Unique nanocrystalline frameworks in mesoporous tin phosphate prepared through a hydrofluoric acid assisted chemical reaction
Unique nanocrystalline frameworks in mesoporous tin phosphate prepared through a hydrofluoric acid assisted chemical reaction
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DOI：
10.1039/c6ta09297g
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发表时间：
2016-11
影响因子：
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通讯作者：
M. Pramanik;Jaewoo Lee;Satoshi Tominaka;Y. Ide;Jung Ho Kim;Y. Yamauchi
中科院分区：
文献类型：
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作者：
M. Pramanik;Jaewoo Lee;Satoshi Tominaka;Y. Ide;Jung Ho Kim;Y. Yamauchi
以两亲性嵌段共聚物（F127）、氯化锡（SnCl 4）和磷酸（H3 PO 4）为原料，在乙醇-水混合溶剂中制备了介孔磷酸锡（SnPi）材料。具有大孔径（7.4 nm）、纳米晶壁、高表面积（310 m2 g-1）和独特的片状颗粒形状的介孔SnPi材料通过在流动的N2气和流动的空气下对母体介孔结构的SnPi进行两步热处理而成功合成。在中等条件下（293 K和60%相对湿度），我们的介孔SnPi显示6.5倍以上的质子（H+）导电性相比，其无孔/散装类似物（SnPi-B），由于其较高的表面积和独特的纳米晶多孔结构富含自由O-H基团。我们的结晶介孔SnPi作为锂离子电池（LIB）的阳极的初步电化学性能进行了研究，表现出良好的可逆比容量，良好的循环稳定性和优异的容量保持率为92%。
A mesostructured tin phosphate (SnPi) material has been prepared in the presence of an amphiphilic block copolymer (F127), tin chloride (SnCl4), and phosphoric acid (H3PO4) in an ethanol–water mixed solvent medium. The mesoporous SnPi material, with a large pore diameter (7.4 nm), nanocrystalline walls, a high surface area (310 m2 g−1), and a unique flake-like particle shape, is successfully synthesized by a two-step heat treatment of the parent mesostructured SnPi under flowing N2 gas followed by flowing air. Under moderate conditions (293 K and 60% relative humidity), our mesoporous SnPi shows 6.5 times more proton (H+) conductivity compared to its non-porous/bulk analogue (SnPi-B), due to its higher surface area and unique nanocrystalline porous structure enriched with free O–H groups. The preliminary electrochemical properties of our crystalline mesoporous SnPi as an anode for lithium-ion batteries (LIBs) have been studied as well, which exhibits good reversible specific capacity with good cycling stability and excellent capacity retention of 92%.