APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Erbing Hua,Shu Jin,Xiaorong Wang,Shuang Ni,Gang Liu,Xiaoxiang Xu
In this work, novel 2D type-II p-n heterojunctions La 2 Ti 2 O 7 /In 2 S 3 have been fabricated. The heterojunctions exhibit much improved photocatalytic activity over individual moieties and their physical mixtures in which 18-fold increment in hydrogen production has been achieved under visible light illumination (λ ≥ 400 nm). Their superior activities stem from intimate face-to-face contact between La 2 Ti 2 O 7 and In 2 S 3 in the heterojunctions which guarantee facile charge interchange. Photoelectrochemical analysis suggests that efficient charge separations occur at the interfaces of the heterojunctions and contributes to a prolonged charge lifetime as well as the much enhanced photocatalytic activities. Such a simple strategy by fabricating ultrathin type-II p-n heterojunctions also warrant promising applications in other areas such as optoelectronics, sensors etc. whereby efficient charge separations are needed.
研究领域:
材料化学
·
光催化
·
纳米材料
·
能源科学
·
半导体物理
·
环境催化
·
可持续能源
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2011
·
IF 2.089
Lingling Zhang,Yongsheng Guo,Juan Xiao,Xianjie Gong,Wenjun Fang
Densities and viscosities were determined over the whole composition range for the binary mixtures of exo-tetrahydrodicyclopentadiene with n-nonane, n-dodecane, or n-tridecane at different temperatures (293.15, 298.15, 303.15, and 313.15) K and atmospheric pressure. The excess molar volumes VmE for the mixtures were calculated from the experimental data. The refractive index and surface tension of the systems were also measured for temperatures of (293.15 and 303.15) K.
研究领域:
物理化学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Lulu Yan,Yahe Zhang,Hongyu Yan,Yu Fan,Xuxia Liu,Chao Ma,Quan Shi
CS2/N-methyl-2-pyrrolidone (NMP) could extract much more substance from coals than any other solvents. Investigation on the molecular composition of CS2/NMP extracts from lignite is significant for the understanding of high extraction yield and the clean utilization of coal. The methanol-soluble portions from lignites and CS2/NMP extracts of lignites were characterized by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. The yield of CS2/NMP extracts from lignite was quite higher than that of methanol extracts. Furthermore, the yield of methanol-soluble portions from CS2/NMP extracts was far more than that of methanol extracts from lignite. At the level of molecular composition, the relative content of heteroatom compounds with more oxygen atoms, longer side chain, and higher condensation in the CS2/NMP extract was also higher than that in the methanol extract. Despite great difference in the yield and the relative content of components, the distributions of species, molecular weight, carbon number, and double-bond equivalent were similar to those of most organic molecules for the methanol extract and methanol-soluble portions from the CS2/NMP extract. These phenomena suggested that organic molecules with similar structure but different composition, nonuniformly distributed in the coal matrix, were released more in the CS2/NMP extract compared to the single methanol extract.
研究领域:
能源化学
·
分析化学
✓ 已验证
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 11
·3039-3047
·
IF 3.146
Zhang Pan,Zhao Yuetong,Tian Xiangfeng,Ji Yanxi,Shu Yuxuan,Fu Kun,Fu Dong,Wang Lemeng
Tetramethylammonium glycine ([N 1111 ][Gly]) can be completely ionized into cation [N 1111 ] + and anion [Gly] - in aqueous solution. The anion contains an amino -NH 2 and a carboxyl -COO - , both of which can react with hydrogen sulfide (H 2 S). Therefore, [N 1111 ][Gly] was used to promote the selective absorption of H 2 S in coke oven gas (COG) by N-methyldiethanolamine (MDEA). The absorption performance and selectivity of H 2 S in the aqueous solution of MDEA-[N 1111 ][Gly] were investigated. The effects of MDEA mass fraction, [N 1111 ][Gly] mass fraction, temperature, H 2 S partial pressure and CO 2 partial pressure on the absorption capacity and selectivity were clarified. The results showed that an aqueous solution of MDEA-[N 1111 ][Gly] has good selectivity for H 2 S in COG. The absorption capacity was large and the mass fraction of the solute in the absorbent reached more than 0.55, thereby having outstanding advantages in the aspects of saving energy consumption and operating cost and having a good application potential.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Peiyuan Mao,Yong Wang,Pandeng Xiao,Wen Zhang,Shun Rao,Zhi Wang
Herein, we demonstrate the reasonable design and preparation of yolk-heteroshell Sn@N-doped C@MoS 2 nanospheres as anode materials in sodium-ion battery. Through an effective multi-step strategy, Sn nanoparticles are encapsulated in N-doped C nanocage surrounded by ultra-thin MoS 2 nanosheets to form Sn@N-doped C@MoS 2 nanospheres. In this novel structure, Sn nanoparticles with high theoretical capacity improve the space utilization inside the heteroshell; the N-doped carbon nanocage as the skeleton not only inhibits the mutual accumulation of Sn and MoS 2 , but also improves conductivity; the outer MoS 2 ultra-thin sheets can consolidate C@MoS 2 heteroshell, provide numerous active sites and favor the fast diffusion of Na + /e - . Notably, the combination of carbon nanocage and MoS 2 sheets in the yolk-heteroshell structure can effectually buffer the volume expansion of Sn nanoyolks and reinforce C@MoS 2 heteroshell while reducing the carbon content. Therefore, the yolk-heteroshell structure plays a crucial role in enhanced reversible capacity and cyclic stability of Sn@N-doped C@MoS 2 nanospheres, which activates their sodium storage potential. The yolk-heteroshell Sn@N-doped C@MoS 2 nanospheres exhibit high reversible capacity of 488.4 mAh g −1 at 0.1 A g −1 after 300 cycles and long-cycle stability of 350.6 mAh g −1 at 0.5 A g −1 after 500 cycles. Moreover, their full cell delivers a stable reversible discharge capacity of about 80.1 mAh g −1 after 30 cycles at 0.5 C. This work provides a feasible yolk-heteroshell strategy for Sn-based composite nanomaterials .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2024
·
IF 2.4
Li Jingzhe,Zhang Jiaxin,Ling Yikai,Long Min,Tian Rui,Liang Ti,Nong Guangzai
Pt counter electrodes are essential components of dye-sensitized solar cells (DSSCs). However, their high cost and poor stability limit the development of these cells. In the quest for alternative materials to replace Pt, this study utilized sodium lignosulfonate as the primary raw material and successfully prepared N, S co-doped hierarchical porous carbon by adjusting the ratio of thiourea. This carbon was then fabricated into a counter electrode to replace Pt. The results showed that the N, S co-doped hierarchical porous carbon exhibited superior electrochemical performance compared to single-atom doped carbon. When used as the counter electrode in DSSCs, it achieved a power conversion efficiency of 8.62%, which is higher than the 7.98% efficiency of Pt. Furthermore, it demonstrated greater stability than Pt in stability tests. These findings confirm that N, S co-doped hierarchical porous carbon could replace Pt, thereby advancing the scientific understanding of DSSCs and promoting their application and development. Graphical Abstract
研究领域:
材料科学
·
能源材料
·
太阳能电池
✓ 已验证
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Dangcheng Su,Yuanhua Xiao,Yingliang Liu,Shengang Xu,Shaoming Fang,Shaokui Cao,Xuezhao Wang
2D MXenes (transition metal carbides, Ti 3 C 2 T x ) with large surface area and metallic conductivity are widely used as supporters in catalysts. Unfortunately, the single MXene sheets would deteriorate in the presence of oxygen and water, which is almost the same as the environment of oxygen reduction reaction (ORR). Herein, an “armor” was constructed to encapsulate the oxidizable MXene by a confined in-situ oxidative polymerization strategy, employing the electrostatic interaction between the exfoliated MXene sheets (negatively charged) and oxidant (Fe 3+ , positively charged). The ultra-dispersed binary Fe 3 N and Co sits coupled with the large surface area MXene supporter synergy to endow more exposed active sites, meanwhile, the density functional theory (DFT) studies reveal that a moderate binding strength between the intermediates and the binary active sites was effectively modulated to enhance the ORR performance. The synthesized Fe 3 N/Co–N–C@MXene exhibits an impressive half-wave potential (E 1/2 , 0.871V) and a lower Tafel slope of 52.56 mV dec −1 than that of Pt–C-20% (74.89 mV dec −1 ). The Fe 3 N/Co–N–C@MXene based ZAB exhibits a four times higher peak power density (189.16 mW cm −2 ) than the Pt–C-20% based ZABs and superior cycle stability within 320 h. Furthermore, the assembled flexible ZABs shows high flexibility and stability in different bending scenarios.
研究领域:
材料科学
·
电化学
·
纳米催化
·
能源存储与转换
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Xiaomeng Chu,Haoxi Zhang,Cuizhi Zhang,Runan Shao,Zitong Huang,Hongfu Lv,Shaojie Liu,Lei Liu,Nanwen Li,Song Zhao
Selecting appropriate polymer backbones is crucial for the advancement of anion exchange membranes (AEMs) that exhibit both high ionic conductivity and robust chemical stability. In this study, we synthesized rigid and chemically inert aryl-ether-free polyphenylene-based polymer backbones containing alkaline-resistant N-cyclic cations, i.e. dimethyl piperidinium (DMP) or 6-azonia-spiro[5.5]undecane (ASU), as high-performance AEMs. The procedure encompassed several key steps: superacid-catalyzed Friedel-Crafts polycondensation, bromomethylation, azidation, and Cu(I)-mediated azide-alkyne cycloaddition. The synthesized BP-ASU(DMP)-x copolymers demonstrated excellent film-forming capabilities to afford robust AEMs as compared to polyolefin-based counterparts. Owing to the significant incompatibility between the hydrophobic backbones and the hydrophilic cations, the BP-ASU(DMP)-x membranes exhibited a well-defined microphase-separated morphology, resulting in exceptionally high hydroxide conductivity, up to 157.2 mS cm −1 at 80 °C in water. More importantly, BP-ASU-150 membrane exhibited no chemical degradation and a conductivity retention of >97 % when immersed in 1 M NaOH solution at 80 °C for 4000 h. Compared to the poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) and polyolefin-based counterparts, the achieved outstanding alkaline stability is related to aryl-ether-free polyphenylene and alkali-stable N-cyclic cations, highlighting the importance of polymer backbones for AEM materials. Finally, all the polyphenylene-based AEMs with incorporated N-cyclic cations were assembled in single H 2 /O 2 AEMFCs, with the BP-ASU-150 membrane demonstrating a peak power density (PPD) of 860.4 mW cm −2 at a current density of 1363 mA cm −2 . We concluded that the BP-ASU(DMP) AEMs demonstrated superior performance across various metrics due to exceptional stability and robustness of polyphenylene polymers, highlighting their potential as backbones for high-performance AEM materials.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
BIOMACROMOLECULES
·
2024
·
IF 5.5
Xiao Sun,Aoting Li,Ning Li,Guonan Ji,Ziyuan Song
Heteropolypeptides bearing two or more functional side chains are promising polymeric materials for various biomedical applications. However, conventional preparation of heteropolypeptides relies on the synthesis and purification of each N-carboxyanhydride (NCA) monomer in a separate manner, which substantially increases the time and cost. Herein, we report the facile preparation of heteropolypeptides with up to 86% yield within several hours, which are obtained from a mixture of crude NCA monomers. The combination of n-hexane precipitation and biphasic segregation effectively removed >90% impurities from crude NCA mixtures, allowing for the successful polymerization process. Various heteropolypeptides with monomodal distribution and narrow dispersity were efficiently prepared, whose compositions were predetermined by the feeding ratios of amino acids. We believe that this work significantly simplifies the preparation of various heteropolypeptides, boosting the downstream studies of these promising materials.
研究领域:
高分子科学
·
材料科学
·
生物技术
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Hualin Jiang,Jun Liu,Menglin Li,Lei Tian,Gongsheng Ding,Pinghua Chen,Xubiao Luo
Lattice-doping and surface decoration are prospective routes to improve the visible-light photocatalytic ability of TiO 2 , but the two techniques are difficult to combine into one preparation process because they are usually conducted under different conditions, which limits the efficiency of TiO 2 modification. In this study, TiO 2 was successfully modified by simultaneous lattice-doping and surface decoration, and the visible-light photocatalytic capacity was largely improved. Upon comparing the method reported here with previous ones, the most significant difference is that Fe(II)-phenanthroline was first used as the co-precursor of the introduced elements of C, N, and Fe. These three elements were simultaneously introduced to TiO 2 at high levels by this co-precursor method. The as-synthesized photocatalysts were systemically investigated and analyzed by several characterization methods such as XRD , FT-IR, XPS , Raman spectroscopy , EPR , UV-Vis DRS, photoluminescence spectra, photocurrent , electrochemical impedance spectra, TEM, and HRTEM . The photocatalytic degradation of 4-NP under visible-light irradiation was used to evaluate the photocatalytic activity of the photocatalysts. Based on the experimental data, a probable mechanism for the photocatalytic degradation by the photocatalysts is proposed. This is a novel method of using one source to simultaneously introduce metal and non-metal elements to TiO 2 at high levels, which may provide a new way to prepare highly effective TiO 2 photocatalysts.
研究领域:
材料科学
·
环境化学
·
纳米技术
·
光催化
·
无机合成
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Pengfei Tian,Jianbing Zang,Shiwei Song,Shuyu Zhou,Hongwei Gao,Hanqing Xu,Xueqing Tian,Yanhui Wang
A novel in situ templates etching method is used to prepare three-dimensional (3D) interconnected Fe-N doped hierarchical porous carbon materials. Citric acid serves as a carbon source and etchant. Fe 2 O 3 nanoparticles not only provide the iron source by in situ etching but also act as templates to construct the hierarchical porous structure. The prepared optimal sample displays a high specific surface area of 1643.6 m 2 g −1 with an interconnected abundant hierarchical porous structure and homogeneous distribution of Fe and N elements in the carbon. The optimized sample displays excellent catalytic oxygen reduction reaction (ORR) performance with a positive half-wave potential (0.85 V), efficient four-electron reaction and excellent durability, which are superior to those of Pt/C (20 wt%) catalyst. Meanwhile, due to the unique interconnected hierarchical porous structure, it also exhibits a high specific capacitance of 378.6 F g −1 at 0.5 A g −1 and an excellent rate capability of 276.6 F g −1 at 20 A g −1 as supercapacitors electrode materials in 6 M KOH. This work provides a simple design for the preparation of 3 D interconnected Fe-N doped hierarchical porous carbon electrode materials that display potential applications in ORR catalysts and supercapacitors.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2019
·Vol. 11
·期 3
·418-424
·
IF 1.158
Lv Yao,Huang Shifei,Zhao Yufeng
The N-B-F tridoping 3D hierarchical porous graphitized carbon network is produced by a one-step synthesis using chitosan as a precursor. The N-B-F tridoping 3D hierarchical porous graphitized carbon network is rich of nitrogen, boron and fluorine hetero atoms and exhibited relatively
high specific capacitance value of 316 F g–1 in 6 M KOH at a current density of 20.0 A g–1. As well as good cycling stability with capacitance retention of 100% over 10000 cycles, and good rate performance (90.3% capacity retention from 0.5 A g–1
to 20.0 A g–1). When used as supercapacitor electrode, the all carbon symmetric supercapacitor based on N-B-F tridoping 3D hierarchical porous graphitized carbon network delivers a high energy density of 23.87 Wh kg–1, outperforming the state-of-the-art carbon
material.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）