Nitrogen-doped carbon as selectively permeable layer to enhance the anti-poisoning ability of hydrogen oxidation reaction catalysts for hydroxide exchange membrane fuel cells

Insights into the Confinement Effect of NiMo Catalysts toward Alkaline Hydrogen Oxidation

“…As shown in Figure S16, NiMo-5%@C exhibits the lower apparent activity and ECSA than NiMo-5%@NC but similar j 0,s . This means the N-dopants in the carbon layers would not affect the intrinsic activity but improve the exposure of the inner active centers by creating defects in the carbon layers, which is consistent with the results of the reported literature …”

“…The highresolution TEM (HRTEM) image clearly reveals that the nanoparticles are encapsulated by carbon layers with the interlayer spacing of 0.34 nm, belonging to the (002) plane of graphitized carbon (Figure 2b). 43 For the sake of confirming the nitrogen-doping during the pyrolysis, high-resolution X-ray photoelectron spectra (XPS) of N 1s of the four samples show that N is mainly in the form of the C−N bond rather than Figure S6 exhibits the (HR)TEM images of the other three samples, in which the particle size increases along with the increase of the Mo content until NiMo-5%@NC. This could be illustrated by the decreasing degree of the carbon layer encapsulation that increases the possibility of aggregation.…”

“…Figure a shows the structures of NiMo-5%@NC where the metallic nanoparticles are well dispersed on the carbon matrix, with an average size of about 26 nm (Figure S4). The high-resolution TEM (HRTEM) image clearly reveals that the nanoparticles are encapsulated by carbon layers with the interlayer spacing of 0.34 nm, belonging to the (002) plane of graphitized carbon (Figure b) . For the sake of confirming the nitrogen-doping during the pyrolysis, high-resolution X-ray photoelectron spectra (XPS) of N 1s of the four samples show that N is mainly in the form of the C–N bond rather than metal-N in all cases (Figure S5), indicating the N-doping into the carbon layers …”

Regulation of Rate‐Determining Step on (RhxNi1‐x)2P for Enhanced Alkaline Hydrogen Oxidation Reaction

“…Recently, several Ni-based materials achieved excellent performance in AEMFCs with improved operational durability and CO-tolerance. [15][16][17][18][19] However, their catalytic efficiencies are still inferior than Pt-based catalysts, which makes it of great importance to further increase the mass activity of PGM with lower metal-loading.…”

A phosphate tolerant Pt-based oxygen reduction catalyst enabled by synergistic modulation of alloying and surface modification

“…8,9 In recent years, the construction of cladding structures on the catalyst surface or the preparation of alloys of Pt with transition metals have been the main strategies to enhance the structural stability and resistance of the catalysts to toxic impurities. [10][11][12][13][14][15][16] Hu et al fabricated an ultrathin carbon layer on the surface of Pt nanoparticles to prevent phosphoric acid adsorption by a low-temperature polymeric carbon encapsulation strategy, which showed better performance than commercial Pt/C in high-temperature fuel cell tests. 17 Zhou et al prepared a porous carbon protective layer on the Pt surface by carbonizing the pre-adsorbed Nafion coating, which prevents catalyst poisoning from the sulfonic acid group in Nafion.…”