MCF最新热点文章-2019年6月

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Ultrathin 2D Cu-porphyrin MOF nanosheets as a heterogeneous catalyst for styrene oxidation

Yawen Xiao, Wenxiao Guo, Huanhuan Chen, Hongfeng Li, Xiujie Xu, Peng Wu, Yu Shen, Bing Zheng, Fengwei Huo and Wei David Wei

Mater. Chem. Front., 2019, Advance Article

http://dx.doi.org/10.1039/C9QM00201D

2D MOF nanostructures have shown promising properties in heterogeneous catalysis. Herein, we synthesized ultrathin 2D Cu-porphyrin MOF nanosheets and demonstrated their excellent catalytic performance in styrene oxidation (94% conversion efficiency), which was attributed to the material's high density of exposed active sites and low diffusion barriers.

A versatile ethanolic approach to metal aerogels (Pt, Pd, Au, Ag, Cu and Co)

Maximilian Georgi, Benjamin Klemmed, Albrecht Benad and Alexander Eychmüller

Mater. Chem. Front., 2019, Advance Article

http://dx.doi.org/10.1039/C9QM00193J

We present a universal one-step approach to generate metal aerogels at room and at dry ice cold temperature, abbreviated as DICE. Performing the synthesis completely in an ethanolic phase allows for the formation of pure noble (Pt, Pd, Au and Ag) and less noble metal (Cu and Co) gels in a remarkably short period of time compared to the widespread aqueous synthesis strategies. Furthermore, three-dimensional disordered, porous networks were obtained for each system with high surface areas of 860 m² mol⁻¹ for Ag up to 5470 m² mol⁻¹ for Co. Additionally, it is shown that the low reaction temperature of −70 °C enables the control of the gelation time without losing the structural characteristics. Moreover, with respect to industrial applications, this facile, stabilizer-free synthesis yields large amounts of materials using highly concentrated precursor solutions.

Li₄Ti₅O₁₂ quantum dot decorated carbon frameworks from carbon dots for fast lithium ion storage

Lin Li, Xinnan Jia, Yu Zhang, Tianyun Qiu, Wanwan Hong, Yunling Jiang, Guoqiang Zou, Hongshuai Hou, Xianchun Chen and Xiaobo Ji

Mater. Chem. Front., 2019, Advance Article

http://dx.doi.org/10.1039/C9QM00259F

Spinel Li₄Ti₅O₁₂ (LTO) shows great security and structural stability as a promising anode material for lithium-ion batteries (LIBs), but its application is restricted by its low conductivity and diffusion coefficient. Thus, LTO quantum dots (QDs) anchored on 3D carbon frameworks (CFs) from carbon dots are constructed to overcome these issues; LTO with a quantum size is designed to largely reduce the diffusion distance of Li⁺ and 3D CFs are introduced to enhance the electronic conductivity. As expected, the composite attains a high discharge capacity of 191 mA h g⁻¹ at 0.2C and 115.4 mA h g⁻¹ at a high rate of 40C; even when the current density is reduced back to 0.5C from 40C, the reversible capacity of 169.1 mA h g⁻¹ can still be restored and the capacity retention is 92.96%, which is much better than that of bare LTO particles. This work will provide a feasible idea for improving the performance of anode materials for LIBs.