Mn-N-C catalysts derived from metal triazole framework with hierarchical porosity for efficient oxygen reduction

Huiying Wang; Ziyan Kong; Minghao Wang; Bing Huang; Lunhui Guan

doi:10.1088/1361-6528/acb26c

Mn-N-C catalysts derived from metal triazole framework with hierarchical porosity for efficient oxygen reduction

Nanotechnology. 2023 Jan 26;34(14). doi: 10.1088/1361-6528/acb26c.

Authors

Huiying Wang^{1

2}, Ziyan Kong^{1

2}, Minghao Wang¹, Bing Huang¹, Lunhui Guan^{1

2}

Affiliations

¹ CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China.
² College of Chemistry, Fuzhou University, Fuzhou 350108, People's Republic of China.

PMID: 36634353
DOI: 10.1088/1361-6528/acb26c

Abstract

Manganese and nitrogen co-doped porous carbon (Mn-N-C) are proposed as one of the most up-and-coming non-precious metal electrocatalysts to substitute Pt-based in the oxygen reduction reaction (ORR). Herein, we chose metal triazole frameworks as carbon substrate with hierarchical porosity for trapping and anchoring Mn-containing gaseous species by a mild one-step pyrolysis method. The optimized Mn-N-C electrocatalyst with a large metal content of 1.71 wt% and a volume ratio of 0.86 mesopores pore delivers a superior ORR activity with a half-wave potential (E_1/2) of 0.92 V in 0.1 M KOH and 0.78 V in 0.1 M HClO₄. Moreover, the modified Mn-N-C catalyst showed superior potential cyclic stability. TheE_1/2remained unchanged in 0.1 M KOH and only lost 6 mV in 0.1 M HClO₄after 5000 cycles. When applied as the cathode catalyst in Zn-air battery, it exhibited a maximum peak power density of 176 mW cm^-2, demonstrating great potential as a usable ORR catalyst in practical devices.

Keywords: hierarchical porosity, Mn–N–C catalyst; metal-triazole framework; oxygen reduction reaction.