ANALYST
·
2016
·Vol. 141
·期 8
·2508-2514
·
IF 4.033
Meina Wang,Baozhan Zheng,Feng Yang,Juan Du,Yong Guo,Jianyuan Dai,Lei Yan,Dan Xiao
“Amphiphilic” carbon dots (A-CDs) with a strong green fluorescence emission were synthesized by a simple and green method at room temperature. The characterization demonstrated that the synthesized A-CDs have both hydrophilic and hydrophobic properties and could be dispersed well in aqueous and organic solutions. As a fluorescent probe, the fluorescence of A-CDs could be obviously quenched in the presence of iodine (I2) and the quenching rate is proportional to the concentration of I2. Therefore, the A-CDs could be used as fluorophores for the detection of I2 with higher selectivity and sensitivity, and the linear working range for the I2 sensor is 80 nM–10 μM with a detection limit of 3.5 nM (S/N = 3). More interesting is that IO3− and I− could be transformed to I2 with different sample treatment processes, therefore, the I2 sensor based on A-CDs could also be used for the analysis of iodine species (I2, I− and IO3−) in samples. The possible mechanism has also been discussed in this work, and the high selectivity response to I2 can be attributed to the amphiphilic properties of A-CDs, which bring I2 closer to A-CDs and quench their fluorescence. The proposed I2 sensor has been successfully used for the analysis of iodine species in highly saline water, and the satisfactory results of detection and analysis of iodine species in samples demonstrate that the developed I2 sensor based on A-CDs has potential application in the fields of environment and clinical medicine.
研究领域:
分析化学
·
环境科学
·
医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2024
·
IF 13
Wentao Qu,Jian Zhu,Guozhong Cao,Shulin Chen,Yongwen Tan,Baohui Chen,Ming Zhang
Zinc-iodine batteries (Zn-I2) are extremely attractive as the safe and cost-effective scalable energy storage system in the stationary applications. However, the inefficient redox kinetics and “shuttling effect” of iodine species result in unsatisfactory energy efficiency and short cycle life, hindering their commercialization. In this work, Ni single atoms highly dispersed on carbon fibers is designed and synthesized as iodine anchoring sites and dual catalysts for Zn-I2 batteries, and successfully inhibit the iodine species shuttling and boost dual reaction kinetics. Theoretical calculations indicate that the reinforced d-p orbital hybridization and charge interaction between Ni single-atoms and iodine species effectively enhance the confinement of iodine species. Ni single-atoms also accelerate the iodine conversion reactions with tailored bonding structure of I─I bonds and reduced energy barrier for the dual conversion of iodine species. Consequently, the high-rate performance (180 mAh g −1 at 3 A g −1 ), cycling stability (capacity retention of 74% after 5900 cycles) and high energy efficiency (90% at 3 A g −1 ) are achieved. The work provides an effective strategy for the development of iodine hosts with high catalytic activity for Zn-I2 batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Huimei Pan,Baiyang Chen
Although UV and/or VUV tandem I – are often proposed as advanced reduction processes (ARPs) to eliminate micropollutants by generating e aq – , the fate of I – and its byproducts formation remain to be explored. Therefore, this study investigated the iodine species evolution during UV/I – and UV/VUV/I – processes under different influencing factors. Results show that UV/VUV oxidized most of I – to IO 3 – whereas UV only oxidized a portion of I – to intermediate reactive iodine species (RISs, including I 2 , HOI, and I 3 – ); meanwhile, substantial H 2 O 2 was generated only in UV/VUV/I – process but not in UV/I – process, proving that UV/VUV owns stronger oxidation ability than UV alone. Spiking I – into water exerted triple-sided effects by consuming •OH, generating e aq – , and shielding light, thus complicating the systems. Holistically, increasing pH or decreasing dissolved oxygen converted oxidizing environment into reducing condition and caused less RISs formation, especially for UV/VUV/I – . For oxyhalides , neither UV/I – nor UV/VUV/I – degraded ClO 4 – . While UV/I – cannot remove ClO 3 – , UV/VUV/I – reduced ClO 3 – to Cl – . Expectedly, both UV/I – and UV/VUV/I – reduced BrO 3 – to Br – more efficiently than UV and UV/VUV, confirming that I – can enhance the reduction capacities of UV/VUV and UV technologies .
研究领域:
环境科学
·
水处理
·
化学工程
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Yudan Wang,Xin Zhang,Xue Li,Yaru Jiang,Tianxin Shen,Jinsong Peng,Chunxia Chen,Dengfeng Yu,Gongyuan Zhao
Rechargeable aqueous zinc‑iodine batteries (ZIBs) with low environmental impact and abundant natural reserves have become promising electrochemical energy storage devices. However, the shuttle effect and low conductivity lead to poor electrochemical performance, hindering their practical applications. Herein, a (NH 4 ) 3 PO 4 -activated ZIF-8-derived porous carbon (NPPC) is proposed for entrapping iodine species in ZIBs. Benefiting from its abundant porous structure and highly conductive framework, the iodine loading and electron transport of NPPC is greatly enhanced. In addition, the in-situ doping multiple heteroatoms (N, P and O) in the carbon framework can also establish chemical anchoring with iodine species and hence mitigate the shuttle effect. As a result, the ZIBs prepared by the NPPC-1.5/I 2 electrode achieves an ultra-high specific capacity of 175 mAhg −1 at 0.1 A g −1 , and a specific capacity of 95 mAh g −1 at a high current density of 10 A g −1 . An extremely stable cycle performance of 97 % capacity retaining after 6000 cycles at 10 A g −1 is also obtained. This study provides a new strategy for realizing aqueous ZIBs with high capacity and long cycling life.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Junwei Xu,Jinguo Wang,Linheng Ge,Junru Sun,Wenqing Ma,Manman Ren,Xiaoxia Cai,Weiliang Liu,Jinshui Yao
Rechargeable aqueous zinc–iodine batteries (ZIBs) with low environmental impacts and abundant natural reserves have emerged as promising electrochemical energy storage devices. However, the shuttle effect and low conductivity of the iodine species cause poor electrochemical performance and hinder their practical application. Herein, we propose a ZIF-8 derived porous carbon (ZPC) for iodine species immobilization in ZIBs. The rich porous structure and highly conductive framework of ZPC provide efficient iodine loading and allow the fast transmission of electrons. In addition, the presence of N, Zn and ZnO in the carbon framework can build chemical anchoring with the iodine species to mitigate the shuttle effect. Thus, the ZPC/I 2 cathode exhibits a reversible capacity of 156 mAh g −1 after 100 cycles at 100 mA g −1 and a long-term stability of 1000 cycles at a high rate. This study will open a new paradigm for devolving highly reversible ZIBs.
研究领域:
能源存储
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Yu-gang Shi,Wen-xuan Chen,Mei-zhi Zheng,Yue-xin Zhao,Yi-ran Wang,Yen-Ho Chu,Shao-ting Du,Ze-yu Shi,Qing Gu,Jian-she Chen
While photodynamic inactivation (PDI) has emerged as a novel sterilization strategy for drinking water treatment that recently attracted tremendous attention, its efficiency needs to be further improved. In this study, we aimed to clarify the ultraefficient mechanism by which potassium iodide (KI) potentiates octyl gallate (OG)-mediated PDI against bacteria and biofilms in water. When OG (0.15 mM) and bacteria were exposed to blue light (BL, 420 nm, 210 mW/cm2), complete sterilization (>7.5 Log cfu/mL of killing) was achieved by the addition of KI (250 mM) within only 5 min (63.9 J/cm2). In addition, at lower doses of OG (0.1 mM) with KI (100 mM), the biofilm was completely eradicated within 10 min (127.8 J/cm2). The KI-potentiated mechanism involves in situ rapid photogeneration of a multitude of reactive oxygen species, especially hydroxyl radicals (•OH), reactive iodine species, and new photocytocidal substances (quinone) by multiple photochemical pathways, which led to the destruction of cell membranes and membrane proteins, the cleavage of genomic DNA and extracellular DNA within biofilms, and the degradation of QS signaling molecules. This multitarget synergistic strategy provided new insights into the development of an environmentally friendly, safe, and ultraefficient photodynamic drinking water sterilization technology.
研究领域:
环境科学
·
水处理
·
微生物学
·
光化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bohua Li,Jingning Lai,Fengling Zhang,Wen Sun,Zhengqiang Hu,Boshun Gui,Nan Chen,Li Li,Feng Wu,Renjie Chen
LiI in Li-O 2 batteries has shown promise in reducing charge overpotential. However, the shuttle effect of oxidated iodine species (OISs) can lead to lithium metal corrosion and loss of OISs. During the discharging process, these iodine species can undergo side reactions, resulting in the accumulation of LiOH and other parasitic products, which in turn accelerates battery failure. In this work, we have drawn inspiration from mussel protein and utilized a simple co-deposition method to form a robust biomimetic functionalized coating on the surface of the glass fiber separator. This was achieved by grafting catechol/polyamine (CA/PA) with 11-mercaptoundecanoic acid (MUA). This separator exhibits strong electrostatic repulsion towards negatively charged OISs and, conversely, electrostatic attraction towards Li + , this dual action effectively suppresses the shuttle effect and facilitates Li + transport. When equipped with this modified separator, the Li-O 2 battery effectively reduces the accumulation of LiOH and demonstrates significantly enhanced rate performance and cycle stability. Our findings provide a versatile approach for the design of modified separators for Li-O 2 batteries with redox mediators (RMs).
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）