| 1. |
- Chang, Jian, et al.
(författare)
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Ultratough and ultrastrong graphene oxide hybrid films via a polycationitrile approach
- 2021
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Ingår i: Nanoscale Horizons. - : Royal Society of Chemistry (RSC). - 2055-6764 .- 2055-6756. ; 6:4, s. 341-347
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Tidskriftsartikel (refereegranskat)abstract
- Graphene oxide (GO) is a classic two dimensional (2D) building block that can be used to develop high-performance materials for numerous applications, particularly in the energy and environmental fields. Currently, the precise assembly of GO nanosheets into macroscopic nanohybrids of superior strength and toughness is desirable, and faces challenges and trade-offs. Herein, we exploited the freshly established polycationitrile method as a powerful molecular crosslinking strategy to engineer ultratough and ultrastrong GO/polymer hybrid films, in which a covalent triazine-based network was constructed in a mild condition to reinforce the interface between GO nanosheets. The tensile strength and toughness reached 585 +/- 25 MPa and 14.93 +/- 1.09 MJ m(-3), respectively, which, to the best of our knowledge, are the current world records in all GO-based hybrid films. As an added merit of the tailor-made polymer crosslinker, the high mechanical performance can be maintained in large part at an extremely high relative humidity of 98%. This emerging interface-engineering approach paves a new avenue to produce integrated strong-and-tough 2D nanohybrid materials that are useful in aerospace, artificial muscle, energy harvesting, tissue engineering and more.
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| 2. |
- Yao, Houze, et al.
(författare)
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Janus-interface engineering boosting solar steam towards high-efficiency water collection
- 2021
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Ingår i: Energy & Environmental Science. - : Royal Society of Chemistry (RSC). - 1754-5692 .- 1754-5706. ; :10
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Tidskriftsartikel (refereegranskat)abstract
- Solar powered clean water production has been considered a favorable way to address the problem of the global water shortage. Recently, the interfacial solar-steam generation system has greatly improved water evaporation by localizing the solar energy at an advanced solar-thermal conversion material interface. However, the specific water productivity (SWP) is still far away from a satisfactory level due to the strong mutual interference between the incident sunlight and the generated water vapor, which causes a huge loss in energy and in turn restrains the final efficiency in water evaporation and collection. SWP is the water collection per solar radiation area per hour, which reflects the actual solar efficiency for water production and a key concern in desalination. Herein, we report a rational Janus-interface solar-steam generator (J-SSG), which separates the water evaporation and the solar-thermal conversion on the two sides of the film generator. This J-SSG demonstrates a water evaporation rate of up to 2.21 kg m(-2) h(-1) under 1 sun in a large area of 100 cm(2). More importantly, a record high SWP of 1.95 kg m(-2) h(-1) is realized in a simple system, and the SWP efficiency corresponding to the ratio of SWP to evaporation rate is as high as 88%. In an outdoor test (Beijing, solar energy similar to 15 MJ m(-2) day(-1)), 10 L purified water per square meter have been easily achieved. This Janus-interface engineering of the solar-steam generator provides a novel strategy and solution for solar powered water production of practical significance.
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| 3. |
- Zhang, Miao, et al.
(författare)
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From wood to thin porous carbon membrane : Ancient materials for modern ultrafast electrochemical capacitors in alternating current line filtering
- 2021
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Ingår i: Energy Storage Materials. - : Elsevier BV. - 2405-8289 .- 2405-8297. ; 35, s. 327-333
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Tidskriftsartikel (refereegranskat)abstract
- Ultrafast electrochemical capacitors with alternating current line filtering function have attracted growing attention owing to their potential to replace the state-of-the-art bulky aluminum electrolyte capacitors. In spite of rapid advance recently involving nanomaterials as electrode building units, it remains largely unexplored how to structurally and chemically engineer electrodes out of renewable resource with competitive or better rate performance. Herein, wood as a renewable resource was used to fabricate highly conductive, robust, porous thin carbon membranes as free-standing electrodes for ultrafast electrochemical capacitors. Transformation of wood slice to carbon membrane proceeds via wet-chemical treatment of wood slices and subsequent morphology maintaining carbonization by spark plasma sintering. Judiciously combining high conductivity, characteristic porous architecture with low tortuosity and high continuity, and the ultrathin thickness down to 20 ism, the carbon membrane-based electrochemical capacitor exhibits excellent frequency response with efficient 120 Hz filtering (phase angle = - 83.5 degrees). Compared to the latest electrodes for line filtering application that are fabricated from carbon nanotubes, graphene, and MXene, the wood-derived carbon membranes possess a competitive specific areal capacitance of up to 509.7 mu F cm(-2), and extremely low resistance-capacitance constant of 164.7 mu s, plus the inexpensive scalable fabrication strategy.
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