期刊
APPLIED SURFACE SCIENCE
卷 509, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2019.144898
关键词
Mo-Ni; Bifunctional material; Oxygen reduction; Oxygen evolution; Oxygen vacancies
类别
资金
- Mexican Council of Science and Technology (CONACYT) [269546, 299058]
- Energy Department (SENER) [269546, 299058]
In this work, a 3d metal (Ni) and a 4d metal (Mo) were mixed using tungstic acid (TA) as particle size/shape controller to develop a MoOx,-NiO (labelled as Mo-Ni) bifunctional electrocatalyst for oxygen reduction (ORR) and oxygen evolution (OER) reactions in alkaline medium. The formation of MoOx,-NiO was determined by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). XPS also revealed that the Mo-Ni material contained oxygen vacancies, while transmission electron microscopy (TEM) indicated that MoOx,-NiO material had sub < 20 nm particle sizes. EDX mapping analysis performed at different electrochemical cycles revealed that the composition (4:1 Mo to Ni) was kept. The Mo-Ni material presented a similar current density than Pt/C during the ORR, displaying a half-wave overpotential of 110 mV. For OER, the Mo-Ni material required 60 mV more energy than a commercial IrO2/C to achieve 10 mA cm(-2), and 170 mV less energy than Pt/C. Additionally, the Mo-Ni material displayed superior durability for both reactions, keeping 92% of its initial current during the ORR after 8 h of operation, and 100% during the OER, being more stable than commercial Pt/C and IrO2/C.
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