Significant enhancement of corrosion resistance of stainless steel with nanostructured carbon coatings by substrate-cata
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ORIGINAL ARTICLE
Significant enhancement of corrosion resistance of stainless steel with nanostructured carbon coatings by substrate‑catalytic CVD Shengcheng Shu1,2 · Dan Dai1 · Chih‑Yeh Chung3 · Qilong Yuan1 · Bo Wang1 · Tien‑Tsai Hung3 · Wen Dai1,2 · Qiuping Wei4 · Li Fu5 · Jinhong Yu1,2 · Nan Jiang1,2 · He Li1,2 · Cheng‑Te Lin1,2 · Shi‑Kun Chen3 · Tsung‑Shune Chin3 Received: 16 October 2020 / Accepted: 3 November 2020 © King Abdulaziz City for Science and Technology 2020
Abstract The bipolar plate is the major component of proton-exchange membrane fuel cells and also a critical contributor to the fuel cell performance. Metallic bipolar plate (MBP) has high impact resistance but its poor chemical stability limits the service lifetime and stack stability. One of the feasible methods to enhance the corrosion resistance of MBPs is the formation of conductive protective coatings on the MBP surface. In this work, nanostructured carbon coatings were deposited on stainless steel by chemical vapor deposition using the substrate itself as catalysts. Under the optimized conditions, the corrosion potential of carbon coatings with dense spherical structure on stainless steel (2.1 VRHE) is much higher than that of uncoated one (1.2 VRHE), and even greater than that of commercial graphite bipolar plates (1.7 VRHE), showing 75% and 23.5% improvement in corrosion resistance, respectively. Moreover, the corrosion current density of stainless steel with dense sphere-assembled coatings decreases to 0.2 mA/cm2, which is two orders of magnitude lower than that of graphite bipolar plates (27.4 mA/ cm2) at the same applied potential (2.2 VRHE). The coated stainless steel with excellent anticorrosion properties has potential applications for MBPs in proton-exchange membrane fuel cells, electrochemical treatment of waste water, and current collectors in lithium-ion batteries. Keywords Nanostructured carbon coatings · Stainless steel substrate · Chemical vapor deposition · Corrosion resistance · Metallic bipolar plates
Introduction
Shengcheng Shu and Dan Dai contributed equally to this work. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13204-020-01621-6) contains supplementary material, which is available to authorized users.
Metallic bipolar plate (MBP), mostly stainless steel, is regarded as a promising substitute for graphite and composite bipolar plates for proton-exchange membrane fuel cells, due to its excellent electrical conductivity, good impact resistance, mechanical strength, gas-tightness, and low production cost (Song et al. 2019). However, when used 2
* Shi‑Kun Chen [email protected]
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3
* Tsung‑Shune Chin [email protected]
Department of Materials Science and Engineering, Feng Chia University, Taichung 40724, Taiwan, China
4
School of Materials Science and Engineering, Central South University, Changsha 410083, China
5
Col
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