Li Wenping, Li Chuang, Luo Jingjie, Qi Ji, Chen Xiaozhen, Wang Pan, Guan Weixiang, Liang Changhai
Laboratory of Advanced Materials & Catalytic Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
J Nanosci Nanotechnol. 2020 Feb 1;20(2):1215-1223. doi: 10.1166/jnn.2020.16969.
Designing a highly active, stable and cost-effective electrocatalyst with multiple functionalities toward hydrogen evolution and oxygen reduction applications is crucial for the development of renewable energy sources. Here, the synthesis of hollow PtNi nanostrings via a facile two-step template method is reported. The PtNi nanostrings own Pt-rich rough surfaces, and hollow string-like structure with the structural disorder morphology. Impressively, the unique hollow PtNi nanostrings exhibit excellent electrocatalytic activity toward the hydrogen evolution and oxygen reduction reactions. The obtained overpotential is only 44.60 mV at current density of 10 mA cm for hydrogen evolution reaction. Furthermore, the hollow PtNi nanostrings exhibit a high mass activity of 2.5 A mg and a superior specific activity of 3.89 mA cm at 0.90 V versus reversible hydrogen electrode in oxygen reduction reaction, respectively, which are 10 and 9 times higher than those of the commercial Pt/C. This work provides a promising approach for the synthesis of highly bifunctional electrocatalysts with a hollow sting-like structure to promote their application in the hydrogen evolution and oxygen reduction reactions.
设计一种对析氢和氧还原应用具有多种功能的高活性、稳定且具有成本效益的电催化剂对于可再生能源的发展至关重要。在此，报道了通过简便的两步模板法合成中空PtNi纳米线。PtNi纳米线具有富含Pt的粗糙表面以及具有结构无序形态的中空线状结构。令人印象深刻的是，独特的中空PtNi纳米线对析氢和氧还原反应表现出优异的电催化活性。在析氢反应中，在电流密度为10 mA cm时获得的过电位仅为44.60 mV。此外，中空PtNi纳米线在氧还原反应中相对于可逆氢电极在0.90 V时分别表现出2.5 A mg的高质量活性和3.89 mA cm的优异比活性，分别是商业Pt/C的10倍和9倍。这项工作为合成具有中空线状结构的高双功能电催化剂提供了一种有前景的方法，以促进其在析氢和氧还原反应中的应用。
