Materials Today Communications
·
2021
·
IF 3.383
Daifeng Wu,Rui Li,Tai Sun,Renheng Tang,Fangming Xiao
Mg/MgH 2 as a thermochemical energy storage (TCES) material suffers from a slow hydrogenation-dehydrogenation kinetic and poor reversibility. Addition of metal oxide is an effective way to improve the kinetic properties of Mg/MgH 2 . However, there is little study on the effects of complex oxides . Thus, the catalytic effects of complex metal oxides and its catalytic mechanism were investigated in this paper. Results show that the dehydrogenation peak temperature and apparent activation energy of MgH 2 -Ta 2 O 5 are 320.8 °C and 128.54 kJ/mol. Combined with complex metal oxide, MgH 2 -Ta 2 O 5 -Nd 2 O 3 could further reduce the dehydrogenation peak temperature (307.2 °C) and apparent activation energy (95.33 kJ/mol). MgO and NdH 2.61 are found in the dehydrogenated MgH 2 -Ta 2 O 5 -Nd 2 O 3 , indicating that n-typed oxide Ta 2 O 5 and p-typed oxide Nd 2 O 3 are formed and improved the kinetics properties of MgH 2 . Furthermore, Nd 2 O 3 /Ta 2 O 5 interface is formed and acted as “p-n junction”. When heating, the “p-n junction” is exposed to thermal radiation and produce electrons and holes, and then the kinetics properties of MgH 2 are further enhanced.
研究领域:
材料科学
·
能源化学
·
物理化学
·
无机功能材料
·
热能存储
✓ 已验证
DOI
高影响因子
Journal of Sulfur Chemistry
·
2020
·
IF 1.963
Lin Yan,Jun Yang,Xu-Feng Liu,Yu-Long Li,Xing-Hai Liu,Zhong-Qing Jiang
In this article, two new binuclear iron compounds [Fe2(CO)5PPh(C6H11)2{µ-SCH2CH(CH2CH3)S}] (2) and [Fe2(CO)5PPh2(C6H11){µ-SCH2CH(CH2CH3)S}] (3), which can be regarded as the biomimics for the active site of [FeFe]-H2ases, have been synthesized by CO exchange of compound [Fe2(CO)6{μ-SCH2CH(CH2CH3)S}] (1) with cyclohexyldiph-enylphosphine or dicyclohexylphenylphosphine and their structures have been confirmed by spectroscopy, elemental analysis, and X-ray crystallography. They also exhibited good electrocatalytic activities for the generation of H2.
研究领域:
无机化学
·
材料科学
·
生物无机化学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Zhong Chen,Qiao Chen,Dongyuan Li,Yi Zhong,Hongzhen Chen,Wei Peng
Conversion of heavy oil is urgent as most of the explored fossil oil reserves and renewable raw biodiesel can be categorized as heavy oil. Supercritical water upgrading (SCWU) is a green and promising technology for heavy oil conversion, but the hydrogen-donating capacity of pure water is inadequate. This study adopts transition-metal hydroxide (M–OH) to enhance the in situ hydrogen-donating capacity of water for the first time. Both M–OH and the corresponding metal oxide nanoparticle (MOn) of one post-transition metal (Al) and five transition metals (Cr, Cu, Fe, Ni, Zn) are tested. The SCWU conditions are selected as 425 °C, 60 min, water-to-oil ratio of 4:1, catalyst-to-oil ratio of 1:10, and water density of 308 kg m–3. Deuterium oxide (D2O) instead of H2O is used as the reaction medium for a deuterium tracing study. Results indicate that the different metal-based MOn nanoparticles display various effects on heavy hydrocarbon cracking, gasification, coke suppression, and D addition reactions. The overall performance is found to be on the order of NiO > Cr2O3 > Fe2O3 > CuO > Al2O3 > ZnO. Compared to MOn, M–OH can generally improve the oil yield and H/C ratio and reduce the coke yield simultaneously. The mechanism analysis suggests that the M–OH decomposition behavior under hydrothermal conditions is the primary cause by which MOn and lattice H2O are generated in the oil-rich phase. The lattice H2O can not only take part in SCWU reactions but also suppress coke formation. In conclusion, M–OH is a promising catalyst as it combines the good dispersibility and catalytic activity of MOn nanoparticles and the low cost of water-soluble inorganic metal salts (M-IAc) but does not result in any corrosive species, such as inorganic acid from M-IAc.
研究领域:
化学工程
·
能源技术
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2021
·
IF 3.981
Xiangjun Shi,Chao Wang,Qifeng Chen,Shuimei Shen,Shengjie Song,Xiyue Zhou
Ibrutinib(IBR) is an irreversible Bruton's tyrosine kinase inhibitor and has been classified as the Biopharmaceutical Classification System (BCS) class Ⅱ drug. The objective of the current study was to improve the physicochemical properties of IBR by co-crystallization. Based on ΔpKa analysis and structure analysis, we reported seven IBR pharmaceutical cocrystals with different structure types of co-formers such as hydroxy-2-naphthoic acids, mono-hydroxybenzoic acids, and aliphatic acids via the slurry method and ultrasonic method. The seven prepared cocrystals were characterized by powder X-ray diffraction(PXRD), differential scanning calorimetry(DSC), thermogravimetric analysis(TGA) and Fourier transform infrared spectroscopy(FT-IR). The solubility and accumulative dissolution of IBR cocrystals were explored. It was found that the solubility and dissolution were optimally increased up to 6.64 times and 1.85 times than that of IBR Form A, respectively. Moreover, all the IBR cocrystals maintained a stable cocrystal state after 90-d under 40 °C/75% RH condition and after 30-d under 60 °C/0% RH condition. According to the results analysis, there may be hydrogen bond(H-bond) and π-π stacking interactions in the IBR cocrystal system. The current study demonstrated that the co-crystallization of IBR with specific co-formers proposed a prospective technology and optional strategy to modify the physicochemical nature of IBR.
研究领域:
药学
·
化学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2015
·Vol. 6
·期 9
·3027-3037
·
IF 5.426
Yanan Liu,Yufei He,Daran Zhou,Junting Feng,Dianqing Li
Aiming at the preparation of catalysts with well-controlled structures, bimetallic PdCu catalysts containing only small amounts of Pd were prepared by two different methods for partial hydrogenation of acetylene. The highly dispersed and stable PdCu catalyst with the Pd : Cu atomic ratio of 1 : 40 was obtained from a Pd(OH)2/CuMgAl hydrotalcite (HT) precursor by a modified co-precipitation method. The obtained PdCu catalyst possessed uniform PdCu nanoalloys with an average size of 1.8 ± 0.3 nm. As a comparison, the impregnation method was also employed to prepare bimetallic PdCu catalysts and it was confirmed that the Pd-rich(core)–Cu-rich(shell) structure was dominant. Under identical reaction conditions, approximately 100% conversion and 82% selectivity at 100 °C were achieved using the PdCu nanoalloy catalyst which were 23% and 12% higher than those of the Pd-rich(core)–Cu-rich(shell) catalyst. The preferable activity was ascribed to the homogeneous nanoalloy structure and small size effect. The enhanced selectivity was attributed to the strong synergistic effect of PdCu. More significantly, this superior catalytic performance can be retained after 48 h of continuous reaction due to the excellent resistibility against carbon deposition and the confinement effect.
研究领域:
催化化学
·
材料科学
·
有机合成
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Man Chen,Xuezhang Xiao,Meng Zhang,Meijia Liu,Xu Huang,Jiaguang Zheng,Yiwen Zhang,Lijun Jiang,Lixin Chen
Nowadays, catalytic doping has been regarded as one of the most promising and effective methods to improve the sluggish kinetics of magnesium hydride (MgH 2 ). Herein, we synthesized Ni/TiO 2 nanocomposite with the particle sizes about 20 nm by an extremely facile solvothermal method . Then, the Ni/TiO 2 nanocomposite was doped into MgH 2 to enhance its reversible hydrogen storage properties. A remarkably enhancement of de/rehydrogenation kinetics of MgH 2 can be achieved by doped with Ni/TiO 2 nanocomposite, compared to that solely doped with Ni or TiO 2 nanoparticles . The hydrogen desorption peak temperature of MgH 2 Ni/TiO 2 is 232 °C, which is 135.4 °C lower than that of ball-milled MgH 2 (367.4 °C). Moreover, the MgH 2 Ni/TiO 2 can desorb 6.5 wt% H 2 within 7 min at 265 °C and absorb ∼5 wt% H 2 within 10 min at 100 °C. In particular, the apparent activation energy of MgH 2 Ni/TiO 2 is obviously decreased from 160.5 kJ/mol (ball-milled MgH 2 ) to 43.7 ± 1.5 kJ/mol. Based on the analyses of microstructure evolution , it is proved that metallic Ni particles can react with Mg easily to form fine Mg 2 Ni particles after dehydrogenation , and the in-situ formed Mg 2 Ni will transform into Mg 2 NiH 4 in the subsequent rehydrogenation process. The significantly improved hydrogen absorption/desorption properties of MgH 2 Ni/TiO 2 can be ascribed to the synergistic catalytic effect of reversible transformation of Mg 2 Ni/Mg 2 NiH 4 which act as “hydrogen pump”, and the multiple valence titanium compounds (Ti 4+/3+/2+ ) which promote the electrons transfer of MgH 2 /Mg.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Liang Geng,Wenjun Li,Mei Dong,Yueyan Fan,Yajie Li,Li Yang,Ruixue Huang,Yuan Liu
Lanthanide oxides have potential advantages for photocatalytic hydrogen production . To systematically investigate the photocatalytic performance of lanthanide oxides on metal sulfides , a series of Ln x O y /ZnIn 2 S 4 (Ln x O y /ZIS) were synthesized by hydrothermal method . Comprehensive characterization demonstrated that Ln x O y synergistically improved the performance of ZnIn 2 S 4 by extending light absorption, reducing contact interface resistance and enhancing carrier separation. The photocatalytic hydrogen evolution (PHE) rates of the Ln x O y /ZIS photocatalysts were improved, which were 1.6–4.2 times higher than those of pure ZnIn 2 S 4 (198.0 μmol g −1 h −1 ). The PHE rates of Ln x O y /ZIS decreased with increasing lanthanide atomic number, and when the lanthanides contained variable valence ions, the PHE rates of Ln x O y /ZIS were superior to those of neighbouring lanthanides. The heterojunction formed by Ln x O y and ZnIn 2 S 4 effectively promoted carrier separation. Lanthanide ions with unoccupied 4 f orbital were more likely to accept electrons and served as a hydrogen adsorption site for further hydrogen reduction. Multivalent ions could also promote the migration of electrons and generate oxygen vacancies to inhibit the recombination of carriers. In conclusion, for ZnIn 2 S 4 , lanthanide oxides are promising candidates to improve the performance of PHE. This study provides guidance on the selection of appropriate lanthanide oxides for the construction of efficient sulphur-based heterojunction photocatalysts.
研究领域:
材料科学
·
化学
·
催化
·
能源材料
✓ 已验证
DOI
高影响因子
Soft Matter
·
2017
·Vol. 13
·期 43
·7962-7968
·
IF 3.889
Wei Gan,Wei Wu,Fangyuan Yang,Deping Hu,Hui Fang,Zhenggang Lan,Qunhui Yuan
By probing the electric potential at the hexadecane–water interface with second harmonic generation and the zeta potential at the surface of a hexadecane droplet in its emulsion, we show that hydronium ions don't have a specific affinity to the oil–water interface although hydroxide ions do. The observed apparent affinity of the hydronium ions to the hexadecane–water interface is more likely a result of the electro-static attraction effect. The adsorption free energy of the hydroxide ions at the oil–water interface was estimated to be −8.3 kcal mol−1. This study provides more experimental evidence for understanding the behavior of hydronium and hydoxide ions at the oil–water interface.
研究领域:
物理化学
·
界面科学
·
胶体化学
·
电化学
·
分子间相互作用
·
软物质物理
✓ 已验证
DOI
高影响因子
RARE METALS
·
2023
·Vol. 43
·期 3
·1153-1166
·
IF 8.8
Lu Li-Wen,Luo Hui,Li Guang-Xu,Li Yun,Wang Xin-Hua,Huang Cun-Ke,Lan Zhi-Qiang,Zhou Wen-Zheng,Guo Jin,Ismail Mohammad,Liu Hai-Zhen
The Li-Mg-B-H composite (2LiBH 4 + MgH 2 ) has a high capacity of 11.4 wt% as a hydrogen storage material. However, the slow kinetics and poor cycling stability severely restrict its practical applications. In this work, a layered Nb 2 C MXene was first synthesized and then introduced to tailor the kinetics and cycling stability of the Li-Mg-B-H composite. The milled 2LiH + MgB 2 composites were initially hydrogenated to obtain the 2LiBH 4 + MgH 2 composites. The 2LiBH 4 + MgH 2 + 5 wt% Nb 2 C can release 9.0 wt% H 2 in 30 min at 400 °C, while it is only 2.7 wt% for the undoped 2LiBH 4 + MgH 2 . The dehydrogenation activation energies of MgH 2 and LiBH 4 are 123 and 154 kJ·mol −1 respectively for the 5 wt% Nb 2 C-doped composite, lower than the undoped composite (164 and 165 kJ·mol −1 ). The 2LiBH 4 + MgH 2 + 5 wt% Nb 2 C possesses excellent cycling stability, with the reversible capacity only slightly reduced from 9.4 wt% for the 1st cycle to 9.3 wt% for the 20th cycle. Nb 2 C keeps stable in the composite and acts as an efficient catalyst for the Li-Mg-B-H composite. It is believed that both the layered structure and the active Nb element contribute to the enhanced hydrogen storage performances of the Li-Mg-B-H composite. This work confirms that the Nb 2 C MXene with layered structure has a significant enhancing impact on the Li-Mg-B-H hydrogen storage materials, which is different from the bulk NbC. Graphical abstract
研究领域:
材料科学
·
能源化学
·
纳米催化
·
储氢技术
·
固体化学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2020
·
IF 6.71
Lei Meng,Chen He,Wei Ji,Fei Yen
We observe sharp step-down discontinuities in the magnetic susceptibility of NH4H2PO4 and NH4H2PO4-d60 (60% deuterated) along the a- and c-axes occurring exactly at their antiferroelectric transition temperatures. For the case of KH2PO4, less pronounced discontinuities occur at the ferroelectric transition temperature. To explain this, we treat the acid protons as individual oscillators that generate current elements that translate to magnetic forces in near resonance with each other. With decreasing temperature, the resonant forces become more commensurate, which amplifies a disproportionate drop off of two types of magnetic forces to eventually trigger the structural phase transitions. For the case of NH4H2PO4, the associated internal magnetic field appears to aid the NH4+ to order at a higher temperature. At 49 K, a shoulder-like anomaly in both NH4H2PO4 and KH2PO4 is attributed to a possible onset of macroscopic quantum tunneling of protons. Our findings bring forth a new category of intrinsic multiferroic systems.
研究领域:
凝聚态物理
·
材料科学
·
固态物理
·
磁学
·
铁电学
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2017
·
IF 0
Jianmei Wang,Xiao Ma,Tingting Liu,Danni Liu,Shuai Hao,Gu Du,Rongmei Kong,Abdullah M. Asiri,Xuping Sun
The sluggish kinetics of water oxidation has severely hindered the energetic convenience of electrochemical water splitting. In this work, we describe our recent finding that NiS 2 nanosheet array on Ti mesh (NiS 2 /TiM) is a superior catalyst for hydrazine oxidation reaction (HzOR) with the demand of potential of 218 mV to drive 300 mA cm −2 in 1.0 M KOH with 0.5 M hydrazine. Interestingly, its high activity toward hydrogen evolution reaction enables it as a bifunctional catalyst for energy-efficient electrolytic hydrogen generation, and the two-electrode alkaline electrolyzer using NiS 2 /TiM as both anode for HzOR and cathode for HER needs a cell voltage of only 0.59 V to attain 50 mA cm −2 , 1.34 V less compared with pure water splitting to achieve the same current density, promising the use of such 3D catalyst electrode toward energy-saving electrochemical production of hydrogen fuels .
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Pengfei Zhao,Fulong Pu,Changsheng Su,Yefan Wan,Texin Huang,Xuedan Hou,Di Cai
Deep eutectic solvents (DESs) offer a potential opportunity in biomass utilization industries. This work emphasized the impact of hydrogen bond donors (HBD) and acceptors (HBA) on deconstruction and valorization of rice straw. Acidity, alkyl chain length, hydrogen bonding ability and functional groups of HBD and HBA appeared to be important factors affecting the fractionated pulps and lignins, which further influenced ethanol fermentation. Among the candidate DESs, lactic acid/guanidine hydrochloride (LGH) was proved to be the most suitable one due to the excellent delignification and xylan removal. For the downstream fermentation process, 0.47 g g −1 of bioethanol with 0.55 g/L h −1 of productivity can be obtained from the LGH pulp’s hydrolysate. Mass balance showed 302.8 g bioethanol and 119.0 g technical lignin can be co-generated from 1 kg dried rice straw. This “green” valorization strategy offers a promising scheme in biorefinery of lignocelluloses.
研究领域:
生物技术
·
化学工程
·
可再生能源
·
可持续化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）