Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 31
·15348-15358
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IF 9.931
Ziqiu Ren,Jinde Wu,Na Wang,Xin Li
Current perovskite solar cells (PSCs) often use high-purity single-crystal metal oxides prepared by complex growth processes as electron transport layers (ETLs). In particular, TiO2, as an ETL, can deteriorate the stability of PSCs under illumination. Here, we report a passivation strategy using Er-doped TiO2 synthesized with a one-step hydrothermal method as an ETL. Notably, the oxygen-induced defects in TiO2 have decreased to an acceptable level for PSCs due to the introduction of Er3+ ions. More interestingly, we find that a phase junction can be formed in the mixed crystalline rutile/anatase phase of TiO2, and this TiO2 phase junction can achieve efficient charge separation and accelerate internal electron transfer of the ETL. Taking advantage of these facts, we obtain TiO2-based PSCs through a two-step sequential deposition method in ambient air, whose best efficiency increases by 45.8%. Moreover, the Er-doped device exhibits remarkable ultraviolet resistance ability, whose efficiency is maintained over 90% even after 500 hour ultraviolet irradiation. We believe that this demonstrated strategy provides an effective way for preparing efficient and ultraviolet resistant PSCs in air.
研究领域:
材料科学
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能源技术
·
光伏器件
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JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
·
2019
·Vol. 46
·期 6
·783-790
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IF 2.993
Li Zhongkang,Xiong Bin,Liu Li,Li Siwei,Xin Xiuqing,Li Zhi,Zhang Xueli,Bi ChangHao
Massive emission of CO2 into atmosphere from consumption of carbon deposit is causing climate change. Researchers have applied metabolic engineering and synthetic biology techniques for improving CO2 fixation efficiency in many species. One solution might be the utilization of autotrophic bacteria, which have great potential to be engineered into microbial cell factories for CO2 fixation and the production of chemicals, independent of fossil resources. In this work, several pathways of Ralstonia eutropha H16 were modulated by manipulation of heterologous and endogenous genes related to fatty acid synthesis. The resulting strain B2(pCT, pFP) was able to produce 124.48 mg/g (cell dry weight) free fatty acids with fructose as carbon source, a fourfold increase over the parent strain H16. To develop a truly autotrophic fermentation technique with H2, CO2 and O2 as substrates, we assembled a relatively safe, continuous, lab-scale gas fermentation system using micro-fermentation tanks, H2 supplied by a hydrogen generator, and keeping the H2 to O2 ratio at 7:1. The system was equipped with a H2 gas alarm, rid of heat sources and placed into a fume hood to further improve the safety. With this system, the best strain B2(pCT, pFP) produced 60.64 mg free fatty acids per g biomass within 48 h, growing in minimal medium supplemented with 9 × 103 mL/L/h hydrogen gas. Thus, an autotrophic fermentation technique to produce fatty acids was successfully established, which might inspire further research on autotrophic gas fermentation with a safe, lab-scale setup, and provides an alternative solution for environmental and energy problems.
研究领域:
微生物学
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生物技术
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环境工程
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合成生物学
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高影响因子
Journal of Coatings Technology and Research
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2023
·
IF 2.3
Zhao Chengshou,Jiang Yisong,Fu Wang,Liu Zhuangyuan,Liu Siyuan,Peng Huaqiao,Esmaeili Nima
A novel epoxy-based self-intumescent fire protective coating has been developed by formulating a combination of ammonium polyphosphate (APP) and copper (I) oxide (Cu 2 O) in epoxy resin (EP). The effects of various combinations on fire protective performance for steel plate were evaluated using a lab-scale simulated big panel test. Formulations with different mass ratios of APP to Cu 2 O ranging from 10:0 to 2:8 exhibit good fire protective performance for steel plate. While the final equilibrium backside temperature of un-protected steel plate reached 529 °C, it did not exceed 282 °C for the protected plates with 2 mm thick coatings, which is much lower than the failure temperature of steel (ca. 500 °C). The lowest final equilibrium backside temperature of coated steel plate was 234.5 °C for the optimal formulation (EP/24APP/16Cu 2 O) with an APP/Cu 2 O mass ratio of 6/4 in EP. Interestingly, the limiting oxygen index (LOI) value (46.8%) for the optimized formulation (EP/24APP/16Cu 2 O) is not the highest, being lower than those of (EP/40APP/0Cu 2 O) and (EP/32APP/8Cu 2 O) formulations. The fire behavior of the optimized formulation (EP/24APP/16Cu 2 O) and control EP was compared using the cone calorimetry. The main fire hazard parameters such as peak heat release rate, total smoke production and peak CO production for EP/24APP/16Cu 2 O are reduced by 80.0%, 59.5% and 75.0%, respectively, relative to those for EP. This indicates that the EP/24APP/16Cu 2 O formulation provides significantly better fire safety than does control EP alone. A possible mode of action for the combination of APP/Cu 2 O in terms of the expansion ratio and heat insulation degree of the formed intumescent char layer may be proposed. Thus, this work contributed a reference for developing intumescent fire protective coating with high fire safety.
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ANALYST
·
2023
·Vol. 148
·期 10
·2214-2224
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IF 4.2
Jiandan Chen,Hongying Liu,Chenwei Wang,Kai Fan,Lihua Li,Yuqing Zhang,Lu Fang,Zheng-Zhi Yin,Zhong Lü
Chlorpromazine (CPZ) is a medicine for nervous system disorders. Measuring CPZ in vivo can assist doctors in evaluating patients’ blood drug concentration and monitoring drug metabolism. Therefore, an accurate in vivo detection of CPZ is crucial. In recent years, the acupuncture needle, traditionally used in Chinese medicine, has emerged as a potential electrode in the field of electrochemistry, with promising applications for in vivo detection. In this study, Au/Cu nanoparticles were electrodeposited onto an acupuncture needle electrode (ANE) to improve electrical conductivity and provide an electro-catalytic surface. Subsequently, 3-aminophenylboronic acid and CPZ were attracted to each other through intermolecular forces; at the same time, the interaction force of Au–S between CPZ and the AuNPs made the polymer layer grow around the CPZ molecules on the modified electrode surface. The imprinted nanocavities showed highly selective and sensitive detection performance for CPZ after elution. Inside the recognizable site and microenvironment of the cavities, the captured CPZ molecule provided a suitable configuration for the fluent electron transfer of the electroactive group within a short range from the Au/Cu bimetal. Under ideal conditions, the MIP/Au/Cu/ANE exhibited two good linear ranges of 0.1–100 μM and 100–1000 μM with a detection limit of 0.07 μM. Moreover, the sensors showed great selectivity, good stability and excellent repeatability, making them suitable for CPZ detection in human serum. This provides a novel idea for real-time and in vivo CPZ detection.
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高影响因子
Nanoscale
·
2023
·Vol. 15
·期 20
·9049-9059
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IF 6.7
Xiaolong Deng,Shanshan Wang,Yi Liu,Jiafeng Cao,Jinzhao Huang,Xingwei Shi
In this study, a hierarchical interconnected porous metal sulfide heterostructure was synthesized from CoFeAl layered double hydroxides (LDHs) by a two-step hydrothermal process (sulfidation and a NaOH etching process). Among the as-made samples, the CoFeAl-T-NaOH electrode exhibited excellent oxygen and hydrogen evolution reaction catalytic activities with overpotentials of 344 mV and 197 mV at the current density of 100 mA cm−2, respectively. Meanwhile, small Tafel slopes of 57.7 mV dec−1 and 106.5 mV dec−1 for water oxidation and hydrogen evolution were observed for the CoFeAl-T-NaOH, respectively. Serving as both the cathode and anode for overall water splitting, the CoFeAl-T-NaOH electrode reached a current density of 10 mA cm−2 at a cell voltage of 1.65 V with excellent stability. The enhanced electrocatalytic activity could be attributed to: the hierarchical interconnected nanosheet structure facilitating mass transport; the porous structure promoting electrolyte infiltration and reactant transfer; the heterojunction accelerating charge transfer; and the synergistic effect between them. This study offered a new clue for in situ synthesizing porous transition-metal based heterojunction electrocatalysts with a careful tuning of the sequence of sulfuration and alkaline etching to enhance the electrocatalytic performance.
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Journal of Materials Chemistry B
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2023
·Vol. 11
·期 23
·5123-5130
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IF 7
Hong Wang,Mengmeng Gu,Menghua Yan,Xiuming Wu,Yuming Dong,Guang-Li Wang
Cathodic photoelectrochemistry, a research hotspot in state-of-art bioassays, is generally circumscribed by its monotonous signal transduction tactic of photoinduced electron transfer (PET) mechanism, which significantly narrows the scope of its applications. In this study, we reveal the surface oxygen vacancy (VO) formation elicited by the spontaneous coordination of catechol (CA) onto the surface of BiOI nanoplates for the innovative operation of the cathodic PEC signal transduction tactic. The in situ-generated VO functions as a carrier separation center to efficiently promote photocurrent generation. Taking tyrosinase (TYR) and Escherichia coli O157:H7 (E. coli O157:H7) as model targets, the established signal transduction tactic was validated as efficient and sensitive for the detection of the two targets with linear ranges from 1.0 × 10−4 to 1.0 U mL−1 and 5.0 to 1.0 × 106 CFU mL−1, respectively. Low-detection limits of 1.0 × 10−4 U mL−1 and 3.0 CFU mL−1 were achieved for TYR and E. coli O157:H7, respectively. This study opens up a new perspective of in situ generated surface VO on semiconductors, which underlies an innovative PEC signal transduction mechanism with convincing analytical performance. Hopefully, it might encourage more explorations of new methodologies for introducing surface vacancies with exquisite applications.
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高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Lihong Luo,Cuiwen Jiang,Hu Li,Dejiao Ning,Shuibing Lao,Zhongdan Liang,Li Tang,Weiwei Chen,Yu Ya
In this study, a novel electrochemical aptasensor for carbofuran (CBF) detection is prepared by gold nanoparticles decorated hierarchical porous carbon (Au@HPC). The prepared carbon materials show a three-dimensional hierarchical structure with a large specific surface area and a highly developed porous structure. Aptamers loading significantly improves when gold nanoparticles are embedded into the hierarchical porous carbon skeleton. Besides, Au@HPC modified electrode exhibits a large electroactive area and excellent electrochemical conductivity, serving as a promising platform for highly sensitive and selective electrochemical detection of CBF. The developed CBF electrochemical aptasensor shows a wide linear from 1.0 to 100000 pg/L with a detection limit of 0.5 pg/L, demonstrating an extraordinary sensitivity compared to other sensors for CBF detection. Additionally, the designed aptasensor was used to monitor the CBF in vegetable samples, with a recovery range from 98.4% to 104.8%. The results coincide with the standard test method, revealing its practicability in the food safety analysis.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Quan Li,Huan Liu,Benqiao He,Wenxiong Shi,Yanhong Ji,Zhenyu Cui,Feng Yan,Younas Mohammad,Jianxin Li
Efficient separation of Mg 2+ and Li + remains a major challenge in the extraction of lithium from salt lake brine. In this work, an electro-nanofiltration (NF) process was employed to separate Mg 2+ and Li + from the MgCl 2 /LiCl feed solution under a current density of 0–2.83 mA cm −2 and at an operating pressure of 5 bar. The surface chargeability of the NF membrane under an electric field (EF) was investigated in detail by combination of the experiment and theoretical simulation. It was found that Mg 2+ ions were almost completely rejected (no Mg 2+ detected by an ICP-OES with a determination limit of 0.01 ppm). A high permeance of Li + (0.55 molm −2 h −1 ) and a stable solution flux of 75 ± 2 Lm −2 h −1 were achieved. The separation performance was far better than the results reported in the literature until now. It was believed that high positive charges on the negative-charged NF membrane surface were in-situ reconstructed and enhanced with the increase in current density due to the complexion and enrichment of Mg 2+ on the membrane surface, leading to the high rejection for Mg 2+ . The dehydration of Li + ions with a low hydration energy under EF promoted the permeance of Li + . This work provides a practical route for efficient separation of Mg 2+ /Li + , and would have a huge potential in the extraction of high-pure Li + salt from salt lakes.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Weiting Yu,He Jiang,Jinhui Fang,Shuang Song
Reducing the Pd loading on electrodes is critical in the electrocatalytic hydrodechlorination (EHDC) of chlorinated organic compounds (COCs). The EHDC reaction of COCs on Pd involves three steps: H* formation, H* adsorption, and dechlorination. It has been established that the initial hydrogen evolution reaction (HER) occurs on Pd0 and the dechlorination steps occur on Pd2+. A strategy is proposed to design new electrodes by adding a reducible HER-active interlayer to replace Pd0, fulfilling the responsibility of producing hydrogen, and to facilitate the formation of more Pd2+ for following C–Cl bond cleavage. Keeping the atomic hydrogen adsorption energy on the Pd/interlayer similar to that on pure Pd is also necessary for H* adsorption as well as to maintain a high EHDC activity. For the first time, the NiCo2O4-interlayer-modified Pd/Ni-foam electrode was applied in the EHDC of COCs, which enhanced the EHDC efficiency to 100% within 90 min and reduced 88.6% of Pd consumption. The Pd/NiCo2O4/Ni-foam electrode with enhanced EHDC activity was also observed with almost 100% product selectivity and good stability. A synergistic mechanism is proposed for the enhanced EHDC activity on the Pd/NiCo2O4/Ni-foam. This work offers a simple and useful strategy to design robust electrocatalysts for the EHDC of COCs.
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高影响因子
Nanoscale
·
2020
·Vol. 12
·期 45
·23225-23233
·
IF 6.895
Jun-Peng Wu,Wen Liang,Wei-Zhi Song,Li-Na Zhou,Xiao-Xiong Wang,Seeram Ramakrishna,Yun-Ze Long
With the development of technology, environmental problems have become more and more acute and the use of electronic devices in harsh environments has gradually attracted attention. For example, the friction layer of triboelectric nanogenerators (TENGs) may be contaminated and corroded in harsh environments (such as acidic, alkaline or oily environments), resulting in damage or destruction of the TENGs. In this study, we use electrospinning followed by a sintering process to prepare a super-hydrophobic sintered polyvinyl alcohol–polytetrafluoroethylene (S-PVA–PTFE) composite membrane and general industrial oil-absorbing paper to construct a TENG. The maximum power density of the TENG is 261 mW m−2, it can light up 100 blue LEDs, and can power a variety of small electronic devices. Moreover, after 72 h of soaking the friction layer in a strong acid solution followed by a strong alkali solution, the performance of the TENG has no obvious change. The TENG can work stably in an oily working environment. The TENG provides a novel approach for self-powered sensors that work in harsh environments.
研究领域:
材料科学
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能源技术
·
环境科学
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Yaxuan Xiao,Xiong Zhao,Li Ma,Yichen Wang,Guoxin Mao,Jinhua Zhang,Bin Fang,Nanjing Hao
Bioinspired by the transformations of animals and plants such as pangolins and mimosas, many biomimetic shape-morphing systems have been developed. However, due to scale effect, microscale interactions become the dominant force, which may make the traditional shape-morphing systems ineffective. Acoustic actuation is expected to overcome this challenge. Here, we have developed an acoustically actuated hydrogel shape-morphing micromachine (AHSMM). It has a variable stiffness design, with the lower stiffness part serving as a flexible hinge to achieve transformation. Under the excitation of acoustic field, the flexible hinge produces strong oscillation and quickly provides the force and torque required for the transformation of AHSMM (generally less than 500 ms). In addition, we have developed a preprogrammed design for the transformation of micromachine to predict its transformation morphology. Furthermore, through the AHSMM, we have separately designed morphing transformations between Chinese characters (e.g., “夫” (fu) to “央” (yang)) and English letters (e.g., “k” to “x”). Finally, we developed a shape-morphing microrobot (width: 174.33 μm) utilizing this flexible hinge, which can pass through a narrow channel through its own shape-morphing, providing great potential in targeted drug delivery (the shape-morphing time is less than 100 ms, the forward speed can reach about 800 μm/s). Our work not only provides innovative ideas for shape-morphing design at the microscale, but also expands the coupling applications of acoustics, soft matter, and microrobots.
研究领域:
生物医学工程
·
微型机器人技术
·
柔性机器人
·
声学
·
仿生学
·
水凝胶技术
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 37
·2101024
·
IF 18.808
Zhengxin Zhu,Yahan Meng,Yi Cui,Wei Chen
Rechargeable hydrogen gas batteries are highly desirable for large-scale energy storage because of their long life cycle, high round trip efficiency, fast reaction kinetics, and hydrogen gas profusion. Coupling advanced cathode chemistries with hydrogen gas anode is an emerging and exciting area of research. Here, a novel high-performance aqueous iodine-hydrogen gas (I 2 -H 2 ) battery using iodine as cathode and hydrogen gas as the electrocatalytic anode in environmentally benign aqueous electrolytes is reported. The working chemistry of the battery involves I 2 /I − solid-liquid reactions occurring over the cathode along with H 2 /H 2 O gas-liquid reactions at the anode, achieving a high rate performance of 100 C and long-lasting stability of over 60 000 cycles. Additionally, the static aqueous I 2 -H 2 battery displays a volumetric capacity of 15.5 Ah L −1 along with good self-healing capability towards cell overcharge. The current battery design exhibits robust electrochemical performance irrespective of acidic, neutral, and alkaline electrolyte systems. This study paves the way towards the industrialization of economically effective, high-power density, and long-term I 2 -H 2 batteries for large-scale energy storage applications.
研究领域:
能源科学
·
材料科学
·
电化学
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高影响因子
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