One–step Synthesis of MnO/Ni Nanoparticles Anchored on Porous Nitrogen–doped Carbons from Melamine Foam and Electrocatalytic Study towards Oxygen Reduction Reaction

Abstract

The exploration of non-noble metal catalysts for the oxygen reduction reaction (ORR) is of great significance in energy conversion devices, such as fuel cells and metal-air batteries. In this work, a hybrid catalyst composed of MnO/Ni nanoparticles anchored on porous branched nitrogen-doped carbons (MnO/ Ni@BNCs) were prepared by direct pyrolyzing melamine foams containing Mn(II) and Ni (II) ions at 800 8C under N 2 atmosphere. On the basis of electrochemical tests, it was found that the MnO/Ni@BNCs hybrid catalyst showed a high efficient fourelectron catalytic pathway towards ORR and gave a low yield of H 2 O 2 (< 7.53 %). It also exhibited a good catalytic stability and methanol tolerance, exceeding the commercial Pt/C catalyst. The excellent catalytic performance was attributed to the synergetic effect between high catalytic activity of MnO and high electrical conductivity of Ni. Furthermore, the high surface area and porous structure characters of carbon support, which partially inherited the microstructure of melamine foam, also benefited the electron transfer and reactive species transformation during ORR process.[a] Prof.

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“…Further, the deconvolution of Mn 2p 3/2 peak gave two peaks at 641.6 eV and 645 eV (see Fig. 3d), which attributed to Mn 2+ (MnO) and its satellite peak [48]. The Pt 4f spectra (see Fig.…”

Peroxidase-Like Behavior of Ni Thin Films Deposited by Glancing Angle Deposition for Enzyme-Free Uric Acid Sensing

“…The Ni (2p) spectrum exhibits peaks for metallic Ni (at 852.2 and 869.5 eV), but higher-energy peaks are also observed for Ni 2+ at 855 and 872.8 eV (together with their associated satellite peaks at 860.7 and 879.2 eV). 35,36 These higher-energy peaks likely arise as a result of spontaneous oxidation of the Ni surface following deposition, and they indicate that nickel oxide species may be present at the catalytically active surfaces. 37 In the C (1s) spectrum (Figure 2b), the peaks at 284.8 and 287.2 eV are, respectively, attributed to C−C and C−O from adventitious carbon adsorbed on the Ni surface.…”

Design of Melamine Sponge-Based Three-Dimensional Porous Materials toward Applications

“…For example, Ge nanoparticles encapsulated in carbonized MS and the obtained electrode exhibit a high capacity of 878 mAh/g at a current density of 0.5 A/g after 150 cycles whereas bare Ge was only 248 mAh/g . MnO/Ni nanoparticles were anchored on porous N-doped carbon formed by carbonization of MS and used for the oxidation reduction reaction (ORR) . Besides metal/metal oxides coating, heteroatom doping is another way to synthesize metal-free electrodes.…”

“…65 MnO/Ni nanoparticles were anchored on porous N-doped carbon formed by carbonization of MS and used for the oxidation reduction reaction (ORR). 66 Besides metal/metal oxides coating, heteroatom doping is another way to synthesize metal-free electrodes. For example, 3D sulfurdoping carbon nitride was obtained via sulfur-doped MS and used as a metal-free electrocatalyst for ORR.…”