FUEL
·
2024
·
IF 6.7
Xuzhao Shi,Wei Song,Tao Wei,Kui Zhang,Zhigang Shao
The anode Pt catalyst of a proton-exchange membrane fuel cell (PEMFC) is susceptible to poisoning by trace amounts of CO in hydrogen, which restricts its large-scale commercialisation. Therefore, developing PEMFC catalysts with CO tolerance is crucial as it would reduce the requirement for hydrogen purity. In this study, we present a CO-tolerant catalyst for the PEMFC anode synthesised by loading Pt onto a polyaniline-modified conductive carbon composite support (Pt/C-PANI). The results showed that the catalyst containing 5% PANI in the composite support (Pt/C-PANI-5) exhibited optimal hydrogen oxidation reaction activity and CO tolerance. Electrochemical tests showed that the current drop of Pt/C-PANI-5 was 6.8%, compared to 20% and 12% for Pt/C-sys and commercial PtRu/C catalysts, respectively. Furthermore, results of the single-cell test confirmed improved CO tolerance. These findings provide a potential solution for developing cost-effective fuel cell catalysts with improved CO tolerance.
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yuelong Xu,Na Li,Ran Wang,Liang Xu,Zhiwei Liu,Tifeng Jiao,Zhenfa Liu
Metal phosphides are usually being utilized for hydrogen evolution electrocatalysts with enormous potential. Meanwhile, the heterostructure can enhance the catalytic performance for hydrogen evolution reaction (HER). Inspired by the recent preparation of efficient catalysts for HER by using heterogeneous structures of different metal phosphides, we have designed a simple two-step method strategy based on sol-gel/carbonization to prepare the bimetal phosphide coated by nitrogen and phosphorus codoped (N,P-codoped) porous carbon . Phytic acid, chitosan and aniline are adopted to form the N,P-codoped porous carbon framework, the ferric chloride (FeCl 3 ) and ammonium molybdate tetrahydrate (H 8 MoN 2 O 4 ) are used as the metal sources to obtained bimetal phosphides (MoP/FeP). The heterostructural interface between the bimetal phosphides of MoP/FeP enhance the catalytic performance, while the N,P-codoped porous carbon promotes the development of reaction kinetics to accelerate the mass and electron transition. The prepared catalysts display limited overpotentials at high current density and exhibit good stability for long-time test. Density functional theory (DFT) is adopted to investigate the interact between the bimetal phosphides, which proves that the heterostructural interface can reduce the reaction Gibbs free-energy (△G H* ) and benefit the adsorption / desorption of intermediate H* . This work provides a facile route to the design of the metal phosphides for HER.
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DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 22
·期 11
·2000402
·
IF 3.217
Yanpeng Xue,Shuqiang Wang,Yanyan Xue,Lili Cao,Mengyan Nie,Ying Jin
Until now, superhydrophobic materials that are scale-up fabrication and application to harsh environments remain challenging because of their fragile mechanical durability. Because of their unique electronic structure, rare-earth oxides (REOs) have been proven to be intrinsically hydrophobic. Herein, cerium oxide particles (CeO 2 ) are added to the coating by coelectrodeposition. The Co–Ni/CeO 2 composite coating from the electrolyte containing 3.44 g L −1 possesses a flower-like hierarchical structure, displaying a superhydrophobic behavior after the modification by 1H,1H,2H,2H-perfluorooctyltrichlorosilane (PFTEOS). More importantly, excellent mechanical durability with critical abrasion distance of 22.5 m is achieved under a 5 kPa fixed normal pressure in the liner abrasion test before the loss of superhydrophobicity. Also, electrochemical measurements demonstrate that the superhydrophobic composite coatings display high corrosion resistance.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yanyan Duan,Gen Zhao,Xiaotao Liu,Jiale Ma,Shuyao Chen,Yanlin Song,Xiaodong Pi,Xuegong Yu,Deren Yang,Yiqiang Zhang,Feng Guo
High power conversion efficiency (PCE) and good long-term stability are everlasting pursuit for perovskite solar cells. We present here CsPbBr 3 perovskite film deposited by vacuum co-evaporation of CsBr and PbBr 2 . By optimizing evaporation rate ratio of the two precursor and annealing temperature, perovskite films with large grain and high crystallinity are obtained. Furthermore, by regulating spinning speed of TiO 2 precursor solution and thickness of CsPbBr 3 film, a best PCE of 9.43% is recorded under 100 mW cm −2 illumination, providing a significant enhancement in contrast with 6.26% of device based on spin-coating method. Additionally, the PCE of resulting perovskite solar cell without encapsulation remains at 96% of initial value after storing for 480 h under humidity of 40% in air. Our findings in this work deliver an effective strategy to fabricate high-performance inorganic perovskite solar cells.
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DOI
高影响因子
Nuclear Materials and Energy
·
2021
·
IF 2.32
S. Krat,Yu. Gasparyan,Ya. Vasina,A. Prishvitsyn,G.De Temmerman,A. Pisarev
Available literature data for beryllium content in D-Be co-deposited layers was modeled using newly developed model. It was shown that the model adequately describes the experimental results. An empirical scaling for the available trap concentrations as a function of deuteron energy was introduced in order to improve the agreement between the experimental data and model predictions. The limited recombination rate describes the co-deposition better than the unlimited one. Assuming two types of traps in the film with detrapping energies of 0.8–0.9 and 1.2–1.3 eV and trap concentrations of 10 at. % and 1 at. %, respectively, and the deuterium implantation energy of 15.6 eV, the average relative deviation between experimental and predicted D/Be values of 1.9 was observed, which is better than the empirical D/Be scalings.
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Jiami Ma,Weihong Guo,Cheng Ni,Xiaoping Chen,Weihao Li,Juan Zheng,Wei Chen,Zhu Luo,Jinlong Wang,Yanbing Guo
Ground-level ozone (O3) pollution has emerged as a significant concern due to its detrimental effects on human health and the ecosystem. Catalytic removal of O3 has proven to be the most efficient and cost-effective method. However, its practical application faces substantial challenges, particularly in relation to its effectiveness across the entire humidity range. Herein, we proposed a novel strategy termed “dual active sites” by employing graphitized carbon-loaded core–shell cobalt catalysts (Co@Co3O4-C). Co@Co3O4-C was synthesized via the pyrolysis of a Co-organic ligand as the precursor. By utilizing this approach, we achieved a nearly constant 100% working efficiency of the Co@Co3O4-C catalyst for catalyzing O3 decomposition across the entire humidity range. Physicochemical characterization coupled with density functional theory calculations elucidates that the presence of encapsulated metallic Co nanoparticles enhances the reactivity of the cobalt oxide capping layer. Additionally, the interface carbon atom, strongly influenced by adjacent metallic Co nuclei, functions as a secondary active site for the decomposition of O3 decomposition. The utilization of dual active sites effectively mitigates the competitive adsorption of H2O molecules, thus isolating them for adsorption in the cobalt oxide capping layer. This optimized configuration allows for the decomposition of O3 without interference from moisture. Furthermore, O3 decomposition monolithic catalysts were synthesized using a material extrusion-based three-dimensional (3D) printing technology, which demonstrated a low pressure drop and exceptional mechanical strength. This work provides a “dual active site” strategy for the O3 decomposition reaction, realizing O3 catalytic decomposition over the entire humidity range.
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DOI
PubMed
高影响因子
ACS Catalysis
·
2016
·
IF 9.307
Xianwei Wang,Nobutaka Maeda,Alfons Baiker
Promotion of Au/TiO2 by FeOx addition is shown to result in a very strong enhancement of activity and selectivity in the NO reduction with CO. The nanocomposite Au-FeOx/TiO2 catalysts were prepared by deposition–precipitation (Au/TiO2) and subsequent impregnation (FeOx). Structural characterization of the nanocomposite catalysts using XRD, TEM, TPR, XPS, and DRIFTS revealed that they consist of titania-supported Au particles of about 4.4–4.8 nm size, which were partially covered with a thin layer of FeOx,, mainly made up of Fe2+ (FeO), in addition to a small fraction of Fe3+ (Fe2O3). In situ DRIFTS studies showed that, in comparison to Au/TiO2, on the Au-FeOx/TiO2 nanocomposites new adsorption sites were created, which led to enrichment of CO and NO molecules on the Au surface and at its interfaces with FeOx and TiO2. At the reaction temperature (250 °C), a new surface NO–CO complex, where both Fe and Au are proposed to be involved in the adsorptive interaction, was discovered. The titania-supported Au-FeOx nanocomposites considerably facilitated the formation of this complex and contributed to the striking enhancement of the catalytic performance (activity and selectivity) of the Au-based catalyst.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 12
·16577-16588
·
IF 2.478
Zhang Dongke,Huang Ting,Zhao Pengfei,Zhang Ze,Qi Xingtao,Yang Zhenyu,Cai Jianxin
Due to the low conductivity of sulfur and the dissolution of polysulfides, the application of lithium–sulfur (Li–S) batteries have encountered certain resistance. Increasing conductivity and introducing polarity into the sulfur host can effectively overcome these long-standing problems. Herein, we first prepared Co 3 W 3 C@ C@CNTs/S material and used it in the cathode of lithium–sulfur batteries. Carbon nanotubes treated with acidification have good dispersibility in aqueous solution, good adsorption on positively charged metal ions due to abundant oxygen-containing functional groups on the surface. After carbonization treatment, Co 3 W 3 C will be firmly anchored on the surface of carbon nanotubes, which is conducive to improving the electrical conductivity and stability of its own materials. Polar Co 3 W 3 C can form a strong interaction with polysulfide intermediates, effectively inhibiting its shuttle effect, improving the utilization of sulfur cathode electrodes, and keeping the capacity and cycle stability. The Co 3 W 3 C@C@CNTs/S electrode material has a capacity of 1093 mA h g −1 at 0.1 A g −1 and 482 mA h g −1 at 5 A g −1 . Even after 500 cycles of 2 A g −1 , the capacity of each cycle is only reduced by 0.08%. The excellent stability of this material can provide a new idea for the future development of lithium–sulfur batteries.
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DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Chen Hu,Gaoli Guo,Huihua Li,Jian Wang,Zhengqing Liu,Leilei Zheng,Huang Zhang
Aqueous zinc-ion batteries (ZIBs) have garnered significant attention due to their high energy, intrinsic safety, and environmental friendliness. NASICON-type compounds are promising cathode candidates in aqueous batteries due to their high ionic conductivity , and high operating voltage. However, these materials, e.g., Na 3 V 2 (PO 4 ) 3 , suffer from inevitable structural degradation and dissolution in aqueous electrolytes, thus hampering their practical performance in aqueous batteries. Interfacial chemistry modulation by electrolyte engineering is beneficial for stabilizing Zn metal anode and high-voltage cathodes in ZIBs . Herein, the interfacial chemistries in an engineered non-concentrated aqueous electrolyte by co-solvent strategy are reported, which synergistically enables high reversibility of Zn anode and long cycling stability of Na 3 V 2 (PO 4 ) 3 cathode. Consequently, the Zn||Na 3 V 2 (PO 4 ) 3 full-cell exhibits high Coulombic efficiency (∼99.3% in average) with a prolonged cycling life, which can be ascribed to the synergistic-effect of the solid-electrolyte interphases with unique organic/inorganic hybrid structures on the electrodes. This work discloses the structures of the interphases formed on the electrodes induced by co-solvent strategy in aqueous electrolytes and their working mechanisms in stabilizing the aqueous Zn batteries, which will guide the future design of advanced aqueous electrolytes with unique interfacial chemistries for batteries.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Qinbo Jiang,Zijuan Yu,Zong Meng
Edible double network oleogels were prepared by hydroxypropyl methylcellulose (HPMC) and glyceryl monostearate (GMS) by the cryogel-templated method. Hot GMS soybean oil solutions were absorbed by HPMC cryogels, which were further homogenized and cooled to form oleogels containing both the HPMC network and GMS network. The crystal network constructed by GMS crystal clusters significantly enhanced the mechanical and rheological attributes of oleogels. Both the HPMC network and the GMS network were built up due to hydrogen bonds. According to the normalization analysis of FTIR and the deepening of the shift of the absorption peak, hydrogen bonds could also be formed between HPMC and GMS to connect the two independent networks. Double network oleogels were further used to fabricate cookies and cakes, assessed by the texture profile analysis. The combination of the HPMC network and GMS network in preparing oleogels will promote the application of oleogels as the fat replacer .
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DOI
高影响因子
Asian Journal of Organic Chemistry
·
2019
·Vol. 8
·期 3
·422-427
·
IF 2.496
Fan Yang,Yan Cao,Chong Xu,Yan Xia,Zhuo Chen,Xing He,Yun Li,Wang Yang,Yongfeng Li
Graphical Recycle for the environment ! Nitrogen and phosphorus co-doped graphene-like carbon (NPG) strongly enhances the reactivity in the selective catalytic oxidization of aromatic alcohols to carboxylic acids with TBHP and O 2 in water. The NPG catalyst can be fabricated by combining ball-milling with thermal treatment method. The NPG catalyst shows good recyclability, which can be simply and efficiently used for eight consecutive runs. The nitrogen and phosphorus co-doped graphene-like carbon (NPG) is cost-effective fabricated by simple ball-milling and thermal treatment. The as-prepared NPG can be used as a metal-free catalyst for selective catalytic oxidation of aromatic alcohols to their corresponding acids by using TBHP and O 2 as the oxidant in water. It is observed that various aromatic alcohols bearing electron-donating/withdrawing groups can be oxidized to the corresponding acids in excellent yields. No dehalogenation and steric-hindrance effects are detected in this oxidation process. In addition, the NPG catalyst can be easily separated and efficiently reused seven times, showing good recyclability.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 36
·e55915
·
IF 2.7
Tianyuan Liu,Weihao Wang,Tian Yin,Zhikui Jiang,Zhichao Zhen,Guochun Yan,Junhui Ji
The application and promotion of biodegradable plastics are hindered by the imbalance between their mechanical and degradation performance imbalance, as well as high costs. Herein, a series of poly(ethylene adipate-co-terephthalate) (PEAT) copolyesters with excellent mechanical and degradation properties are synthesized by one-step melt polycondensation. The influence of the proportion of aliphatic groups in the molecular chain on the structure and properties, especially the degradation performance, of the copolyesters was studied. The molecular chain flexibility and degradability of PEAT increases with increasing of adipic acid content and decreasing of ET fragment length ( L ET ). The comprehensive mechanical properties of PEAT60 can be comparable to traditional packaging material poly(butylene adipateco-terephthalate) (PBAT). The degradation performance of PEAT can be adjusted the molecular chain structure. PEAT with L ET < 3 exhibit degradation performance, and PEAT with L ET < 2.2 exhibit significant degradation acceleration. The excellent mechanical and degradable properties of PEAT copolyester make it expected to be used in degradable packaging and other fields to help solve plastic pollution, while its lower cost will aid in the promotion of degradable materials.
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高影响因子
危险品化学品经营许可证（带存储）