2D iron/cobalt metal-organic frameworks with an extended ligand for efficient oxygen evolution reaction

Wenjing Shang; Qiulin Li; Xiang Li; Ke Zhang; Binghao Wang; Yongbing Lou; Jinxi Chen

doi:10.1039/d3dt01175e

2D iron/cobalt metal-organic frameworks with an extended ligand for efficient oxygen evolution reaction

Dalton Trans. 2023 Jun 27;52(25):8613-8619. doi: 10.1039/d3dt01175e.

Authors

Wenjing Shang¹, Qiulin Li¹, Xiang Li¹, Ke Zhang¹, Binghao Wang¹, Yongbing Lou¹, Jinxi Chen¹

Affiliation

¹ School of Chemistry and Chemical Engineering, Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and device, Southeast University, Nanjing 211189, PR China. chenjinxi@seu.edu.cn.

PMID: 37283177
DOI: 10.1039/d3dt01175e

Abstract

The design of an efficient OER catalyst is significant for water splitting. Metal-organic frameworks (MOFs) are emerging as promising electrocatalysts due to their diversity of structure and tunability of function. In this paper, 2D Fe_xCo_1-x-MOF₁/NF with an extended ligand (biphenyl-4,4'-dicarboxylic acid, BPDC) is constructed on nickel foam by a solvothermal method. Compared with the MOF₂ synthesized by using BDC (1,4-bezenedicarboxylate), MOF₁ shows excellent performance. Among MOF₁, Fe_0.5Co_0.5-MOF₁/NF exhibits outstanding performance with a low overpotential (217 mV) and a small Tafel slope (31.16 mV Dec^-1) at 10 mA cm^-2 and performs well at a high current density. In addition, the catalyst is remarkable in terms of durability both in alkaline solution and simulated seawater. The synergetic effect between Fe and Co and more active sites exposed play an important role in improving the OER activity. This work provides an effective strategy for the rational design of MOFs as inexpensive electrocatalysts.