CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jianping Ai,Yaping Shuai,Min Hu,Lihong Cheng,Siling Luo,Wenkui Li,Zhiqin Chen,Liling Hu,Zehua Zhou
A novel class of high-entropy (HE) spinel ferrites (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )Fe 2 O 4 , have been successfully synthesized by the solution combustion synthesis method followed by heat-treatment at 500–1500 °C. The resultant spinel ferrites were systematically investigated by various methods including XRD , SEM, TEM, EDS, Raman spectra, etc. It was demonstrated that the entropy drives a reversible transformation between a single-phase state and multiphase. And the entropy predominates the thermodynamic landscape. The as-fabricated high-entropy (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )Fe 2 O 4 solid solution is single-phase with homogeneous transition-metal element distribution. Moreover, a trade-off between grain growth and crystallization during heat-treatment process; the average grain size of product is only 352.96 nm after being annealed at 1000 °C for 3 h probably due to “sluggish diffusion effect”. The resultant HE spinel ferrites (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )Fe 2 O 4 were first used as a heterogeneous catalyst of peroxodisulfate (PDS). Compared with basic solution condition, the HE spinel ferrite/PDS system exhibited a higher degradation rate for the removal of rhodamine B (RhB) and tetracycline (TC) at initial pH range of 3.0–5.1. Both the hydroxyl radicals and sulfate radicals played an important role on RhB and TC degradation. The high catalytic efficiency and good stability of high-entropy (Mg 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )Fe 2 O 4 catalyst demonstrates that it is suitable for application in wastewater disposal.
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FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Yuxiang Mao,Jun Cheng,Hao Guo,Lei Qian,Yang Shao,Jiacan Tu,Weijuan Yang
In order to enhance acid-base active sites and their utilization efficiency to efficiently convert microalgal lipids into biodiesel , an acid-base catalyst was synthesized through pyrolyzing Zn Co bimetallic zeolitic imidazolate frameworks (ZIFs). Pyrolysis destroyed saturated coordinated metal-N 4 sites in ZIFs and produced more unsaturated metal-N x and metal nanoparticles , which enhanced Lewis acidity. The increased pyridinic N and unsaturated metal-N x promoted Lewis basicity . Meanwhile, Zn doping reduced sizes of catalyst crystals and metal nanoparticles, which improved utilization efficiency of active sites. Hence, compared with pyrolyzed ZIF-67, the acidity of optimal catalyst increased from 0.205 to 1.535 mmol/g, whereas basicity increased from 0.069 to 0.405 mmol/g. DFT calculations revealed that catalytic performances of metal nanoparticles and unsaturated metal-N x were better than that of saturated metal-N 4 . Therefore, the catalytic efficiency of C-Zn/Co-ZIF = 4 (molar ratio of Zn to Co was 4) catalyst was highest at 96.2%, because of the minimal catalyst crystals and metal nanoparticles.
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高影响因子
Energy Storage Materials
·
2023
·
IF 20.4
Chengyao Zhao,Yiming Lin,Qiaoyan Lin,Qi Liu,Yujing Liu,Zhongqiu Liu,Anguo Ying
Aqueous zinc-ion hybrid capacitors (ZIHCs) are a promising new type of energy storage device, but there is a plight that the unsatisfactory Zn 2+ storage capability of carbonaceous cathodes limits further application. To address this issue, desolvation strategy is employed to tailor the solvation sheath of Zn 2+ in the ultra-micropores (0.59 nm) nanospheres , where H 3 PO 4 acts as phosphorus source for forming C-P bonds and enhancing C=O bonds to further reduce the desolvation energy barrier. In practical application, a quasi-solid-state flexible ZIHC is constructed, which provides a battery-level energy density (293.4 Wh kg −1 ) at a power density (180 W kg − 1 ) and a remarkable capacity retention of 93.4 % after 10 000 cycles. Electrochemical analyses, DFT calculations and structural characterization reveal that ultra-microporous is proved to be a prerequisite for C-P/C=O that are expected to further deplete solvent molecules within a Zn 2+ solvation sheath. Also, the coupling effect between the strong adsorption of Zn 2+ by C-P/C=O and the hydrophobic effect of C-P play an important role in facilitating desolvation process. This work creates a precedent for the application of ultra-microporous carbon materials in ZHICs and provides a brand-new approach for breaking the bottleneck of the low energy density and poor lifespan of ZHICs.
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JOURNAL OF POWER SOURCES
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2023
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IF 9.2
Chuanyong Liu,Liang Wang,Zhaopeng Xia,Wan Shou,Yong Liu
Zn-ion hybrid capacitors (ZICs) recently receive an extensive attention owning to their theoretical energy density as well as high safety. Hollow porous carbon fibers (HPCF) are used as a promising cathode for ZICs due to abundant active sites. However, it is hard to deal with the “trade-off” between defect design and graphitic degree in HPCF electrode. In this work, hollow porous carbon fiber (HPCF) cathodes are prepared via a spinning-co-foaming technique, followed by zinc oxide nanoparticles as template and activation process . The aligned channels and hierarchical cavities in HPCF wall provide a high-speed diffusion path for electrolyte penetration via capillary force . Meanwhile, due to higher exposed surface area and metal-catalytic effect of reduce zinc during pyrolysis , self-standing ZHPCF-5 exhibits a good graphitic degree (I D /I G = 0.84). Its high electrical conductivity (158.3 S m −1 ) provides fast electron transport . The optimized ZHPCF-5 cathode displays a capacity of 220 mAh g −1 at 0.2 A g −1 and an energy density of 224 Wh kg −1 at a 14400 W kg −1 of power density. The assembled quasi-solid-state self-standing ZIC exhibits a high capacity (153.5 mAh g −1 at 0.5 A g −1 ). This work finds a way to simultaneously maintain abundant defects and high electric conductivity in self-standing carbon electrode for boosting Zn 2+ storage.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Qiusheng Zhou,Yuan Tian,Mingyuan Wang,Shuangying Lei,Chuanyin Xiong
The earth-abundant, low-cost, and efficient oxygen electrode materials offer a potential opportunity to satisfy the large-scale production and application of metal-air batteries. Herein, a molten salt-assisted strategy is developed to anchor transition metal-based active sites via in-situ confining into porous carbon nanosheet. As a result, a chitosan-based porous nitrogen-doped nanosheet decorated with the well-defined CoN x (CoN x /CPCN) was reported. Both structural characterization and electrocatalytic mechanisms demonstrate a prominent synergetic effect between CoN x and porous nitrogen-doped carbon nanosheets forcefully accelerates the sluggish reaction kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Interestingly, the Zn-air batteries (ZABs) equipped with CoN x /CPCN-900 as an air electrode shows outstanding durability for 750 discharge/charge cycles, a high power density of 189.9 mW cm −2 , and a high gravimetric energy density of 1018.7 mWh g −1 at 10 mA cm −2 . Furthermore, the assembled all-solid cell displays exceptional flexibility and power density (122.2 mW cm −2 ).
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PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 8
·2268-2275
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IF 7
Xiao-Bao Li,Chun-Li Hu,Fang Kong,Jiang-Gao Mao
Four new phosphates, namely, PbZn(PO4)F (1), PbSn(PO4)Cl (2), PbSn(PO4)Br (3) and PbSn(PO4)I (4), were successfully synthesized by hydrothermal and solid-state reaction methods. PbZn(PO4)F (1) was crystallized in a polar space group Pna21 and showed a significant SHG intensity of about 1.6 × KDP. PbSn(PO4)Cl (2) and PbSn(PO4)Br (3) were isostructural compounds, and they were crystallized in a monoclinic space group P21/n while PbSn(PO4)I (4) was crystallized in a triclinic space group P. PbZn(PO4)F (1) features a new 3D framework while compounds 2–4 show a layered structure. Interestingly, the thermal stability and band gap of PbM(PO4)X are decreased with an increase of the atomic number of the halogen atom, while the rule for birefringence is the opposite. Our work revealed the evolution effects of the halogen atoms on the structure and optical properties of PbM(PO4)X compounds.
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ChemElectroChem
·
2023
·Vol. 10
·期 4
·e202200972
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IF 4
Yu Zhang,Lihua Wang,Dedong Jia,Lijun Yue,Hongjie Zhang,Jingquan Liu
Graphical Activated Carbon Aerogel for Zinc Hybrid Capacitors : The carbon aerogel was fabricated via freeze-drying, carbonization and KOH activation. Due to the hierarchical porous structures, high specific surface area (2267 m 2 g −1 ), and O/N doped, the carbon aerogel based ZHC exhibits high capacity of 133.1 mAh g −1 (0.1 A g −1 ), high energy density of 106.5 Wh kg −1 , and good cycling performance (86.3 % capacity retention after 10000 cycles at 2 A g −1 ). Zn-ion hybrid capacitors (ZHCs), combined with features of rechargeable batteries and double-layer supercapacitors, are considered as one of the most promising energy storage devices due to their high energy and power density. However, there are still many challenges in developing ideal carbon cathode to match the high capacity of Zn anode. In this work, an activated carbon aerogel (ACA) with hierarchical porous structure is successfully prepared via freeze-drying, carbonization and KOH activation process. Thanks to the high accessible specific surface area, rational pore size distribution and N, O co-doping, the as-assembled ZHC based on the optimal sample exhibits high capacity of 299.5 F g −1 (133.1 mAh g −1 ) at 0.1 A g −1 , excellent rate capability of 57.6 % capacity retention even at 20-fold higher current, together with good cycling stability (86.3 % capacity retention after 10000 cycles at 2 A g −1 ). More gratifyingly, it also displays impressive energy density of 106.5 Wh kg −1 , satisfactory power density of 3108 W kg −1 , and promising potential for practical applications. Based on our results, the ACA could be one of the promising candidates for carbon cathodes for ZHCs.
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JOURNAL OF LUMINESCENCE
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2022
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IF 4.171
Lijin Wang,Zhongyuan Guan,Zhenyang Liu,Ouyang Lin,Wenrong Cui,Zhe Yin,Aiwei Tang
The interplay between ZnS shelling reaction and cation exchange affected the genuine nanostructure of the multinary Cu–In–S-based nanocrystals (NCs), which arose from the dosage and injection speed of Zn precursors as well as the surface of the seed NCs. The effects of Zn precursors on the growth of Cu–In–Zn–S NCs have been previously reported. However, effective control of cation exchange based on the surface of seed NCs is still lacking. Herein, a seed-mediated growth method was developed to eliminate the instability of free ligands and ions on the seed NCs. The clean surface of seed NCs was critical for balancing the internal cation exchange and epitaxial shelling reaction of NCs. Importantly, the photoluminescence quantum yield of the Cu–In–Zn–S NCs has been improved without peak shift through this method. In this dynamic balanced process, the as-obtained Cu–In–Zn–S NCs were confirmed to be gradient alloyed structures rather than core-shell structures. Furthermore, this method can be used to synthesize green- and red-emission Cu-In-Zn-S NCs as well. This seed-mediated strategy through simple redispersion may pave a way toward the controllable synthesis of NCs with gradient alloyed structures.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Zihan Meng,Shichang Cai,Rui Wang,Haolin Tang,Shuqin Song,Panagiotis Tsiakaras
The development of highly active and cost-efficient electrocatalysts toward oxygen reduction reaction (ORR) is essential for widespread application of polymer electrolyte fuel cell (PEFC). In the present work, hierarchically structured porous Co-Zn-N-C electrocatalyst is prepared by using soft templated bimetallic-organic framework precursors. The as-synthesized hierarchically porous catalyst presents outstanding ORR onset-potential (0.88 V vs. RHE), half-wave potential (0.78 V vs. RHE), and diffusion limiting current density (5.73 mA cm −2 ), that is similar to that at commercial Pt/C catalyst in acidic electrolyte. It is found that the hierarchical porous architecture is important for its excellent catalytic activity and further testifies that the hierarchically porous electrocatalyst also exhibits superior single PEFC performance with a power density of 412 mV cm −2 . The present work provides not only a facile and low cost strategy toward the preparation of hierarchically porous materials, but also inspires an approach for enhancing the ORR electrocatalytic activity of MOF-derived materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Fufeng Cai,Peijing Lu,Jessica Juweriah Ibrahim,Yu Fu,Jun Zhang,Yuhan Sun
Methanol steam reforming is regarded as a very promising process to generate H 2 suitable for fuel cells. Typically, the Pd-based catalysts can catalyze efficiently methanol steam reforming for hydrogen production . But their high selectivity to CO, a byproduct of methanol reforming reaction , severely limits their potential application. In this work, a series of Nb-modified Pd−Zr−Zn catalysts with different Nb loadings were prepared to study their catalytic activities with more focus on the role of Nb on Pd−Zr−Zn catalyst for methanol steam reforming. The prepared catalysts were fully analyzed by using various characterization techniques, for example, ICP , BET, SEM, XRD , H 2 -TPR, NH 3 -TPD, HRTEM , CO chemisorption , XPS, and Raman. The experimental results showed that an increase in Nb loading for the Nb-modified Pd−Zr−Zn catalysts led to a decrease of the methanol conversion and H 2 production rate. This was probably due to the decrease in the amount of oxygen vacancies on the catalyst surface . However, introduction of Nb into Pd−Zr−Zn catalyst increased the acid strength on the catalytic surface. The aldehyde species derived from methanol decomposition were readily transformed to HCOOH, thus yielding high selectivity to CO 2 for the Nb-modified Pd−Zr−Zn catalysts. Significantly, the addition of Nb to Pd−Zr−Zn catalyst facilitated the incorporation of Pd into the ZnO lattices, which led to the formation of Pd−Zn alloy. Consequently, the Nb-modified Pd−Zr−Zn catalysts exhibited significantly lower CO selectivity and production rate than the Pd−Zr−Zn catalyst. From the results, this work offers a new way to the rational design of selective methanol steam reforming catalysts to decrease the formation of byproduct CO.
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高影响因子
ACS Photonics
·
2018
·
IF 6.88
Pengqi Lu,Ruifeng Li,Ni Yao,Xusheng Dai,Zhenyu Ye,Kai Zheng,Weiguang Kong,Wei Fang,Shuang Li,Qinghua Xu,Huizhen Wu
Heavy-metal-free I–III–VI2 quantum dots (QDs) have recently emerged as favorable alternatives to toxic II–VI QDs for optoelectronic and biological applications, but low fluorescence efficiency is a key issue related to the promising nanocrystals. In this work, we demonstrate big enhancement of two-photon fluorescence efficiency and low threshold two-photon pumped amplification of spontaneous emission (ASE) of Zn-processed CuInS2 (CIS) QDs for the first time. The change of two-photon process caused by Zn2+ cation exchange in CIS QDs is systematically investigated. Two-photon ASE in Zn-processed CIS QDs films is achieved with a record of low threshold fluence of 5.7 μJ/cm2. With high two-photon fluorescence quantum yields and low threshold ASE, the Zn-processed CIS QDs could become a promising candidate for two-photon bioimaging, nonlinear optical and novel QDs laser devices.
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Journal of Energy Chemistry
·
2018
·
IF 3.886
Hao Fan,Yu Wang,Fujie Gao,Longqi Yang,Meng Liu,Xiao Du,Peng Wang,Lijun Yang,Qiang Wu,Xizhang Wang,Zheng Hu
Exploring inexpensive and efficient bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is critical for rechargeable metal-air batteries . Herein, we report a new 3D hierarchical sulfur and nitrogen co-doped carbon nanocages (hSNCNC) as a promising bifunctional oxygen electrocatalyst by an in-situ MgO template method with pyridine and thiophene as the mixed precursor. The as-prepared hSNCNC exhibits a positive half-wave potential of 0.792 V (vs. reversible hydrogen electrode , RHE) for ORR, and a low operating potential of 1.640 V at a 10 mA cm −2 current density for OER. The reversible oxygen electrode index is 0.847 V, far superior to commercial Pt/C and IrO 2 , which reaches the top level of the reported bifunctional catalysts . Consequently, the hSNCNC as air cathodes in an assembled Zn-air battery features low charge/discharge overpotential and long lifetime. The remarkable properties arises from the introduced multiple heteroatom dopants and stable 3D hierarchical structure with multi-scale pores, which provides the abundant uniform high-active S and N species and efficient charge transfer as well as mass transportation. These results demonstrate the potential strategy in developing suitable carbon-based bi-/multi-functional catalysts to enable the next generation of the rechargeable metal-air batteries.
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高影响因子
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