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Bian, Y.^, Wang, S.^, Jin, D., Wang, R.*, Chen, C.*, Zhang, L.* (2020). A general anion exchange strategy to transform metal-organic framework embedded nanofibers into high-performance lithium-ion capacitors. Nano Energy, 75, 104935. (Sustainable energy)

Conversion and alloy-type nanomaterials hold great potential for versatile electrochemical applications, yet severe aggregation and structural failure have hindered their successful employment as robust electrodes. In this regard, secondary matrices are required to separate such electroactive materials and provide conductive networks concurrently. However, facile preparation of such hierarchical structures at ambient conditions and without additional energy input remains a major challenge. Here, a general co-axial electrospinning assisted anion exchange strategy is reported to construct metal-organic framework (MOF) derived nanostructures within the three-dimensional polymer network, which occurs in aqueous solutions at room temperature for simultaneous compositional and structural transformation. Such in-situ synthetic approach results in dispersed architectures of electroactive materials. As a proof of concept application (e.g., lithium-ion capacitors), well-dispersed MOF-derived CoSnx nanoparticles on carbon nanofibers are synthesized and exhibit high-energy, high-rate, and robust Li+ storage capability. This work thus contributes to developing a general MOF-based compositional and structural evolution strategy toward high-performance electrochemical applications.

Yu, X., Chen, C.* (2020). A simulation study for comparing the cooling performance of different daytime radiative cooling materials. Solar Energy Materials and Solar Cells, 209, 110459. (Radiative cooling)

With advances in design and manufacturing, the cooling performance of daytime radiative cooling materials has progressively improved. However, there has not been an effective method for comparing the cooling performance of the materials tested in different geographical locations and laboratories. Here, we present a simulation-based method, consisting of the basic radiation theory, the standard solar spectrum, and six standard model atmospheres, for comparing the cooling performance of different daytime radiative cooling materials. The proposed simulation-based comparison method was then used to compare four representative daytime radiative cooling materials selected from the literature. The results demonstrated the effectiveness of the proposed method in comparing the cooling performance of different radiative cooling materials tested under different environmental conditions. With the proposed comparison method, the engineers can choose the most suitable daytime radiative cooling material for a specific environment.

2019 Energy