Nanoporous carbon doped ceria bismuth oxide solid solution for photocatalytic water splitting

2021 ◽  
Author(s):  
Kahkashanan Ansari ◽  
Saurabh Dalela ◽  
Sudhish Kumar ◽  
Neelu Chouhan
Keyword(s):  
Solid Solution ◽  
Water Splitting ◽  
Solid Solutions ◽  
Bismuth Oxide ◽  
Solution Method ◽  
Fluorite Phase ◽  
Doped Ceria ◽  
Carbon Doped ◽  
Oxide Solid Solution ◽  
Highly Porous

A series of carbon-doped solid solutions of ceria bismuth oxide (CBO) was prepared by solid solution method. Highly porous solid solutions crystallized in a fluorite phase and exhibited the enhanced...

Some Structural Aspects of Ionic Conductivity in Co-Doped Ceria-Based Electrolytes

2013 ◽  
Vol 58 (4) ◽  
pp. 1355-1359 ◽  
Author(s):  
M. Dudek
Keyword(s):  
Solid Solution ◽  
Chemical Composition ◽  
Ionic Conductivity ◽  
Solid Oxide Fuel Cells ◽  
Solid Solutions ◽  
Transference Number ◽  
Solid Oxide ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Co Doped

Abstract The sinters of co-doped ceria solid solutions with the formula of Ce0.85Sm0.15-x RxO1.9, where R = Y, Gd, Pr, Tb, Ox-0.15, were obtained from powders synthesised by Pechini method. The linear variation of cell parameter a vs. chemical composition was observed for Ce0.85Sm0:15-xRxO1.9, where R = Y, Gd, Tb, 0 <x<0.15 samples. However, the introduction of Pr3+ into Ce0.85Sm0.15-x PrxO1.9 caused a small deviation from linearity due to possible changes in the valence from Pr3+ to Pr4+. The determined values of oxide transference number tion for Ce0.85Sm0.15-xRxO1.9, R = Y, Gd in the temperature range 400-750°C and partial oxygen pressure from 10-6 to 1 atm were close to 1, which indicated that materials investigated exhibited practically pure ionic oxide conductivity. On the other hand, the introduction of Tb3+ or Pr3+ higher than x>0.05 into solid solution Ce0.85Sm0.15-xRxO1.9, R = Tb, Pr caused a decrease in the ionic transference number tion below 1 due to an increase in partial electronic conduction. This fact limiting investigated co-doped terbia and samaria or samaria and praseodymia ceria-based solid solutions for the further application as oxide electrolytes in solid oxide fuel cells. The analysis of bulk and grain boundary values indicated that partial substitution of Sm3+ by Y3+ or Gd3+ caused slight improvements in the ionic conductivity of Ce0.85Sm0.15-xRxO1.9. The highest ionic conductivity was found for solid solution with chemical composition Ce0.85Sm0.1Y0.05O1.9. The selected co-doped ceria samples were tested as solid electrolytes in solid oxide fuel cells operating in the intermediate temperature range 500-750°C.

scholarly journals Crystalline Oxide Solid Solutions in Oxygen Potential Gradients

1979 ◽  
Vol 34 (2) ◽  
pp. 192-199 ◽  
Author(s):  
H. Schmalzried ◽  
W. Laqua ◽  
P. L. Lin
Keyword(s):  
Solid Solution ◽  
Steady State ◽  
Numerical Solution ◽  
Solid Solutions ◽  
Potential Field ◽  
Oxygen Potential ◽  
Transport Problem ◽  
Oxide Solid Solution ◽  
Crystalline Oxide ◽  
Potential Gradients

Abstract The steady state demixing of an initially homogeneous oxide solid solution (A, B)O in an oxygen potential field is studied theoretically and experimentally.In case that DA > DB ≫ D0, the crystal is shifted with respect to the oxide lattice system toward the higher oxygen potential and is enriched in A at the side of the higher oxygen potential, while the transport of oxygen in the crystal is negligible. A numerical solution of the transport problem is presented, and the predicted effect is verified experimentally

Hydrogen production from water-splitting reaction based on RE-doped ceria–zirconia solid-solutions

2013 ◽  
Vol 38 (14) ◽  
pp. 6097-6103 ◽  
Author(s):  
Hari Prasad Dasari ◽  
Kiyong Ahn ◽  
Sun-Young Park ◽  
Ho-Il Ji ◽  
Kyung Joong Yoon ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Solid Solutions ◽  
Doped Ceria

Visible-light-driven photocatalytic H2 evolution over CdZnS nanocrystal solid solutions: interplay of twin structures, sulfur vacancies and sacrificial agents

2020 ◽  
Vol 8 (7) ◽  
pp. 3882-3891 ◽  
Author(s):  
Hai-Bo Huang ◽  
Zhi-Bin Fang ◽  
Kai Yu ◽  
Jian Lü ◽  
Rong Cao
Keyword(s):  
Solid Solution ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Water Splitting ◽  
Solid Solutions ◽  
H2 Evolution ◽  
Visible Light Driven ◽  
Photocatalytic H2 Evolution

Twinning CdZnS solid solution nanocrystals with rich sulfur vacancies show enhanced photocatalytic activity and stability for water splitting.

Scheelite-related MIIxBi1−xV1−xMoxO4 (MII – Ca, Sr) solid solution-based photoanodes for enhanced photoelectrochemical water oxidation

2020 ◽  
Vol 49 (7) ◽  
pp. 2345-2355
Author(s):  
Shilin Li ◽  
Konstantin L. Bychkov ◽  
Denys S. Butenko ◽  
Kateryna V. Terebilenko ◽  
Yukun Zhu ◽  
...  
Keyword(s):  
Solid Solution ◽  
Water Splitting ◽  
Solid Solutions ◽  
Water Oxidation ◽  
Conductive Glass ◽  
Photoelectrochemical Water Oxidation ◽  
Pec Water Splitting

Scheelite-related MIIxBi1−xV1−xMoxO4 (MII = Ca, Sr, x = 0.1 to 0.9) solid solutions deposited on FTO-conductive glass have been shown to be promising photoanodes in photoelectrochemical (PEC) water splitting.

Bismuth iron molybdenum oxide solid solution: a novel and durable electrocatalyst for overall water splitting

2020 ◽  
Vol 56 (53) ◽  
pp. 7293-7296
Author(s):  
Sakila Khatun ◽  
Poulomi Roy
Keyword(s):  
Solid Solution ◽  
Water Splitting ◽  
Alkaline Medium ◽  
Molybdenum Oxide ◽  
Term Stability ◽  
Long Term Stability ◽  
Overall Water Splitting ◽  
Oxide Solid Solution ◽  
First Time

Bismuth iron molybdenum oxide solid solution has been identified as a potential electrocatalyst for the first time. Besides its outstanding electrocatalytic performance, the material withstands highly alkaline medium, showing long-term stability.

Solar H2 Production From a Two-Step Water Splitting Process With Metal (Fe, Ni) Doped Ceria

2008 ◽  
Author(s):  
H. Kaneko ◽  
Y. Naganuma ◽  
S. Taku ◽  
K. Ouchi ◽  
N. Hasegawa ◽  
...  
Keyword(s):  
Solid Solution ◽  
Water Splitting ◽  
Metal Ion ◽  
Oxygen Deficiency ◽  
H2 Production ◽  
Doped Ceria ◽  
Solar Simulator ◽  
H2 Generation ◽  
Metal Doped ◽  
Splitting Process

Solar H2 production by the two-step water splitting process with thermochemical reaction has been proposed to convert solar energy into chemical energy. We succeeded in repeating the cyclic two-step water splitting process composed of the O2-releasing and H2-generation reactions with metal (Fe, Ni) doped ceria. The metal doped ceria with low content of metal ion (Fe3+, Ni2+) formed a solid solution with fluorite-type structure between ceria (CeO2) and metal oxide (Fe2O3, NiO). The empirical formula of the solid solution was Ce1-αMαO2−δ (M = Fe, Ni), and it was assumed that the high reactivity on the two-step water splitting process was due to an oxygen deficiency in the solid solution. The metal doped ceria with different Ce:M mole ratio (Ce:M = 0.97:0.03–0.7:0.3) was prepared through the combustion method. The two-step water-splitting process with metal doped ceria proceeded at 1673K for the O2-releasing reaction and at 1273K for the H2-generation reaction by irradiation of an infrared imaging lamp for a solar simulator. The amounts of H2 gas evolved in the H2-generation reaction with Fe-doped ceria and Ni-doped ceria with different Ce:M (M = Fe, Ni) mole ratio were 0.97–1.8 and 1.7–2.5 cm3/g, respectively, and the evolved H2/O2 ratios were approximately equaled to 2 of the stoichiometric value. The amounts of H2 and O2 gases evolved in the two-step water splitting process varied with the Ce:M mole ratio in the metal doped ceria. It was suggested that the O2-releasing and H2-generation reactions with metal doped ceria was repeated with the reduction and oxidation of Ce4+-Ce3+ enhanced by the presence of Fe or Ni ions. Furthermore, the O2-releasing reaction with Ni-doped ceria proceeded under a high O2 partial pressure atmosphere (pO2 = 0.05 atm) and at the temperature of 1773K. The progress of the O2-releasing reaction under a high pO2 indicates that metal doped ceria can be applicable for the rotary-type solar reactor developed by Tokyo Tech group for solar H2 production.

scholarly journals First-principles study on structural, electronic and optical properties of perovskite solid solutions KB1−xMgxI3 (B = Ge, Sn) toward water splitting photocatalysis

RSC Advances ◽  
2021 ◽  
Vol 11 (42) ◽  
pp. 26432-26443
Author(s):  
Chol-Hyok Ri ◽  
Yun-Sim Kim ◽  
Un-Gi Jong ◽  
Yun-Hyok Kye ◽  
Se-Hun Ryang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Water Splitting ◽  
Potassium Iodide ◽  
Solid Solutions ◽  
First Principles ◽  
Lead Free ◽  
First Principles Calculations ◽  
Electronic And Optical Properties ◽  
First Principles Study

We propose lead-free potassium iodide perovskite solid solutions KBI3 with B-site mixing between Ge/Sn and Mg as potential candidates for photocatalysts based on systematic first-principles calculations.

In-situ formed Co from Co-Mg-O solid solution synergizing with LiH for efficient ammonia synthesis

2021 ◽  
Author(s):  
Wenbo Gao ◽  
Sheng Feng ◽  
Hanxue Yan ◽  
Qianru Wang ◽  
Hua Xie ◽  
...  
Keyword(s):  
Solid Solution ◽  
Metal Nanoparticles ◽  
Magnesium Oxide ◽  
Ammonia Synthesis ◽  
Oxide Solid Solution ◽  
In Situ Formation

A cobalt magnesium oxide solid solution (Co-Mg-O) supported LiH catalyst has been synthesized, in which LiH functions both as a strong reductant for in-situ formation of Co metal nanoparticles and...

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