ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 37
·1800791
·
IF 13.325
Peng Long,Yiyu Feng,Chen Cao,Yu Li,Junkai Han,Shuangwen Li,Cong Peng,Zeyu Li,Wei Feng
The unstable triplet excited state is a core problem when developing self-protective room temperature phosphorescence (RTP) in carbon dots (CDs). Here, fluorine and nitrogen codoped carbon dots (FNCDs) with long-lived triplet excited states, emitting pH-stabilized blue fluorescence and pH-responsive green self-protective RTP, are reported for the first time. The self-protective RTP of FNCDs arises from n–π * electron transitions for C N/CN bonds with a small energy gap between singlet and triplet states at room temperature. Moreover, the interdot/intradot hydrogen bonds and steric protection of C F bonds reduce quenching of RTP by oxygen at room temperature. The RTP emission of FNCDs shows outstanding reversibility, while the blue fluorescence emission has good pH stability. Based on these FNCDs, a data encoding/reading strategy for advanced anticounterfeiting is proposed via time-resolved luminescence imaging techniques, as well as steganography of complex patterns.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 85
·69854-69860
·
IF 3.84
Suyun Tian,Jing Sun,Siwei Yang,Peng He,Shengju Ding,Guqiao Ding,Xiaoming Xie
Rapid thermal exfoliation/reduction of graphite oxide is a fast and easy method among the oxidation–reduction approaches for graphene synthesis. In this research, we firstly demonstrated that graphene can be obtained with a surface area of 550 to 700 m2 g−1 and a yield of approximately 50% through one-step rapid thermal treatment in air from 450 to 550 °C, without vacuum or protective gas through a self-protection process. Then, we further demonstrated the effective two-step thermal annealing to significantly improve the C/O ratio from ca. 7.3 to 25.9 in air at the relatively low temperature of 600 °C. The smart self-protecting and enhanced-oxygen-removal mechanisms were discussed.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Huamin Li,Ying Zhang,Haidi Wu,Zhanqi Liu,Cheng Guan,Jin Zhang,Jingyi Chen,Shaohua He,Xuewu Huang,Wancheng Gu,Yiu Wing Mai,Jiefeng Gao
It is highly desirable but still remains challenging to develop high-performance hydrogels with satisfactory mechanical properties for tissue engineering. Here, anisotropic yet transparent hydrogels (AHs) are prepared for tendon repair via a facile “poor solvent evaporation assisted hot-stretching” strategy. AHs have great mechanical properties with tensile strength, toughness, and fracture energy as high as 33.14 ± 2.05 MPa, 44.1 ± 3.5 MJ m −3 , and 106.18 ± 7.2 kJ m −2 , respectively. Especially, AHs show unique flaw-insensitive characteristics, and cracks can only deflect along the fiber alignment direction rather than propagate transverse to this direction, showing an interesting self-protection function. The high strength, toughness, and fatigue resistance originate from the hierarchal structure of AHs, i.e., the densified polymeric network comprising fiber bundles and nanofibrils with aligned macromolecular chains, crystalline domains, and intermolecular hydrogen bonds. AHs with superior biocompatibility and swelling resistance can be used to repair rat tendons, and implantation of AHs can promote collagen regeneration for the tendon repair. This study provides a new method to fabricate strong and anti-fatigue hydrogels as a new class of promising materials for soft tissues.
研究领域:
生物材料学
·
组织工程学
·
再生医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Tengfei Li,Lihua Wang,Jian Li
All-organic batteries that employ organic compounds as the cathode- and anode-active materials have emerged as a promising rechargeable battery chemistry system due to their environmental friendliness, sustainability, flexibility and wide raw materials availability. Just like current lithium-ion batteries, if operated improperly, there are also safe concerns mainly caused by thermal runaway in all-organic batteries. However, the safety protection for all-organic batteries has not been explored by far. In this work, a novel type of temperature-responsive symmetric all-organic battery with overheating self-protection function is proposed based on poly(3-octylthiophene) (P3OT) as both cathode- and anode-active materials. P3OT is anchored on carbon nanotube (CNT) surface to boost its p- and n-type redox activity. Rewarded by this, the resulting all-organic battery delivers a reversible capacity of 97.2 mAh g −1 at 50 mA g −1 between 0.01 and 2 V and exhibits an outstanding cycling stability. More importantly, when being charged under overheating conditions, the designed all-organic battery can always maintain the low state-of-charge. It can provide an early warning of battery overheating, and mitigate the release of chemical energy if the battery finally goes to fire. During the discharge process, the all-organic battery will be rapidly switched off, thus avoiding continuous battery damage. The thermal protection is proved to be derived from the thermal dedoping of PF 6 - from cathode-active P3OT. In addition, the all-organic battery is able to resume its normal function when battery temperature is dropped to room temperature.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Yiqian Lv,Bo Wang,Jingmao Zhao,Haiqing Liu,Ziji Li,Fangze Zi,Yuhao Guo
To overcome the critical limitation of conventional epoxy coatings in providing long-term barrier effect against corrosion species and on-demand corrosion inhibition at damaged sites, this study develops a self-protective CeO 2 @ZrP/EP composites coating via in-situ hydrothermal growth of pH-responsive CeO 2 nanoparticles on lamellar α-ZrP nanosheets. The hydroxyl-rich CeO 2 nanoparticles not only enhance interfacial compatibility by filling voids and creating mechanical interlocking between α-ZrP nanosheets and the epoxy matrix, but also enable pH-triggered Ce 3+/4+ release under acidic condition. After 60 days immersion, the composite coating achieved a low-frequency impedance modulus (|Z| 0.01Hz ) of 3.5 × 10 9 Ω·cm 2 , which is four orders of magnitude higher than pure EP coating (3.7 × 10 5 Ω·cm 2 ). Crucially, elemental mapping confirmed 2.0 wt% cerium enrichment at artificial scratches, demonstrating autonomous active inhibition. This dual-action strategy synergistically integrates durable barrier protection with intelligent corrosion inhibition, providing long-term steel protection in marine environments.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Hao Zhang,Pan Xue,Jialiang Liu,Xinhua Xu
Currently, electrochemical energy storage devices are one of the main energy sources of portable flexible electronics. However, the continuous heat accumulation inside the energy storage device possesses the risk of inducing thermal runaway. Preventing thermal hazards and dynamically adjusting thermal behavior are of paramount importance to solve the safety issues caused by flexible energy storage devices, especially for various wearable consumer electronic products that are in close contact with the human skin. Here, we report a self-protective flexible supercapacitor (SP-FSC) with reversible thermal-switching behavior based on temperature-responsive poly(N-isopropylacrylamide-co-N-methylolacrylamide) (PNIPAM/NMAM) hydrogel polyelectrolytes. As the temperature increases, the specific capacitance is gradually reduced because the thermal association between the copolymer molecular chains of the electrolyte can suppress the migration of conductive ions and switch off the ion-transport channels, as well as hydrophilic–hydrophobic transition upon the surface of the hydrogel. Benefiting from thermal reversibility of the PNIPAM copolymer network, the capacity loss can be restored after cooling down and the self-protection function of the SP-FSC is repeatable even during five heating/cooling cycles, instead of the existing one-time strategy. Furthermore, the SP-FSC can exhibit different electrochemical performances with a wide temperature window (25–70 °C). Therefore, this work offers an appealing and nondisposable avenue to address thermal safety issues for flexible energy storage sources.
研究领域:
材料科学
·
能源存储
·
柔性电子
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Hanlin Shao,Zhihao Chen,Jingli Chang,Xiaoshuang Yin,Yun Chen,Ying Liu,Kegui Zhang,Wenzhong Yang
The inadequate water resistance and mechanical properties of waterborne anticorrosive coatings is a serious problem that leads to coating failure. When the bark of acacia trees sustains damage, the liquid Gum Arabic (GA) that oozes from the trunk coagulates at the site of injury to safeguard it, which is called “gummosis” self-protection. Inspired by this, biomimetic GA microgel–based waterborne anticorrosive coatings are designed. Microgel exhibits a crosslinked polymer network structure with a combination of advantageous characteristics derived from both solids and liquids. By encapsulating the liquid corrosion inhibitors (MeBT) within the solid microgel matrix, the coating system is endowed with self-protective capabilities. The as-prepared GAMG–MeBT microgels are introduced into waterborne epoxy (WE) matrix and sprayed onto the surface of Q235 steel. Corrosion studies reveal the 3.0-wt% GAMG–MeBT/WE coating exhibits an impedance modulus value in the low-frequency region ( Z 0.01 Hz ) of 1.37 × 10 9 Ω cm 2 after immersing in 3.5-wt% NaCl solution for 60 days, which is nearly two orders of magnitude higher than that of the pure WE coatings. Moreover, the coatings display improved water resistance, enhanced abrasive resistance, and active corrosion protection . This work provides a new approach to solving the failure of WE anticorrosive coatings.
研究领域:
材料科学
·
化学工程
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2023
·Vol. 13
·期 22
·2300143
·
IF 27.8
Zezhao Liu,Qian Yu,Nischal Oli,Jose Fernando Florez Gomez,Shen Qiu,Haoran Tian,Qian Qiu,Wei Sun,Kuihao Li,Zhishan Liu,Mingming Chen,Jinliang Yuan,Xianyong Wu,Lan Xia
The safety issue represents a long-standing obstacle that retards large-scale applications of high-energy lithium batteries. Among different causes, thermal runaway is the most prominent one. To date, various approaches have been proposed to inhibit thermal runaway; however, they suffer from some intrinsic drawbacks, either being irreversible (one-time protection), using volatile and flammable electrolytes, or delayed thermal protection (140–150 °C). Herein, this work exploits a non-volatile, non-flammable, and thermo-reversible polymer/ionic liquid gel electrolyte as a built-in safety switch, which provides highly precise and reversible thermal protection for lithium batteries. At high temperature, the gel electrolyte experiences phase separation and deposits polymer on the electrode surfaces/separators, which blocks Li + insertion reactions and thus prevents thermal runaway. When the temperature decreases, the gel electrolyte restores its original properties and battery performance resumes. Notably, the optimal protection effect is achieved at 110 °C, which is the critical temperature right before thermal runaway. More importantly, such a thermal-protection process can repeat multiple times without compromising the battery performance, indicating extraordinary thermal reversibility. To the authors' knowledge, such a precise and reversible protection effect has never been reported in any electrolyte systems, and this work opens an exciting avenue for safe operation of high-energy Li batteries.
研究领域:
材料科学
·
能源技术
·
电池安全
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Shaoshuai Ma,Yunhui Shi,Yan Zhang,Liting Zheng,Qian Zhang,Xinhua Xu
Thermal runaway has always been a significant safety issue that high-performance electronic devices urgently need to solve. These existing strategies are limited by the lack of reversibility and low conductivity. Here, we propose a novel thermoreversible self-protection microsupercapacitor (TS-MSC) based on a thermoresponsive polymer electrolyte to prevent thermal runaway. When heating above the low critical solution temperature (LCST), a gelation process occurs in the smart electrolyte and effectively inhibits the migration of ions, leading to a decreased specific capacitance and an increased internal resistance of the MSC. However, the electrolyte transforms to a solution state at room temperature in which ions can freely migrate. Benefiting by sol–gel transition of the smart electrolyte, the TS-MSCs can exhibit different electrochemical performances at elevated temperatures, demonstrating an active method of achieving thermoreversible and dynamic self-protection. In addition, 3D printing technology and substrate versatility provide an attractive method in the design of integrated micropower devices. Therefore, such functional TS-MSCs offer a promising strategy to solve the safety issues of the nowadays portable microelectronic devices.
研究领域:
材料科学
·
电子工程
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROANALYSIS
·
2020
·Vol. 32
·期 6
·1354-1363
·
IF 2.544
Pengcheng Zhao,Meijun Ni,Chao Chen,Chenxi Wang,Pingping Yang,Xiahui Wang,Chunyan Li,Yixi Xie,Junjie Fei
A novel self-protection sensor was successfully constructed based on an interesting thermo-sensitive triblock polymer PS-PNIPAm-PS. At low temperatures (<24 °C), the analyte was able to undergo the redox process at the modified electrode. However, the polymer shrunk and accumulated at high temperatures (>30 °C), which dramatically increased the electron transfer resistance (Rct) of the modified electrode and consequently blocked the occurrence of the redox reaction to protect the electrode from high temperatures and enhance its stability. Under optimized conditions, the proposed sensor showed a good detection range for hydroquinone (6×10 −7 to 2.35×10 −3 M) and a low LOD (490 nM). The sensor was also successfully applied for detecting hydroquinone in real samples. The present work may provide a novel method for electrode protection, high-temperature alarm, high-temperature protection of batteries and new sensors production.
研究领域:
分析化学
·
材料科学
·
电化学传感器
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Renquan Xing,Ying Sun,Xiangyi Hou,Jing Yan,Run Wang,Xupin Zhuang,Guang Yang
Flexible moist-electric generators (MEGs) capable of harvesting energy from atmospheric moisture have emerged as promising sustainable power sources for wearable electronics. However, their softness characteristic renders them vulnerable to mechanical damage (e.g., accidental impacts and punctures), consequently resulting in device failure. Here, inspired by the dynamic characteristics of sea cucumber skin, a self-protective, self-healing, and high power-output MEG was developed by integrating a stimuli-responsive supramolecular polyurethane (USPU). The USPU network was well engineered via transient quadruple hydrogen bonds and highly dynamic disulfide bonds, thereby achieving exceptional flexibility, impact-hardening and self-healing properties. Upon integration of USPU as a moisture barrier, the resulting MEG exhibited high power outputs (i.e., 1.05 V in voltage and 23.3 μA cm −2 in current density), while the USPU could protect the inner functional components from damage under severe mechanical stimuli. Moreover, the MEG also had good self-healing property, exhibiting complete recovery in resistance and voltage output after healing. In light of these unique properties, the application of MEG has been demonstrated as wearable power source, which generates stable electric output even under extreme collision and puncture events. This work provides a versatile strategy for developing mechanical robust and high-performance energy supply systems for wearable electronics.
研究领域:
材料科学
·
能量收集
·
柔性电子
·
自愈材料
·
生物启发工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Qiwei Zhang,Zhenlu Zhao
Transition metal disulfide compounds (TMDs) catalysts exhibit excellent catalytic ability in hydrogen evolution reaction (HER), but they are susceptible to OH- poisoning under strong alkali conditions leading to active site inactivation, thus affecting their catalytic activity and stability. In this regard, we propose a catalyst “self-protection” strategy against OH - attack. Specifically, we synthesized a composite heterojunction MnMoO 4 @CoS 2 /MoS 2 on carbon cloth (CC) by a hydrothermal and calcination process. The experimental results show that MnMoO 4 undergoes reconfiguration during the HER process, and its MoO 4 2- takes the lead in dissolving in the electrolyte before being re-adsorbed on the surface of the electrocatalyst to form a protective layer, which greatly inhibits the erosion of OH - on the catalyst and effectively prevents the oxidation of the Mo 4+ and the edge S sites, which is beneficial to the long-term stability of the catalyst. The CoS 2 /MoS 2 heterojunction provides more active sites and higher conductivity to enhance its catalytic activity. The products exhibit overpotentials of only 71 and 171 mV at current densities of 10 and 100 mA cm −2 , and have long-term stability of over 100 h. In comparison, the samples after base hydrolysis treatment (deprotection) showed a significant performance decay. This study provides a novel approach for the rational design of efficient and stable TMDs catalysts.
研究领域:
催化
·
材料科学
·
电化学
·
纳米技术
·
能量转换
·
表面科学
✓ 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）