SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Yang Zhang,Jinchao Shen,Hong Yang,Yan Yang,Zhiguo Zhou,Shiping Yang
A magnetic sensor for Cd 2+ has been developed based on (Zn, Mn)-doped iron oxide nanoparticles [(Zn, Mn)Fe 3 O 4 NPs], which was modified by ethyl 1-(2-(3′,4′-dihydroxyphenyl)-2-oxoethyl)-1H-1,2,3-triazole-4-carboxylate (ETC). ETC provided the binding sites to Cd 2+ to induce the transformation of (Zn, Mn)Fe 3 O 4 NPs from a dispersed to an aggregated state with a corresponding increase in the transverse relaxation time ( T 2 ) of surrounding water protons. Owing to the special strong interaction between ETC and Cd 2+ , ETC coordinated (Zn, Mn)Fe 3 O 4 [(ETC-(Zn, Mn)Fe 3 O 4 )] NPs exhibited a low limit of detection of Cd 2+ of 3.5 nM and a high selectivity over other metal ions . Furthermore, ETC-(Zn, Mn)Fe 3 O 4 NPs can be used to detect Cd 2+ in living cells by magnetic resonance (MR) imaging.
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CHEMISTRY OF MATERIALS
·
2013
·
IF 8.238
Jun Xie,Changzhi Yan,Yu Zhang,Ning Gu
Monodisperse magnetic Mn–Zn ferrite nanostructures with various morphologies have been successfully synthesized via high-temperature decomposition of metal acetylacetonate (acac) in the presence of oleic acid (OA) and oleyamine (OAm). In a classical crystal nucleation/growth process, differential stabilization of OA on specific crystal facets may alter relative crystal growth rates, resulting in the formation of zero-dimensional (0-D) spherical, cubical, and starlike nanocrystals (ca. 9, 11, 16 nm), respectively. Furthermore, shortening nucleation duration might bring a deficient nucleation and a rapid increase in monomer concentration, which accelerates the subsequent growth process of nanocrystals, leading to the formation of the starlike nanocrystals with larger size (ca. 19–23 nm). They are further oriented to assemble reciprocally, gradually forming initial three-dimensional (3-D) “branched” nanoclusters (ca. 30–40 nm) to minimize the magnetostatic energy, owing to their size-dependent magnetic dipolar interaction. In addition, the surface-defect-induced secondary growth of the “branched” nanoclusters may considerably improve their uniformity, accompanied by the size increase in the presence of the monomers, resulting in the final “multibranched” nanoclusters with formation of sharp or obtuse edges (ca. 45–50 nm). Our study reveals the transformation of 0-D nanocrystals to 3-D nanoclusters as well as the shape evolution mechanism, which provide a versatile synthetic strategy for shape-controlled nanostructure. The multibranched nanoclusters have the higher magnetization and magnetically induced heating efficiency in an alternating current magnetic field, which can be used as promising heating agents for biomedical application.
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DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 47
·20763-20768
·
IF 4.197
Lan Wang,Xiaojiao Kang,Lijian Huang,Daocheng Pan
We reported temperature-dependent photoluminescence (PL) studies on Cu–Zn–In–S quantum dot (QD) thin films. In this paper, cadmium-free and luminescent Cu–Zn–In–S quantum dot thin films were in situ formed by thermal decomposition of molecular-based precursors in the open air, without need of the complicated quantum dot synthesis. Molecular-based precursor solutions were prepared by dissolving Cu2O, ZnO, and In(OH)3 in the ethanol solution of butylamine and carbon disulfide. The effects of sintering temperature, sintering time, and the concentration of capping agents on the photoluminescence properties of Cu–Zn–In–S QD thin films have been systematically investigated. It was found that alkali metal ions play an important role in enhancing the PL quantum yield of quantum dot thin films. The as-prepared QD thin films show composition-tunable emission in the range of 535 nm to 677 nm, and the absolute PL quantum yields can reach as high as 22.1%. All of the as-deposited QD thin films show a single-exponential decay to temperature, indicating that these cadmium-free QD thin films have high potential as temperature probes.
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Journal of Cleaner Production
·
2024
·
IF 9.7
Wanru Feng,Jingya Zhang,Jianguo Mi,Junsu Jin,Guolei Xiang,Hong Meng,Shisen Xu
The synthesis of structured CO 2 adsorbents with high separation selectivity, strong stability, and low cost to meet industrial needs is very challenging. Here, we synthesized an ultra-stable Zn-MOF (Zn 2 (3-amion-1,2,4-triazolate) 2 (oxalate), Zn 2 (Atz) 2 Ox), and adopted an efficient in-situ growth strategy to produce millimeter-sized spherical Zn 2 (Atz) 2 Ox@AFP (Amino-Functionalization Poly(acrylates), AFP) composite. Due to the heterogeneous crystallization induced by the nanoscale crystal seeds and the confined space of AFP, the three-dimensional (3D) Zn 2 (Atz) 2 Ox bulk crystals transformed into 2D nanosheets with higher CO 2 adsorption efficiency and faster kinetics. Zn 2 (Atz) 2 Ox@AFP has a high affinity for CO 2 (2.05 mmol g −1 at 0.05 bar and 313 K) while exhibiting an inhibitory effect for N 2 (only 0.051 mmol g −1 at 1.0 bar and 313 K), leading to an excellent ideal adsorbed solution theory (IAST) selectivity (2990 for CO 2 /N 2 (5/95, v/v)). Interestingly, Zn 2 (Atz) 2 Ox@AFP exhibits a unique gating effect on CH 4 adsorption, which further extends its application range to natural gas purification. Dynamic breakthrough experiments confirmed that Zn 2 (Atz) 2 Ox@AFP can selectively capture CO 2 in the simulated CO 2 /N 2 (5/95) and CO 2 /CH 4 (5/95) mixed gases.
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Small Structures
·
2024
·Vol. 5
·期 10
·2400180
·
IF 13.9
Zihao Zheng,Wanke Cheng,Geyuan Jiang,Xiaona Li,Jinsong Sun,Ying Zhu,Dawei Zhao,Haipeng Yu
The evolution of flexible Zn-ion batteries (FZIBs) significantly hinges on the development of gel electrolytes, characterized by their mechanical properties, ionic conductivity, and environmentally friendly production processes. The prevailing challenge in this domain has been devising a gel electrolyte that encapsulates all these critical attributes effectively for practical application. This study presents a novel zinc ion gel (Zn-gel) electrolyte developed for FZIBs, synthesized via ethanol vapor-induced assembly of cellulose molecules. This innovative process fosters significant hydrogen bonding and ion-complexation with Zn 2+ ions, resulting in a gel with exceptional mechanical strength (0.88 MPa), high ion transference (over 0.7), and impressive ionic conductivity (8.39 mS cm −1 ). The Zn-gel enables a FZIB to achieve a reversible capacity of 207.3 mAh g −1 and over 93% Coulombic efficiency after 500 cycles, devoid of liquid electrolyte. Highlighting a promising route for high-performance, eco-friendly gel electrolytes, this research advances flexible electronics and portable device applications, demonstrating the profound potential of bio-based polymers in enhancing energy storage technology.
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Advanced Science
·
2024
·
IF 14.3
Jinxian Feng,Chunfa Liu,Lulu Qiao,Keyu An,Sen Lin,Weng Fai Ip,Hui Pan
Electrolyte plays crucial roles in electrochemical CO 2 reduction reaction (e-CO 2 RR), yet how it affects the e-CO 2 RR performance still being unclarified. In this work, it is reported that Sn-Zn hybrid oxide enables excellent CO 2 -to-HCOO − conversion in KHCO 3 with a HCOO − Faraday efficiency ≈89%, a yield rate ≈0.58 mmol cm −2 h −1 and a stability up to ≈60 h at −0.93 V, which are higher than those in NaHCO 3 and K 2 SO 4 . Systematical characterizations unveil that the surface reconstruction on Sn-Zn greatly depends on the electrolyte using: the Sn-SnO 2 /ZnO, the ZnO encapsulated Sn-SnO 2 /ZnO and the Sn-SnO 2 /Zn-ZnO are reconstructed on the surface by KHCO 3 , NaHCO 3 and K 2 SO 4 , respectively. The improved CO 2 -to-HCOO − performance in KHCO 3 is highly attributed to the reconstructed Sn-SnO 2 /ZnO, which can enhance the charge transportation, promote the CO 2 adsorption and optimize the adsorption configuration, accumulate the protons by enhancing water adsorption/cleavage and limit the hydrogen evolution. The findings may provide insightful understanding on the relationship between electrolyte and surface reconstruction in e-CO 2 RR and guide the design of novel electrocatalyst for effective CO 2 reduction.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Fulong Zhu,Zhengcheng Hu,Wei Guo,Yongzhu Fu
Alkaline zinc-iron flow batteries (ZFBs) have recently attracted renewed attention. However, the critical issues with zinc anodes, such as dendrite formation, side reactions, and labile plating or stripping, have yet to be adequately addressed. Here, an attempt is made to overcome these challenges by designing Boron-doped carbon-felt (B–CF) electrodes rich in electron-deficient sites and defects. The fabricated B–CF provides improved adsorption of negatively charged Zn(OH) 4 2− , robust Zn nucleation sites, and lower Zn nucleation and deposition overpotentials, leading to homogeneous Zn deposition morphology. Uniform Zn deposition enables the prevention of undesirable dendrite growth and parasitic reactions. As a result, the constructed alkaline ZFBs achieve a high average Coulombic efficiency of ≈99.85% and energy efficiency of 88% with uniform Zn deposition during 300 cycles (40 mA cm −2 ). This work expands the understanding of the electrode design strategy for achieving favorable Zn plating/stripping.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Liang Chen,Jialin Zhao,Jinlong Li,Yan Zhuang,Dongxuan Guo,Shuang Meng,Dantong Zhang,Xue Yang,Guozhe Sui
Bimetallic-organic frameworks and their derivatives have attracted intensive attention in the field of photocatalytic hydrogen production due to their high porosity, distinctive three-dimensional structure, and favorable specific surface area. Despite these advantages, the efficiency of photocatalytic hydrogen production remains unsatisfactory owing to rapid complexation of electron-hole pairs and limited visible light utilization. Herein, in this work, the autogenous CuO–ZnO heterojunction nanoparticles are assembled on the surface of reduced graphene oxide (RGO) by calcining copper-zinc bimetallic-organic frameworks. The autogenous heterojunctions offer numerous active sites and enhance electron transfer at tightly bound heterogeneous interfaces. Furthermore, RGO acts as a co-catalyst or substrate, improving photocatalytic performance with its high surface area and excellent electron transport properties. Consequently, the RGO/CuO–ZnO Z-scheme heterojunction achieves an impressive hydrogen production rate of 479.73 μmol g −1 h −1 , which is 94.06 times higher than that of pristine ZnO. Overall, this work optimizes the potential of metal-organic framework-derived photocatalysts in hydrogen production and offers valuable insights into the effective construction of autogenous heterojunctions.
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LANGMUIR
·
2024
·
IF 3.7
Zhe Zheng,Kaiyu Dong,Xiaotong Yang,Qiang Yuan
Metallenes have received sustained attention owing to their unique microstructure characteristics and compelling catalytic applications, but the synthesis of multielement crystalline–amorphous metallenes remains a formidable challenge. Herein, we report a one-step wet chemical reduction method to synthesize composition-tunable crystalline–amorphous heterophase PdMoCrW tetrametallene. As-synthesized PdMoCrW tetrametallene is composed of approximately six to seven atomic layers and has flexible crimpiness, a crystalline–amorphous heterophase structure, and high-valence metal species. Time-dependent experiments show that PdMoCrW tetrametallene follows a three-step growth mechanism that includes nucleation, lateral growth, and atom diffusion, respectively. The novel ultrathin structure, optimized Pd electronic structure, and hydrophilic surface together greatly promote the activity and stability of PdMoCrW tetrametallene in the alkaline oxygen reduction reaction. Pd75.9Mo9.4Cr8.9W5.8/C exhibits excellent mass and specific activities of 2.81 A mgPd–1 and 4.05 mA cm–2, which are 20.07/14.46 and 23.42/16.20 times higher than those of commercial Pt/C and Pd/C, respectively. Furthermore, a Zn–air battery assembled using Pd75.9Mo9.4Cr8.9W5.8/C as a cathode catalyst achieves a peak power density of 156 mW cm–2 and an ultralong durability of 329 h. This study reports an effective strategy for constructing crystalline–amorphous quaternary metallenes to advance non-Pt electrocatalysts toward oxygen reduction reaction (ORR) performance and for a Zn–air battery.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jingwen Liu,Junfeng Ren,Yongkang Li,Yuchen Wang,Caixia Li,Zexing Wu,Jianping Lai,Yu Yang,Lei Wang
Organic acid treatment can facilitate the in-situ formation of a solid electrolyte interface (SEI) on Zn foil protecting the anode from corrosion. However, the generation of hydrogen (H 2 ) during this process is inevitable, which is often considered detrimental to getting compact SEI. Herein, a H 2 film-assisted method is proposed under concentrated Amino-Trimethylene-Phosphonic-Acid to construct ultrathin and dense SEI within 1 min. Specifically, the (0 0 2) crystal planes survive from the etching process of 1 min due to the adhered H 2 , inducing uniform deposition and enhanced corrosion-resistance. Moreover, the H 2 can effectively regulate the reaction rate, leading to ultrathin SEI and initiating a morphology preservation behavior, which has been neglected by the previous reports. The quick-formed SEI has excellent compatibility, low resistance and effective isolation of electrolyte/anode, whose advantages work together with exposed (0 0 2) planes to get accustomed to high-current surge, leading to the ZAC1@Zn//ZAC1@Zn consistently cycling over 800 h at 15 mA cm −2 and 15 mAh cm −2 , the ZAC1@Zn//Cu preserves high reversibility (CE 99.7 %), and the ZAC1@Zn//MVO exhibits notable capacity retention at 191.7 mAh/g after 1000 cycles.
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MOLECULES
·
2024
·Vol. 29
·期 10
·2349
·
IF 4.2
Ziwei Deng,Wei Liu,Junyuan Zhang,Shuli Bai,Changyu Liu,Mengchen Zhang,Chao Peng,Xiaolong Xu,Jianbo Jia
A Fe-Co dual-metal co-doped N containing the carbon composite (FeCo-HNC) was prepared by adjusting the ratio of iron to cobalt as well as the pyrolysis temperature with the assistance of functionalized silica template. Fe1Co-HNC, which was formed with 1D carbon nanotubes and 2D carbon nanosheets including a rich mesoporous structure, exhibited outstanding oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalytic activities. The ORR half-wave potential is 0.86 V (vs. reversible hydrogen electrode, RHE), and the OER overpotential is 0.76 V at 10 mA cm−2with the Fe1Co-HNC catalyst. It also displayed superior performance in zinc–air batteries. This method provides a promising strategy for the fabrication of efficient transition metal-based carbon catalysts.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ruihan Xiang,Baibin Yang,Qiannan Yu,Kefei Wang,Caihong Wang,Yong Wu,Shuai Tan
Developing hydrogel electrolytes with excellent deformability and desirable conductivity is of paramount importance in improving flexible solid-state aqueous energy devices. Herein high-alkali contained poly (sodium acrylate) hydrogel electrolytes with high conductivities, soft deformability, and considerable freezing resistance are designed and developed for flexible Zn-air batteries. The electrolytes are simply prepared by swelling a high content of 5 M KOH solutions within a homogenous crosslinked poly (sodium acrylate) network. The homogenous crosslinked networks in the electrolytes ensure robust fracture toughness (600 J m −2 ) during diverse deformation, while the high content of KOH solutions (80 wt%) enable soft feature of low Young’s modulus (1.4 kPa), desirable ion conductivity (246 mS cm −1 ), and anti-freezing performance (<-30 °C) for the electrolytes. Based on these, the derived Zn-air batteries show satisfactory energy density (0.1 W cm −2 ), multiple flexibility, and wide operating temperatures (−30 °C to r.t.), which are practically applied as flexible energy-consuming devices in different situations. The work here provides a promising approach to develop desirable hydrogel electrolytes for various alkaline energy devices.
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