Abstract Co9S8 nanoparticles embedded in two dimensional/three dimensional (2D/3D) porous carbon foams are synthesized from carbonized melamine foam (CMF) @Co-ZIF-L. Due to the vertical-growth of 2D Co-ZIF-L on the carbonized 3D melamine foam wires, abundant meso- and macropores are formed among Co-ZIF-L nanosheets with sufficient micropores created from the carbonization of ZIF-L; thus 2D/3D carbon foam with hierarchical pores can be obtained. Meanwhile, Co9S8 nanoparticles are formed and uniformly dispersed into porous carbon, and such carbon wrapping can effectively alleviate the volume expansion of metal sulfide; thus high electrochemical performance can be achieved. For example, the specific capacity is as high as 615 mAh g−1 at 500 mA g−1 after 450 cycles, much higher than that of pristine CMF (79.5 mAh g−1). Moreover, due to the excellent flexibility of carbonized melamine foam, such composite can be directly used as free-standing binder-free electrode for lithium ion batteries, which exhibits great potential to be used in wearable electronics.

中文翻译：

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将 Co9S8 纳米粒子嵌入具有高柔韧性和增强锂离子存储的多孔碳泡沫中

摘要 Co9S8 纳米粒子嵌入二维/三维 (2D/3D) 多孔碳泡沫材料是由碳化三聚氰胺泡沫 (CMF) @Co-ZIF-L 合成的。由于 2D Co-ZIF-L 在碳化的 3D 三聚氰胺泡沫线上垂直生长，在 Co-ZIF-L 纳米片之间形成了丰富的中孔和大孔，并且 ZIF-L 碳化产生了足够的微孔；因此可以获得具有分层孔隙的2D / 3D碳泡沫。同时，Co9S8纳米颗粒形成并均匀分散在多孔碳中，这种碳包裹可以有效缓解金属硫化物的体积膨胀；因此可以实现高电化学性能。例如，450 次循环后在 500 mA g-1 下的比容量高达 615 mAh g-1，远高于原始 CMF（79.5 mAh g-1）。而且，