Li Xiaoguang, Qiu Yunfeng, Hu Ping An
J Nanosci Nanotechnol. 2016 Jun;16(6):6216-22. doi: 10.1166/jnn.2016.10860.
Heteroatom doping provides possibilities for changing the electronic properties of graphene. Three Dimensional P-doped graphene (3DPG) was fabricated via chemical vapor deposition (CVD) using nickel foam as template and triphenylphosphine (TPP) as C and P sources simultaneously without using toxic organic solvent as carrier liquid. The invasion of P atoms into graphene networks make them non-electroneutral and consequently favor the adsorption of oxygen and O-O bond cleavage due to the charge polarization increase of the P-C bond. Thus, the as-prepared 3DPG served as an efficient electrocatalyst for oxygen reduction reaction (ORR). Additionally, the 3D porous structure is favorable for the mass transfer of electrolytes ions, hence 3DPG exhibit better electrocatalytic activity, long-term stability, and tolerance to crossover effect of methanol than pristine 3D graphene and Pt/C for ORR.
杂原子掺杂为改变石墨烯的电子性质提供了可能性。以泡沫镍为模板，三苯基膦（TPP）同时作为碳源和磷源，通过化学气相沉积（CVD）法制备了三维P掺杂石墨烯（3DPG），且无需使用有毒有机溶剂作为载液。磷原子侵入石墨烯网络使其呈非电中性，进而由于P-C键电荷极化增加而有利于氧的吸附和O-O键的断裂。因此，所制备的3DPG作为氧还原反应（ORR）的高效电催化剂。此外，三维多孔结构有利于电解质离子的传质，因此与原始三维石墨烯和用于ORR的Pt/C相比，3DPG表现出更好的电催化活性、长期稳定性和对甲醇交叉效应的耐受性。
