Journal
JOURNAL OF POWER SOURCES
Volume 520, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230799
Keywords
Dual-MOFs precursor; Ligand exchange; Microbial fuel cell; Oxygen reaction reduction
Funding
- State Key Laboratory of Water Resource Protection and Utilization in Coal Mining [GJNY-18-73.17]
- China Postdoctoral Science Foundation (CN) [2020M680863]
Ask authors/readers for more resources
This study demonstrates the fabrication of a dual-MOFs precursor to enhance the activity of M NCs catalysts, showing improved ORR activity through optimized electronic transfer and desirable oxygen transfer surface structure.
Microbial fuel cell (MFC) satisfies the needs of power generation and pollutants removal but still requires active electrocatalysts to accelerate cathodic oxygen reduction reaction (ORR). Metal-nitrogen-carbon materials (M NCs) derived from Prussian blue analogues (PBAs), known for low cost and high yield, fail with satisfactory surface structure and their intrinsic activity requires to be further improved. Here, a MOF@MOF precursor (CoZIF-L@CoFe PBA-1, MOF: metal-Organic framework) is skillfully fabricated by utilizing two-dimensional (2D) leaf-like cobalt-based zeolitic-imidazolate framework (Co-ZIF-L) as the mother MOF to give birth to cobalt iron Prussian blue analogue (CoFe PBA) by adjusting reaction time and solvents with a ligand exchange method. After carbonization, Co-ZIF-L@CoFe PBA-1 transforms into a leaf-shaped carbon nanoplate with heterostructured CoFe alloy and Co (Co0.7Fe0.3@Co-NC-1), which exhibits outstanding ORR activity and high MFC performance (2486 +/- 56 mW m(-2)) compared with Co-NC and Co0.7Fe0.3-NC derived from Co-ZIF-L and leaf-like CoFe PBA, respectively. The interfacial Co0.7Fe0.3@Co efficiently optimizes electronic structure for fast electrons transfer and the porous carbon matrix provides desirable surface structure for oxygen transfer, synergistically triggering a high ORR activity. Our work offers new insights for controllable preparation of PBAs-based dual-MOFs precursors and provides a feasible avenue for enhancing the activity of PBAs-based M NCs catalysts.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available