Bottom-Up Construction of Rhombic Lamellar CoNi-MOFs for the Electrochemical Sensing of H2S

Teng Ma; Xiao Liu; Xiaowen Wang; Jian-Gong Ma; Peng Cheng

doi:10.1021/acs.inorgchem.4c00862

Bottom-Up Construction of Rhombic Lamellar CoNi-MOFs for the Electrochemical Sensing of H₂S

Inorg Chem. 2024 Apr 22;63(16):7504-7511. doi: 10.1021/acs.inorgchem.4c00862. Epub 2024 Apr 10.

Authors

Teng Ma¹, Xiao Liu¹, Xiaowen Wang¹, Jian-Gong Ma¹, Peng Cheng¹

Affiliation

¹ Department of Chemistry, Key Laboratory of Advanced Energy Material Chemistry (MOE), Frontiers Science Center for New Organic Matter, and Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin 300071, P. R. China.

PMID: 38598777
DOI: 10.1021/acs.inorgchem.4c00862

Abstract

Lamellar metal-organic frameworks (MOFs) have attracted significant attention in the field of electrochemical sensing due to their abundant open active sites and specific electron conductivity. Herein, by employing a bottom-up synthesis strategy, rhombic lamellar heterometallic CoNi-MOFs with varying thicknesses are constructed. This is achieved by using 4-methylpyridine as a capping agent based on the (4,6)-linked Co₂(azpy)₂(bptc) (azpy = 4,4'-azopyridine, bptc = 3,3',5,5'-biphenyltetracarboxylic acid) structure with a fsc topology and by introducing Ni species simultaneously. To mitigate sulfur deposition on electrodes, the triple pulse amperometry (TPA) method is employed. Among the synthesized lamellar CoNi-MOFs, lamellar CoNi-MOF-3 with the minimum thickness exhibits an optimal electrochemical sensing performance toward hydrogen sulfide, with a sensitivity of 119.3 μA·mM^-1·cm^-2 in the linear range of 2-2000 μM. This study pioneers a new approach to the controlled construction and electrochemical activity modification of lamellar MOF materials.