Journal of Energy Storage
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2023
·
IF 9.4
Haidong Xie,Chunping Hou,Zeyu Yue,Lidong Zhai,Hehang Sun,Hui Lu,Jiandong Wu,Shaolin Yang,Yong Ma
SiO x has high specific capacity for lithium-ion batteries, but the rate and the cycling performances need to be further improved to satisfy the needs of the future. In this study, the C, N, P doping SiO x /G@CNP anodes are prepared by a facile ball milling and heat treatment process . The electrochemical performances of SiO x are improved by the synergistic effect of C, N, P doping. The SiO x /G@CNP-2 anode with the addition of 20 wt% phytate shows the best electrochemical performances and maintains a specific capacity of 77.45% after 150 cycles at 0.2 A·g −1 . Importantly, it exhibits a remarkable rate performance with specific capacities of 528.2 mAh·g −1 and 370.0 mAh·g −1 even at 3.0 and 5.0 A·g −1 , respectively. Artificial graphite and the carbon shell formed by the thermal decomposition of citric acid contribute to the structural stability of SiO x and improve the cycling performance of the material. Moreover, the addition of P element and high content of pyridine N accelerates the rate of Li + deintercalation, and the conductivity and ion diffusion coefficient of the material are effectively promoted, thus greatly improving the rate performance of the material. This work presented herein provides a simple and feasible method for the preparation of high-performance anode materials.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Wenqi Zou,Heyu Li,Minghua Liu,Yuancai Lv
In this study, Cu was loaded on the surface of Ni-MOF by impregnation, and significantly improved the catalytic activity on lignin and its derivatives. The characterization showed that the non-noble bimetallic catalyst owned good dispersion, rich acid sites and stable structure was successfully synthesized. The introduced Cu reduced the reduction temperature of Ni, increased the acidity of the catalyst, and thus improved the catalytic performance and product selectivity of the catalyst. Under the mild conditions (120 °C), the conversion percentage of BPE was as high as 89.6 % using isopropyl alcohol as the hydrogen source. When the reaction temperature was 260 °C, the depolymerization percentage of corn cob lignin was 81.12 %, and the yield of phenol monomer could reach 11.46 wt. %. This work may provide an effective strategy for the preparation of efficient bimetallic catalysts for lignin hydrogenolysis .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yizhe Wang,Jian Xu,Peng He,Wenjun Ma,Xiaoyun Liu,Jun Qian,Peiyuan Zuo,Jinjin Zeng,Qixin Zhuang
Rational design and fabrication of yolk–shell structure is evolving as an effective approach to improve electromagnetic wave absorption performance by enhancing the impedance matching, multiple reflections and scatterings, as well as promoting interfacial polarizations. However, due to the complexity of synthesis, it is still challenging to develop an absorber with yolk–shell structures intergrating two types of losses (dielectric and magnetic loss) simultaneously in the yolk and shell. Herein, novel yolk–shell Co/C nanocubes were successfully constructed via a controlled-etching with tannic acid followed by direct pyrolysis, in which the magnetic component Co and dielectric component C were uniformly distributed in the yolk as well as the shell. It was found that the pyrolysis temperature can adjust the graphitization degree of carbon and the crystallinity of metal Co, which effectively regulated the electromagnetic properties of the YS-Co/C nanocubes. The reflection loss was − 57.34 dB by increasing the pyrolysis temperature to 700 ℃ under a frequency of 11.76 GHz. The corresponding effective absorption bandwidth was 5.6 GHz (9.52–15.12 GHz) at a thickness of only 2.5 mm. The findings obtained from this study lay a solid foundation for novel design of yolk–shell absorbers applied in EMW absorption.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Wenjun Zhu,Xiaohua Zuo,Xiaofei Zhang,Xiangyi Deng,Deng Ding,Chunlei Wang,JunTao Yan,Xiaobo Wang,Guanghui Wang
A novel CuO–Fe 3 O 4 encapsulated in the carbon framework with abundant oxygen vacancies (CuO–Fe 3 O 4 @C) was successfully prepared by thermal conversion of Cu(OAc) 2 /Fe-metal organic framework. The as-prepared catalyst exhibited excellent peroxymonosulfate (PMS) activation performance, good recyclability and fast magnetic separation. Under optimal conditions, the added BPA (60 mg/L) could be completely removed by CuO–Fe 3 O 4 @C/PMS system within 15 min with the degradation rate constant ( k ) of 0.32 min −1 , being 10.3 and 246.2 times that in CuO/PMS (0.031min −1 ) and Fe 3 O 4 /PMS (0.0013 min −1 ) system. A deep mineralization rate of BPA (＞80%) was achieved within 60 min. The results demonstrated the synergistic effect of bimetallic clusters, oxygen vacancies and carbon framework was a key benefit for the exposure of more active sites, the electron donor capacity and the mass transfer of substrates, thereby promoting the decomposition of BPA. Capture experiments and EPR indicated that 1 O 2 was the predominant reactive oxygen species (ROSs). The degradation routes of BPA and the activation mechanism of PMS were proposed. This study offers an opportunity to develop promising MOFs-derived hybrid catalysts with tailored structures and properties for the practical application of SR-AOPs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Bin Hu,Yongqing Yang,Wei Cao,Xixi Wang,Chuan Zhou,Yiyang Mao,Lei Ge,Ran Ran,Wei Zhou
The high cost and unfavorable catalytic performance for oxygen reduction reaction (ORR) is one of the crucial obstacles that impede widely commercialization of proton-exchange membrane fuel cells (PEMFCs). Herein, we provide a novel, mass-producible ORR catalyst made of low-loading (10 wt%) Pt nanoparticles bound to patchy nitrogen-doped carbon (PNC) with uniformly dispersed FeN 4 sites (Pt/FeN 4 -PNC). The derived catalyst exhibits significantly improved catalytic activity and stability, obtaining a promising mass activity (MA) of 0.94 A mg pt −1 at 0.9 V (vs. RHE) with a negligible decay after 30,000 cycles accelerated durability test (ADT). In the fuel-cell assessment (under H 2 -Air conditions at 80 ℃), the Pt/FeN 4 -PNC and Pt/FeN 4 -PNC-10 g (scaled-up production) achieved peak power densities of 1.13 W cm −2 and 1.14 W cm −2 , respectively, and retained 88.5 % and 88.1 % of the initial values after 30,000 voltage cycles (0.60–0.95 V). The patchy structure of PNC substrate guarantees fast electron routes and resistance to corrosion. With the FeN 4 active sites in the PNC substrate, the oxygen molecules are concurrently reduced on the surfaces of the carbon substrate and Pt nanoparticles, thereby causing the ORR reaction zone on the catalyst layer to expand.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Mingrui Guo,Meng Chen,Jixiang Xu,Chao Wang,Lei Wang
Introducing defects and heteroatoms on carbon nitride (g-C 3 N 4 , CN) framework are effective ways to enhance its photocatalytic activity by regulating light absorption and charge carriers separation. Herein, a mechanochemical method was employed to synthesize Br-doped C, N-deficient CN (CN V -mCN-Br) via ball-milling of N-containing precursor and 6-Bromopyridine-3-carbaldehyde (BrPyCHO) followed by calcining. The ball-milling-evolved mechanical forces and BrPyCHO-derived HBr induced formation of C, N vacancies and C-Br bond in CN V -mCN-Br framework. The CN V -mCN-Br exhibited curled nanosheets morphology and separated electrons-holes distribution. The photocatalytic H 2 evolution rates of 1 %Pt-loaded CN V -mCN-Br in distilled water and simulated seawater were 22.21 and 34.41 mmol g –1 h −1 , respectively with 10% triethanolamine . The corresponding apparent quantum yields were 25.87% and 40.08% at 420 nm. This work provides a facile technique to simultaneously introduce defect and heteroatom in CN for high-efficiency photocatalytic H 2 evolution.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Zhuojun Duan,Mingyu Pi,Dingke Zhang,Peng Zhang,Junkai Deng,Shijian Chen
To promote hydrogen production through water splitting, novel porous 3D Al doped CoP 3 nanowire arrays on carbon fiber paper are successfully fabricated as an effective self-supported electrode for hydrogen evolution reaction . The results indicate that the electrocatalytic performance of CoP 3 can be dramatically enhanced via Al doping. It only needs an overpotential of only 40 mV to achieve the current density of 10 mA cm −2 with a small Tafel slop of 43 mV dec −1 for the Al (10%)-CoP 3 nanowire arrays. Moreover, the Al (10%)-CoP 3 NAs/CFP exhibit superior HER efficiency to Pt/C film at high overpotentials due to prompt release of hydrogen bubbles on the special nanowire arrays surfaces. This study demonstrates an avenue for further improving the electrocatalytic activity via tuning the electronic structures and adjusting the surface morphologies through heteroatoms doping.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Dongxue Luo,Ping Lei,Yunxuan Huang,Guorong Tian,Xingde Xiang
Rechargeable aqueous sodium-ion batteries (SIBs) are urgently pursued as a low-cost candidate for grid-scale storage of intermittent renewable energies. NASICON-type NaTi 2 (PO 4 ) 3 holds great promises as anode material for aqueous SIBs owing to the high theoretical capacity and low redox potential , but being severely challenged by poor cycling performance and low reaction kinetics. Herein, graphene-integrated NaTi 2 (PO 4 ) 3 /C composite is prepared with a facile sol-gel approach as anode material for aqueous SIBs. Electrochemical properties of the material in high-concentration aqueous electrolyte (6 M NaClO 4 ) are systematically investigated by using cycling voltammetry , galvanostatic technique and electrochemical impedance spectroscopy . It is found that it shows an improved charge/discharge performance with a high practical capacity of 104.6 mAh g −1 at 100 mA g −1 , excellent high-rate capability with a reversible capacity of 88.0 mAh g −1 at 2000 mA g −1 , and good cycling stability with 92% capacity retention after 100 cycles. The improved electrochemical performance is attributed to the synergetic contribution of carbon-blending nanostructure and high-concentration electrolyte, which largely enhances structural stability and reaction kinetics of the material. In addition, the redox mechanism is discussed based on experimental results from cyclic voltammetry and X-ray diffraction technique.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 49
·11486-11493
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IF 5.16
Xinyi Wang,Xijun Xu,Jun Liu,Zhengbo Liu,Jiadong Shen,Fangkun Li,Renzong Hu,Lichun Yang,Liuzhang Ouyang,Min Zhu
Graphical Nanocomposite anodes : Uniform peapod-like Cu 3 Ge/Ge@C composites are fabricated successfully through a facile dopamine-coating and annealing route (see figure). Owing to the homogeneous carbon encapsulation and the addition of the inactive alloying phase Cu 3 Ge, this Ge-based anode exhibits an excellent high specific capacity, outstanding cycle stability, and excellent rate performance for LIBs. As anode materials for high-performance Li-ion batteries, peapod-like Ge-based composites, including Ge, a Li-inactive conducting Cu 3 Ge, and a porous carbon matrix are synthesized simply by annealing CuGeO 3 @dopamine in a H 2 /Ar atmosphere. The introduction of the carbon layer and inactive alloying phase Cu 3 Ge not only enhances the electrical conductivity of the Ge anode, but also reduces the volume change of Ge during the cell cycle as a buffer. In particular, the anode of this peapod-like Cu 3 Ge/Ge@C shows an excellent long cycle life as well as outstanding capacity performance, with a discharge specific capacity up to 934 mA h g −1 after 500 cycles.
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BIORESOURCE TECHNOLOGY
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2018
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IF 5.807
Yun Huang,Chaoyang Wei,Qiang Liao,Ao Xia,Xun Zhu,Xianqing Zhu
To improve the carbon to nitrogen (C/N) ratio of harvested microalgae biomass for better producing biogas by fermentation, biodegradable cationic starch with high C/N ratio were synthesized to harvest Chlorella vulgaris . The impact of pH was also studied as the zeta potential of both microalgae and cationic starch would change with pH. Results indicated the cationic starch can harvest above 99% of the microalgae and the C/N ratio can rise from 7.50 to 7.90. The zeta potential of microalgae always kept negative and presented a trend of descending firstly and then upgrade. The maximum microalgae biomass flocculation capacity of 1 g cationic starch was 8.62 g with the help of self-flocculation at pH 3. The concentration of flocs formed at pH 11 was 25.74 g L −1 and the diameter was 0.553 mm which was much larger than the flocs formed at pH 3 (0.208 mm).
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ChemCatChem
·
2019
·Vol. 12
·期 2
·584-592
·
IF 4.495
Li-Ping Yang,Jian-Li Mi,Hui-Jie Wang,Jia-Hao Liang,Xue-Jing Yang,Yong-Hai Feng,Peng Zhang,Lu Liu
Graphical ORR and oxidation of alcohol : Bimetallic Cu−Zn co-doped porous N/C catalysts with the presence of different Cu forms show promising activity toward oxygen reduction reaction and oxidation of 1,2-propanediol. The development of non-precious metal catalysts toward oxygen reduction reaction (ORR) is essential for widespread application of fuel cells. Herein, bimetallic Cu−Zn co-doped porous N/C catalysts (Cu−Zn−N/C) with high N content were synthesized via a simple metal-organic framework (MOF)-derived method. The as-prepared Cu−Zn−N/C catalyst presents superior catalytic activity toward ORR with an onset potential of 0.90 V, a half-wave potential of 0.79 V, and a diffusion limiting current density of 5.82 mA cm −2 . It is found that Cu exists in three forms: one exists in Cu particles, and the others exist in Cu single atoms (either in high valence or in zero valence) that embedded in the carbon substrate. The evaporation of Zn atoms during the pyrolysis induces the pore structure of the carbon matrix, making it possible to support for the zero valent Cu atoms. In addition, as an efficient Cu-based catalyst for many applications, we show that the as-prepared catalyst can selectively oxidize 1,2-propanediol to lactic acid with 75.7 % selectivity at 82.8 % conversion.
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Coatings
·
2019
·Vol. 9
·期 8
·489
·
IF 2.33
Qianqian Zhou,Peiyun Li,Shiyuan Fang,Wenru Liu,Jun Mei,Jing Xie
This research was to evaluate the effects of gelatin (G) active coating containing eugenol/β-cyclodextrin (βCD) emulsions combined with superchilling (−0.9 °C) on physicochemical, microbiological, and organoleptic properties of Chinese seabass samples during 30 days of storage. Results showed that seabass samples dipped in G-βCD coatings containing 0.15% or 0.3% eugenol combined with superchilling could significantly lower the total volatile basic nitrogen, K value, total viable count, H2S-producing bacteria,Pseudomonasspp. and Psychrophilic counts, and free fatty acids. Further, G-βCD coatings containing eugenol with superchilling (−0.9 °C) were more effective in retarding the water migration by low field NMR and MRI results, maintaining quality of seabass during storage according to organoleptic evaluation results.Keywords:Chinese seabass;superchilling;active coating;eugenol;shelf life
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危险品化学品经营许可证（带存储）