ADVANCED FUNCTIONAL MATERIALS
·
2018
·
IF 13.325
Peng Li,Gong Jinghua,Ma Jinghong
Electro-responsive hydrogels have attracted great attentions because the electric stimuli is easy to be applied and controlled. Thus, it is expected to generate electro-responsive hydrogel fiber to improve electro-response rate. In this paper, graphene oxide/hydrolyzed polyacrylamide/sodium alginate (GO/HPAM/SA) hydrogel fibers were prepared by microfluidic spinning. The structure and morphologies of hydrogel fibers were characterized by FTIR and SEM. The electro-response behaviours were also studied. The results indicate that GO/HPAM/SA hydrogel fibers exhibit bending deformation in an electric field. In Na 2 SO 4 solution, the hydrogel fibers first bend toward the cathode, and then bend toward the anode. It is suggested the bending of the hydrogel fibers is caused by two major factors, one is the osmotic pressure difference, another is the pH gradient induced by electrochemical reactions. Keywords Electro-responsive hydrogel fiber Bending behaviour Osmotic pressure difference pH gradient
研究领域:
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
Carbon Energy
·
2024
·Vol. 6
·期 9
·e535
·
IF 19.5
Zhimin Niu,Yan Gao,Tianhui Wu,Fei Zhang,Ran Zhao,Zijia Chen,Yiming Yuan,Tifeng Jiao,Jianmin Gu,Li Lu,Desong Wang
Rechargeable neutral aqueous zinc−air batteries (ZABs) are a promising type of energy storage device with longer operating life and less corrosiveness compared with conventional alkaline ZABs. However, the neutral ZABs normally possess poor oxygen evolution reactions (OERs) and oxygen reduction reactions performance, resulting in a large charge–discharge voltage gap and low round-trip efficiency. Herein, we demonstrate a sunlight-assisted strategy for achieving an ultralow voltage gap of 0.05 V in neutral ZABs by using the FeOOH-decorated BiVO 4 (Fe-BiVO 4 ) as an oxygen catalyst. Under sunlight, the electrons move from the valence band (VB) of Fe-BiVO 4 to the conduction band producing holes in VB to promote the OER process and hence reduce the overpotential. Meanwhile, the photopotential generated by the Fe-BiVO 4 compensates a part of the charging potential of neutral ZABs. Accordingly, the energy loss of the battery could be compensated via solar energy, leading to a record-low gap of 0.05 V between the charge and discharge voltage with a high round-trip efficiency of 94%. This work offers a simple but efficient pathway for solar-energy utilization in storage devices, further guiding the design of high energy efficiency of neutral aqueous ZABs.
研究领域:
材料科学
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能源存储技术
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Petroleum Research
·
2025
·
IF 4
Chengxi Deng,Min Chen,Changsong Liu,Yinfeng Xu,Yonghui Du,Hua Dong
Rock surface wettability plays a crucial role in gas flooding for oil recovery. Natural rock surfaces are usually oleophilic, resulting in high flooding resistance and low recovery in gas flooding. This study explores the regulation of the wettability of sandstone rock surfaces by modifying them with 1H,1H,2H,2H-perfluorodecyltrimethoxysilane or its mixtures with hexyltrimethoxysilane to achieve oil contact angles ranging from 0° to 93.2°. Simulated gas flooding experiments, with N 2 as model gas, reveal that reducing the oleophilicity of rock surfaces improves gas flooding efficiency. Compared to the unmodified superoleophilic rocks, the final oil recoveries in the cores with neutral oil wettability significantly increases and the pressure differential for gas flooding significantly decreases. In cases of cores with permeability of 22 mD, 0.88 mD and 0.09 mD, the increases in oil recovery are from 28.5% to 37.5%, from 20.2 to 27.3% and from 9.1% to 15.4%, respectively; and the reductions of pressure differential for gas flooding are from 53 kPa to 41 kPa, from 323 kPa to 272 kPa, from 1054 kPa to 935 kPa, respectively. These results highlight the critical influence of wettability regulation on gas flooding efficiency, offering valuable insights for optimizing oil recovery strategies.
研究领域:
石油工程
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油藏模拟
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表面化学
·
提高采收率
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD PROCESSING AND PRESERVATION
·
2020
·Vol. 45
·期 2
·e15162
·
IF 1.405
Xuanyu Wang,Yinan Gao,Yating Zhao,Xihong Li,Jiangming Fan,Luyin Wang
This study investigated the effects of different drying methods, including hot-air drying (HD), freeze drying (FD), and pressure-differential puffing drying (PPD), on the quality and microstructure of fresh jujube crisp slices. Our data confirmed that PPD has the best effect, followed by FD and HD. Crisps dried using FD had good color and the best rehydration rate, shrinkage volume rate, and apparent density. The color, rehydration, and hardness of fragile chips by PPD and FD were similar; jujube slice volume shrinkage and density increase were due to water evaporation during drying. The bioavailability and microstructure of PPD was the best. Polysaccharide and total phenol bioavailability was the highest in PPD samples and remained stable, with clear porous structure and a smaller folding structure, indicating that PPD maintains the porous cell structure. Thus, PPD provides high quality fresh jujube crisp slice products due to uniform honeycomb network and less collapsed structure. Practical applications Jujube is a fruit grown in China. This study provides technical information and theoretical basis for the production of puffed dry food, which is widely used in food production. First, the crisps obtained can be directly graded, packaged, sold, and transformed into green snack food; these techniques can be applied to other fruits, such as cantaloupe, apricot, and carrot. Second, dried fruits and vegetables were directly processed into ultra-micro nutrient powder, which retains its flavor to a large extent. Furthermore, the dried powder may be used as auxiliary materials or seasoning in the processing of other foods to improve the color and flavor of the product. Processing fresh jujube into crisps can widen its industrial applications and add value to its products.
研究领域:
食品科学
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农业工程
·
营养学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Yuan He,Zhan Chen,Xia Huang,Xiaomao Wang,Xianghua Wen
The integration of membrane filtration and catalytic ozonation is increasingly investigated in micro-polluted wastewater treatment , whereas membrane fouling still inhibits its practical application. In the present study, a novel MnCe-catalytic membrane integrated with ozone process (O 3 /MnCe-CM) was established and applied to remove four micropollutants from the real secondary effluent in continuous operation. Efficient removal of four representative micropollutants with the removal rate ranging from 89.33 % to 99.49 % and superior performance on conventional pollutants, with the DOC, UV 254, polysaccharide , and protein reduced by 30 %, 88 %, 32.5 %, and 24 %. The O 3 /MnCe-CM process had an improved TMP control effect, explicitly reducing the irreversible fouling resistance given a R ir /R t of 10.17 % which is 42.9 % of that of the O 3 /CM process. After filtering for 70 days, the TMP only increased by 24.51 kPa. More importantly, the antifouling mechanism was proposed as the combined effects of the decrease of the membrane isoelectric point that elevated its repulsion towards pollutants and the catalytic ozonation that reduced the organic foulants accumulated on the membrane surface and inside the pores. In addition, ozonation in the membrane tank decreased the pollutant load passing through MnCe-CM. In all, the present study provides a novel O 3 /MnCe-CM process with a promising application perspective.
研究领域:
环境工程
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水处理
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催化
·
膜科学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Hongyu Gong,Xiangjun Zheng,Kai Zeng,Bo Yang,Xiu Liang,Le Li,Yuanyuan Tao,Ruizhi Yang
Developing non-noble oxygen electrocatalyst is of great importance in multiple energy conversion and storage technologies, for instance, metal-air battery , fuel cell and water electrolysis . Here, we report a bifunctional oxygen electrocatalyst derived from Ni–Fe dual-metal zeolitic imidazole frameworks, Ni 3 Fe nanoalloys embedded in N-doped carbon (Ni 3 Fe/N–C) containing carbon nanotube and porous carbon , which exhibits superior oxygen reduction and evolution reaction electrocatalytic performance. For oxygen reduction reaction , the onset potential and the half-wave potential of Ni 3 Fe/N–C are 0.92 V and 0.85 V, respectively, which are well consistent with those of commercial Pt/C. For oxygen evolution reaction , a low overpotential of 330 mV at 10 mA cm −2 is obtained for Ni 3 Fe/N–C, prominently better than that of commercial RuO 2 /C. Moreover, the oxygen reduction and evolution stability of Ni 3 Fe/N–C distinctly overmatches that of commercial Pt/C and RuO 2 /C. Benefiting from the favorable electrocatalytic activity and stability, the rechargeable Zn–air battery based on Ni 3 Fe/N–C exhibits smaller voltage gap (∼0.8 V) than the one based on commercial Pt/C and RuO 2 /C, and remarkable stability during 300-cycle discharge-charge test. The excellent performance can be attributed to the interaction between Ni 3 Fe nanoalloy and N-doped carbon, the unique nanostructure composed of carbon nanotube and porous carbons, and high graphitization degree.
研究领域:
材料科学
·
电化学
·
能源存储与转换
·
纳米技术
✓ 已验证
DOI
高影响因子
Science Bulletin
·
2018
·
IF 4.136
Zhen-Dong Yang,Zhi-Wen Chang,Qi Zhang,Keke Huang,Xin-Bo Zhang
A facile synthesis of the hierarchically porous cathode with Mo 2 C nanoparticles through the electrospinning technique and heat treatment is proposed. The carbonization temperature of the precursors is the key factor for the formation of Mo 2 C nanoparticles on the carbon nanofibers (MCNFs). Compared with the Mo 2 N nanoparticles embedded into N-doped carbon nanofibers film (MNNFs) and N-doped carbon nanofibers film (NFs), the battery with MCNFs cathode is capable of operation with a high-capacity (10,509 mAh g −1 at 100 mA g −1 ), a much reduced discharge-charge voltage gap , and a long-term life (124 cycles at 200 mA g −1 with a specific capacity limit of 500 mAh g −1 ). These excellent performances are derived from the synergy of the following advantageous factors: (1) the hierarchically self-standing and binder-free structure of MCNFs could ensure the high diffusion flux of Li + and O 2 as well as avoid clogging of the discharge product, bulk Li 2 O 2 ; (2) the well dispersed Mo 2 C nanoparticles not only afford rich active sites, but also facilitate the electronic transfer for catalysis.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Haoqing Lin,Jiao Xie,Zhenbao Zhang,Shaofeng Wang,Dengjie Chen
We applied a novel solid-liquid co-electrospinning approach to synthesize hybrid LaCoO 3 perovskite nanoparticles@nitrogen-doped carbon nanofibers (LCNP@NCNF) as an effective and robust electrocatalyst for Zn-air batteries. LCNP@NCNF featured an integrated structure with well-crystallized perovskite nanoparticles uniformly distributed in micro/mesoporous NCNF. In addition, LCNP@NCNF exhibited a high specific surface area of ~183.3 m 2 g −1 and a large pore volume of ~0.164 m 3 g −1 . The rotating-electrode measurement revealed the better intrinsic activity and more favorable stability of LCNP@NCNF in comparison with their counterparts. Moreover, Zn-air batteries employing LCNP@NCNF showed a relatively smaller discharge-charge voltage gap of ~0.95 V and longer cycling stability than the battery adopting the physically blended LCNP and NCNF. We ascribed the improved electrochemical activity to the enhanced synergistic interaction originating from the successful coupling of LCNP and NCNF.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Haoqing Lin,Peng liu,Shaofeng Wang,Zhenbao Zhang,Ziyang Dai,Shaozao Tan,Dengjie Chen
Perovskite LaMnO 3 is reported to be a superior electrocatalyst for oxygen reduction reaction in terms of the onset potential and intrinsic activity. However, traditionally prepared LaMnO 3 is characterized to exhibit a low specific surface area and a limited pore volume . Herein, we synthesize a three-dimensional ordered macroporous LaMnO 3 that features ordered and interconnected porous structure , in order to increase catalytic sites. The obtained three-dimensional ordered macroporous LaMnO 3 exhibits an increased specific surface area of 20.328 m 2 g −1 and pore volume of 0.126 cm 3 g −1 . Rotating-ring-disk electrode measurement reveals a more positive onset potential (0.827 V) and half-wave potential (0.686 V), and a much higher current-limited density (5.90 mA cm −2 ) of the three-dimensional ordered macroporous LaMnO 3 compared to counterparts, as well as a high electron transfer number (∼4) and a better stability. Furthermore, a Li O 2 battery employing the three-dimensional ordered macroporous LaMnO 3 as air electrode exhibits excellent electrochemical performance with a higher initial discharge capacity (5592 mAh g −1 ), a smaller discharge-charge voltage gap (1.56 V), and a higher coulombic efficiency (∼100%) in comparison with the carbon electrode. Our results suggest that traditional perovskite oxides could be effectively optimized for efficient electrocatalytic reactions .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS ES&T Water
·
2024
·
IF 4.8
Jianguo Li,Shikan Zheng,Wanli Yan,Chengsong Ye,Xin Yu
The membrane-aerated biofilm reactor (MABR) is emerging as a promising solution for future wastewater treatment owing to its remarkable proficiency in achieving concurrent nitrogen and carbon removal. The research addressed a new type of MABR (R2) equipped with a polytetrafluoroethylene membrane-wrapped hollow nylon rope module that was constructed to improve the carbon and nitrogen removal of conventional MABR (R1). Uninterrupted operation lasting 120 days was conducted to compare the performance of R1 and R2 in treating simulated municipal wastewater with varying chemical oxygen demand (COD)/nitrogen (C/N) ratios. The results showed that R2 outperformed R1, exhibiting over 15.9% and 27.9% higher COD and TIN removal rates, respectively. The nylon fillers promoted biofilm formation, mitigated membrane pore clogging by the extracellular polymeric substances, and maintained a stable transmembrane pressure. R2 consistently maintained stable ammonia removal efficiency across different C/N ratios, while R1 exhibited a notable decrease at a high influent C/N ratio. Utilizing nylon carriers on membranes offered a cost-efficient and convenient method for modifying and preparing membranes for treating wastewater with broader C/N ratios and scaling up MABR applications.
研究领域:
环境工程
·
废水处理
·
生物技术
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）