High-valence tungsten doping induces lattice expansion in Mo–Cu metal-organic framework-derived metal oxide-carbon composite (W@Mo–Cu MOF-MOCC) for enhanced urea electrooxidation catalysis

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dc.contributor.authorLinkov, Vladimir
dc.contributor.authorZheng, Yibing
dc.contributor.authorKannan, Palanisamy
dc.date.accessioned2025-12-10T10:25:35Z
dc.date.available2025-12-10T10:25:35Z
dc.date.issued2025
dc.description.abstractIn this work, we report W@Mo–Cu metal-organic framework-derived metal oxide-carbon composite (W@Mo–Cu MOF-MOCC) as promising catalysts for the urea oxidation reaction (UOR), achieving a high current density of 10.0 mA cm−2 at 1.38 V. This performance surpasses that of Mo–Cu MOF-MOCC (10.0 mA cm−2 at 1.53 V), Cu-MOF-MOCC (10.0 mA cm−2 at 1.60 V), and Mo-MOF-MOCC (5.0 mA cm−2 at 1.68 V). Moreover, W@Mo–Cu MOF-MOCC exhibit a lower onset potential of 1.12 V vs. RHE and the lowest Tafel slope of 77.8 mV dec−1, indicating excellent catalytic activity comparable to various Ni-based catalysts. The enhanced UOR performance is attributed to three key factors: (i) doping with a high-valence metal (W) induces lattice expansion evidenced by the formation of (110) planes-in the Mo–Cu MOF-MOCC catalyst, which modulates the nanocrystalline interface, enhances grain boundary dynamics, and promotes the generation of active MoOOH species for efficient UOR (ii) the unique chicken-piece-like globular nanostructure provides a higher surface area (148.9 m2/g) and more active sites than other morphologies (e.g., rod-like Cu-MOF-MOCC, oval-like Mo-MOF-MOCC, and polyhedral Mo–Cu MOF-MOCC); and (iii) the synergistic interaction between W and the Mo–Cu interface enhances urea adsorption and oxidation at the catalyst surface. For practicality, a urine-mediated electrolysis cell was also developed, achieving a UOR current density of 10.0 mA cm−2 at 1.37 V in urine-containing wastewater, which is over 200 mV lower than in urea-free electrolyte. Furthermore, similar performance was observed in a 1.0 M NaOH + seawater electrolyte, reaching 10.0 mA cm−2 at 1.38 V. These findings demonstrate the potential of W@Mo–Cu MOF-MOCC as multi-functional, noble-metal-free, and Ni-free catalysts for green energy production and sustainable wastewater treatment, offering promising implications for environmental safety and resource recovery.
dc.identifier.citationZheng, Y., Kannan, P., Linkov, V., Wang, H. and Ji, S., 2025. High-valence tungsten doping induces lattice expansion in Mo–Cu metal-organic framework-derived metal oxide-carbon composite (W@ Mo–Cu MOF-MOCC) for enhanced urea electrooxidation catalysis. International Journal of Hydrogen Energy, 192, p.152231.
dc.identifier.urihttps://doi.org/10.1016/j.ijhydene.2025.152231
dc.identifier.urihttps://hdl.handle.net/10566/21565
dc.language.isoen
dc.publisherElsevier Ltd
dc.subjectCo-catalytic activity
dc.subjectElectro-oxidation of urea
dc.subjectTrimetallic catalysts
dc.subjectUrine-mediated electrolysis
dc.subjectHigh-valence W doping
dc.titleHigh-valence tungsten doping induces lattice expansion in Mo–Cu metal-organic framework-derived metal oxide-carbon composite (W@Mo–Cu MOF-MOCC) for enhanced urea electrooxidation catalysis
dc.typeArticle

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