Wang Dan-Dan, Gao Xiuli, Zhao Lianming, Zhou Jin, Zhuo Shuping, Yan Zifeng, Xing Wei
School of Chemical Engineering, Shandong University of Technology Zibo 255049 P. R. China.
School of Science, State Key Laboratory of Heavy Oil Processing, China University of Petroleum Qingdao 266580 P. R. China
RSC Adv. 2018 Apr 30;8(29):16044-16051. doi: 10.1039/c8ra01027g. eCollection 2018 Apr 27.
Polydopamine-modified graphene (G-PDA) materials were synthesized by polymerization of a dopamine monomer on the surface of graphene oxide. X-ray photoelectron spectroscopy (XPS) has confirmed that new N-containing functional groups are formed during the synthesis process, which result in the excellent electrocatalytic activity of the composite towards ORR in terms of onset potential, number of electron transferred and limiting current density. The electrocatalytic activity of the optimized G-PDA sample is better than N-doped graphene and comparable to the commercial 20 wt% Pt/C catalyst. Furthermore, compared with the Pt-based catalysts, the G-PDA showed superior stability and methanol resistance, which favored its practical applications in fuel cells.
通过在氧化石墨烯表面聚合多巴胺单体合成了聚多巴胺修饰的石墨烯（G-PDA）材料。X射线光电子能谱（XPS）已证实，在合成过程中形成了新的含氮官能团，这使得该复合材料在起始电位、电子转移数和极限电流密度方面对氧还原反应（ORR）具有优异的电催化活性。优化后的G-PDA样品的电催化活性优于氮掺杂石墨烯，与商业20 wt% Pt/C催化剂相当。此外，与铂基催化剂相比，G-PDA表现出优异的稳定性和抗甲醇性，这有利于其在燃料电池中的实际应用。
