JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 4
·3796-3805
·
IF 1.798
Hou Huilin,Gao Fengmei,Shang Minghui,Wang Lin,Zheng Jinju,liu Qiao,Yang Zuobao,Xu Jiahuan,Yang Weiyou
Improving the photocatalytic efficiency of TiO 2 semiconductor is crucially important and highly desired for its practical applications. In the present work, aiming to broaden the photoresponse window and limit the photocatalyst aggregation, we reported the exploration of N-doped TiO 2 thoroughly mesoporous nanofibers with high purity in morphology via a foaming-assisted electrospinning strategy. The foaming agents and urea were introduced in the raw materials to create the mesopores and incorporate the N dopants into the conventional solid TiO 2 nanofibers, respectively, which could be accomplished simultaneously over one-step calcination process. The synergetic combination of N dopants and one-dimensional mesoporous nanostructure allow the TiO 2 fibers to exhibit significantly enhanced visible-light photocatalytic activity toward the Rhodamine B and hydrogen evolution, as compared to those of N-doped solid and intrinsic thoroughly mesoporous counterparts, suggesting their promising applications in water purification and energy supply.
✓ 已验证
产品关联
DOI
高影响因子
FIRE SAFETY JOURNAL
·
2014
·
IF 1.063
Yan Liu,Zhenhu Cao,Yan Zhang,Zhengping Fang
Zinc N -morpholinomethylphosphonic acid (MMPA-Zn) is synthesized by hydrothermal reactions used zinc acetate and N -morpholinomethylphosphonic acid as raw materials. TGA shows that the TG onset temperature of decomposition of MMPA-Zn is 391 °C and the final residue at 700 °C is 65.3 wt%, indicating its good thermal stability and char-forming ability. Then, MMPA-Zn is used as flame retardant in high density polyethylene (HDPE). The thermal property and flame retardancy of various HDPE compositions were investigated by TGA and cone calorimeter (Cone). TG data show that MMPA-Zn can improve the thermal stability and char residue yield, which is dependent on the loading amount of MMPA-Zn. The Cone data indicate that the PHRR and the emission of CO decreased obviously because of the joint effect of Zn and the MMPA in MMPA-Zn molecular, which can yield more char residue in the HDPE/MMPA-Zn system.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 27
·11481-11489
·
IF 3.5
Fangyou Meng,Qing Chen,Kaiyi Shi,Shuangzhu Jia,Xuexin Dai
This study investigated a novel electrocatalyst with a core–shell structure of CoNiP@N,P-C. The unique carbon shell of this catalyst serves a dual purpose: exposing numerous active sites and safeguarding CoNiP nanoparticles from dissolution caused by the electrolyte. As a result, the CoNiP@N,P-C nanoparticles exhibit exceptional electrochemical properties. The CoNiP@N,P-C catalyst displays overpotentials of 234 and 314 mV for the HER and OER, respectively, within a simulated seawater solution (1 M KOH + 0.5 M NaCl), indicating its outstanding catalytic performance. Moreover, when subjected to full seawater splitting, the CoNiP@N,P-C catalyst exhibited high activity, achieving a 1.71 V cell voltage at a current density of 10 mA cm−2. As revealed by density functional theory (DFT) calculations, the CoNiP@N,P-C catalyst exhibits Gibbs free energy for hydrogen adsorption (ΔGH* = −0.19 eV) that is decreased in comparison with CoP@N,P-C, NiP@N,P-C, and N,P-C (−0.321 eV, −0.434 eV, and 0.723 eV, respectively). This finding confirms that the core–shell structure plays a role in enhancing the HER kinetics and improving the catalytic performance, which is consistent with the experimental observations. Consequently, this study introduces the concept of utilizing bimetal phosphide core–shell structures for overall seawater splitting, offering a novel approach in this field of research.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Yinuo Wang,Yian Wang,Qinglan Zhao,Hongming Xu,Shangqian Zhu,Fei Yang,Ernest P. Delmo,Xiaoyi Qiu,Chi Song,Juhee Jang,Tiehuai Li,Ping Gao,M. Danny Gu,Minhua Shao
Urea generation through electrochemical CO 2 and NO 3 − co-reduction reaction (CO 2 NO 3 RR) is still limited by either the low selectivity or yield rate of urea. Herein, we report copper carbonate hydroxide (Cu 2 (OH) 2 CO 3 ) as an efficient CO 2 NO 3 RR electrocatalyst with an impressive urea Faradaic efficiency of 45.2% ± 2.1% and a high yield rate of 1564.5 ± 145.2 μg h −1 mg cat −1 . More importantly, H 2 evolution is fully inhibited on this electrocatalyst over a wide potential range between −0.3 and −0.8 V versus reversible hydrogen electrode. Our thermodynamic simulation reveals that the first C-N coupling follows a unique pathway on Cu 2 (OH) 2 CO 3 by combining the two intermediates, *COOH and *NHO. This work demonstrates that high selectivity and yield rate of urea can be simultaneously achieved on simple Cu-based electrocatalysts in CO 2 NO 3 RR, and provide guidance for rational design of more advanced catalysts.
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 24
·11924-11933
·
IF 9.3
Jinlong Hu,Weijun Xu,Lingzhi Zhang
Metal fluorides confined in heteroatom-doped carbon nanostructures are viewed as one of the most promising high capacity cathodes for high-performance lithium rechargeable batteries. Herein, we present a facile in situ reaction approach to synthesize nitrogen-doped porous carbon (NPC)-confined metal fluorides, which involves in situ etching toward a Schiff-base organic precursor and fluorination of metal oxides by polytetrafluoroethylene during a one-step heating process. The afforded NPC-confined FeF3 (FeF3@NPC) facilitates fast Li+/e− diffusion kinetics, accommodates severe volume fluctuation and reduces the FeF3 cathode dissolution, thus providing an outstanding high-rate capacity of 181 mA h g−1 at 5 C, accompanied by superior cycle life within 500 cycles at 2 C. This novel approach opens up new horizons to design high-performance nanoconfined metal fluoride-based materials for sustainable energy applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yuying Zhao,Shengchun Hu,Qixin Yuan,Ao Wang,Kang Sun,Ziyun Wang,Mengmeng Fan,Jianchun Jiang
Electrochemical CO 2 conversion into formate by intermittent renewable electricity, presents a captivating prospect for both the storage of renewable electrical energy and the utilization of emitted CO 2 . Typically, Cu-based catalysts in CO 2 reduction reactions favor the production of CO and other by-products. However, we have shifted this selectivity by incorporating B, N co-doped carbon (BNC) in the fabrication of Cu clusters. These Cu clusters are regulated with B, N atoms in a porous carbon matrix (Cu/BN-C), and Zn 2+ ions were added to achieve Cu clusters with the diameter size of ∼1.0 nm. The obtained Cu/BN-C possesses a significantly improved catalytic performance in CO 2 reduction to formate with a Faradaic efficiency (FE) of up to 70 % and partial current density (j formate ) surpassing 20.8 mA cm −2 at −1.0 V vs RHE. The high FE and j formate are maintained over a 12-hour. The overall catalytic performance of Cu/BN-C outperforms those of the other investigated catalysts. Based on the density functional theory (DFT) calculation, the exceptional catalytic behavior is attributed to the synergistic effect between Cu clusters and N, B atoms by modulating the electronic structure and enhancing the charge transfer properties, which promoted a preferential adsorption of HCOO* over COOH*, favoring formate formation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 22
·10273-10283
·
IF 2.7
Jing Liao,Ke Yin,Xiaodong Chen,Bichun Huang
The preparation of efficient and cheap adsorbents is important for the removal of chlorinated volatile organic compounds, which are carcinogenic, teratogenic, and mutagenic to human health. In this study, ethylenediamine and ZnCl2 were introduced simultaneously into Camellia oleifera shell-based biochar by the impregnation method. A series of nitrogen doped porous carbons (ANOC-x) were prepared by adjusting the ethylenediamine impregnation ratio combined with NaOH activation. Among them, the chlorobenzene adsorption capacity of ANOC-1.5 reached 1187 mg g−1, which was 1.4 times that of undoped porous carbon. This was attributed to that ANOC-1.5 had the maximum specific surface area (2685 m2 g−1) and a hierarchical porous structure, which provided abundant adsorption sites and mass transfer channels for chlorobenzene adsorption. In addition, the chlorobenzene adsorption performance of porous carbon was highly correlated with surface defects, which was attributed to the fact that the surface of ANOC-1.5 (0.615 at%) contains more pyrrole heterocycles than AOC (0.258 at%), forming more π-electron rich defect sites. These defect sites had strong π–π interactions with chlorobenzene molecules, which could easily bind with the aromatic rings of chlorobenzene, thus improving the adsorption capacity of chlorobenzene. Moreover, ANOC-1.5 had high thermal stability and excellent regeneration performance, and its adsorption capacity for chlorobenzene remained above 90% after five regeneration tests, which exhibited potential for industrial applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2024
·
IF 2.6
Li Jiaxin,Guo Hui,Ji Weiwei,Chen Hanqi,Zhao Fengju,Yang Wei,Guo Lili,Qian Junqing
Tyrosinase inhibitors have the ability to resist melanin formation and can be used for clinical and cosmetic, so it is becoming extremely crucial to search a rapid and effective method for detecting t the activity of tyrosinase. In this study, a sensing probe based on Nitrogen-doped graphene quantum dots (N-GQDs) were prepared with carbamide and citric acid. Tyrosinase can oxidize dopamine to dopamine quinone, which can quench the fluorescence of N-GQDs based on the principle of fluorescence resonance energy transfer (FRET) process, and then the detection of tyrosinase activity can be achieved. The result demonstrated that the fluorescence intensity of N-GQDs was a linear correlation with the activity of tyrosinase. Wide detection linear ranges between 0.05 and 5 U/mL and high selectivity. The detection range of tyrosinase was 0.05 to 5 U/mL and LOD of 0.005 U/mL. According to the above, the fluorescence method established in this work could be successfully used for the trace analysis of tyrosinase and it was verified that KA is an inhibitor of tyrosinase.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 5
·3146-3157
·
IF 3.9
Yanlong Hu,Qiang Wang,Dingkai Hu,Yingshuang Zhang,Muhammad Furqan,Shijian Lu
Monoethanolamines (MEAs) are widely used for CO2 capture, but their regeneration energy consumption is very high. CO2 Phase change absorbents (CPCAs) can be converted into CO2-rich and CO2-lean phases after absorbing CO2, and the regeneration energy consumption can be reduced because only the CO2-rich phase is thermally desorbed. In this paper, a novel CPCA with the composition “MEA/n-butanol/H2O (MNBH)” is proposed. Compared with the reported MEA phase change absorbent, the MNBH absorbent has higher CO2 absorption capacity, smaller absorbent viscosity and CO2-rich phase volume. The MNBH absorbent has the highest CO2 absorption capacity of 2.5227 mol CO2 per mol amine at a mass ratio of 3 : 4 : 3. The CO2 desorption efficiency reaches 89.96% at 120 °C, and the CO2 regeneration energy consumption is 2.6 GJ tCO2−1, which is about 35% lower than that of the 30 wt% MEA absorbent. When the mass ratio of MNBH absorbent was 3 : 6 : 1, the CO2 recycling capacity was 4.1918 mol CO2 L−1, which is 76% higher than that of the conventional 30 wt% MEA absorbent. The phase change absorbent developed in this paper can reduce the desorbent volume by about 50% and has good absorption performance for CO2 in flue gas.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Zhaolin Xu,Xiangnan Chen,Shaoxi Zhang,Ruohao Li,Guangjun Gou
With the development of communication and automatization technology, the demand for electromagnetic absorbing materials is continuously rising. The key problem lies in expanding and regulating the electromagnetic absorption band . Among these materials, carbonized polymers stand out in terms of electromagnetic absorption due to their lightweight, low cost and designability. The carbonized polymers can bridge varies of substances to construct lightweight nitrogen-doped carbon composites, achieving broadband and tunable-band designs. In this study, Fe-C-N anchored TiO 2 hierarchical structure is simply realized by carbonizing polypyrrole/MXene precursors. FeCl 3 are designed to be as the initiator for the polymerization of pyrrole and in situ as a doping Fe source. Moreover, by controlling the carbonization temperature, the electromagnetic absorption band can be obviously regulated from C to Ku band. The multi-layered TiO 2 structure brings enhanced structural losses and better electromagnetic energy dissipation pathways, while the crystalline/amorphous interfaces and hybridizations between Fe-C-N and TiO 2 boost the interfacial polarizations and dipole polarizations. Besides, the introduction of Fe compounds leads to ferromagnetism and magnetic losses, which improves the impedance matching. This work provides referencing ways for the design of broadband electromagnetic absorbing materials.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yuan Qu,Ziwen Ding,Xiaotong Yuan,Feiyu Zhang,Ke Xu,Xiang Lu,Song Liu,Siqi Li,Wei Ji
The fabrication of gas sensors based on metal oxide semiconductors (MOS) with high sensitivity and low detection limits is a crucial research domain. Modulation of microstructural features is a critical strategy to enhance gas sensing performance, owing to its controllability and inherent design flexibility. The double-shell structure amplifies active surface sites and nested effects, further heightening gas-sensor interaction for escalated adsorption efficiency and reaction rates. In this paper, we fabricated hierarchical double-shell ZnO hollow microsphere (D-ZnO) sensors via a scalable technique, incorporating uniformly spherical carbon templates. These D-ZnO-based sensors demonstrated a high response (32.42) to 100 ppm n-butanol and achieved a low detection limit (DL) of 96 ppb at the optimized temperature of 240 °C. Such excellent gas sensing performance of D-ZnO can be attributed to the unique spatial structure of hierarchical double-shell for the modulation of gas diffusion pathways and collision frequency.
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2025
·
IF 6.3
Yan Chen,Qingsong Luo,Yu Wan,Shuang Gao,Yanting Wang,Changhao Feng
Background The rapid identification of n-butanol holds substantial significance; however, the current response speed of n-butanol gas sensors is relatively slow. The ZnO/SnO 2 composite nanofibers present a considerable prospect as a suitable alternative for conventional n-butanol sensors. Methods Pure SnO 2 and composite nanofibers composed of ZnO/SnO 2 with distinct molar ratios were crafted via the electrospinning technique. The microstructure and components of these composite nanofibers were analyzed and identified using XRD and SEM. Significant findings The ZnO/SnO 2 composite nanofibers-based gas sensor (ZS2) exhibited enhanced response towards n-butanol, achieving a high response of 29.68 to 30 ppm n-butanol at 150 °C, which was 3.3 times greater than that of SnO 2 . Moreover, the sensor also showcased a swift response time, taking just 1 s to react. Furthermore, the ZS2 sensor had a lower potential limit for detecting n-butanol, with a value of 0.27 ppm. The good repeatability and stability were also confirmed in this study. The successful creation of heterojunctions is thought to be contributing factors to ZS2 nanofibers’ superior sensing capabilities. Therefore, ZnO/SnO 2 composite nanofibers can be considered as a promising candidate for sensing materials in practical applications.
✓ 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）