Rapid degradation of cell performance still remains a significant challenge for proton exchange membrane fuel cell (PEMFC). In this work, we develop novel CeO2 nanocubes-graphene oxide nanocomposites as durable and highly active catalyst support for proton exchange membrane fuel cell. We show that the use of CeO2 as the radical scavenger in the catalysts remarkably improves the durability of th...

The activity of reducible metal oxide Sm2O3, CeO2, and ZnO as Ni nanoparticles support was investigated for CO2 methanation reaction. carried out between 200 °C to 450 with the optimum catalytic observed at °C. reducibility catalysts has been comparatively studied using H2-Temperature Reduction Temperature (TPR) method. H2-TPR analysis also elucidated formation surface oxygen vacancies temperat...

We performed inhalation and intratracheal instillation studies of cerium dioxide (CeO2) nanoparticles in order to investigate their pulmonary toxicity, and observed pulmonary inflammation not only in the acute and but also in the chronic phases. In the intratracheal instillation study, F344 rats were exposed to 0.2 mg or 1 mg of CeO2 nanoparticles. Cell analysis and chemokines in bronchoalveola...

The effect of different cations (M=Zr, Sn or Ti) doping on ceria supported nickel (Ni-Ce0.8M0.2O2) catalysts and their performance in the CO2 methanation reaction has been investigated. Among prepared catalysts, Ni-CeO2 (CN) catalyst exhibited best catalytic with a conversion 62.9% at 400 °C. selectivity Ni-Ce0.8Zr0.2O2 (CZN) remained above 98.4% from 200 to As confirmed by in-situ DRIFTS, diss...

GdBa2Cu3O7 - δ (GdBCO) films with different thicknesses from 200 to 2,100 nm are deposited on CeO2/yttria-stabilized zirconia (YSZ)/CeO2-buffered Ni-W substrates by radio-frequency magnetron sputtering. Both the X-ray diffraction and scanning electron microscopy analyses reveal that the a-axis grains appear at the upper layers of the films when the thickness reaches to 1,030 nm. The X-ray photo...

Utilization of the renewable energy sources is one main challenges in state-of-the-art technologies for CO2 recycling. Here we have taken advantage solar light harvesting thermocatalytic approach to carbon dioxide methanation. The large-surface-area Ni/CeO2 catalyst produced by a scalable low-cost method was characterized and tested dark under irradiation conditions. Light-assisted conversion e...

Coupling inherently fluctuating renewable feedstocks to highly exothermic catalytic processes, such as CO2 methanation, is a major challenge large thermal swings occurring during ON- and OFF- cycles can irreversible deactivate the catalyst via metal sintering pore collapsing. Here, we report stable active Ni supported on CeO2 nanorods that outperform commercial (octahedral) counterpart methanat...

Ni/oxide-SiO2 (oxide: MgO, CeO2, La2O3, 10 wt.% target concentration) catalyst samples were prepared by successive impregnation of silica matrix, first with supplementary oxide, and then Ni (10 concentration). The matrix multimodal pore structure was solvothermal method. structurally characterized N2 adsorption-desorption, XRD, SEM/TEM, functionally evaluated temperature programmed reduction (T...

in this research a layer of ni-cu-p was deposited on 304 stainless steels by using gelatin and thiourea asadditives in a sulfate solution. in order to determine the properties of deposited layers, a microhardness testerwas used for microhardness measurement, x.r.d. for microstructural analysis, and a scanning electronmicroscope equipped with e.d.x. for determining morphology and analyzing the d...

Cerium oxide (CeO2) particle reinforced Ni-B composite coating was produced by electroless method from a bath containing CeO2 particles. In the plating bath, nickel sulfate hexahydrate ((NiSO4.6H2O) used as source, dimethylamine borane ((CH3)2NHBH3) reducing agent, thiourea (CH4N2S) stabilizer and sodium acetate (CH3COONa) complexing agent. The aim of study is to investigate structural characte...