期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 45, 页码 16757-16765出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c03861
关键词
CeO2 nanowires; vanadium redox flow battery; oxygen vacancy; VO2+/VO2+ redox couple; electrocatalytic activity
资金
- Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education of Taiwan
- National Taiwan University of Science and Technology-Tokyo Institute of Technology
- Ministry of Science and Technology of Taiwan [MOST 107-2628-E-011-001-MY3]
A novel, low-cost, and powerful cerium-oxide nanowire (CeO2NW) electrode decorated with graphite felt (GF) through a one-step hydrothermal method was proposed in this study. Subsequently, hydrogen annealing was conducted to create defective-hydrogen-annealed CeO(2)NWs decorated with GF (H-CeO(2)NWs-GF) for use in vanadium redox flow batteries (VRFBs). The electrochemical results show that the H-CeO(2)NWs-GF reveals excellent electrocatalytic effects toward the VO2+/VO2+ redox process in VRFBs at the positive electrode to facilitate the electrochemical kinetics of the VRFBs. The VRFBs using different electrode materials were compared with a VRFB using H-CeO(2)NWs-GF. The results revealed that the VRFB using H-CeO(2)NWs-GF exhibits the highest voltage efficiency of 90.4% at a current density of 40 mA cm(-2), which is significantly higher than those using pristine GF (81.1%) and a CeO2NW electrode decorated with GF (88.4%). The significant improvement in the electrochemical performance of H-CeO(2)NWs-GF might be mostly ascribed to the defect-rich H-CeO(2)NWs on the GF surface, which acts as active sites and reduces the electrochemical polarization of the redox reaction. Moreover, the one-dimensional nature of H-CeO(2)NWs is favorable for the charge-transfer process and improves the accessibility, thus improving the electrode performance.
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