ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Zhilin Zhang,Guangzhi He,Yaobin Li,Changbin Zhang,Jinzhu Ma,Hong He
Pt/Al2O3 catalysts showing excellent activity and stability have been used in various reactions, including HCHO oxidation. Herein, we prepared Pt–Na/Al2O3 catalysts with a Pt content of 0.05 wt % to reveal the key factors determining the anchoring of Pt as well as the catalytic activity and mechanism of HCHO oxidation. Pt–Na/nano-Al2O3 (denoted as Pt–Na/nAl2O3) catalysts with 0.05 wt % Pt content could completely oxidize HCHO to CO2 at room temperature, which is the lowest Pt content used in HCHO catalytic oxidation to our knowledge. After Na addition, terminal hydroxyl groups (denoted as HO-μter) on nano-Al2O3 were transformed to doubly bridging hydroxyl groups between Na and Al (denoted as HO-μbri(Na–Al)), which atomically dispersed Pt species. Pt anchoring further promoted the regeneration of HO-μbri(Na–Al) by activating O2 and H2O, oxidizing HCHO to CO2 directly by the fast reaction step ([HCOO–] + [OH]a → CO2 + H2O). Our study revealed that the HO-μbri(Na–Al) synergistically generated by HO-μter and Na species provided anchoring sites for Pt species.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 20
·3749-3761
·
IF 3.756
Mengya Li,Dandan Han,Junbo Gong
Uric acid (UA) is the end product of purine metabolism and is widely found in nature. Excess uric acid will result in the deposition of pathological uric acid crystals in the kidney. However, few studies have focused on the effects of components in the human body on the crystallization of uric acid. Herein, we found multiple effects of alkali metals (Na+, K+) on uric acid dihydrate (UAD) crystal growth, which is one of the main components of urinary stones. Optical microscopy (OM) and scanning electron microscopy (SEM) were employed to detect the crystal morphology, and long rod-like crystals and hierarchical crystals were found in the presence of Na+ and K+, respectively. Powder X-ray diffraction (PXRD) and micro-Raman spectroscopy verified that the crystal structure remained unchanged in the presence of ions. In addition, single-crystal growth experiments revealed that Na+ inhibited growth along [010] and [100], and K+ promoted growth along [100] but suppressed growth along [010]. The step growth of the UAD crystal was measured by atomic force microscopy (AFM), which indicated the inhibition of crystal growth by Na+ due to kink blocking, yet the promotion of crystal growth by K+ resulted from rough growth. Our studies showed that ions in the human body not only can maintain electrolyte balance but also can affect the crystallization of pathological crystals, which provides a suggestion for a rational diet for patients with hyperuricemia and urinary stones.
研究领域:
生物化学
·
医学
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Fei Li,Yuxin Liu,Yang Liu,Yanjun Li,Hongbo Yu
Lytic polysaccharide monooxygenases could enhance the enzymatic conversion of recalcitrant polysaccharides by glycoside hydrolases. This study reports the expression and identification of a novel AA10 LPMO from Natrialbaceae archaeon , named Na LPMO10A, as a C1 oxidizer of chitin. The optimal temperature and pH for Na LPMO10A activity were 40 °C and 9.0, respectively, and Na LPMO10A exhibited high thermostability and pH stability under alkaline conditions. Na LPMO10A was also highly tolerant and stable when treated with high concentration of metal ions (1 M). Moreover, metal ions (Na + , K + , Ca 2+ and Mg 2+ ) significantly promoted Na LPMO10A activity and improved the saccharification efficiency of chitin by 22.6%, 45.9%, 36.7% and 53.9%, respectively, compared to commercial chitinase alone. Together, the findings of this study fill a gap in archaeal LPMO research, and for the first time demonstrate that archaeal Na LPMO10A could be a promising enzyme for improving saccharification under extreme condition, with potential applications in biorefineries.
研究领域:
生物化学
·
酶工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Zhonghui Gao,Jiayi Yang,Haiyang Yuan,Haoyu Fu,Yutao Li,Yuyu Li,Thimo Ferber,Conrad Guhl,Huabin Sun,Wolfram Jaegermann,René Hausbrand,Yunhui Huang
Most Li+/Na+-conducting solid electrolytes are unstable in moisture, and the formed hydroxides and carbonates on their surfaces result in the increase of the interfacial resistance between solid electrolytes and alkali metal anodes. In this study, heat treatment was used to remove the byproduct coating on the surface of Na3Zr2Si2PO12 (NZSP) that also leads to the generation of Na-ion deficient surface simultaneously. This surface chemistry approach was used to reduce the interfacial resistance and suppress Na-dendrite growth during Na plating. A combination of the metallic Na wetting test, density functional theory, and electrochemical measurement was employed to investigate the origins of ultralow interfacial resistance and mechanism between the Na-ion deficient surface and the metallic Na anode. The analysis demonstrates that the Na-ion-deficient surface effectively improves the contact between NZSP and the metallic Na anode. Moreover, an ultrathin passivating layer involving Na2O was formed between NZSP with metallic Na that protected the NZSP electrolyte from the reduction by metallic Na. This study not only motivates the need for further understanding of the surface chemistry of NZSP but also provides guidelines for the future design of the Na-ion solid–electrolyte interface.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Zhi-Cai Xing,Su-Zhen Liu,Guo-Qin Zhang,Yang Zou,Li-Feng Wang,Xiao-Ming Ren
Besides of applications in the battery, fast Na + -ion conductors have important applications in electrochemical sensors , electrochromic devices , and oxygen separation membranes . However, investigations on room-temperature solid-state Na + -ion conducting materials were scarcely reported. A Na-rich metal hexacyanoferrate (Na–FeHCF) was synthesized via a facile precipitation method and characterized by EA (Elemental Analysis), ICP (Inductively Coupled Plasma spectrometer), IR (Infrared Spectroscopy), TGA (Thermogravimetric Analysis), PXRD (Powder X-ray Diffraction), and water sorption/desorption. Na–FeHCF exhibits water-mediated ion conductivity. The Na + -ion conductivity (σ) of Na–FeHCF is 1.27 × 10 −8 S cm −1 under anhydrous condition, and it increased to 2.52 × 10 −3 S cm −1 at 98% RH (relative humidity). As a room-temperature ion conductor, its application as an impedance moisture detecting device has been explored. Na–FeHCF coating with poly(vinylidene fluoride) film on interdigital electrodes exhibited good linearity, nice repeatability, small hysteresis, short response and recovery time.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 3
·282
·
IF 2.881
Jun Fang,Wenting Liu,Wenying Zhou,Cheng Zhu,Yaru Ni,Liang Fang,Chunhua Lu
Spectral adjustment is an effective method to increase light conversion efficiency of solar cells and to promote the growth of plants. Down-converter (DC) materials are considered to be one of the most effective methods of spectral modification. The focus of this work was to expand the spectral response range of down-conversion layers to achieve multipeak absorption and emission. Sr2CaMoO6:Sm,Na and YVO4:Bi,Eu, which have different excitation peaks in the UV-blue region and varied emission peaks in visible light regions, were prepared in this work. Sr2CaMoO6:Sm,Na can effectively produce red light at 648 nm upon excitation at 408 nm, while YVO4:Bi,Eu can produce red light at 618 nm upon excitation at 365 nm. Polymeric luminescent coatings with one single kind of phosphor were prepared separately before the two phosphors were mixed together in uniform polymer coatings. The two phosphors were also assembled in bilayer coatings with different concentrations. The results showed that high transmittances over 90% were achieved for the two composite coatings with the thickness of 20 and 30 μm. The increase in particle loadings from 1‰ to 4‰ slightly decreased coating transmittance but increased luminescence intensity. The increase in the ratio of Sr2CaMoO6:Sm,Na and YVO4:Bi,Eu from 5/1 to 10/1 resulted in high transmittance of the DC coatings, independent of total filler loadings (3‰ and 4‰) and coating thickness. The relative intensities of emission peaks can be adjusted conveniently by changing filler ratios. In addition, the transmittance and luminescent intensities of the coatings where the two phosphors were assembled in two layers were close to the uniform coatings, suggesting the negligible effect of UV light irradiation order. This work proved that the prepared coatings presented multipeak absorption and emission upon UV light excitation. These coatings can be expected to be applied in fields such as solar cells and agriculture greenhouses.Keywords:Sr2CaMoO6:Sm,Na;YVO4:Bi,Eu;polymeric luminescent coatings;down-conversion
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Inorganics
·
2025
·Vol. 13
·期 8
·261
·
IF 3
Zebin Song,Hao Zhou,Yin Zhang,Haining Ji,Liping Wang,Xiaobin Niu,Jian Gao
The O3-type layered oxide materials have the advantage of high specific capacity, which makes them more competitive in the practical application of cathode materials for sodium-ion batteries (SIBs). However, the existing reported O3-type layered oxide materials still have a complex irreversible phase transition phenomenon, and the cycle life of batteries needs, with these materials, to be further improved to meet the requirements. Herein, we performed structural characterization and electrochemical performance tests on O3-NaNi0.6−xFe0.25Mn0.15MgxO2(x = 0, 0.025, 0.05, and 0.075, denoted as NFM, NFM-2.5Mg, NFM-5.0Mg, and NFM-7.5Mg). The optimized NFM-2.5Mg has the largest sodium layer spacing, which can effectively enhance the transmission rate of sodium ions. Therefore, the reversible specific capacity can reach approximately 148.1 mAh g−1at 0.2C, and it can even achieve a capacity retention of 85.4% after 100 cycles at 1C, demonstrating excellent cycle stability. Moreover, at a low temperature of 0 °C, it also can keep capacity retention of 86.6% after 150 cycles at 1C. This study provides a view on the cycling performance improvement of sodium-ion layered oxide cathodes with a high theoretical specific capacity.
研究领域:
材料科学
·
电化学
·
储能技术
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Central Science
·
2021
·
IF 14.553
Xizheng Liu,Xiaofeng Lei,Yong-Gang Wang,Yi Ding
Rechargeable Na–air batteries (NABs) based on abundant Na resources are generating great interest due to their high energy density and low cost. However, Na anode corrosion in ambient air and the growth of abnormal dendrites lead to insufficient cycle performance and safety hazards. Effectively protecting the Na anode from corrosion and inducing the uniform Na plating and stripping are therefore of vital importance for practical application. We herein report a NAB with in situ formed gel electrolyte and Na anode with trace residual Li. The gel electrolyte is obtained within cells through cross-linking Li ethylenediamine at the anode surface with tetraethylene glycol dimethyl ether (G4) from the liquid electrolyte. The gel can effectively prevent H2O and O2 crossover, thus delaying Na anode corrosion and electrolyte decomposition. Na dendrite growth was suppressed by the electrostatic shield effect of Li+ from the modified Li layer. Benefiting from these improvements, the NAB achieves a robust cycle performance over 2000 h in opened ambient air, which is superior to previous results. Gelation of the electrolyte prevents liquid leakage during battery bending, facilitating greater cell flexibility, which could lead to the development of NABs suitable for wearable electronic devices in ambient air.
研究领域:
储能
·
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Bizhe Su,Hanqin Liang,Xiaohui Zhao,Tao Zhang,Yu Zhou,Denis Y.W. Yu
Two sodium-rich transition metal (TM) oxides with the same spinel structure, Na 2 MoO 4 and Na 2 WO 4 have been investigated as cathode materials for Na-ion batteries for the first time. Although the oxidation state of TMs in the compounds are already at its highest value of 6+, both of them can be activated by anionic redox reaction during initial charge, as revealed by X-ray photoelectron spectroscopy, to give considerable reversible capacity between 1.2 and 4.7 V. In addition, ex-situ X-ray diffractometry (XRD) shows that both cathode materials undergo insignificant structural evolution during Na extraction/insertion, suggesting that the Mo-O 4 and W-O 4 tetrahedral framework are stable even when more than 1 Na is removed from the materials. Overall, Na 2 WO 4 shows larger amount of Na extraction/insertion and better cycle stability than Na 2 MoO 4 . This is likely due to better structural integrity and better stability of Na 2 WO 4 against oxygen loss from ex-situ XRD and differential electrochemical mass spectrometry results.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Lijue Yan,Xinyu Li,Huilin Pan
Na-ion batteries (NIBs) hold promise as a leading option for large-scale energy storage. However, their development faces challenges due to the lack of high-performance cathode materials. P2-type layered oxides are seen as potential cathode materials for NIBs due to higher structure stability, yet their commercialization is hindered by limited capacity and subpar phase transitions during Na extraction and insertion at high voltages. In this study, we introduce a new P2-type cathode material, Na0.76Ni0.23Li0.1Ti0.02Mn0.65O1.998F0.02 (NLTMOF), synthesized with ternary Li/Ti/F substitution. This modification of ternary Li/Ti/F substitution significantly tailors the electronic structures, increasing the number of valence electrons near the Fermi energy level. This facilitates the electronic conductivity and their involvement in charge compensation, thereby enhancing reversible capacity. Additionally, ternary doping synergistically adjusts the Na occupancy at the Na layer for favorable Na extraction without P2–O2 phase transitions even under a high voltage of 4.4 V, boosting cycling stability. As a result, NLTMOF demonstrates a reversible capacity of 110.0 and 132.2 mAh g–1 at 2–4.2 and 2–4.4 V, respectively, and maintains greatly enhanced cycling stability over long cycles. This study sheds light on the design of transition metal oxides for advanced cathode materials through the modulation of electronic structure and Na occupancy in cathode materials, thus promoting the development of NIBs.
研究领域:
材料科学
·
储能
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bingbing Chen,Aihu Feng,Kun Liu,Jiao Wu,Yun Yu,Lixin Song
Ti 3 C 2 T x is a promising intercalation-type electrode material for capacitive deionization (CDI). However, Ti 3 C 2 T x , obtained from traditional synthesized Ti 3 AlC 2 , is with large particle size and undersized interlayer space, which can easily lead to the longer ion diffusion path, fewer adsorption sites, and higher ion diffusion barrier in CDI process. In this work, subsize and Na + intercalated Ti 3 C 2 T x (Na + -Ti 3 C 2 T x -MS) was prepared by HF etching KCl-assisted molten-salt synthesized Ti 3 AlC 2 and following NaOH treatment. The Na + -Ti 3 C 2 T x -MS achieves a high electrosorption capacity of 14.8 mg/g and a high charge efficiency of 0.81 at the applied voltage of 1.2 V in 100 mg/L NaCl solution. Besides, the stable desalination performance of Na + -Ti 3 C 2 T x -MS has been confirmed. The superior performance of Na + -Ti 3 C 2 T x -MS can be attributed to the subsize particle and larger interlayer space. Both two factors can effectively increase ions adsorption sites, shorten diffusion path lengths, and reduce diffusion barriers in the CDI process.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Chun Ding,Xuan Zhang,Shu Xiong,Liang Shen,Ming Yi,Boyang Liu,Yan Wang
In this study, an organophosphonate scale inhibitor, ethylenediamine tetra(methylenephosphonic acid) sodium salt (EDTMPA-Na) draw solution, was adopted for alleviating the membrane fouling in the forward osmosis (FO) application of produced water treatment. Compared with the typical NaCl draw solution, the employment of EDTMPA-Na draw solution can alleviate the membrane fouling effectively and therefore achieve a higher water recovery rate (60.6%) after a continuous 48-h test. And the mechanism of membrane fouling control with EDTMPA-Na draw solution has been systemically explored by varying the feed or draw solution compositions. The results turn out that the leakage of EDTMPA-Na draw solute to the feed solution can alleviate the formation of gypsum scales on the membrane surface effectively, ascribed to its excellent scale inhibition ability and the unique diffusion route of the draw solute (resulting in a relative higher concentration of EDTMPA-Na near the membrane surface) in FO process. And the alleviation of membrane scaling can further mitigate the accumulation of organic foulant on the FO membrane . This study may provide an efficient strategy for alleviating the membrane fouling in the FO application of produced water treatment.
研究领域:
环境科学
·
化学工程
✓ 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）