Synergistic engineering of 'MOF-on-LDH' nanocomposites via alkaline for high-efficiency of microbial fuel cell cathode.
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75% confidenceA novel MOF-on-LDH nanocomposite (CuZr-MOF@NiFe-MLDH) was synthesized to enhance the activity and stability of MFC cathodes, resulting in a maximum power density of 283.02 mW/m², 3.76 times higher than NiFe-LDH.
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Abstract
Microbial fuel cells (MFCs) were recognized as sustainable technologies for wastewater treatment and energy production, yet their low power output and high cost hindered practical applications. In this study, a novel MOF-on-LDH nanocomposite (CuZr-MOF@NiFe-MLDH) was synthesized via a two-step hydrothermal method and co-precipitation to enhance the activity and stability of MFC cathodes. Cation vacancies in the modified LDH,denoted as NiFe-MLDH were generated by alkaline of NiFe-LDH, which improved structural stability and conductivity while facilitating CuZr-MOF doping. A hierarchical pore system and synergistic interactions among metal ions were revealed by material characterizations. Electrochemical tests demonstrated an 80 mV positive shift in the onset potential, the limiting current density was increased by a factor of 1.65. A maximum power density of 283.02 mW/m 2 was achieved by CuZr-MOF@NiFe-MLDH as an MFC cathode catalyst, which was 3.76 times higher than that of NiFe-LDH (75.27 mW/m 2 ). The MOF-on-LDH architecture optimized mass transport and electron transfer through micro-mesoporous synergy, offering a new strategy for designing high-performance MFC catalysts.