INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Wencai Peng,Guoxin Zheng,Yuanbin Wang,Shiyao Cao,Zhen Ji,Yahuan Huan,Mingqiang Zou,Xiaoqin Yan
The electrochemical splitting of water is considered to be an efficient and potential technique for producing clean hydrogen and oxygen. Although, there are lots of significant developments in composite of superior hydrogen evolution reaction (HER) or oxygen evolution reaction (OER) catalyst applied in water splitting currently, designing non-precious and low-cost bifunctional electrocatalysts with high performance is still an attractive challenging issue. In this article, we report a novel bifunctional electrocatalyst with cobalt-based nanoparticles (NPs) embedded in Zn-doped hierarchical porous three-dimension N-doped carbonization structure via an annealing process of metal organic frameworks (MOFs) connected by N-doped carbon nanotube (denoted as Co–Zn/PNC). This composite structure possesses the characteristics of more active sites, numerous mesopores and high conductivity. The resulting electrocatalyst (Co–Zn/PNC) can be used as both anode and cathode to roust the overall water splitting, getting a current density of 10 mA cm −2 at a cell voltage of 1.63 V in 1.0 M KOH electrolyte.
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高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Tiantian Kang,Haoping Wang,Xiaoju Wang,Liheng Feng
A simple fluorescent probe comprised of coumarin and quinoline units was designed and synthesized through acylhydrazine bonding mode. On account of the “push-pull” structure, the probe exhibits high selectivity and sensitivity for Zn(II) with an obvious red-shift of fluorescence and a visible color change. The detection of Zn(II) by the probe is almost free from interference of other ions and reversible based on intramolecular charge transfer process. Three five-membered rings of the probe with Zn(II) were formed and verified by MS and 1 H NMR spectra. Notably, as a simple, fast and environmentally friendly device, detection of ions by test paper has great practicality, the probe could be designed as test papers for detecting Zn(II) taking advantage of the color change character under 365 nm UV lamps.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Hu Luo,Shaohui Yin,Shuai Huang,Fengjun Chen,Qingchun Tang,Xiaojie Li
Zinc and its alloys are valuable crucial materials applied in the fields of automobile, ship manufacturing and construction industries. However, their application is limited due to poor performance on water-resistance, condensation and anti-icing property. Slippery liquid-infused porous surface (SLIPS) has been widely used owing to excellent water-repellent, condensation and anti-icing properties. In this work, a SLIPS was fabricated based on zinc substrate by using electrochemical etching, low surface energy modification and lubricant infusion, successively. According to the SEM morphologies and EDS images, it could be confirmed that the rough porous surface structure, low surface energy modification and infused lubricants are key factors accounting for the excellent anti-wetting property of fabricated slippery Zn surface. The experimental results showed that the SLIPS on zinc substrate exhibited outstanding water-repellent performance at a wide range of temperature and drop impact velocity. Moreover, its anti-wetting ability can be sustained even under the impacts of droplets or the continuous water jet. Owing to its dropwise condensation strategy, the SLIPS shows reasonable water collection efficiency, which exceeds 60 mg/(cm 2 ·h) at relative humidity of 90%. The excellent anti-icing property is demonstrated by the simulated ice rain test and deicing force test. And the results showed that only tiny residue ice left on the SLIPS and the deicing force was 2–3 times smaller than ordinary surface. The prepared SLIPS is expected to be an adaptable and efficient method for enhancing the water-repellent, condensation and anti-icing properties of zinc substrate, and may expand the application in energy-efficient fluid handing & transportation, medicine and anti-fouling operating in low temperature environment.
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Journal of Energy Storage
·
2024
·
IF 8.9
Yikun Zhou,Junhong Ma,Yang Yuan,Chaoyun Ma,Shaorui Jia,Xinbo Zhang,Guirong Zhang,Xuye Zhou
Aqueous zinc-ion batteries (AZIBs) have a great application prospect in large-scale energy storage, but rampant dendrite growth and continuous side reactions cause the deterioration of zinc electrode performance. Herein, a distinctive additive, sodium p-toluene sulfonate (STS) is shown to enable stable and reversible zinc deposition. Both density functional theory (DFT) calculation and experimental observation demonstrate that STS additive not only can modulate solvation structure to reduce the number of active water molecules, but also is preferentially adsorbed on the Zn(101) plane and guide the preferentially growth of the Zn(002) plane. Moreover, the water-poor electric double layer (EDL) formed on the Zn anode and the reduction of pH value of the electrolyte caused by STS have a positive effect on the inhibition of side reactions. Moreover, the formation of hydrophobic layer and the regulation of pH have a positive effect on the inhibition of side reactions. Consequently, the cycle life of corresponding Zn//Zn symmetric battery with STS additive can reach up to 3500 h at 1 mA cm −2 /1 mAh cm −2 , and >900 h at 5 mA cm −2 /5 mAh cm −2 . Moreover, the STS additive endows the Zn//MnO 2 full cell to achieve an excellent capacity retention rate of 78 % over 800 cycles at 1 A g −1 .
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yiyi Zhang,Minfeng Chen,Junjie Lu,Hong Ma,Wenhui Liu,Jingxuan Yu,Qinghua Tian,Junling Xu,Jizhang Chen
Aqueous zinc-ion batteries hold substantial promise, benefiting from their cost-effectiveness, high safety, and impressive power density. Nonetheless, their performance is compromised by Zn dendrites and by-product formation at the Zn anode. Hydrogel electrolytes are considered a viable solution to these issues. This study proposes to fabricate anisotropic carboxymethyl cellulose hydrogel electrolyte with aligned channels through a straightforward directional freezing technique, aiming to simultaneously achieve good mechanical properties and large ionic conductivity. Meanwhile, Zn(ClO 4 ) 2 is introduced into hydrogel electrolyte to establish ternary hydrogen-bonding network, so as to enhance frost resistance. Thanks to these benefits, the anisotropic hydrogel electrolyte (denoted as Ani-hydrogel) manifests improved Zn 2+ ion transfer, expedited desolvation process, favored planar Zn 2+ ion diffusion, and promoted interfacial kinetics. Accordingly, Zn dendritic growth and parasitic reactions can be efficiently impeded, contributing to significantly improved reversibility of Zn stripping/plating. With the use of Ani-hydrogel electrolyte, the duration of Zn//Zn cell is extended to 1200 h under 2 mA cm −2 and 2 mAh cm −2 , and the Zn//Cu cell can be stably operated for 300 cycles. The Zn//MnO 2 battery with Ani-hydrogel electrolyte delivers superior cyclability at both room temperature and –10 ℃. This study underlines the importance of anisotropic architecture for hydrogel electrolytes.
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ADVANCED MATERIALS
·
2024
·
IF 27.4
Jingmin Zhang,Leo N. Y. Cao,Rongrong Li,Jun Yang,Longwei Li,Kai Yang,Zhong Lin Wang,Xiong Pu
It is commonly accepted that batteries perform better at low current densities below the mass-transport limit, which restricts their current rate and capacity. Here, it is demonstrated that the performance of Zn metal electrodes can be dramatically enhanced at current densities and cut-off capacities exceeding the mass-transport limit by using pulsed-current protocols. These protocols achieve cumulative plating/stripping capacities of 11.0 Ah cm −2 and 3.8 Ah cm −2 at record-high current densities of 80 and 160 mA cm −2 , respectively. The study identifies and understands the promoted (002)-textured Zn growth and suppressed hydrogen evolution based on the thermodynamics and kinetics of competing reactions. Furthermore, the over-limiting pulsed-current protocol enables long-life Zn batteries with high mass loading (29 mg cathode cm −2 ) and high areal capacity (7.9 mAh cm −2 ), outperforming cells using constant-current protocols at equivalent energy and time costs. The work provides a comprehensive understanding of the current-capacity-performance relationship in Zn plating/stripping and offers an effective strategy for dendrite-free metal batteries that meet practical requirements for high capacity and high current rates.
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PubMed
高影响因子
Acta Biomaterialia
·
2024
·
IF 9.4
Sheng Dai,Li Yao,Luying Liu,Jiawei Cui,Zhaogui Su,Ansha Zhao,Ping Yang
Diabetic wound treatment continues to be a significant clinical issue due to higher levels of oxidative stress, susceptibility to bacterial infections, and chronic inflammatory responses during healing. We rationally developed and synthesized an ultra-small carbon dots (C-dots) loaded with zinc single-atom nanozyme (Zn/C-dots) with the aim of promoting wounds healing by nanocatalytic treatment, especially targeting its complex pathological microenvironment. Zinc single atoms and C-dots form a dual catalytic system with higher enzymatic activity. Furthermore, the Zn/C-dots nanozyme effectively enters cells, accumulates at mitochondria, and removes excess ROS, protecting cells from oxidative stress damage and limiting the release of pro-inflammatory cytokines, hence reducing inflammation. Zinc can synergistically increase the antibacterial action of C-dots (the effective antibacterial rate of 100 μg/mL Zn/C-dots was above 90%). Unlike traditional C-dots, Zn/C-dots can cause endothelial cell migration and the formation of new blood vessels. In vitro cytotoxicity, blood compatibility, and in vivo toxicity studies of Zn/C-dots show that they are biocompatible. We subsequently utilized the Zn/C-dots nanozymes to treat diabetic rats' chronic wounds for external use, combining them with ROS-responsive hydrogels to create an antioxidative system (H-Zn/C-dots). The hydrogels anchored the Zn/C-dots nanozymes to the wound, allowing for long-term treatment. The results revealed that H-Zn/C-dots can considerably reduce inflammation, accelerate angiogenesis, collagen deposition, and promote tissue remodeling at the diabetic wound site. After 14 days, the wound area had decreased to approximately 9.19%, making it a potential treatment. Statement of significance An ultra-small carbon dot with a zinc single-atom nanozyme was designed and manufactured. Zn/C-dots possess antibacterial, ROS-scavenging, and angiogenesis activities. In vivo , the multifunctional ROS-responsive hydrogel incorporating Zn/C-dots could speed up diabetic wound healing.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuting He,Junbo Yang,Yi Wang,Yufei Jia,Hongtao Li,Yongning Liu,Liting Liu,Qiang Tan
The metal–nitrogen–carbon (M–N–C)-based catalysts are promising to replace PGM (platinum group metal) to accelerate oxygen reduction reaction due to their excellent electrocatalytic performance. However, the inferior intrinsic activity and poor active site density confining further improvement in their performance. Modulating the electronic structure and reasonably designing the pore structure are widely acknowledged effective strategies to boost the activity of the M–N–C catalysts. However, it is a great challenge to form abundant pores to regulate the electronic structure via the facile method. Herein, a hierarchical, porous dual-atom catalyst FeNi-NPC-1000 has been architectured by the Na2CO3 template method and bimetallic doping modification strategy. Benefitting from the optimized pore and electronic structure, the as-prepared FeNi-NPC-1000 possesses a high specific surface area (1412.8 m2 g–1) and improved ORR activity (E1/2 = 0.877 V vs RHE), which is superior to that of Pt/C (E1/2 = 0.867 V vs RHE). With the evidence of AC-STEM, XAS, and DFT, the FeNi-N8-C moiety is proven to be the key active site to realize high-efficiency ORR catalysis. When assembled it as an air cathode of ZABs, FeNi-NPC-1000 displays superior discharge performance (Pmax = 367.1 mW cm–2) and a stable battery long-life. This article will provide a new strategy for designing dual-metal atomic catalysts applied in metal–air batteries.
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PubMed
高影响因子
AICHE JOURNAL
·
2025
·
IF 4
Hui Wang,Yifan Jin,Yaxin Jin,Siyu Kuang,Tianxiang Yan,Xinyue Wang,Xiao Wang,Wenquan Cui,Sheng Zhang
Electrochemical carbon dioxide reduction reaction (CO 2 RR) is one of the most prospective strategies to achieve carbon neutrality. Multi-carbon compound (C 2+ ) products have higher commercial value and wider applications, among which ethanol is a widely used chemical feedstock and high energy density fuel. Here, we prepared nitrogen-doped carbon nanofibers containing copper-zinc double atoms using the electrospinning technique and controlled the content of both metal atoms by varying the calcination temperature. This catalyst exhibited ultra-high selectivity for ethanol at low potentials. Ethanol selectivity at −0.3 V versus RHE was more than 60% with the total alcohol selectivity of over 80%. Meanwhile, we explored the ethanol production pathway by combining density-functional theory (DFT) and ATR-FTIR spectroscopy, and found that OCCO* intermediates were most abundant for the optimal ratio of Cu to Zn atoms, lowering the energetic barriers to ethanol formation, and thus improving the selectivity of ethanol production.
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高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 34
·8844-8851
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IF 4.696
Sheng Cao,Jialong Zhao,Weiyou Yang,Chengming Li,Jinju Zheng
In the present work, we reported the synthesis of Mn2+-doped Zn–In–S quantum dots (QDs) with high optical performance in a controlled manner. The effects of the temperature, the introduced ODE-S amount and Zn/In ratios in the raw materials, as well as the Mn2+ doping concentrations on the photoluminescence (PL) properties of Mn2+-doped Zn–In–S QDs were investigated systematically. The resultant QDs exhibit tunable bandgaps ranging from 2.9 to 3.7 eV, well-resolved Mn2+ d–d emission with a PL quantum yield (QY) of 56% and a surprisingly long excited state lifetime up to ∼4.2 ms, suggesting their excellent PL properties. Meanwhile, the initial high PL QY of the obtained Mn2+-doped Zn–In–S QDs in organic solvents could be preserved very well once they were transferred into aqueous media via ligand exchange. Furthermore, the as-synthesized QDs exhibit excellent thermal stability up to 200 °C in a crude solution.
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RSC Advances
·
2016
·Vol. 6
·期 101
·99023-99033
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IF 3.289
Guan Gong,Yanhong Liu,Baodong Mao,Bo Wang,Lili Tan,Di Li,Yu Liu,Weidong Shi
In this work, colloidal quantum dots (QDs) of environmentally friendly multinary semiconductor Zn–AgIn5S8 are used for heterostructure photocatalysts with hydrothermally deposited MoS2 focusing on the mechanism study of charge transfer processes in the photocatalytic system. The influence of MoS2 is systematically investigated on the structure, optical properties and photocatalytic activity of the Zn–AgIn5S8/MoS2 nanocomposites, where the compromise of the catalytic activity and light shielding effect and increased stability is observed with increasing MoS2. The optimized Zn–AgIn5S8/MoS2-5% composite exhibits high photocatalytic activity for nearly complete degradation of Rhodamine B within 4 min under visible light irradiation. The composite photocatalysts also show good activity on degradation of other organic pollutants including a colorless antibiotic, tetracycline. Photocatalytic mechanism study proves that the main oxidizing species is the superoxide radical formed by the reaction of photogenerated electrons and oxygen molecules, for which MoS2 mainly acts as a cocatalyst that promotes the electron transfer from the Zn–AgIn5S8 QDs. Time-resolved photoluminescence spectroscopy further reveals the increased charge separation by MoS2 from the photoluminescence quenching and lifetime decrease of the QDs, especially that of the long-lived trap states. Moreover, more efficient charge transfer from the dyes is also observed with Zn–AgIn5S8/MoS2, which is distinctively different from that with the Zn–AgIn5S8 QDs, indicating stronger interaction between the dye and photocatalyst with the introduction of MoS2. Based on these results, a continuous charge flow mechanism is proposed, where the electron transfer can be promoted by MoS2 not only from the QDs but also from the dyes that are all converted to superoxide radicals and contributed to the photocatalytic activity increase.
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CRYSTENGCOMM
·
2016
·Vol. 18
·期 8
·1384-1392
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IF 3.849
S. Ding,X. F. Yang,T. T. Deng,E. H. Song,Z. J. Ma,S. Ye,M. M. Wu,Q. Y. Zhang
Solid-solution phase K(Mn,Zn)F3 mesoporous microspheres have been successfully prepared via a simple one-pot hydrothermal method by using citrate ions as a chelating agent. Effects of the reaction time on the phase transformation and morphological evolution of the K(Mn,Zn)F3 microspheres have been carefully investigated. The results revealed that the hierarchical mesoporous spherical structures with a solid-solution phase were formed from a core–shell structure with mixed phases via the nanoscale Kirkendall effect. It is noted that Yb3+/Er3+-codoped K(Mn,Zn)F3 microspheres exhibit intense single-band red up-conversion emission with environmental responsivity upon excitation using a 980 nm laser diode, indicating a promising potential biomedical application for drug delivery.
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