硼、氮共掺杂多孔碳的制备及其超电容性能

分别以含氮菲咯啉、四硼酸钾和醋酸锌为碳源、活化剂和模板,制备了B、N共掺杂多孔碳(BN-PC)，并探究模板质量对BN-PC结构和储电性能的影响。当醋酸锌质量为5g时，所得BN-PC₅中B、N杂原子含量分别为 20.21%、18.29%。电化学测试结果表明，以6 mol·L^-1 KOH为电解液，BN-PC₅电极展现出高的比电容(在0.05 A·g^-1电流密度下为255 F·g^-1)、优异的倍率性能(在20A·g^-1电流密度下为188F·g^-1)和卓越的循环稳定性(在5 A·g^-1的电流密度下循环10 000次比电容保持率为97%)。以3 mol·L^-1 ZnSO₄为电解液，在平均功率密度为56W·kg^-1时，BN-PC₅电容器的能量密度可达27Wh·kg^-1。

Preparation and supercapacitive properties of B, N co-doped porous carbons

Herein, we employed (CH₃COO)₂Zn as template to prepare B, N co-doped porous carbons (BN-PC) by using phenanthroline as precursor and N source, K₂B₄O₇ as B source. The effect of template mass on the structure and electric storage properties of BN-PC₅ was investigated. When the mass of (CH₃COO)₂Zn was 5 g, the B and N heteroatom content of BN-PC₅ was 20.21% and 18.29%, respectively. As the electrode materials for supercapacitors, BN-PC₅ exhibited a high specific capacitance of 255 F·g^-1 at 0.05 A·g^-1, an excellent rate performance of 188 A·g^-1 at 20 A·g^-1 and outstanding cycle stability with 97% of initial capacitance retention after 10 000 cycles in 6 mol·L^-1 KOH aqueous electrolyte. The energy density of BN-PC₅ capacitor reached 27 Wh·kg^-1 at an average power density of 56 W·kg^-1 in 3 mol·L^-1 ZnSO₄ aqueous electrolyte.