Miaoyu Li, Pupu Yang, Wenjie Lv, Qie Liu, Yujie Wu, Shiqian Du, Gen Huang, Zuyao Jiang, Jingjing Wang, Yabin Xu, Yangyang Zhou, Shanfu Lu, Li Tao, Shuangyin Wang
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引用次数: 0
Abstract
Ruthenium (Ru) is a promising electrocatalyst for hydrogen oxidation reaction (HOR) due to the similar metal hydrogen bond energy to Pt. However, Ru is easily deactivated or dissolved under an oxidation potential, which makes it unavailable in proton exchange membrane fuel cells. In this work, ultrastable Ru-based electrocatalysts for HOR in high-temperature polymer electrolyte membrane fuel cells (HT-PEMFCs) were developed by Mo doping. Under the operation conditions of HT-PEMFCs, thermal reduction inhibited the production of amorphous Ru oxide (RuO2) in the Ru-based electrocatalysts during the HOR. Mo doping significantly improved the stability of the electrocatalyst by decreasing the reduction temperature of RuO2 and accelerating the HOR by reducing the adsorption of H*. RuMo/C exhibited excellent HOR activity at high temperatures due to thermal reduction inhibition of electrooxidation; the fabricated HT-PEMFCs exhibited long-term stability and a 1050 mW cm−2 peak power density, comparable to the commercial Pt catalyst. This work provides a novel strategy for designing electrocatalysts by combining material intrinsic properties and work conditions, which could promote the development of advanced electrocatalysts for HT-PEMFCs.
期刊介绍:
CCS Chemistry, the flagship publication of the Chinese Chemical Society, stands as a leading international chemistry journal based in China. With a commitment to global outreach in both contributions and readership, the journal operates on a fully Open Access model, eliminating subscription fees for contributing authors. Issued monthly, all articles are published online promptly upon reaching final publishable form. Additionally, authors have the option to expedite the posting process through Immediate Online Accepted Article posting, making a PDF of their accepted article available online upon journal acceptance.