Materials
·
2021
·Vol. 14
·期 24
·7655
·
IF 3.623
Huaijiu Deng,Mattia Biesuz,Monika Vilémová,Milad Kermani,Jakub Veverka,Václav Tyrpekl,Chunfeng Hu,Salvatore Grasso
We report on an ultrarapid (6 s) consolidation of binder-less WC using a novel Ultrahigh temperature Flash Sintering (UFS) approach. The UFS technique bridges the gap between electric resistance sintering (≪1 s) and flash spark plasma sintering (20–60 s). Compared to the well-established spark plasma sintering, the proposed approach results in improved energy efficiency with massive energy and time savings while maintaining a comparable relative density (94.6%) and Vickers hardness of 2124 HV. The novelty of this work relies on (i) multiple steps current discharge profile to suit the rapid change of electrical conductivity experienced by the sintering powder, (ii) upgraded low thermal inertia CFC dies and (iii) ultra-high consolidation temperature approaching 2750 °C. Compared to SPS process, the UFS process is highly energy efficient (≈200 times faster and it consumes ≈95% less energy) and it holds the promise of energy efficient and ultrafast consolidation of several conductive refractory compounds.Keywords:tungsten carbide;ultrarapid consolidation;ultrahigh temperature flash sintering
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CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
You Wu,Yi Yang,Miaoli Gu,Chuanbiao Bie,Haiyan Tan,Bei Cheng,Jingsan Xu
Solar photocatalysis is a promising, green, and sustainable technique for the synthesis of H 2 O 2 . In this study, low-dimensional ZnO/ZnIn 2 S 4 S-scheme heterojunction photocatalysts are fabricated using electrostatic spinning and chemical bath deposition methods for the efficient photocatalytic production of H 2 O 2 . ZnO nanofibers loaded with 20 wt% ZnIn 2 S 4 exhibit a superior H 2 O 2 production rate of 928 μmol g −1 h −1 , which is more than four times higher than that seen in pristine hexagonal phase ZnO and ZnIn 2 S 4 . First-principles calculations and in-situ X-ray photoelectron spectroscopy reveal the charge separation and transfer mechanisms in the S-scheme heterojunction. The construction of the S-scheme heterojunction facilitates the spatial separation of charge carriers, and electrons and holes with higher redox abilities are retained. Photoelectrochemical and photoluminescence tests further show that the formation of an S-scheme heterojunction is beneficial for the separation of photoinduced charge carriers. Electrochemical tests and electron paramagnetic resonance measurements indicate that H 2 O 2 production is primarily via a two-step single-electron O 2 reduction path. This study provides a new approach for the construction of S-scheme heterojunction materials that can efficiently produce H 2 O 2 under solar irradiation.
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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 120
·期 42
·e2312091120
·
IF 11.1
Xia Lin,Junwei Zhang,Huihui Yan,Jiaxi Xu,Zhonghao Miao,Guangchang Shu,Shuyuan Zhao,Tianyuan Zhang,Haoxiang Yu,Lei Yan,Liyuan Zhang,Jie Shu
Metal-sulfur batteries have received great attention for electrochemical energy storage due to high theoretical capacity and low cost, but their further development is impeded by low sulfur utilization, poor electrochemical kinetics, and serious shuttle effect of the sulfur cathode. To avoid these problems, herein, a triple-synergistic small-molecule sulfur cathode is designed by employing N, S co-doped hierarchical porous bamboo charcoal as a sulfur host in an aqueous Cu-S battery. Expect the enhanced conductivity and chemisorption induced by N, S synergistic co-doping, the intrinsic synergy of macro-/meso-/microporous triple structure also ensures space-confined small-molecule sulfur as high utilization reactant and effectively alleviates the volume expansion during conversion reaction. Under a further joint synergy between hierarchical structure and heteroatom doping, the resulting sulfur cathode endows the Cu-S battery with outstanding electrochemical performance. Cycled at 5 A g−1, it can deliver a high reversible capacity of 2,509.8 mAh g−1 with a good capacity retention of 97.9% after 800 cycles. In addition, a flexible hybrid pouch cell built by a small-molecule sulfur cathode, Zn anode, and gel electrolytes can firmly deliver high average operating voltage of about 1.3 V with a reversible capacity of over 2,500 mAh g−1 under various destructive conditions, suggesting that the triple-synergistic small-molecule sulfur cathode promises energetic metal-sulfur batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiating Liu,Peizeng Yang,Yuefei Ji,Junhe Lu
Sulfate radical (SO 4 •- )-based advanced oxidation processes (SR-AOPs) show great potential in the elimination of organic pollutants in wastewater treatment and groundwater remediation . Tetrabromobisphenol S (TBBPS) as an emerging contaminant can be effectively degraded in SR-AOPs. However, the present study found that SO 4 •- also reacted with ammonium (NH 4 + ), a ubiquitous inorganic nitrogen species in aquatic environments, thus markedly affected the rates and pathways of TBBPS degradation in SR-AOPs. TBBPS underwent β-scission and debromination upon SO 4 •- attack, leading to various transformation products . The released bromide (Br - ) underwent further oxidation by SO 4 •- to form free bromine which reacted with certain TBBPS intermediates, generating disinfection byproducts (DBPs). When NH 4 + was present in such system, the abatement of TBBPS was apparently suppressed. Meanwhile, NH 4 + was oxidized by SO 4 •- to nitrogen dioxide radical (NO 2 • ) which coupled with certain radical intermediates of TBBPS oxidation, yielding nitrophenolic products including 2,6-dibromo-4-nitrophenol (DBNP) and mono-nitro substituted TBBPS. When 10 μM TBBPS was treated by heat activated peroxydisulfate with 1 mM NH 4 + , the molar yield of DBNP reached 22% in 2 h. More importantly, NH 4 + scavenged the in situ formed free bromine to form monobromamine (NH 2 Br), decreasing regulated DBPs formation but leading to highly toxic dibromoacetonitrile (DBAN). This study broadens the understanding of interactions between the transformation of halogens and NH 4 + during SO 4 •- oxidation. It also reveals the potential environmental risks when SR-AOPs are employed for the organohalogen pollutants degradation in realistic environments where NH 4 + is present.
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FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 5
·1208-1217
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IF 2.153
Zhao Chenyu,Wang Guangshu,Sun Mengtao,Cai Zewei,Yin Zichu,Cai Yurong
As one of the most important parameters to characterize the organic pollution of water, biochemical oxygen demand (BOD) determined through a rapid, in situ and on line method is very attractive. In this paper, a new BOD biosensor has been developed, which are composed of the ecofriendly precursor of Saccharomyces cerevisiae ( S. cerevisiae ) embedded in bacterial cellulose (BC) matrix and the Ketjen Black (KB) modified glassy-carbon electrode. Furthermore, a doublemediator system is constructed using potassium ferricyanide and menadione in reaction cell to transfer electron from the microbe to electrode. The responses of glucose glutamic acid (GGA) standard solutions are amperomertrically measured with an applied potential of 0.25 V versus Hg/Hg 2 Cl 2 in a three-electrode system. Under the optimum conditions, the (BC/ S. cerevisiae -menadione)/KB modified electrode shows a high operational stability with relative standard deviation (RSD) of 4.16% (fourteen assays), a good repeatability (RSD=3.10%), a fast response time (in 20 minutes) and a wide linear range (from 10–220 mg O 2 l −1 ). The BOD values measured by this method have been highly correlated with the standard BOD 5-day method for wastewater samples (R 2 =0.9859, n=3), indicating that it can meet the requirement of BOD rapid measurement.
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Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·716-724
·
IF 5.693
Yan Zhaoqian,Sun Zhihao,Li Anran,Liu Hongshou,Guo Zihao,Qian Lei
Traditional Fe-based oxide with poor intrinsic conductivity, severe volume expansion, and structure destruction exhibits the poor cyclic performance for anode materials of lithium ion batteries (LIBs). Heteroatomic doping Fe-based oxide with nanoarchitectures is deemed to settle the above problems effectively. Herein, with sulfur (S) doping, three-dimensional porous flower-like Fe 2 O 3 (denoted as S- Fe 2 O 3 ) prepared via ordinary solvothermal reaction and calcining process was ingeniously designed as anode materials for LIBs. The S doping changed the morphology, improved the electrical conductivity, and provided more active sites for lithium storage. The flower-like S-Fe 2 O 3 made up of plentiful carbon encapsulated nanoparticles not only relieved the volume expansion but also provided the connected conductive network. The as-prepared flower-like S-Fe 2 O 3 electrode delivered a high discharge/charge capacity (1570.8 mAh g −1 at 0.1 A g −1 after 100 cycles) and the excellent long-cycle performance (521.3 mAh g −1 at 2.0 A g −1 after 1000 cycles). S doping and nanoarchitectures engineering in this work provide rational preparation strategies for composites containing transition metal oxides toward energy storage system. Graphical abstract Three-dimensional porous flower-like S-Fe 2 O 3 from ordinary solvothermal reaction and calcining process is ingeniously designed as anode materials for LIBs.
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Materials Express
·
2020
·Vol. 10
·期 10
·1725-1731
·
IF 1.65
Duan Xiaobo,Ding Yanhong,Yu Meng
Multilayer graphene was prepared in this study by microwave burst method. Cu9S5/CoS/graphene and CuS/CoS2/graphene composites were obtained by hydrothermal method to regulate the molecular structure and combination of Cu and Co metal sulfides on graphene
substrate. Graphite oxide was doped by hydrothermal method, and then Cu9S5/CoS/graphene composite was prepared by microwave explosion method. Raman, SEM and TEM were used to characterize the self-made graphene. Results showed that the multilayer graphene had a bag-like
structure which was beneficial to anchor sulfide. Three graphene-based composites were characterized by scanning electron microscopy, X-ray diffraction, energy spectrum analysis and electrochemical properties. Moreover, results showed that CuS/CoS2/graphene had the best electrochemical
performance, and its specific capacity reached 324 F/g when the current density was 1 A · g–1, which was much higher than that of the other two samples. Capacity retention rate, interfacial charge transfer resistance and electrolyte diffusion resistance also have advantages.
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VACUUM
·
2020
·
IF 2.906
Yujing Yang,Cui Yang,Kai Tao,Qingxiang Ma,Lei Han
Ternary metal oxide , such as ZnCo 2 O 4 has attracted widespread attention as electrode material for supercapacitors owing to its high theoretical activity and rich redox reactions arising from the synergistic effects between two different metal species. However, the compromised electrochemical performance due to low electronic conductivity and deficient active sites of ZnCo 2 O 4 impedes its practical applications. Herein, S-doped ZnCo 2 O 4 microspindles (denoted as S-ZnCo 2 O 4 ) have been obtained by simple hydrothermal synthesis followed by calcining and sulfurization treatments. It is indicated that the doping of S results in the formation of defects and disorders without altering the crystalline structure of ZnCo 2 O 4 , which is beneficial for charge transfer, and exposing more active sites. Taking advantage of the desired structure and composition, the S-ZnCo 2 O 4 displays superior electrochemical properties when acting as an electrode material for supercapacitors. It delivers a high specific capacity of 214.1C g −1 (522 F/g) at the current density of 0.5 A g −1 , which is almost 8.5 times that of the ZnCo 2 O 4 (25 C g −1 , 61 F/g). Moreover, the S-ZnCo 2 O 4 also shows good rate capability (82% at 10 A g −1 ) and excellent electrochemical stability (78% retention after 5000 cycles). This work demonstrates that anion doping can be an efficacious strategy of boosting electrochemical performance.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2020
·Vol. 35
·期 2
·272-279
·
IF 0.64
Li Zhi,Shen Wenjian,Zhao Juan,Ying Hangkai,Wu Zhengli,Liu Yifan,Li Wangnan,Ku Zhiliang,Peng Yong,Huang Fuzhi,Cheng Yibing,Zhong Jie,Fu Zhengyi
A novel aqueous Sn-S complex solution was applied as precursor to fabricate SnO 2 electron selective layers (ESLs) for the hybrid perovskite solar cells (PSCs). The tin and sulfur powder were directly dissolved in a (NH 4 ) 2 S water solution to form Sn-S precursor. After depositon and annealing, the SnO 2 film was formed, presenting as a low cost and enviromental friendly method for preparation of ESL. The films showed excellent transmittance at visible wavelength range. Moreover, the method exhibited high compatibility for doping using Cu, Cd, Li, and Zn elements. Zn doping (0.05 M) in the as-prepared SnO 2 ESL significantly improved perovskite solar cells (PSCs) performance. The highest PCE of 13.17% was achived with 15% enhancement compared to that of undoped SnO 2 ESL samples. TiCl 4 modifications on SnO 2 film improved photovoltaic performance to 14.45%, but resulted in the poor long-term stability, around 80% more degredation than that of PSCs based on Zn-doped SnO 2 films.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xiuzhen Wan,Shuai Liu,Xuanxuan Xin,Pengfei Li,Jie Dou,Xiao Han,Inn-Kyu Kang,Jiang Yuan,Bo Chi,Jian Shen
Wound repair is a dynamic and complex process that involves various interactions between repair cells, growth factors and the extracellular matrix. Nitric oxide (NO) plays a pivotal role in wound healing, including causing the contraction of wound surfaces, dilating blood vessels, participating in inflammation, and promoting collagen synthesis, angiogenesis, and fibroblast proliferation. Here, we prepared a novel keratin-based nitric oxide donor, called S-nitrosated keratin (KSNO). Then, KSNO was coelectrospun with polyurethane (PU) and gelatin (Gel) to produce PU/Gel/KSNO biocomposite mats. The prepared mats released NO without cytotoxicity, promoted the proliferation of L929 murine fibroblasts and human umbilical vein endothelial cells (HUVECs), and inhibited bacterial growth. These mats could also accelerate the cell adhesion and growth along the random arrangement of electrospun fibers, and simulate the structure of the natural extracellular matrix to provide good scaffolds for cell. The effect of PU/Gel/KSNO on promoting wound healing was investigated on a full-thickness excisional cutaneous wound model in rats. The results demonstrated that these mats accelerated wound healing without inflammatory reaction. In conclusion, PU/Gel/KSNO mats display excellent bioactivity and biocompatibility and have potential in the field of wound repair.
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ACS Nano
·
2020
·
IF 14.588
Qingping Wu,Zhenguo Yao,Xuejun Zhou,Jun Xu,Fahai Cao,Chilin Li
A cathode host with strong sulfur/polysulfide confinement and fast redox kinetics is a challenging demand for high-loading lithium–sulfur batteries. Recently, porous carbon hosts derived from metal–organic frameworks (MOFs) have attracted wide attention due to their unique spatial structure and customizable reaction sites. However, the loading and rate performance of Li–S cells are still restricted by the disordered pore distribution and surface catalysis in these hosts. Here, we propose a concept of built-in catalysis to accelerate lithium polysulfide (LiPSs) conversion in confined nanoreactors, i.e., laterally stacked ordered crevice pores encompassed by MoS2-decorated carbon thin layers. The functions of S-fixability and LiPS catalysis in these mesoporous cavity reactors benefit from the 2D interface contact between ultrathin catalytic MoS2 and conductive C pyrolyzed from Al-MOF. The integrated function of adsorption–catalysis–conversion endows the sulfur-infused C@MoS2 electrode with a high initial capacity of 1240 mAh g–1 at 0.2 C, long life cycle stability of at least 1000 cycles at 2 C, and high rate endurance up to 20 C. This electrode also exhibits commercial potential in view of considerable capacity release and reversibility under high sulfur loading (6 mg cm–2 and ∼80 wt %) and lean electrolyte (E/S ratio of 5 μL mg–1). This study provides a promising design solution of a catalysis–conduction 2D interface in a 3D skeleton for high-loading Li–S batteries.
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ACS Applied Nano Materials
·
2019
·
IF 0
Runjiang Guo,Ran Tian,Dongliang Shi,Hua Li,Hezhou Liu
Nowadays, obtaining photocatalysts with a narrow band gap that can degrade contamination under visible light has been a hot topic in the field of environmental protection. In this report, the S-doped hierarchically structured ZnSnO3 with a high S doping ratio, a narrow band gap, and a large specific surface area is synthesized via a two-step hydrothermal method. ZIF-8 was used as the Zn source to synthesize ZnSnO3 with a hollow structure for the first time. Characterization techniques to confirm doping by S in the ZnSnO3 structure include the use of X-ray photoelectron and energy-dispersive spectroscopies. Owing to the hollow-structured ZnSnO3 precursor, S-doped ZnSnO3 demonstrated a large specific surface area (up to 80.63 m2/g) that is favorable for the strong adsorption of reactants. In addition, the S-doping ratio is as high as 90%, which is much higher than that of other related work. Because of the elevated S 3p energy level, the band gap of S-doped ZnSnO3 is rapidly decreased from 3.7 to 2.4 eV, which gives S-doped ZnSnO3 a higher efficiency in the utilization of visible light. Because of the enhanced adsorption capabilities and decreased band gap, the as-synthesized nanocomposite can be used as a high-efficiency photocatalyst for wastewater treatment. About 36% rhodamine B (RhB) is absorbed by S-doped ZnSnO3 even before 350 W Xe-lamp irradiation. After being irradiated under visible light for about 80 min, the RhB is almost completely degraded (degradation efficiency ≈90%) using S-doped ZnSnO3, which is much faster than using pure ZnSnO3 or other zinc–tin oxide-based photocatalysts. In this report, detailed discussions are also given for the synthesis process of hollow-structured ZnSnO3 and the mechanism of narrowing the band gap via S doping.
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