Enhancement mechanism of full-solar-spectrum catalytic activity of g-C3N4-x/Bi/Bi2O2(CO3)1-x(Br, I)x heterojunction: The roles of plasma Bi and oxygen vacancies

2022 ◽  
Vol 430 ◽  
pp. 132740
Min Wang ◽  
Guoqiang Tan ◽  
Huijun Ren ◽  
Long Lv ◽  
Ao Xia
Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 772
Yanxiong Liu ◽  
Changhua Hu ◽  
Longchun Bian

The correlation between the occurrence state of surface Pd species of Pd/CeO2 for lean CH4 combustion is investigated. Herein, by using a reduction-deposition method, we have synthesized a highly active 0.5% PdO/CeO2-RE catalyst, in which the Pd nanoparticles are evenly dispersed on the CeO2 nanorods CeO2-R. Based on comprehensive characterization, we have revealed that the uniformly dispersed Pd nanoparticles with a particle size distribution of 2.3 ± 0.6 nm are responsible for the generation of PdO and PdxCe1−xO2−δ phase with –Pd2+–O2−–Ce4+– linkage, which can easily provide oxygen vacancies and facilitate the transfer of reactive oxygen species between the CeO2-R and Pd species. As a consequence, the remarkable catalytic activity of 0.5% Pd/CeO2-RE is related to the high concentration of PdO species on the surface of the catalyst and the synergistic interaction between the Pd species and the CeO2 nanorod.

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 312 ◽  
Antonella Glisenti ◽  
Andrea Vittadini

The effects of modifying the composition of LaCoO3 on the catalytic activity are predicted by density functional calculations. Partially replacing La by Sr ions has benefical effects, causing a lowering of the formation energy of O vacancies. In contrast to that, doping at the Co site is less effective, as only 3d impurities heavier than Co are able to stabilize vacancies at high concentrations. The comparison of the energy profiles for CO oxidation of undoped and of Ni-, Cu-m and Zn-doped (La,Sr)CoO3(100) surface shows that Cu is most effective. However, the effects are less spectacular than in the SrTiO3 case, due to the different energetics for the formation of oxygen vacancies in the two hosts.

2021 ◽  
Vol 45 (12) ◽  
pp. 5704-5711
Luming Wu ◽  
Yu Hao ◽  
Shaohua Chen ◽  
Rui Chen ◽  
Pingchuan Sun ◽  

Rare earth metal doped ZrO2 can promote the formation of oxygen vacancies in zirconia, which enhances the metal–support interaction, finally promoting catalytic activity of FA dehydrogenation.

2019 ◽  
Vol 9 (21) ◽  
pp. 5906-5914 ◽  
Yongxi Zan ◽  
Zhengping Zhang ◽  
Meiling Dou ◽  
Feng Wang

A sulfur, nitrogen and phosphorus ternary-doped cattle-bone-derived hierarchically porous carbon metal-free electrocatalyst was synthesized, exhibiting superior oxygen reduction performance compared to Pt/C.

2020 ◽  
Vol 20 (5) ◽  
pp. 2791-2802
Duangamol Ongmali ◽  
Sakollapath Pithakratanayothin ◽  
Sureerat Jampa ◽  
Apanee Luengnaruemitrchai ◽  
Thanyalak Chaisuwan ◽  

In this work, a ceria (CeO2) support was modified with titania (TiO2) by nanocasting using MCM-48 as a hard template and then loading Cu (as the nitrate salt) at different levels (3–9% by weight) by deposition-precipitation followed by calcination. The addition of TiO2 in MSP CeO2 revealed that the MSP CeO2 was significantly improved the oxygen vacancies of the catalyst by increasing the Ce3+ content from 38 to 75% and stabilizing the Ce3+ species by bonding with the oxygen as Ce(4f)-O(2p)-Ti(3d). Moreover, the bonding of MSP CeO2 with TiO2 generated the oxygen defect vacancies (s–Ti3+), allowing Cu2+ to occupy and be reduced to Cu+ during calcination. The smaller CeO2 crystallite size (2.7 nm) of 9Cu/CeO2–TiO2 increased the mass-specific CO-Oxidation, showing the best catalytic activity due to its highest redox properties, as determined by H2-TPR and also showing resistant property to water and carbon dioxide. Indeed, water was adsorbed on the Ce3+ sites, generating OHads which reacted with CO to form –COOH, resulting in CO2.

2019 ◽  
Vol 6 (7) ◽  
pp. 1735-1743 ◽  
Jing Shi ◽  
Huixiang Wang ◽  
Yequn Liu ◽  
Xiaobo Ren ◽  
Haizhen Sun ◽  

CeO2 octahedra are prepared rapidly and they exhibit improved catalytic activity due to high concentration of oxygen vacancies and exposed (111) facets.

2020 ◽  
Vol 8 (32) ◽  
pp. 16676-16689 ◽  
John Humphreys ◽  
Rong Lan ◽  
Shigang Chen ◽  
Shanwen Tao

The SMSI between Fe and oxygen vacancies in Ce0.8Sm0.2O2−δ helps to weaken and break the strong NN bonds in N2, increasing the catalytic activity. Materials with anion vacancies improve oxygenate tolerance property of ammonia synthesis catalysts.

2021 ◽  
Vol 46 (1) ◽  
pp. 676-682
Jiajia Lu ◽  
Guangfu Qian ◽  
Lin Luo ◽  
Huibing He ◽  
Shibin Yin

2017 ◽  
Vol 46 (40) ◽  
pp. 13903-13911 ◽  
Xiangzhi Cui ◽  
Ryan O'Hayre ◽  
Svitlana Pylypenko ◽  
Linlin Zhang ◽  
Liming Zeng ◽  

The redox couples Co4+/Co3+ and Fe3+/Fe2+, and oxygen vacancies in mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3−δ endow the precious metal-free cathode catalyst with high ORR catalytic activity, and more importantly excellent methanol tolerance and electro-catalytic stability.

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