RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 5
·3455-3474
·
IF 1.674
Sun Xiao,Guo Rui-tang,Li Ming-yuan,Sun Peng,Pan Wei-guo,Liu Shu-ming,Liu Jian,Liu Shuai-wei
Fe was used as the modifier to improve the performance of CeZr 2 O
x
catalyst for the selective catalytic reduction (SCR) reaction with ammonia. Experimental results revealed that proper Fe species (Fe/Ce molar ratio = 2) could effectively improve the SCR activity of CeZr 2 O
x
, along with the elevated resistance to SO 2 and H 2 O. The characterization results including BET, XRD, H 2 -TPR and NH 3 -TPD confirmed that Fe species in Fe 2 CeZr 2 O
x
catalyst could inhibit the formation of ZrO 2 crystals and lead to higher reducibility and surface acidity. In addition, more Ce 3+ and surface active oxygen species could be detected on Fe 2 CeZr 2 O
x
compared with CeZr 2 O
x
. By means of in situ DRIFT technique, it could be deduced that the SCR reaction process over Fe 2 CeZr 2 O
x
was accelerated mainly through theL–H pathway due to the advanced adsorption of NH 3 and NO
x
species, along with the promoted NO conversion to NO 2 . Therefore, the modification of CeZrO
x
catalyst by Fe had a significant stimulation effect on its low-temperature SCR performance.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuying Zhao,Fengming Zhou,Qiuyue Liang,Bo Zhang,Peng Wang,Qingliang Lv,Caixia Li,Zhenyu Xiao,Lei Wang
Although the intrinsic layer structure of layered double hydroxide (LDH) is beneficial for more accessible active centers and faster electrolyte ions diffusion rate than closed-packed atom arrangement for achieving higher capacitance, the narrow interlaminar spacing results in inevitable “death volume” during the rapid charging-discharging process. Herein, an electrochemical assistant MOF etching strategy is developed to construct hierarchical porous LDH with pre-embed OH − ions and filled H 2 O molecule in inter-layer space (E-MOF-0.5 V) for unsealing theoretical capacity. According to the valence equilibrium theory, the increased valence of the metal center during electrochemical polarization can accelerate the filling of OH − ions and H 2 O molecules in the LDH inter-layer space. The involved OH − and water molecules can achieve rapid mass transfer processes through ‘‘Newton’s Cradle’’ and the rich pore and ultra-thin layer structure may make sure the active centers are almost completely accessible. Therefore, the optimized E-MOF-0.5 V delivers an outstanding specific capacity of 8547.2 mF cm −2 (2670.9 F g −1 ) at 4 mA cm −2 and maintains an excellent cycling performance of 88 % after 7200 cycles at 20 mA cm −2 . Besides, an E-MOF-0.5 V//rGO-Zn hybrid supercapacitor device is assembled, which presents an energy density of 7.97 mWh cm −2 and a power density of 6.63 mW cm −2 .
研究领域:
材料科学
·
电化学
·
纳米结构
·
储能
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Jingyun Huang,Qingning Zuo,Xiaoliang Wang,Xiaoping Bai,Qiming Wei,Junnan Zhang,Xiaoshuang Geng,Zitao Yan,Zhen Li,Bo Yang,Lu Li
The real-time detection of gaseous H 2 O and its typical isotopic molecules, e.g., H 2 18 O, D 2 O, HDO, and HTO, is highly desirable in many fundamental scientific studies and practical monitoring, such as mechanistic studies of H 2 O-involved chemical reactions and radiation risk warning of abnormal HTO emissions. However, ionization methods for mass spectrometry (MS) to directly measure isotopic water molecules are limited, and the discrimination of those with similar molecular weights (MWs) usually requires the use of high-resolution mass spectrometers. In this study, we present a highly efficient ionization method for water vapor based on a photoinduced associative ionization (PAI) reaction, where one excited-state CH 2 Cl 2 ∗ reacts with two H 2 O molecules to transfer a proton from one H 2 O molecule to another (i.e., the analyte). Benefit to the distinctive ionization pathway, different featured ions of H 2 O, D 2 O, and H 2 18 O were observed. Surprisingly, each isotopic water molecule has its own unique PAI mass spectrum pattern according to the same ionization principle, which offers a convenient method for distinguishing isotopic water molecules with similar MWs, such as D 2 O, H 2 18 O, and HTO (20 Da), without the need for high-resolution mass spectrometers. The measured detection sensitivities of a laboratory-built PAI time-of-flight mass spectrometer towards D 2 O and H 2 18 O were 1465.1 ± 37.0 and 1324.4 ± 86.4 counts ppbv −1 , respectively, in a detection time of 10 s. The corresponding 3σ LODs were 0.10 and 0.11 ppbv, respectively. This study provides a novel ionization method for the direct detection and discrimination of isotopic water molecules, which has potential to combine with portable MS for on-site measurements.
研究领域:
分析化学
·
环境科学
·
放射化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science China-Materials
·
2021
·Vol. 65
·期 3
·764-772
·
IF 8.273
Wei Jun-Hua,Luo Jian-Bin,Liao Jin-Feng,Ou Wei-Tao,Kuang Dai-Bin
Zero-dimensional metal halide perovskites have captured intense research interest owing to their unique optoelectronic properties. Particularly, metal halides with the n s 2 electronic configuration are of great interest owing to the high-temperature sensitivity of their photoluminescence, which could be applied to remote optical thermometry (ROT). Herein, all-inorganic and lead-free halide perovskite Te 4+ -doped Cs 2 InCl 5 ·H 2 O single crystals (SCs) were prepared through the hydrothermal method and showed a strong temperature dependence of photoluminescence lifetime. Upon Te 4+ doping, the nonemissive Cs 2 InCl 5 ·H 2 O SC exhibits a bright orange emission at 660 nm with a wide full width at half maximum of 180 nm. The strong phonon-exciton coupling promotes the formation of self-trapped excitons in the soft lattice of the zero-dimensional Te 4+ -doped Cs 2 InCl 5 ·H 2 O SC. The Te 4+ ions with the 5s 2 electronic configuration endow the Te 4+ -doped Cs 2 InCl 5 ·H 2 O SC with a strong temperature-dependent photoluminescence lifetime. This SC reaches a maximum specific sensitivity of 0.062K −1 at 320 K, thereby showing the potential advantages of indium-based metal halide perovskites in ROT applications.
研究领域:
材料科学
·
光学传感
·
钙钛矿光子学
·
固态化学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2017
·
IF 2.536
Cuiping Zhai,Ping Zhang,Peng Peng,Bingbing Hou,Lina Li
The interactions between nicotinamide (NA) and H 2 O were studied using UV–visible spectra (UV–Vis), cyclic voltammetry (CV), nuclear magnetic resonance (NMR), density functional theory (DFT) and atoms in molecules (AIM) analysis. According to the changes of the UV–Vis spectra and the oxidation and reduction potentials in cyclic voltammograms of NA in aqueous solution, it was found that hydrogen bonding occurred between NA and H 2 O molecules. Quantum chemistry calculations and AIM analysis further confirmed the existence of hydrogen bonding between H 2 O molecules and the amide group, the nitrogen atom , and hydrogen atoms on the pyridine ring of NA molecules. In addition, the NMR results demonstrated that the π-π stacking between NA pyridine rings could be formed at higher concentrations.
研究领域:
物理化学
·
超分子化学
·
电化学
·
量子化学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Xianzhen Xu,Yan Wang,Xiangyu Sun,Yu Zhou
Vapor–liquid equilibrium (VLE) data are measured and reported for the LiCl + CaCl2 + H2O system. The experimental procedures were carried out with pressures between 6 and 101.3 kPa in a computer-controlled glass apparatus. We obtained the relationship between solubility of salt and vapor pressure by analyzing and summarizing the results. Then, a modified NRTL model based on the hypothesis of hydration was used in this paper. By correlation of literature and experimental data for LiCl + H2O, CaCl2 + H2O, and LiCl + CaCl2 + H2O (pressure spanning from 5 to 101.3 kPa), some parameters were modified for improving the accuracy of the calculation. Meanwhile, the model was successfully applied to predict the VLE data in LiCl + CaCl2 + H2O systems with the modified binary parameters.
研究领域:
化学工程
·
热力学
·
物理化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2013
·
IF 3.473
Jinhua Wu,Weizhao Yin,Jingjing Gu,Ping Li,Xiangde Wang,Bo Yang
Batch experiment was conducted to evaluate the capability of a biotic Fe 0 –H 2 O for nitrobenzene (NB) removal from groundwater. In this study, iron dosage was 0.25 g L −1 throughout the whole experiment and the Fe 0 –H 2 O system was amended with 180 mg L −1 VSS of mixed culture. The biotic system was tested at low concentrations (50 mg L −1 as COD) of organic substrates (e.g., ethanol, glucose and sodium acetate) and different concentrations of sulfate, nitrate and dissolved oxygen. The bio-iron system exhibited higher NB removal rate and more AN production. The increasing order of efficiency of tested substrates was: glucose > sodium acetate > ethanol. A complicated enhancement from oxygen was obtained, with 100% of NB removal rate and without any AN accumulation in the solution amended by dissolved oxygen. Sulfate and nitrate functioned as inhibitors since they competed with NB for electron donors (H 2 ), and nitrate showed more significant suppression on NB removal as compared to sulfate. AN elimination occurred during both sulfate-reducing and nitrate-reducing processes and microorganisms got extra reduction capacity from the degradation of AN to reduce nitrate and sulfate, causing the mineralization of NB under anaerobic or anoxic conditions. It suggested that the bio-iron treatment could function as a simplified process for the remediation of groundwater contaminated by combined NB and sulfate, nitrate.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 32
·8770-8777
·
IF 5.976
Lixin Hou,Yali Wang,Xianhao Liu,Jia Wang,Lixin Wang,Xiaowei Li,Guangsheng Fu,Shaopeng Yang
The performance of flexible perovskite solar cells (PSCs) is largely lower than that of their glass/ITO counterparts. This is mainly due to the fact that the surface of PET/ITO is rougher than glass/ITO. ITO bulges could cause the upper perovskite crystals to deteriorate, eventually leading to a large leakage current and the low performance of devices. We reduce the leakage current of PET/ITO assembled PSCs by two measures to improve the PCE of the flexible PSCs. First, double hole transport layers of PEDOT:PSS/NiO are deposited on the surface of PET/ITO, that is, a layer of PEDOT:PSS film is first spin-coated on the ITO surface and then a layer of NiO film is evaporated above to cover the small bulges on the bare ITO. Second, the dual additives of DIO and H2O were introduced to the perovskite precursor solution to control the process of crystal formation and grain growth of the perovskite absorber, finally improving the uniformity and sizes of the perovskite crystals. In conclusion, the double hole transport layers and CH3NH3PbI3−xClx perovskites with dual additives produced a perovskite film with low roughness, high uniformity and large crystal grains on PET/ITO, finally achieving flexible PSCs with the best PCE of 18.0% and excellent flexibility. Our approach provides an effective pathway to fabricate highly efficient and large-scale flexible PSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
POLYHEDRON
·
2022
·
IF 2.975
Yan-Ling Deng,Wei Li,Chun-Yang Pan
Two new metal hybrid borates , Na[Ni(py) 2 ] 2 ·[(C 4 H 2 O 6 ) 2 B]·H 2 O (py = pyridine) ( 1 ) and [Cu(H 2 O) 2 (1-EI) 4 ]·[B 5 O 6 (OH) 4 ] 2 ·H 2 O (1-EI = 1-ethylimidazole) ( 2 ), have been successfully synthesized. 1 features an interesting structure based on mixed borate-tartrate motifs. Two tartrate anions are condensed with one BO 4 to form the hybrid anionic group [(C 4 H 2 O 6 ) 2 B] 5− . The structure of 2 is composed of [B 5 O 6 (OH) 4 ] − clusters and [Cu(H 2 O) 2 (1-EI) 4 ] 2+ complexes, which exhibits hydrogen-bonded network formed by [B 5 O 6 (OH) 4 ] − clusters. These compounds are further confirmed by FTIR, PXRD and UV–vis. In addition, the catalyst prepared from 2 shows excellent electrocatalytic oxygen reduction reaction (ORR) activity.
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2024
·
IF 4.5
Yu Zhu,Bihe Yuan,Zhezhe Tan,Zeyang Gao,Man Yang,Sining Chen
NH 3 ·H 2 O can result in severe accidents when leaking in a confined space. In this work, a novel powder-water mist synergistic strategy for decontaminating NH 3 ·H 2 O in a confined space is proposed. Initially, FeCl 3 /AlCl 3 was employed to modify diatomite, decorating its pore structure and augmenting the number of acidic adsorption sites. The modified diatomite achieves a notable efficiency of 74.6%, surpassing that of the raw diatomite (43.8%). Subsequently, surfactants were introduced to increase the contact area between the water mist and NH 3 , while a thickening agent was employed to suppress the fluidity of NH 3 ·H 2 O. Ultimately, the powder-water mist synergistic decontamination system was constructed by integrating the diatomite with a thickening agent and water mist containing surfactants. The synergistic system exhibits a superior decontamination efficiency of approximately 80%. This work generates fresh insight into decontaminating NH 3 ·H 2 O in a confined space and offers a crucial avenue for future advancements in decontamination technology.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2020
·Vol. 14
·期 5
·1471-1478
·
IF 8.183
Shao Weiwei,Li Xiaodong,Zu Xiaolong,Liang Liang,Pan Yang,Zhu Junfa,Wang Chengming,Sun Yongfu,Xie Yi
Photooxidation provides a promising strategy for removing the dominant indoor pollutant of HCHO, while the underlying photooxidation mechanism is still unclear, especially the exact role of H 2 O molecules. Herein, we utilize in-situ spectral techniques to unveil the H 2 O-mediated HCHO photooxidation mechanism. As an example, the synthetic defective Bi 2 WO 6 ultrathin sheets realize high-rate HCHO photooxidation with the assistance of H 2 O at room temperature. In-situ electron paramagnetic resonance spectroscopy demonstrates the existence of •OH radicals, possibly stemmed from H 2 O oxidation by the photoexcited holes. Synchrotron-radiation vacuum ultraviolet photoionization mass spectroscopy and H 2 18 O isotope-labeling experiment directly evidence the formed •OH radicals as the source of oxygen atoms, trigger HCHO photooxidation to produce CO 2 , while in-situ Fourier transform infrared spectroscopy discloses the HCOO* radical is the main photooxidation intermediate. Density-functional-theory calculations further reveal the •OH formation process is the rate-limiting step, strongly verifying the critical role of H 2 O in promoting HCHO photooxidation. This work first clearly uncovers the H 2 O-mediated HCHO photooxidation mechanism, holding promise for high-efficiency indoor HCHO removal at ambient conditions.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 11
·5243-5250
·
IF 2.961
Liu Min,Zhang Qiang,Gao Jianxin,Liu Qianfeng,Wang Erdong,Wang Zhenbo
Mg-air battery is a promising electrochemical system for high-energy–density, long storage application. However, its commercialization is hindered by the low anode utilization rate mainly caused by the serious hydrogen evolution reaction (HER) in traditional NaCl aqueous electrolyte. Herein, we report NaBF 4 -dimethyl sulfoxide (DMSO)/NaCl-H 2 O biphasic electrolytes to alleviate the anode HER corrosion by allowing anodic reaction to take place in organic solution DMSO while ensuring high cathode activity with applying cathode reaction to occur in NaCl-H 2 O solution. The discharge results show that its utilization rate of AZ61 alloy in NaBF 4 -DMSO/NaCl-H 2 O biphasic electrolytes is increased to 67% at 1 mA cm −2 which is 17% higher than in NaCl-H 2 O single electrolyte, and the anode energy density is up to 2020 Wh kg −1 . In addition, even at 15 mA cm −2 , its discharge voltage is still up to 1.02 V which is higher than that in similar literatures using organic electrolytes for Mg anode.
研究领域:
电化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）