Bimetal-organic framework-derived porous CoFe2O4 nanoparticles as biocompatible anode electrocatalysts for improving the power generation of microbial fuel cells
Tingli Ren, Yuanfeng Liu, Chunhong Shi, Congju Li
Abstract
Hypothesis The relatively lower power density of Microbial fuel cells (MFCs), primarily resulting from weak biofilm habitation and sluggish extracellular electron transfer (EET) at the anode interface, limits their practical implementation on a large scale. To address this challenge, porous CoFe 2 O 4 nanoparticles could be used as anode electrocatalysts based on the following considerations: (i) the introduction of CoFe 2 O 4 nanoparticles endows the anode with a rough surface that facilitates biofilm formation; (ii) the positively charged Co and Fe ions improve the interfacial affinity of anodes, enabling rapid immobilization and colonization of negatively bacteria; (iii) the multi-valent metal states of Co and Fe can function as electron shuttles, mediating EET process between biofilm and anode. Experiments CoFe 2 O 4 nanoparticles prepared with a bimetal-organic framework (B-MOF) as precursor, were modified to the surface of carbon cloth as the anode of MFCs. Findings MFCs equipped with CoFe 2 O 4 anode achieved a maximum power density of 1026.68 mW m −2 , which was approximately 3.4 times higher than that of the pristine carbon cloth. Additionally, the biofilm density and viability on the anode were enhanced after CoFe 2 O 4 modification. Considering the facile fabrication process and superior electrocatalytic performance, the CoFe 2 O 4 nanoparticles are promising electrocatalysts for high performance and cost-effective MFCs.