Effect of AC magnetic field on the OER properties of nitrogen-doped porous carbon derived from MOFs in-situ loaded carbon paper
LI Yuling1, WANG Yuanli1, LI Dongyun2, QIN Hang1, GUO Wenming1, LIU Xiaopan1, GAO Pengzhao1, XIAO Hanning1
1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China; 2. College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China
Abstract In-situ loaded two kinds of precursors MOF(denoted as Zn-MOF-74 and ZIF-8) on the surface of carbon paper (CP) were successfully prepared by solvothermal method. After high temperature heat treatment, the precursors were derived into nitrogen-doped porous carbon, and the nitrogen-doped porous carbon @CP electrocatalyst material samples were obtained, named CP-Zn-MOF-74-900-N2 and CP-ZIF-8-900-N2, respectively. The effects of CP composition, pore structure and magnetic field intensity on OER(oxygen evolution reaction) were investigated. The results show that the in-situ loaded ZIF-8 forms a dense layer of rectangular dodecahedral particles on the fiber surface of CP, and forms a uniform nanoscale nitrogen-doped carbon material on the fiber surface after heat treatment. ZIF-8-900-N2 has a specific surface area of 1559 m2/g, pore size of 0.57 nm and pore volume of 1.59 cm3/g, which has the best magnetic properties and magneto-heating properties. CP-ZIF-8-900-N2 achieves a lowest OER overpotential of 334 mV(current density of 10 mA/cm2, iR-corrected) and Tafel slope of 187 mV/dec among carbon paper and nitrogen-doped porous carbon @CP materials. When the external magnetic field exists, the OER overpotential of the catalyst first decreases and then remains unchanged with the increase of magnetic field intensity. And CP-ZIF-8-900-N2 obtains the lowest overpotential of 316 mV (current density is 10 mA/cm2, non-iR-corrected) under a magnetic field intensity of 5.54×10-3 T, which is 20.4% lower than that without AC magnetic field. This is mainly due to the reduction of bubble size and the enhancement of bubble coalescence caused by the magneto hydrodynamic effect, which improves the desorption of bubbles from the electrode surface.
LI Yuling,WANG Yuanli,LI Dongyun, et al. Effect of AC magnetic field on the OER properties of nitrogen-doped porous carbon derived from MOFs in-situ loaded carbon paper[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(2): 224-236.
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2022, Vol. 27 
