Physical vapor deposition process for engineering Pt based oxygen reduction reaction catalysts on NbOx templated carbon support

JOURNAL OF POWER SOURCES

卷:451

Article

Xu, Chunchuan¹  Yang, Jun¹  Liu, Ershuai²  Jia, Qingying²  Veith, Gabriel M.³  Nair, Gokul³  DiPietro, Stephen⁴  Sun, Kai⁵  Chen, Jixin¹  Pietrasz, P.¹  Lu, Zijie¹  Jagner, Mark¹  Gath, Kerrie K.¹  Mukerjee, Sanjeev²  Waldecker, James R.¹ 

[1] Ford Motor Co, Dearborn, MI 48121 USA

[2] Northeastern Univ, Dept Chem & Chem Biol, Boston, MA 02115 USA

[3] Oak Ridge Natl Lab, Chem Sci Div, 1 Bethel Valley Rd, Oak Ridge, TN 37830 USA

[4] Exothermics Inc, 14 Columbia Dr, Amherst, NH 03031 USA

[5] Univ Michigan, Dept Mat Sci & Engn, 2300 Hayward St, Ann Arbor, MI 2300 USA

关键词: Oxygen reduction reaction (ORR) catalyst;    Physical vapor deposition (PVD);    Arc plasma deposition (APD);    Non-stoichiometric niobium oxide (NbOx);    X-ray absorption spectroscopy (XAS);    Membrane electrode assemble (MEA);    Accelerated stress test (AST);   

DOI  :  10.1016/j.jpowsour.2020.227709

来源: Elsevier

【 摘 要 】

Two physical vapor deposition (PVD) processes, magnetron sputtering (MS) and arc plasma deposition (APD), were investigated to prepare oxygen reduction reaction (ORR) catalysts for proton exchange membrane fuel cells (PEMFCs). The catalysts are composed of Pt or Pt alloy on a NbOx decorated carbon support (NbOx/C). The combination of these materials results in tunable structures and electronic properties and a commensurate increase in lifetime (>60% retention after 30,000 cycles) and initial MEA mass activities of over 300 Ag-Pt(-1). In situ x-ray absorption spectroscopy (XAS) shows that there exists direct interaction between Pt and the 0 in the non-stoichiometric NbOx in Pt on NbOx/C catalyst. The introduction of Co leads to shortened Pt-Pt bond distance as confirmed by XAS, and a beneficial Pt on NbOx strain effect. The relationship between Pt and NbOx loading is discussed based on rotating disk electrode (RDE) data.

【 授权许可】

Free