Key Findings
The TAC-linked multimetal MOF delivered the highest performance among the tested electrodes in rechargeable zinc–air batteries. Assembled devices achieved a current density of 60 mA cm−2, a round-trip efficiency of approximately 60%, and a charge–discharge voltage gap of 0.8–0.9 V. During long-term cycling at 5 mA cm−2, the material remained stable for more than 13 days.
Technical Details
Researchers synthesized polymetallic framework films directly on carbon cloth using cathodic electrodeposition. The frameworks combined nickel, cobalt, iron, and manganese centers. To evaluate the effect of carboxylate coordination, three different organic ligands were compared: trimesic acid (TAC), terephthalic acid (BDC), and 2,6-naphthalenedicarboxylic acid (NDC).
- Oxygen Evolution Reaction (OER): The NDC-based MOF showed the lowest overpotential at 310 mV (at 10 mA cm−2), followed by TAC (340 mV) and BDC (350 mV). This variation is attributed to the electrochemically active surface area and the redistribution of electrons at metal sites.
- Oxygen Reduction Reaction (ORR): All three samples exhibited similar half-wave potentials of approximately 0.76 V. However, Koutecky–Levich analysis indicated that the TAC-based material had an electron-transfer number of about 3.8, suggesting a higher contribution from the four-electron pathway.
Background & Context
The study focused on the relationship between ligand structure and the resulting bifunctional catalytic behavior. By retaining the same four metal centers while varying the organic linker, the investigators examined how coordination affects metal–oxygen interactions and electron distribution. The research was conducted by Silvia N. Cruz Orellana, Próspero Acevedo-Peña, and Edilso Reguera.
Significance & Outlook
The results indicate that the selection of the carboxylate linker is a critical factor in optimizing both the catalytic properties and the device-level performance of multimetal MOFs. While the TAC-linked framework showed superior stability and efficiency, the study notes that the findings are based on specific experimental conditions and do not yet establish performance against commercial benchmarks or fully define long-term degradation mechanisms.
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