A pulse electrochemical deposition method to prepare membrane electrode assemblies with ultra-low anode Pt loadings through in situ construction of active core-shell nanoparticles on an electrode

详细信息    查看全文

• 作者：Dai Dang ; Shijun Liao ; ^{chsjliao@scut.edu.cn" class="auth_mail} ; Fan Luo ; Sanying Hou ; Huiyu Song ; Peiyan Huang
• 关键词：Ultra-low Pt loading ; Cell performance ; Core&ndash ; shell structure ; Membrane electrode assembly
• 刊名：Journal of Power Sources
• 出版年：15 August, 2014
• 年：2014
• 卷：260
• 期：Complete
• 页码：27-33
• 全文大小：1541 K

文摘

Ultra-low Pt loading membrane electrode assemblies (ULP MEAs) are prepared through in situ construction of core-shell Ir@Pt nanoparticles (Ir/Vulcan XC-72R as the core) on the surface of an electrode via a pulse electrochemical deposition (PED) approach. The core material is coated on a membrane with a conventional catalyst-coated membrane process prior to the deposition of the shell metal (Pt in this case). The ULP MEAs are characterized by X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and X-ray Photoelectron Spectroscopy (XPS). The effects of a number of preparation parameters on cell performance are investigated in detail. The performance of the ULP MEA, in which the anode loadings of Pt and metals are 鈭?.012聽mg聽cm^鈭? and 0.044聽mg聽cm^鈭?(0.012聽mg聽cm^鈭? Pt聽+聽0.032聽mg聽cm^鈭? Ir) respectively, is found to be competitive with that of an MEA prepared with an anode Pt loading of 0.1聽mg聽cm^鈭? (commercial Pt/C catalyst from Johnson Matthey), manifesting the solid advantage of this in situ PED method.