Germanium-Carbdiyne: A 3D Well-Defined sp-Hybridized Carbon-Based Material with Superhigh Li Storage Property

Carbyne delivers various excellent properties for the existence of the larger number of sp-hybridized carbon atoms. Here, a 3D well-defined porous carbon material germanium-carbdiyne (Ge-CDY) which is comprised of only sp-hybridized carbon atoms bridging by Ge atoms has been developed and investigated. The unique diamond-like structure constructed by linear butadiyne bonds and sp³-hybridized Ge atoms ensures the stability of Ge-CDY. The large percentage of conjugated alkyne bonds composed of sp-C guarantees the good conductivity and the low band gap, which were further confirmed experimentally and theoretically, endowing Ge-CDY with the potential in electrochemical applications. The well-defined 3D carbon skeleton of Ge-CDY provides abundant uniform nanopores, which is suitable for metal ions storage and diffusion. Further half-cell evaluation also demonstrated Ge-CDY exhibited an excellent performance in lithium storage. All those indicating sp-hybridized carbon-based materials can exhibit great potential to possess excellent properties and be applied in the field of energy, electronic, and so on.