Journal of Energy Storage
·
2023
·
IF 9.4
Xin Xu,Shang Wu,Yang Liu,Chaoyang Liu,Xin Sun,Shuo Tian,Lan Wu,Yuzhi Sun,Zhichao Wang,Quanlu Yang
The tubular microsphere structure is an effective structure for asymmetric supercapacitors due to its high specific surface area and porosity. It can slow down the volume shrinkage caused by redox process. In this paper, tubular-like NiMoO 4 ·xH 2 O microspheres were designed to reach a high specific capacity. The NiMoO 4 ·xH 2 O was prepared by hydrothermal method and subsequent annealing treatment showed a tubular microsphere structure with many particles uniformly distributed. And its specific capacity is 943 F g −1 at 1 A·g −1 and capacity retention is 73.4 % after 3000 cycles. The Bi 2 S 3 /C was selected as negative material to build an asymmetric supercapacitor (battery-type device). It exhibited an impressive specific capacity (419 F g −1 at 1 A g −1 ). It was worth noting that the battery-type devices built with NiMoO 4 ·xH 2 O and Bi 2 S 3 /C can achieve a specific energy of 27.1 Wh kg −1 at 2456.9 W kg −1 and capacity retention of 69.2 % after 5000 cycles. It was shown that NiMoO 4 -xH 2 O and Bi 2 S 3 /C as electrode materials have great potential and can enhance the energy storage application of supercapacitors.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zhao Du,Huayi Cai,Zhiyuan Zhao,Zhonglu Guo,Jing Lin,Yang Huang,Chengchun Tang,Guifeng Chen,Yi Fang
Herein, the graphene quantum dots (GQDs) as a photosensitizer have been introduced on the surface of C-doping porous BN nanoribbons (C-BNNR) to form a series of 0D/1D GQDs/C-BNNR heterojunctions as metal-free catalysts with excellent photocatalytic activity. the C-BNNR with sensitization of GQDs is innovatively applied to the field of CO 2 photocatalytic reduction. The results reveal that GQDs/C-BNNR heterojunctions exhibit excellent optical properties and photocatalytic activity. The CO production rate of GQDs/C-BNNR-3 (33.47 μmol g -1 h -1 ) is 14.49, 4.60 and 2.95 times higher than GQDs (2.31 μmol g -1 h -1 ), BNNR (7.27 μmol g -1 h -1 ) and C-BNNR (11.34 μmol g -1 h -1 ), respectively. This work demonstrates that the addition of GQDs can significantly improve the light utilization of C-BNNR without any effect on the structure. In addition, the strong interaction between the GQDs and C-BNNR leads to the formation of a built-in electric field. It allows photogenerated electrons in GQDs to be transferred into C-BNNR and complexed with holes. As a result, the photogenerated electrons in C-BNNR are induced to participate in the CO 2 photocatalytic reduction process. Meanwhile, GQDs/C-BNNR possess certain CO 2 photocatalytic reduction ability in the NIR region due to the upconversion ability of GQDs. This work pioneer the application of GQDs/C-BNNR heterojunctions in CO 2 photocatalytic reduction and further provides new ideas for the design of novel metal-free catalysts.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ke Zhang,Yajing Wei,Hongyang Cao,Yue Xin,Chuanyi Wang
Tuning reactive oxygen species in peroxymonosulfate (PMS) activation by the structure of catalysts has been extensively studied. But in photocatalysis , the photothermal effect is lack of attention on the alteration of reactive species produced by PMS activation. In this work, ZnFe 2 O 4 /C photocatalyst with oxygen vacancy (ZFO v /C) was synthesized via the calcination of bimetallic Zn/Fe-metal–organic framework. The photocatalytic performance of the catalyst had been studied under several conditions, and the experimental results demonstrated that the photocatalytic reaction rate constant of ZFO v /C photocatalyst without temperature control was 21.3 % higher than that under temperature control. Reactive species quenching experiments and electron paramagnetic resonance indicated that 1 O 2 and h + are the primary reactive species without temperature control, while only 1 O 2 are the dominant reactive species under temperature control conditions. The possible activation site was speculated by in-situ Raman spectroscopy , XPS spectra and cycling experiment. This paper analyzes the reasons for photocatalysis to improve the degradation rate of pollutant from the perspective of the change of reactive species generated by photothermal effect on PMS activation, which may open up opportunities to explore the maximum utilization of sunlight in PMS activation.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Huiqian Yang,Min Wang,Tingting Yang,Chunxia Li,Aifeng Li,Jinsheng Zhao
This paper mainly uses the molecular recognition principle and synergistic effect to synthesize the functional supramolecular 2,7-bis(4-([2,2':6',2''-terpyridin]-4'-yl)phenyl)-9-(heptadecan-9-yl)-9 H -carbazole. The nitrogen active sites at both ends of terpyridine are coordinated with metal copper ions to form a metal supramolecular catalyst that contains both the metal and nitrogen active sites. The surface physical structure and elemental analysis of the synthesized complexes were analyzed using SEM and XPS. The redox properties of the catalysts were characterized using chemical characterization methods, such as cyclic voltammetry (CV), linear sweep voltammetry (LSV), and a rotating ring disk electrode (RRDE). The physical and chemical analysis showed that the catalyst was successfully synthesized and that it was subjected to a redox reaction via a four-electron process. Therefore, the prepared metal supramolecular catalyst has good catalytic performance.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 36
·17072-17079
·
IF 3.3
Hongmei Xie,Guozhi Zhu,Dawei Ye,Weiquan Cai,Junjie Zhang,Kangping Huang,Yuliang Mai,Bing Liao,Jiazhi Chen
Catechyl lignin (C-lignin) is a unique and attractive natural biopolymer used as raw material for the production of chemicals and materials due to its homogeneous linear aromatic structure. Tung nutshells, an important component of industrial solid waste, are rich in C/G-type Lignin. Herein, for the first time, we report that the catalytic oxidation strategy is effective for the conversion of Tung nutshell lignin to value-added C/G-type aromatic monomers using the commercially available CuCl2 catalyst. The reaction conditions, including solvent, temperature, and catalyst dosage, were comprehensively investigated. The optimal yield of 60.8 mg g−1 (or 12.9 wt% Klason lignin) C/G-type aromatic aldehydes and acids was obtained using the CuCl2 catalyst in the CH3CN/H2O (8/2, v/v) solvent mixture at 190 °C for 4 h. The C-type aromatic monomers were formed with an yield of 7.7 mg g−1 (or 1.6 wt%) in the initial 0.2 h and gradually decreased as the reaction progressed. The less amount of C-type lignin-derived aromatic monomers can be attributed to their lower thermal stability under oxidative conditions. The structural evolution study of lignin by GPC and HSQC NMR reveals that the C/G units are effectively depolymerized and transformed into aromatic aldehydes and acids by the CuCl2/CH3CN/H2O catalytic oxidative system.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Dongju Fu,Ziyue Zhu,Shaojun Gao,Hui Qi,Xuguang Liu,Weifeng Liu,Shaozhong Zeng
In this paper, hollow Co/N-C@NiCo2O4 spheres assembled by nanoparticles were developed as efficient bifunctional catalysts for zinc–air batteries. The hollow structure is synthesized with ZIF-67 as a reactant template. NiCo-LDH grown on the ZIF-67 surface maintains its structural integrity during heat treatment and reduces the agglomeration of the material, which promotes charge transport during the catalytic process. The hollow structure has a specific surface area of 124.3 m2 g–1 with rich catalytic active sites. As expected, the power density of the Co/N-C@NiCo2O4-based Zn–air battery is 176 mW cm–2 and the specific capacity is 745 mAh g–1, with 1.45 V open-circuit voltage and 100 h cycling life, much better than those of the 20% Pt/C-RuO2-based Zn–air battery (1.42 V, 133 mW cm–2, 721 mAh g–1).
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Weizhen Cui,Jing Ma,Kezhong Wu,Jing Chen,mingxing Wu
Tungsten trioxide (WO 3 ) loaded on activated charcoal powder (ACP) was sprayed onto ITO conductive glass for using in dye-sensitized solar cells(DSSC). The results showed that the composite electrode of WO 3 @ACP had apparently catalytic activity as a counter electrode for the regeneration of the traditional iodide / triiodide (I - /I 3- ) redox pair. In the dye-sensitized solar cell, the power conversion efficiency on WO 3 @ACP was 5.04%, which was 3.15 times higher than 1.61% on the WO 3 . The followed were the electrical properties test of cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS) and Tafel polarization curve. It was further explained that the catalytic activity of WO 3 @ ACP was obviously affected by the dispersion of WO 3 particles on activated carbon powder.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Linna Huang,Chunyong Zhang,Haitao Liu,Lei Su,Jianning Li,Hengfei Qin
A needle-like CoO/C composite material was designed to enhance the capacitance performance of CoO via one-step hydrothermal strategy. The obtained CoO/C is applied as electrode material and shows a high specific capacitance, reaching 752 F/g which is outstanding characteristic compared with this of recently reported supercapacitor. The CoO supported on C could provide highly enhanced electrochemical performance and show promising energy storage application. CoO/C can be regarded as promising material for practical supercapacitor and this work also provides a valuable reference for the preparation and application of high performance electrode materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Lifen Su,Xiaoyu Liu,Wei Xia,Bin Wu,Changjiang Li,Bo Xu,Bin Yang,Ru Xia,Jianhua Zhou,Jiasheng Qian,Lei Miao
Solar-driven water evaporation is a promising technology of freshwater production to address the water scarcity. However, the photothermal material and the distilled water would be contaminated in the evaporation of wastewater including organic pollutants . In this work, MOF-derived C/TiO 2 composites (carbonized UiO-66-NH 2 (Ti)) with simultaneous photothermal and photocatalytic functions are designed for producing freshwater from sewage. With advantageous features of porous structure with large specific area, excellent sunlight absorption and super-hydrophilicity, the carbonized UiO-66-NH 2 (Ti) layer exhibits high water evaporation efficiency of 94% under 1.0 sun irradiation. Meanwhile, the layer can simultaneously decompose the organic pollutants with degradation efficiency of 92.7% in the underlying water during solar-driven water evaporation. This bifunctional material will provide a new approach for solar-driven water evaporation and photocatalytic degradation of organic pollutant synergistically.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Du Xinze,Fan Hongjun,Liu Shenglin,Zhang Z. Conrad
C−C bond forming reaction by alkylation of aryl rings is a main pillar of chemistry in the production of broad portfolios of chemical products. The dominant mechanism proceeds via electrophilic substitution of secondary and tertiary carbocations over acid catalysts, forming multiple aryl alkylation products non-selectively through all secondary and tertiary carbons in the alkyl chains but producing little α-C alkylation products because primary carbocations are poorly stable. Herein, we report that anatase TiO 2 (TiO 2 -A) catalyzes nucleophilic α-C alkylation of phenols with alcohols in high selectivity to simply linear alkylphenols. Experimental and computational studies reveal the formation of Ti=C− bond with the α-carbon of the alkyl group at oxygen vacancies of the TiO 2 -A surface. The subsequent α-C alkylation by selective substitution of phenol ortho- C−H bond is verified by deuterium exchanged substrate and DFT calculations.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 46
·2305436
·
IF 19
Chenjie Han,Yeqing Lyu,Shaona Wang,Biao Liu,Yi Zhang,Jan J. Weigand,Hao Du,Jun Lu
Using ethanol electrocatalytic oxidation reaction (EOR) with a lower reaction potential to replace oxygen evolution reaction (OER) and integrating hydrogen evolution reaction (HER) have a promising development prospect for more energy-saving electrolytic hydrogen production. However, the main challenges of EOR are insufficient catalytic activity, high overpotential, and slow kinetics. Active sites on the electrocatalysts surface are occupied by alkali metal ion hydrate clusters by noncovalent interactions, which is considered to be one of the major causes of these challenges. To reduce the effect of the noncovalent interactions on the catalytic activity of the electrocatalyst, copper is chosen and doped in the form of a single atom in the electrocatalyst (Pt@Cu/C) to increase the electrocatalyst conductivity and make the anode contain more positive charge in this study. Then, alkali metal ion hydrate clusters are difficult to adsorb at the active site of Pt@Cu/C. The EOR electrocatalytic activity of Pt@Cu/C is up to 8184 mA mg Pt −1 , which is ≈4.8 times as high as that of Pt/C. The two-electrode hydrogen production device using Pt@Cu/C as anode for coupled EOR&HER requires a smaller voltage of 0.60 V to reach 10 mA cm −2 compared with that of Pt/C (0.76 V).
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yin Wang,Qikui Man,Shiqi Zhu,Zhenkuang Lei,Guoguo Tan,Hongtao Guan
It’s a hurry to introduce a lightweight and high-efficiency microwave absorption material that is easy to synthesize, since the electromagnetic interference pollution is getting increasingly serious. Carbon-based microwave absorption material based on bimetallic metal-organic frameworks (MOFs) gets high conductivity and good magnetism at the same time, and thus can be regarded as an efficient microwave absorber with lightweight. Herein, we introduce an easy method to compose bimetallic carbon-based microwave absorbers based on ZIF-67. By changing the proportion of Fe 3+ and Co 2+ , not only the magnetism of the material can be adjusted, the amount of carbon nanotubes (CNTs) and so as the dielectric property of the material can also be regulated. The method of introducing precursors at room temperature and then calcinating at an Ar atmosphere is simple to repeat and appropriate for mass production. When the dosage molar ratio of Co 2+ : Fe 3+ is 3: 2, the minimum reflection loss ( RL min ) can reach − 24.83 dB while the effective absorption bandwidth (EAB) can reach 5.14 GHz when the thickness is 1.7 mm, under a 30 wt% filling loading. We believe that this work can provide a reliable method to introduce carbon-based microwave absorption material based on bimetallic MOF materials.
✓ 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）