超電大牛Yury Gogotsi新作NATURE?。。〕夒娙萜饕黄?
2020-10-27 16:01
超電大牛Yury Gogotsi去年在Science上發(fā)表一篇關(guān)于Ti3C2之后，今年又在Nautre上發(fā)表一篇文章，報道了超高具有體積比容量的Ti3C2超級電容器。之前的Science只能在薄膜的形態(tài)下取得高體積比能量，而該工作提供了一種制備二維材料“橡皮泥”的方法，這種“橡皮泥”可以根據(jù)需要制成各種所需要的形狀，而且保持其超高的體積比能量，具有良好的工業(yè)應(yīng)用前景。
Safe and powerful energy storage devices are becoming increasingly important. Charging times of seconds to minutes, with power densities exceeding those of batteries, can in principle be provided by electrochemical capacitors—in particular, pseudocapacitors 1,2 . Recent research has focused mainly on improving the gravimetric performance of the electrodes of such systems, but for portable electronics and vehicles volume is at a premium 3 . The best volumetric capacitances of carbon-based electrodes are around 300 farads per cubic centimetre 4,5 ; hydrated ruthenium oxide can reach capacitances of 1,000 to 1,500 farads per cubic centimetre with great cyclability, but only in thin films 6 . Recently, electrodes made of two-dimensional titanium carbide (Ti 3 C 2 , a member of the ‘MXene’ family), produced by etching aluminium from titanium aluminium carbide (Ti 3 AlC 2 , a
‘MAX’ phase) in concentrated hydrofluoric acid, have been shown to have volumetric capacitances of over 300 farads per cubic centimetre 7,8 .
Here we report a method of producing this material using a solution of lithium fluoride and hydrochloric acid. The resulting hydrophilic material swells in volume when hydrated, and can be shaped like clay and dried into a highly conductive solid or rolled into films tens of micrometres thick. Additive-free films of this titanium carbide ‘clay’ havevolumetric capacitances of up to 900 farads per cubic centimetre, with excellent cyclability and rate performances. This capacitance is almost twice that of our previous report 8 , and our synthetic method also offers a much faster route to film production as well as the avoidance of handling hazardous concentrated hydrofluoric acid.
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