- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Preparation of La<sub>0.9</sub>Sr<sub>0.1</sub>Ga<sub>0.8</sub>Mg<sub>0.2</sub>O<sub>3</sub> Film by Pulse Laser Deposition (PLD) Method on Porous Ni–Fe Metal Substrate for CO<sub>2</sub> Electrolysis
摘要： Preparation of metal supported La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) thin film cell for CO2 electrolysis was studied and by using selective reduction method of NiO–NiFe2O4, it was found that porous Ni–Fe(9:1) based substrate with ca.30% porosity was successfully prepared without large volume change resulting in the successful preparation of LaGaO3 dense thin film on metal substrate. By using Ce0.8Sm0.2O2 (SDC) thin film, Ni diffusion from Ni–Fe substrate was prevented. CO2 electrolysis was performed on the prepared LSGM/SDC on Ni–Fe porous substrate. When Sm0.5Sr0.5CoO3 (SSC) anode was prepared by screen print method using SSC powder, sintering of SSC powder was significantly occurred resulting in the large IR loss and overpotential. In contrast, when SSC anode layer was deposited by PLD (30 min) after LSGM/SDC layer deposition, tight contact between SSC anode and LSGM electrolyte film was obtained and the large CO2 electrolysis current of 3 and 0.5 A/cm2 were achieved at 973 and 773 K, respectively. Impedance analysis suggests that increased CO2 electrolysis current was obtained by decreased IR loss and electrode overpotential.
关键词： LaGaO3 thin film,CO2 electrolysis,metal support,solid oxide electrolysis cell
更新于2025-11-19 16:51:07
-
Direct in situ TEM visualization and insight of the facet-dependent sintering behaviours of gold on TiO?
摘要： To prevent sintering of supported nanocatalysts is an important issue in nanocatalysis. A feasible way is to choose a suitable support. However, whether the metal-support interactions promote or prevent the sintering has not been fully identified due to the lack of confirmed evidences. Herein, we report on completely different sintering behaviours of Au nanoparticles on distinct anatase TiO2 surfaces by in situ TEM. The full in situ sintering processes of Au nanoparticles were visualized on TiO2 (101) surface, which coupled the Ostwald ripening and particle migration coalescence. In contrast, no sintering of Au on TiO2 anatase (001) surface was observed under the same conditions. This facet-dependent sintering mechanism is fully explained by the density function theory calculations. Our work not only offers the direct evidence of the important role of supports in the sintering process, but also provides insightful information for the design of sintering-resistant nanocatalysts.
关键词： in situ TEM,particle migration and coalescence (PMC),sintering,metal?support interaction (MSI),Au-TiO2,Ostwald ripening (OR)
更新于2025-09-23 15:21:01
-
Direct in situ TEM visualization and insight of the facet-dependent sintering behaviours of gold on TiO?
摘要： To prevent sintering of supported nanocatalysts is an important issue in nanocatalysis. A feasible way is to choose a suitable support. However, whether the metal-support interactions promote or prevent the sintering has not been fully identified due to the lack of confirmed evidences. Herein, we report on completely different sintering behaviours of Au nanoparticles on distinct anatase TiO2 surfaces by in situ TEM. The full in situ sintering processes of Au nanoparticles were visualized on TiO2 (101) surface, which coupled the Ostwald ripening and particle migration coalescence. In contrast, no sintering of Au on TiO2 anatase (001) surface was observed under the same conditions. This facet-dependent sintering mechanism is fully explained by the density function theory calculations. Our work not only offers the direct evidence of the important role of supports in the sintering process, but also provides insightful information for the design of sintering-resistant nanocatalysts.
关键词： in situ TEM,particle migration and coalescence (PMC),sintering,metal?support interaction (MSI),Au-TiO2,Ostwald ripening (OR)
更新于2025-09-23 15:21:01
-
Tuning CuOx-TiO2 interaction and photocatalytic hydrogen production of CuOx/TiO2 photocatalysts via TiO2 morphology engineering
摘要： CuOx/TiO2 photocatalysts prepared with anatase TiO2 nanocrystals exposing different types of facets as supports were examined for photocatalytic H2 production in methanol/water solution under simulated solar light. Catalyst structures were characterized by XRD, HRTEM, XPS, UV–vis, EPR, PL, H2-TPR and CO chemisorption. Enhanced photocatalytic H2 productions of CuOx/TiO2 photocatalysts followed an order of CuOx/TiO2-{001} > CuOx/TiO2-{100} > CuOx/TiO2-{101}. TiO2 facets were found to strongly affect the CuOx-TiO2 interaction and structures of CuOx/TiO2 photocatalysts. Cu2O-TiO2 interaction in CuOx/TiO2-{001} photocatalyst is the strongest, resulting in the highest Cu2O dispersion and density of Cu2O-TiO2 heterojunctions active in photocatalytic H2 production. The results add insights into morphology engineering as an effective strategy to tune structures and photocatalytic activity of TiO2-based composite photocatalysts.
关键词： metal-support interaction,water reduction,charge separation,photocatalysis,facet
更新于2025-09-04 15:30:14