JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Dan Yu,Yushuang Ma,Mingfeng Chen,Xiaoping Dong
Biomass precursors with natural porous structure and multifarious heteroatoms are desirably sustainable precursors for synthesis of carbon materials for energy and environmental applications. Herein, we reported wax gourd based porous carbons (WGPCs) with developed micro/mesoporous structures via potassium hydroxide (KOH) chemical activation . The optimized material that is denoted as WGPC-4 exhibits high specific surface area (2919 m 2 g −1 ) with oxygen and nitrogen contents of 17.9 at.% and 1.0 at.%, respectively. In a three-electrode system, the WGPC-4 electrode presents high specific capacitance of 333 F g −1 at current density of 1 A g −1 . Meanwhile, the assembled symmetrical cell using aqueous electrolyte (0.5 M Na 2 SO 4 ) has high specific capacitance (167 F g −1 at 1 A g −1 ), stable cycling characteristics (93% capacitance retaining after 5000 runs) and excellent energy density of 19.2 Wh kg −1 . Furthermore, these WGPC-4 electrodes were assembled into an all-solid-state supercapacitor using KOH/polyvinyl alcohol (PVA) gel as solid electrolyte , whose specific capacitance is 258 F g −1 at 1 A g −1 , retention at the 2500th run is 87% and energy density is 13.0 Wh kg −1 under a high power density. These materials with excellent structural characteristics are an ideal candidate for high-performance supercapacitors .
研究领域:
材料科学
·
能源与环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 15
·21476-21486
·
IF 5.164
Yuanlu Xu,Haichao Mu,Xiaoshi Han,Tianjun Sun,Xinfei Fan,Bowen Lv,Zonglin Pan,Yongxin Song,Chengwen Song
Summary Solar interfacial water evaporation is considered as a potential green technology to solve the global shortage of freshwater resources. However, it is still an arduous task to develop a low-cost and efficient solar evaporator with a simple preparation method. Herein, a simple, flexible, and porous polypyrrole-wax gourd (PPy-wax gourd) biomass evaporator was reported for solar evaporation enhancement. Wax gourd had the advantages such as superhydrophilic wettability, massive microporous channels, and easy planting. PPy was a kind of black polymer with excellent light absorption ability, which greatly improved the light absorption of the PPy-wax gourd evaporator within a full spectrum of solar irradiance (300-2500 nm). The PPy-wax gourd evaporator prepared by the perfect combination of wax gourd and polypyrrole realized a superior vapor generation ability (1.57 kg m −2 hours −1 ) with a photothermal conversion efficiency of 77.3% under 1 solar intensity, which was better than some other biomass evaporators developed so far. In addition, the PPy-wax gourd evaporator also exhibited remarkable stability and durability under long-term recycling utilization and harsh environments. Importantly, the PPy-wax gourd evaporator demonstrated prominent wastewater purification capacity and desalination performance for dye wastewater and simulated seawater treatment. Based on these results, this work would offer a new strategy for developing novel biomass thermal evaporators the clean water production.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 7
·8949-8961
·
IF 4.672
Xinfei Fan,Haichao Mu,Yuanlu Xu,Chengwen Song,Yanming Liu
Summary Solar-driven interfacial evaporation is an emerging environmentally-friendly technology to produce freshwater, but the current interface evaporators are restricted by their high cost, complex fabrication processes, and low resistance to environmental conditions. Here, a low-cost and high-efficient evaporator was prepared simply by modifying natural wax gourd with polydopamine (PDA) and silver nanoparticles (AgNPs). The prepared AgNPs-PDA-wax gourd exhibited excellent light absorption (>94%) in the whole solar spectrum (300-2500 nm). Under 1 sun illumination, the prepared evaporator achieved an extraordinary evaporation rate of 1.70 kg m −2 h −1 (efficiency of 83.21%), which was 3.78 and 1.21 times higher than the rates of natural wax gourd and PDA-wax gourd, respectively. Such excellent performance was mainly attributed to the synergic light-to-heat conversion capability between localized surface plasmon resonance effect from AgNPs and enhanced light-adsorption ability from PDA. Due to the presence of AgNPs, the final evaporator also displayed a fascinating antibacterial behavior for both E. coli and S. aureus even during evaporating actual lake water. Meanwhile, the AgNPs-PDA-wax gourd presented good durability during 10-cycled experiments, seawater desalination, dye water purification and some extreme conditions (acid, alkaline and freezing). These results suggested the great potential for future practical applications of such biomass solar evaporators.
研究领域:
材料科学
·
环境科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 10
·1-12
·
IF 5.705
Xu Cuxing,Hei Yashuang,Liu Jingju,Sun Mimi,Sha Tianze,Wang Nan,Hassan Mehboob,Bo Xiangjie,Zhou Ming
The authors describe a method for synthesis of a three-dimensional (3D) interconnected carbon nanorod aerogel (3D-ICNA) starting from wax gourd ( Benincasa hispida ) which is a low-cost biomass. The 3D-ICNA possesses unique 3D interconnected and porous nanostructure, with abundant edge-plane-like defective sites, a large specific surface area (823 m 2 g −1 ) and a large pore volume (0.12 cm 3 g −1 ). This makes the material attractive in terms of electrochemical sensing. To validate the feasibility, the voltammetric response towards ferricyanide, hydrogen peroxide (H 2 O 2 ), acetaminophen, ascorbic acid (AA), dopamine, uric acid and epinephrine was investigated by using a glassy carbon electrode (GCE) modified with 3D-ICNA. The modified GCE shows higher electron-transfer capacity than a conventional GCE. In addition, as an electrochemical sensor for AA or H 2 O 2 , the electrode exhibits better analytical performance with lower detection limit [3.5 μM for AA or 0.68 μM for H 2 O 2 based on 3σ/m criterion (where σ is the standard deviation of the blank and m is the slope of the calibration plot)], wider linear range and higher sensitivity (0.14, 0.11 and 0.080 μA μM −1 cm −2 for AA or 0.24 and 0.20 μA μM −1 cm −2 for H 2 O 2 ) compared to a plain GCE or a carbon nanotube-modified GCE. The modified GCE exhibits a large potential for the amperometric determination of AA or H 2 O 2 in real samples.
By employing the biomass of wax gourd ( Benincasa hispida ) as the precursor, a three-dimensional interconnected carbon nanorod aerogel was prepared. It is shown to be a viable material for the construction of an advanced electrochemical sensor for H 2 O 2 and ascorbic acid.
研究领域:
材料科学
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）