Fig. 2: Morphological and structural characterizations of Ni1Mn1-MOF-Se/NF anodic catalyst.

a Schematic illustration showing the synthesis of Ni1Mn1-MOF-Se/NF. b SEM image of Ni1Mn1-MOF-Se/NF. c TEM image of Ni1Mn1-MOF-Se/NF. d HRTEM image of Ni1Mn1-MOF-Se/NF. e STEM-EDX mappings of Ni1Mn1-MOF-Se/NF. f The Ni K-edge XANES spectra of Ni1Mn1-MOF and Ni1Mn1-MOF-Se. g The Mn K-edge XANES spectra of Ni1Mn1-MOF and Ni1Mn1-MOF-Se. h The Ni K-edge EXAFS spectra of Ni1Mn1-MOF and Ni1Mn1-MOF-Se.