CORROSION SCIENCE
·
2022
·
IF 7.72
Ling He,Ling Pan,Wei Zhou,Zibo Niu,Peng Xiao,Yang Li
In this work, the corrosion behavior of Yb 4 Hf 3 O 12 ceramics under CFAS coupled with water vapor environment at 1400 °C for 2–50 h was investigated. Results show that the CFAS were rapidly dissolved into ceramics under test environment, and then the Yb-Ca-Si apatite and Hf-rich fluorite phases were re-precipitated. Simultaneously, the water vapor corrosion mainly induced grain surface corrosion, resulting in the formation of corrosion pits and ridge-like structures. Moreover, the pores and microcracks caused by water vapor corrosion offer additional penetration path for CFAS melt.
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Small
·
2022
·Vol. 19
·期 4
·2205681
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IF 15.153
Hui Gao,Jeongyeon Lee,Qixiao Lu,Yoonbin Kim,Kang Ho Shin,Ho Seok Park,Zhonghua Zhang,Lawrence Yoon Suk Lee
Potassium- and sodium-ion batteries (PIBs and SIBs) have great potential as the next-generation energy application owing to the natural abundance of K and Na. Antimony (Sb) is a suitable alloying-type anode for PIBs and SIBs due to its high theoretical capacity and proper operation voltage; yet, the severe volume variation remains a challenge. Herein, a preparation of N-doped carbon-wrapped Sb nanoparticles (L-Sb/NC) using pulsed laser ablation and polydopamine coating techniques, is reported. As the anode for PIB and SIB, the L-Sb/NC delivers superior rate capabilities and excellent cycle stabilities (442.2 and 390.5 mA h g −1 after 250 cycles with the capacity decay of 0.037% and 0.038% per cycle) at the current densities of 0.5 and 1.0 A g −1 , respectively. Operando X-ray diffraction reveals the facilitated and stable potassiation and sodiation mechanisms of L-Sb/NC enabled by its optimal core–shell structure. Furthermore, the SIB full cell fabricated with L-Sb/NC and Na 3 V 2 (PO 4 ) 2 F 3 shows outstanding electrochemical performances, demonstrating its practical energy storage application.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yinan Zhao,Wenhao Yang,Ao Yu,Ping Peng,Fang-Fang Li
Zinc-carbon composite materials are promising anode materials for lithium-ion batteries (LIBs). However, volume expansion of Zn deteriorates the capacity and cycling stability. Fabricating carbon-encapsulated Zn structures represents an effective strategy for mitigating the volume expansion of Zn. In this study, we present a facile molten salt electrolysis approach, in which a liquid Zn anode and CO 2 were strategically utilized to facilitate the synthesis of core–shell Zn@C nanospheres embedded in a honeycomb-like porous carbon matrix (Zn@C/PC). The Zn 2+ ions, generated in-situ through the oxidation of Zn anode surface, undergo co-reduction with the CO 2 -replenished CO 3 2– , resulting in the production of Zn@C/PC series. Benefiting from its composition and structure, the optimal Zn@C/PC shows high reversible capacity (1271 mA h g −1 at 50 mA g −1 ) and superior cycling stability, with a capacity retention rate of 81.4 % after 1250 cycles under 2 A g −1 . The introduced liquid-anode-assisted molten salt electrolysis offers a novel approach for producing high-performance energy storage materials. Moreover, conversion of CO 2 into materials applicable to energy applications represents a promising pathway for advancing carbon neutrality.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Mengyi Zhang,Xiaohui Sun,Xudong Cai,Xiaolu Zhan,Yufei Wu,Xuyang Zhang,Guohua Wu,Xiangwei Wang
In the field of electromagnetic wave (EMW) absorption, carbon matrix materials based on metal–organic frameworks (MOFs) have drawn more interest as a result of their outstanding advantages, such as porous structure, lightweight, controlled morphology, etc. However, how to broaden the effective absorption bandwidth [EAB; reflection loss (RL) ≤ −10 dB] is still a challenge. In this paper, large microsphere structures of a Co/C composite composed of small particle clusters were successfully prepared by the solvothermal method and annealing treatment. At a filling ratio of 40 wt %, the Co/C composite shows attractive microwave absorption (MA) performance after being annealed at 600 °C in an atmosphere of argon. With an EAB of 6.32 GHz (9.92–16.24 GHz) and a thickness of just 2.57 mm, the minimum RL can be attained at −54.55 dB. Most importantly, the EAB can attain 7.12 GHz (10.88–18.0 GHz) when the thickness is 2.38 mm, which is larger than that of the majority of MOF-derived composites. The superior MA performance is strongly related to excellent impedance matching and a higher attenuation constant. This study provides a simple strategy for synthesizing a MOF-derived Co/C composite with a wide EAB.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Gang Li,Ruiyang Tan,Xiangcheng Lu,Xinyu Zhang,Chengcheng Zhang,Bohong Gao,Yuting Zhou,Ke Chen,Ping Chen,Xinyi Wang
Chemical composition and morphological optimization are both effective strategies for constructing excellent electromagnetic wave absorption (EMWA) materials. While efficient EMWA materials derived from both metal-organic frameworks (MOFs) and MXenes have been extensively studied, composites derived from the Hofmann framework with MXene have not been reported. In this study, we employed a Hofmann framework ([Fe(pz)Ni(CN) 4 ], pz = pyrazine) and MXene (Ti 3 C 2 T x ) to create new MXene@Hofmann (MH1 and MH2) composites, using a simple co-precipitation method with two different contents of [Fe(pz)Ni(CN) 4 ]. The FeNi/C/TiO 2 composites with a multi-layered structure inherited from MXene were prepared by annealing the MXene@Hofmann composites at 500, 600, and 700 °C, resulting in the formation of MH1-500/600/700 and MH2-500/600/700 composites. Their compositions, morphologies, electromagnetic parameters, and EMWA performances were characterized. For the composites with a high [Fe(pz)Ni(CN) 4 ] content, MH2-600 has a minimum reflection loss ( RL min ) value of −30.63 dB at a thickness of only 1.8 mm and the broadest effective absorption bandwidth (EAB) of 3.90 GHz at 2.0 mm, while MH2-700 exhibits superior EMWA performance with an RL min value of −34.34 dB at 1.9 mm and an EAB value of 4.96 GHz at 2.1 mm. Their impressive EMWA performance might be attributed to the synergistic dielectric loss and magnetic loss and also the impedance matching from the reasonable ratio of the magnetic and dielectric components. This work demonstrates an effective strategy for constructing EMWA materials from the Hofmann framework and MXene.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Liangri Ying,Fei Liang,Zhen Huang,Jing Ding,Weilong Wang,Shule Liu,Jianfeng Lu
Solar-driven steam generation is widely considered as a promising strategy for desalination. However, before this technology can be practically implemented, certain challenges such as suboptimal steam generation rates and inevitable salt deposition need to be addressed. In this study, we propose a novel bilayer structure aerogel (MS-aerogel), which confines urchin-like MoS 2 /Mo 5 N 6 /C in a biomass gelatin substrate to achieve high-efficiency desalination in high concentration brine solutions. The urchin-like MoS 2 /Mo 5 N 6 /C that hybrid semiconductor MoS 2 , plasmonic Mo 5 N 6 and porous carbon performs superior light-to-heat conversion performance to its individual components. Additionally, under the collaborative action of hydrophilic groups and unique nanostructured surface, the MoS 2 /Mo 5 N 6 /C exhibits a notable reduction in interface evaporation enthalpy from 2405.8 to 1694.6 J g −1 . Taking into consideration the comprehensive thermal management performance, the self-floating MS-aerogel achieves an excellent evaporation rate of 1.89 kg m -2 h −1 under one sun irradiation. Furthermore, the vertically aligned vessels present in the MS-aerogel facilitate salt transportation, effectively preventing crystalline salt accumulation on the evaporator surface. Consequently, even after continuous 12 h desalination in 20 wt% brine, the MS-aerogel maintains an outstanding evaporation rate of 1.54 kg m -2 h −1 , surpassing most reported self-floating evaporators. This research offers a valuable reference for the design of high-efficiency and salt-resistant solar evaporators.
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Science Bulletin
·
2023
·
IF 18.9
Chunlin Xie,Shengfang Liu,Hao Wu,Qi Zhang,Chao Hu,Zefang Yang,Huanhuan Li,Yougen Tang,Haiyan Wang
The development of electrolytes with a wide temperature range, no dendrite growth and corrosion resistance is essential for the practical application of aqueous zinc metal batteries . Herein, γ-valerolactone is developed as the co-solvent to extend the operating temperature range of the aqueous electrolyte and stabilize the zinc metal anode interface. This weak solvent acts as a strong hydrogen bonding ligand and “diluent” to break the hydrogen bonds between free water molecules, thus enhancing the temperature tolerance and chemical stability of the electrolyte. The γ-valerolactone can also be adsorbed on the anode surface to achieve a dendrite-free zinc deposition behavior by promoting zinc nucleation and regulating zinc growth texture. The optimized electrolyte enables the symmetric cell to deliver a cycle/rest life of 2160 h and operate stably over a wide temperature range of −50 to 80 °C. The corresponding Zn||AC and Zn||PANI cells exhibit capacity retention of 92.5% and 85% after 8100 and 1600 cycles, respectively. This mechanism of weak solvent-regulated hydrogen bonding and solvent sheath provides new insights into the design of advanced aqueous electrolytes.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuanzhong Li,Liling Li,Yufa Feng,Huize Wang,Jinyun Liao,Jianwei Ren,Weiyou Zhou,Mingyang He,Hao Li
Engineering and fabricating cost-effective and high-performing bifunctional catalysts for ammonia borane (AB) hydrolysis and methanolysis is paramount for their commercial availability. A series of rattle-structured CuO/Co 3 O 4 @C microsphere bifunctional catalysts for AB hydrolysis and methanolysis were produced using a simple hard template etching approach. The CuO/Co 3 O 4 @C-4 (4 refers to designed the mole ratio of Cu/Co) exhibits the best activity with TOF of 18.8 and 26.8 mol H2 ·mol cat -1 ·min −1 for AB hydrolysis and methanolysis, respectively. It is discovered that the excellent performance is mainly attributed to its unique rattle structure and the synergetic effect between Co 3 O 4 and CuO . Kinetic isotope effect (KIE) experiments and infrared spectroscopy were applied to investigate AB hydrolysis and methanolysis reaction mechanisms. A suggested mechanism for AB methanolysis on rattle-structured CuO/Co 3 O 4 @C-4 is proposed based on the experiment results. This work could provide useful guidance for the construction of high-performance bifunctional catalysts for AB hydrolysis and methanolysis for hydrogen production.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 15
·4400-4408
·
IF 5
Zhengxin Peng,Xiangbowen Du,Nan Lu,Jing Sui,Xiaofan Zhang,Renhong Li,Xiaoqing Yan
The rational design and fabrication of junction-based photocatalysts is of great importance to enhance the photocatalytic efficiency of water splitting. Herein, a new heterophase junction photocatalyst consisting of cubic bixbyite and rhombohedral corundum In2O3 (c-In2O3 and h-In2O3) was readily prepared by directly annealing an InOOH precursor in an inert atmosphere. The resulting c/h-In2O3 heterophase junction photocatalyst showed an optimal hydrogen production rate of 0.73 mmol g−1 h−1 in a 6 h period reaction from alkaline formaldehyde solution in the presence of molecular oxygen under visible light irradiation, which was approximately 5.6 and 3.4 times higher than that of single-component c-In2O3 and h-In2O3, respectively. The superior photocatalytic activity of the c/h-In2O3 heterophase junction was partially attributed to its appropriate band gap and band positions. Spectroscopic characterization and photoelectrochemistry experiments indicated that the heterophase junction photocatalyst could effectively enhance charge separation and transfer abilities between h-In2O3 and c-In2O3. Furthermore, molecular O2 was found to play a key role in mediating the photocatalytic H2 evolution from formaldehyde oxidation as a catalytic electron scavenger, and O2 was not consumed throughout the reaction. Thus, the photocatalytic activity was also greatly enhanced because the adsorption ability of oxygen species was effectively improved after the formation of heterophase junctions.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Enbo Li,Yu Bai,Peng Zhang,Hongxia Liu,Wen Ma,Yingwei Qi,Te Wang,Ziqian Zhang,Sinan Gao
Electronic structure adjustment on materials' surfaces often leads to materials obtaining novel performances. Flake Al powder is a classical low infrared emissivity material at room temperature. However, this powder shows intense infrared radiation over 500 °C due to its high-temperature oxidation , which restricts flake Al powder's application as low infrared radiation material in higher temperatures. For this reason, the Al@ZrO 2 composite was prepared by a solvothermal method to improve its thermostability. This composite can be used as low infrared radiation material over 500 °C for the long term, even at 700 °C for a short time. According to the experimental and theoretical investigation, a delocalization bond of Al–O–Zr is formed in the interface between the Al surface and ZrO 2 so that the Al surface's electronic structure is adjusted. This change of electronic structure weakens the electroaffinity of Al atoms to bond with the electron-rich groups, and the oxidation reaction of Al needs to proceed in a higher-temperature range. In this case, flake Al powder coating with ZrO 2 holds its metal properties with low infrared emissivity over 500 °C. The Al@ZrO 2 composite could be used in a higher temperature range as a low infrared radiation material.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Jialu Pan,Man Li,Feng Zhang,Xiaoran Wang,Yanqing Cong,Shi-Wen Lv
It is of great significance to exploit simple and efficient methods for detecting hazardous substances in the fields related to food safety and environmental protection. Herein, for the first time, a newly-designed hollow Co-N/C nanocage with oxidase-like activity was synthesized via a feasible method. Benefiting from the construction of hollow structure and the introduction of carbon layer , the specific surface area of enzyme mimic was improved, so exposing more active sites. Importantly, hollow Co-N/C nanocage displayed an excellent performance in interfacial charge transfer, which provided convenience for the occurrence of chromatic reaction between enzyme mimic and TMB . As predicted, hollow Co-N/C nanocage can effectively oxidize colorless TMB to blue oxTMB in the absence of H 2 O 2 , and the analyses about catalytic mechanism suggested that both the redox couples of Co 3+ /Co 2+ and O 2 •− were involved in the oxidation of TMB. Furthermore, a chromogenic sensing method for the detection of Na 2 SO 3 and Cr 6+ was exploited, and a broad linear range and a low LOD can be achieved. More interestingly, developed detection method still possessed good recovery even in real samples. In a word, current work will share novel insights into the design of enzyme mimics and the analyses on chromogenic mechanism.
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DYES AND PIGMENTS
·
2022
·
IF 5.122
Bing Liu,Jin Fan,Wenzhao Liu,Guannan Zhang,Zhaoyang Wu
The structural color of photonic crystals is usually whitish and has low saturation due to multiple incoherent scattering effects, limiting its application in practical visual observation. Herein, by controlling the calcination time of [email protected] 2 nanoparticles , we obtain hollow SiO 2 with different in situ generated carbon black contents and assemble them into photonic crystal inks (PCIs). PCIs have excellent saturation and high crystallinity due to the in-situ generated carbon black capable of absorbing incoherently scattered light without affecting particle assembly. PCIs are further converted into non-close-packed photonic crystal films with highly saturated structural colors by photopolymerization of resins. This photonic crystal film can be swollen by an ethanol-water mixture, resulting in structural color changes and shifts in reflection peaks. Moreover, the photonic crystal film can dynamically change from a dry opaque state to an ethanol-wetted translucent state. Such solvent-responsive photonic crystal films with highly saturated structural colors are expected to be used in alcohol sensors and color anti-counterfeiting labels.
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