and corners, whereas Ni situates at the center, forming a P-doped Pt-frame@Ni quasi-core–shell CONP. The X-ray photoelectron spectroscopy spectra indicate that the P dopant obviously increases the electron density of Pt compared with that of PtNi NPs, which contributes to the stabilization of the electronic structure of PtNi CONPs, thus restraining the excessive HO2– species produced on the catalysts, which endow them with a high catalytic performance in the ORR. In addition, the P attached to the Ni sites in the PtNi NPs partially prevents the Ni atoms being oxidized by the external O species, which is conducive to the structural and electrochemical stability of the PtNi NPs during the ORR. The present results provide a new insight into the development of ORR catalysts with low utilization of Pt.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Ao Liu,Huihui Zhu,Yong-Young Noh
An optimized polyol reduction method was proposed for p-type CuxO deposition using a spin-coating method at low temperatures. The film characterizations and the electrical properties of integrated thin-film transistors (TFTs) were investigated as a function of annealing temperature and polyol type. The CuxO TFTs derived from propylene glycol showed the optimal performance with an average field-effect hole mobility of 0.15 cm2 V–1 s–1, an on/off current ratio of ∼104, and a threshold voltage of −7 V at a low temperature of 220 °C. Considering few investigations on the operational/air stability of solution-processed p-type oxide TFTs, we carried out systematical studies and revealed different roles of O2 and H2O on the device performance. The low activation energy (0.16 eV) for hole transport and high voltage gain (37) of the composed complementary inverter highlight great potential for the construction of all oxide-based transparent flexible electronics and circuits.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Dan Zhao,Deying Liang,Huan Liu,Xincai Xiao
Hypoxanthine (Hx) and pH are important indicators for evaluating the freshness of aquatic products, and their rapid assessment can maximize public food safety and minimize economic losses. A nanozymes-loaded smart responsive hydrogel compound provides a new strategy for rapidly assessing the freshness of aquatic products. Accordingly, this paper reports the preparation of a hydrogel compound with pH responsiveness and peroxidase (POD) activity using a one-step method. In this method, sodium alginate, chitosan, and gelatin are used as the raw materials and Fe,Co,P-CDs (CDs) with POD activity as well as 3,3′,5,5′-tetramethylbenzidine and H 2 O 2 are simultaneously introduced as substrates. The hydrogel compound transforms from a solid to a sol based on its pH response (pH = 6.5–8.0), and its color changes from blue to colorless because of its Hx response to the inhibition of the POD activity of CDs. The color difference shows a good linear relationship with the Hx concentration in the range of 1.5–1500 μM, with a detection limit of 1.48 μM and an excellent recovery rate of practical samples. Based on the pH enhancement and Hx accumulation during the spoilage of shrimps, naked-eye and smartphone-assisted, real-time monitoring of the freshness of shrimp has been realized through the morphology and color changes of the hydrogel compound. This dual-response hydrogel compound provides a new strategy for monitoring the freshness of aquatic products with great potential in food safety monitoring.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Peng Yin,Xiaohan Bie,Qingyang Tang,Linwei Zhu,Runhua Fan,Davoud Dastan,Hongzhi Cui,Kun Zhang,Zhicheng Shi
Polymer dielectrics characterized by high power density, fast discharge rate and reliability are critical in pulse energy storage systems. However, the low discharge energy density (Ud) of polymer dielectrics, stemming from the inverse coupling between dielectric constant (εr) and breakdown strength (Eb), renders them insufficient to meet miniaturized requirements of modern electronics. To address this challenge, we propose constructing dual interfacial gold nanodot interlayers within a barium titanate (BT)/poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)) trilayer composite (BT-3L) to synergistically enhance its εr and Eb, ultimately achieving high Ud. Specifically, dual gold nanodot interlayers are anchored at the interface between the P(VDF-HFP) outer layer and the BT/P(VDF-HFP) middle layer via sputtering and hot-pressing processes. Benefiting from the interfacial polarization and Coulomb blockade effect induced by gold nanodots, the concurrently enhanced εr of 12.9 at 10 kHz and Eb of 520.08 MV m−1 are achieved. Consequently, a significantly improved Ud of 14.78 J cm−3, which is approximately 176.4% that of the BT-3L composite (∼8.38 J cm−3), is further realized in this composite with dual gold nanodot interlayers. This work provides a promising approach for designing high-performance multilayer dielectric composites.
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-5
·
IF 5.228
Ling Yun,Xie Wen Chang,Liu Guo Kun,Yan Run Wen,Wu De Yin,Tang Jing
Inter- and intra- molecular hydrogen bonding plays important role in determining molecular structure, physical and chemical properties, which may be easily ignored for molecules with a non-typical hydrogen bonding structure. We demonstrated in this paper that the hydrogen bonding is responsible for the different Raman spectra in solid and solution states of p-Nitrothiophenol (PNTP). The consistence of the theoretical calculation and experiment reveals that the intermolecular hydrogen bonding yields an octatomic ring structure (8) of PNTP in the solid state, confirmed by the characteristic S-H---O stretching vibration mode at 2550 cm −1 ; when it comes to the solution state, the breakage of hydrogen bond of S-H---O induced the S-H stretching vibration at 2590 cm −1 . Our findings may provide a simple and fast method for identifying the intermolecular hydrogen bonding.
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）