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论文类型：期刊论文

发表时间：2009-12-01

发表刊物：JOURNAL OF POWER SOURCES

收录刊物：SCIE、EI、Scopus

卷号：194

期号：2

页面范围：976-980

ISSN号：0378-7753

关键字：Chromium nitride; Stainless steel bipolar plates; Pulsed bias arc ion plating

摘要：A series of chromium nitride films are prepared on stainless steel substrates by pulsed bias arc ion plating (PBAIP) at different N(2) flow rate as bipolar plates for proton exchange membrane fuel cell (PEMFC). The film chemical composition and phase structure are characterized by X-ray photoelectron spectroscopy (XPS) and X-ray diffractometry (XRD). The characterization results indicate that the nitrogen content of deposited films varies from 0.28 to 0.50, and the phase structure changes from mixtures of Cr + Cr(2)N, pure Cr(2)N through Cr(2)N+CrN, to pure CrN. The interfacial contact resistance between samples and carbon paper is measured by Wang's method, and a minimum value of 5.8 m Omega cm(2) is obtained under 1.2 MPa compaction force. The anticorrosion property is examined by potentiodynamic test in the simulated corrosive circumstance of the PEMFC under 25 degrees C, and the lowest corrosive current density of 5.9 x 10(-7) A cm(-2) is obtained at 0.6V (vs. SCE). Stainless steel substrates coated by the film with lowest contact resistance are chosen as the bipolar plates to assemble cells. An average voltage value of 0.62V is achieved at 500 mA cm(-2), which is close to that of the cell with Ag-plated bipolar plates. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.