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Synthesis of Pt/K2CO3/MgAlOx-reduced graphene oxide hybrids as promising NOx storage-reduction catalysts with superior catalytic performance.

ABSTRACT: Pt/K2CO3/MgAlOx-reduced graphene oxide (Pt/K/MgAlOx-rGO) hybrids were synthesized, characterized and tested as a promising NOx storage and reduction (NSR) catalyst. Mg-Al layered double hydroxides (LDHs) were grown on rGO via in situ hydrothermal crystallization. The structure and morphology of samples were thoroughly characterized using various techniques. Isothermal NOx adsorption tests indicated that MgAlOx-rGO hybrid exhibited better NOx trapping performance than MgAlOx, from 0.44 to 0.61?mmol?·?g-1, which can be attributed to the enhanced particle dispersion and stabilization. In addition, a series of MgAlOx-rGO loaded with 2?wt% Pt and different loadings (5, 10, 15, and 20?wt%) of K2CO3 (denoted as Pt/K/MgAlOx-rGO) were obtained by sequential impregnation. The influence of 5% H2O on the NOx storage capacity of MgAlOx-rGO loaded with 2?wt% Pt and 10% K2CO3 (2Pt/10?K/MgAlOx-rGO) catalyst was also evaluated. In all, the 2Pt/10?K/MgAlOx-rGO catalyst not only exhibited high thermal stability and NOx storage capacity of 1.12?mmol?·?g-1, but also possessed excellent H2O resistance and lean-rich cycling performance, with an overall 78.4% of NOx removal. This work provided a new scheme for the preparation of highly dispersed MgAlOx-rGO hybrid based NSR catalysts.

SUBMITTER: Mei X

PROVIDER: S-EPMC5311869 | biostudies-other | 2017 Feb

REPOSITORIES: biostudies-other

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Synthesis of Pt/K2CO3/MgAlOx-reduced graphene oxide hybrids as promising NOx storage-reduction catalysts with superior catalytic performance.

Mei Xueyi X Yan Qinghua Q Lu Peng P Wang Junya J Cui Yuhan Y Nie Yu Y Umar Ahmad A Wang Qiang Q

Scientific reports 20170216

Pt/K2CO3/MgAlOx-reduced graphene oxide (Pt/K/MgAlOx-rGO) hybrids were synthesized, characterized and tested as a promising NOx storage and reduction (NSR) catalyst. Mg-Al layered double hydroxides (LDHs) were grown on rGO via in situ hydrothermal crystallization. The structure and morphology of samples were thoroughly characterized using various techniques. Isothermal NOx adsorption tests indicated that MgAlOx-rGO hybri ...[more]

PMID: 28205630

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Project description:Pt/C catalysts have been considered the ideal cathodic catalyst for proton exchange membrane fuel cells (PEMFCs) due to their superior oxygen reduction reaction (ORR) catalytic activity at low temperatures. However, oxidation and corrosion of the carbon black support at the cathode result in the agglomeration of Pt particles, which reduces the active sites in the Pt/C catalyst. Graphene supports have shown great promise to address this issue, and therefore, finding out the main structural features of the graphene support is of great significance for guiding the rational construction of graphene-based Pt (Pt/graphene) catalysts for optimized ORR catalysts. In order to systematically study the influence of the structural features of the graphene support on the electro-catalytic properties of Pt/graphene catalysts, we prepared porous nitrogen-doped reduced graphene oxide (P-NRGO), nitrogen-doped reduced graphene oxide (NRGO), treated P-NRGO (TP-NRGO) and reduced graphene oxide (RGO) with different nitrogen species contents (7.76, 7.54, 3.24, and 0.14 at%), oxygen species contents (18.68, 18.12, 6.34 and 21.12 at%), specific surface areas (370.4, 70.6, 347.7 and 276.2 m2 g-1) and pore volumes (1.366, 0.1424, 1.3299 and 1.0414 cm3 g-1). The ORR activity of the four Pt/graphene catalysts when listed in the order of their half-wave potentials (E 1/2) and peak power densities was found to be as Pt/P-NRGO > Pt/NRGO > Pt/TP-NRGO > Pt/RGO. The long-term durability of Pt/P-NRGO for the operation of H2-air PEMFCs is better than that of commercial Pt/C catalysts. The excellent ORR catalytic performance of Pt/P-NRGO compared to that of the other three Pt/graphene catalysts is ascribed to the high nitrogen species content of P-NRGO that can facilitate the uniform dispersion of Pt particles and provide accessible active sites for ORR. The results indicate that the specific surface area (SSA) and heteroatom dopants have strong influence on the Pt particle size, and that the nitrogen species of graphene supports play a more important role than the oxygen species, specific surface area and pore volume for the Pt/graphene catalysts in providing accessible active sites.

Dataset Information

Synthesis of Pt/K2CO3/MgAlOx-reduced graphene oxide hybrids as promising NOx storage-reduction catalysts with superior catalytic performance.

Publications

Synthesis of Pt/K<sub>2</sub>CO<sub>3</sub>/MgAlO<sub>x</sub>-reduced graphene oxide hybrids as promising NO<sub>x</sub> storage-reduction catalysts with superior catalytic performance.

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