SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Jiali Fu,Pu Huang,Yafei Guo,Kaizhuo Fan,Zixuan Wang,Xinlei Xie,Jun Yu,Chuanwen Zhao
Integrating calcium-looping cycle (CaL) with reverse-water–gas-shift (RWGS) reaction represents an effective path to realizing integrated CO 2 capture and utilization (ICCU). Screening a suitable catalyst to construct highly efficient CaO-based dual function materials (DFMs) is essential for CaL-RWGS. In the current work, M@CaO (M = Ni, Co, Mn, and Fe) DFMs are prepared for CaL-RWGS, and the influence of catalyst component on the structure, CO 2 capture and RWGS performance, and kinetic behaviors of the CaO-based DFMs is investigated. Results show that the interaction between CaO and catalyst affects the average grain size and dispersion of metallic catalyst, oxygen vacancy concentration, surface basicity, and reducibility of CaO-based DFMs. The desired Mn@CaO DFMs exhibit outstanding CaL-RWGS performance at 650 °C, 15%CO 2 and 50%H 2 , with a great CO 2 uptake (12.30 mmol CO 2 /g), a favorable CO yield (5.92 mmol CO/g), and an impressive CO 2 conversion (53.53%), as well as a high CO selectivity (89.98%). Furthermore, Mn@CaO exhibits excellent carbonation and regeneration kinetics but inferior working stability for CO 2 capture and CO production in multiple CaL-RWGS cycles. Overall, Mn could be a competitive and cost-effective catalyst candidate for high-performance CaO-based DFMs for CaL-RWGS applications, while further work is needed to improve cyclic stability.
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HYDROMETALLURGY
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2023
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IF 4.7
Lianghong Duan,Shenghai Yang,Yongming Chen,Changhong Wang
Ammonia system shows great potential in the treatment of zinc secondary resource, and electrodeposition has been confirmed as a vital process to extract zinc from the ammonia leachate. However, the ammonia system-based zinc electrodeposition is either inefficient or the zinc deposit in of undesired quality. This study proposes a polyethylene glycol 20,000 (PEG20000 polymer of formula H(OCH 2 CH 2 ) n OH)-assisted ammonia system to conduct high-quality and efficient zinc electrodeposition. The practical operation achieved a low electrical energy consumption of 2391 kW h t −1 Zn and a high current efficiency of 99%, with a smooth and compact zinc deposit of fine (30.2 nm) grains. Further investigation of electrodeposition behavior revealed the following: (i) deposition principle, (ii) diffusion property, and (iii) three-dimensional (3D) instantaneous nucleation mode, and provided a useful reference for guiding the process design and conditions of the practical operation. In general, PEG20000-assisted ammonia system turns out to be a technically and economically viable option to electro-deposit zinc, for its high energy competitiveness and high-quality Zn products.
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ChemNanoMat
·
2023
·Vol. 10
·期 3
·e202300479
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IF 3.8
Zijian Wang,Mengdie Li,Mingjiao Xiao,Yanze Wei,Ranbo Yu,Zumin Wang
Graphical Tiny NiP nanoparticles dispersed was used as an inexpensive, stable, and active cocatalysts on ultrathin Nb 2 O 5 nanosheets to replace the noble metal Pt. Owing to the extended light harvesting, enhanced carrier separation, and improved surface reaction, the NiP/Nb 2 O 5 exhibits even higher activity and selectivity towards CO 2 photocatalytic reduction. And the roles and function mechanisms of the cocatalyst were studied. Photocatalytic CO 2 reduction holds great promise to solve energy shortage and global warming. Nb 2 O 5 has demonstrated superiority in CO 2 activation and selectivity regulation, but suffers from poor light absorption ability and fast carrier recombination. To tackle these problems, we designed and synthesized ultrathin Nb 2 O 5 nanosheets which were decorated with tiny NiP nanoparticles as cocatalyst. In this way, light absorption range broadened, carrier migration distance reduced, charge transfer resistance decreased, and surface reaction kinetics promoted. Consequently, the as-prepared NiP/Nb 2 O 5 showed notably enhanced activity (148.7 μmol ⋅ g −1 ) and selectivity (82.1 %) towards CO, as well as remarkable stability. This work paves the way for cheap and earth abundant alternatives as cocatalysts and deepens the understanding of their functions in CO 2 photoreduction.
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高影响因子
ACS Applied Nano Materials
·
2023
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IF 5.9
Xinyi Chen,Gang Cao,Xinyun Wang,Hao Fang,Pengpeng Chen,Ying Xu,Wangyan Nie,Shaohua Zeng,Yifeng Zhou
The application of polyvinyl alcohol (PVA) films is still restricted due to their poor hydrophilicity, mechanical strength, and thermal stability. To improve these properties, a teardrop-shaped hollow polystyrene (HPS) nanoparticle was prepared in this work and further applied as the reinforcing nanomaterial. Herein, a teardrop-shaped silica nanoparticle was first used as the hard template; polystyrene was in situ-synthesized on the surface of teardrop-shaped silica, followed by the etching of the silica template. By tuning the synthesis parameters (e.g., styrene concentration and etching time), the optimal structure of HPS was obtained; subsequently, HPS was mixed with PVA by a solution-mixing method, which in turn produced the PVA-based synthetic foam film. Using optimal synthesis parameters of HPS and its loadings, the obtained syntactic foam films exhibited high transparency, excellent mechanical strength and toughness, and good thermal stability. Compared to pure PVA film, the tensile strength and toughness of PVA-based syntactic foam films containing 1.0 wt % HPS were improved by about 55 and 77%, respectively; the glass transition temperature and onset decomposition temperature of PVA-based syntactic foam films increased to about 32 and 66 °C, respectively. The research exemplifies the great promise of HPS toward practical application in polymer syntactic foams.
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Nano Energy
·
2023
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IF 17.6
Rumin Fu,Xinxiang Zhong,Cairong Xiao,Jian Lin,Youjun Guan,Yu Tian,Zhengnan Zhou,Guoxin Tan,Huabin Hu,Lei Zhou,Chengyun Ning
Piezoelectric hydrogel-based sensors have emerged as a promising technology for accurately monitoring various physiological signals of the human body without the need for an external power source . The multichannel wireless sensing systems with high data acquisition efficiency and low maintenance cost markedly broaden the application of wearable sensors . However, the challenges that these sensors face is that the low voltage output can cause the output signal to be easily covered by noise when used in a multi-signal acquisition system. Here, a stretchable, biocompatible, piezoelectric hydrogel sensor is fabricated and integrated with self-developed signal processing/transmission modules to obtain a multichannel wireless sensing system. Furthermore, the system can stably and real-time wirelessly monitor physiological signals of the human body. Overall, this work represents a significant advancement in the field of piezoelectric hydrogel-based wireless multichannel sensing systems and has the potential to be applied in a wide range of complex scenarios.
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OPTICAL MATERIALS
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2023
·
IF 3.9
Meiting Li,Bo Chen,Chi Zhang,Xuejiao Wang,Fufa Wu,Rongda Zhao
Tartrate (Tar 2− ) was originally employed as a chelating/structure-directing agent for hydrothermal synthesis of CdWO 4 :Yb 3+ ,RE 3+ (RE = Ho and Er) micro/nanocrystallites, followed by calcination at 700 °C for 2 h. It was clearly demonstrated that Tar 2− restricted the exposed ab planes and 3D self-assembly of microplates, resulting in ∼50 nm sized nanoparticles . Up-/down-conversion (UC/DC) photoluminescence were revealed to be strongly size dependent. Under 978 nm pump laser excitation, flower-like assembly was found to exhibit the stronger UC emissions of Ho 3+ and Er 3+ , among which two CdWO 4 :Yb 3+ ,Ho 3+ phosphors generated orange-yellow fluorescence via three-photon processes, while CdWO 4 :Yb 3+ ,Er 3+ microflowers and nanoparticles showed yellowish-green and pale green colors, respectively. Moreover, nanoparticles intensified the dominant green DC emissions of Ho 3+ and Er 3+ by ∼3 and 2 times, implying the pivotal roles of morphology engineering in tunable photoluminescence . This research may provide insights into crystallite/architecture engineering and luminescence optimization for near-infrared response solar cells and solid-state lighting.
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ACS Catalysis
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2023
·
IF 12.9
Jielin Wang,Xin Li,Shujie Shen,Ruimin Chen,Qin Ren,Jieyuan Li,Fan Dong
Molecular oxygen (O2) activation has been utilized as a feasible approach to promoting the oxidative capacity of general environmental and energy catalytic reactions. However, the selectivity of oxidation reactions regulated by quantification of molecular O2 activation has not yet been clarified. By adjusting the concentration of dissolved oxygen (CDO), the quantified provision of molecular O2 can be facilely accomplished, which could directly regulate the production of reactive oxygen species (ROS) for targeted oxidative products. Herein, by taking ammonia oxidation as a typical multielectron-involved reaction, the selectivity is precisely tailored by quantified activation of molecular O2, in which P25 is utilized as the photocatalyst. Under the sufficient provision of molecular O2 activation (CDO = 20.0 mg L–1), the deep oxidation of NH3 into NOx– (NO2– and NO3–) is achieved via the ROS-driven mechanism. In contrast, selective production of N2 from partial NH3 oxidation is noted along with the h+-driven direct oxidation mechanism (CDO = 0.1 mg L–1). Then comprehensive in situ characterization under different CDO and theoretical calculations are combined, revealing that the regulation of product selectivity by quantified provision of the O2 can be attributed to the selective generation of ROS. It is proposed that the strategy of quantified activation of molecular O2 can be developed as an effective method, which offers opportunities for regulating the oxidation selectivity for important environmental and energy reactions.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Shengqiu Zhao,Yucong Liao,Rui Wang,Guoliang Liu,Haining Zhang,Haolin Tang
The chemical degradation of proton exchange membranes (PEMs) suffering from radical attack is a crucial issue in the development of proton exchange membrane fuel cells (PEMFCs), while incorporating cerium oxide (CeO 2 ) nanoparticles (NPs) with regenerative redox properties to eliminate radicals could effectively alleviate degradation. However, the low stability and restricted activity of CeO 2 in the PEMFC operating condition and the poor compatibility with PEM due to CeO 2 agglomeration stimulate the urgency for structural modulation of CeO 2 . Achieving a balance of membrane performance and oxidation resistance through a rational surface modification strategy of CeO 2 is important for expanding PEMFC applications. Herein, polyphenols surface functionalized CeO 2 core-shell structure (CeO 2 @TP) were constructed via assembling oxidation-induced coupling tea polyphenols (TP) on CeO 2 NPs. The TP oligomeric shell as a protective layer enhances the stability of CeO 2 , mitigating radical scavenging activity degradation and improving compatibility with PEMs. Physicochemical characterisation shows that the overall performance of the nanocomposite membrane is improved due to the interaction of CeO 2 @TP nanoparticles with the polymer matrix. Gratifyingly, the phenolic hydroxyl-rich reductive TP oligomeric shell accelerates the regeneration of Ce(IV) to Ce(III), increasing the proportion of Ce(III) and oxygen vacancies on the CeO 2 surface, thus boosting antioxidation efficiency. As a result, the CeO 2 @TP-based PEMs exhibited an OCV decay rate of 0.22 mV h −1 , a maximum power density of 1.06 W cm −2 , an H 2 crossover value of 2.18 mA cm −2 , thickness retention (91.1%), and negligible Ce migration after 404 h of accelerated degradation testing. It is proven that the desired consequences of doping antioxidants in PFSA matrix can be intensified by surface modulation of the physicochemical properties of CeO 2 .
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SmartMat
·
2023
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IF 20.4
Zongxiao Wu,Junlei Qi,Wenbin Wang,Peng Yang,Chen Ma,Haoxin Huang,Kai Bao,Jingkun Wu,Chengxuan Ke,Ye Chen,Chaoliang Tan,D. V. Maheswar Repaka,Qiyuan He
The remarkable successes of graphene have sparked increasing interest in elemental two-dimensional (2D) materials, also referred to as Xenes. Due to their chemical simplicity and appealing physiochemical properties, Xenes have shown particular potential for numerous (opto) electronic, iontronic, and energy applications. Among them, layered α-phase tellurene has demonstrated the most promise, thanks to the recent successes in the chemical synthesis of highly crystalline 2D tellurene. However, the general electronic and electrochemical properties of tellurene in electrolyte systems remain ambiguous, hindering their further development. In this work, we studied the electrostatic gating, electrocatalysis, and electrochemical stability of tellurene in electrolyte systems. Our results show that tellurene obtained from both hydrothermal and chemical vapor deposition methods, two mainstream synthetic approaches for Xenes, demonstrates thickness-dependent ambipolar transport with high hole mobility and stability in both aqueous electrolytes and ionic liquids. More importantly, the electrochemical properties of tellurene are investigated via the emerging on-chip electrochemistry. Pristine tellurene demonstrates hydrogen evolution reaction with low Tafel slopes and remarkable electrochemical stability in acidic electrolytes over a large potential window. Our study provides a comprehensive understanding of the iontronic and electrochemical properties of tellurene, paving the way for the broad adoption of Xenes in sensors, synaptic devices, and electrocatalysis.
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Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-16
·
IF 26.6
Su Zhe,Yi Shan,Zhang Wanyu,Xu Xiaxi,Zhang Yayun,Zhou Shenghu,Niu Bo,Long Donghui
The integration of nano-semiconductors into electromagnetic wave absorption materials is a highly desirable strategy for intensifying dielectric polarization loss; achieving high-attenuation microwave absorption and realizing in-depth comprehension of dielectric loss mechanisms remain challenges. Herein, ultrafine oxygen vacancy-rich Nb 2 O 5 semiconductors are confined in carbon nanosheets (ov-Nb 2 O 5 /CNS) to boost dielectric polarization and achieve high attenuation. The polarization relaxation, electromagnetic response, and impedance matching of the ov-Nb 2 O 5 /CNS are significantly facilitated by the Nb 2 O 5 semiconductors with rich oxygen vacancies, which consequently realizes an extremely high attenuation performance of − 80.8 dB (> 99.999999% wave absorption) at 2.76 mm. As a dielectric polarization center, abundant Nb 2 O 5 –carbon heterointerfaces can intensify interfacial polarization loss to strengthen dielectric polarization, and the presence of oxygen vacancies endows Nb 2 O 5 semiconductors with abundant charge separation sites to reinforce electric dipole polarization. Moreover, the three-dimensional reconstruction of the absorber using microcomputer tomography technology provides insight into the intensification of the unique lamellar morphology regarding multiple reflection and scattering dissipation characteristics. Additionally, ov-Nb 2 O 5 /CNS demonstrates excellent application potential by curing into a microwave-absorbing, machinable, and heat-dissipating plate. This work provides insight into the dielectric polarization loss mechanisms of nano-semiconductor/carbon composites and inspires the design of high-performance microwave absorption materials.
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PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Yanhua Lei,Bochen Jiang,Hui Liu,Fei Zhang,Yan An,Yuliang Zhang,Yuan Yuan,Jingxiang Xu,Xiaofeng Li,Tao Liu
The development of superhydrophobic coatings with excellent mechanical properties is essential for effective anti-icing protection. In this study, we achieved a durable superhydrophobic anti-icing coating by introducing the nanosilica , co-modified with fluoroalkyl silane and aminosilane, into polyurethane through a simple spraying and curing process. The resulting coating had a water contact angle (CA) of up to 162° and a sliding angle (SA) less than 1.5°. We enhanced the mechanical and chemical durability of the coating by reacting amino groups on the silica surface with the isocyanate groups in the curing agent. The coating maintained its superhydrophobicity even after 200 cycles of sandpaper abrasion, 24 h of water impact, or 500 ml of falling sand impact. Additionally, the coating exhibited excellent anti-icing performance, delaying the water-freezing time to 700 s at −15°, and the ice-adhesion strength remained lower than 13 KPa after 25 icing-deicing cycles. These results suggest that the durable superhydrophobic coatings can effectively prevent long-term icing, making them as promising anti-icing candidates for various applications in polar ships.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Hui Zhao,Feifei Nie,Shuhui Liu,Yuanhao Li,Kezhong Wu,Mingxing Wu
Molybdenum-based carbides , as one of the representatives of transition metal compounds, are a promising alternative to the expensive and resource constrained Pt-based counter electrode (CE) in dye-sensitized solar cells (DSSCs). Herein, a series of hierarchical α-MoC 1- x @N-doped carbon (MDNC) composites are transformed from the step-by-step pyrolysis of uniformly Mo-based compounds and dopamine precursors at the temperatures of 650, 750, 850, and 950 °C under N 2 atmosphere, respectively. The MDNC precursors were synthesized by a simple one-step self-polymerization in a water-in-oil system. And then, the obtained MDNC nanocrystalline composites can accelerate electron conduction and improve the electrocatalytic property of the tri-iodide reduction reaction (IRR) owing to the C carrier obtained through the pyrolysis process and the N-doped of α-MoC 1- x by the carbonization of dopamine and the high temperature nitrogen atmosphere. In addition, the distinct hierarchical structure of MDNC with well-developed porosity and high specific surface area can expose numerous active catalytic sites. The DSSCs using the MDNC series as CEs for I 3 − /I − exhibit power conversion efficiencies (PCE) of 5.99 %, 6.35 %, 6.57 % and 5.57 %, respectively, which were versus 5.83 % of Pt CE.
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