Reactivity of Doped Ceria-Based Mixed Oxides for Solar Thermochemical Hydrogen Generation via Two-Step Water-Splitting Cycles

2013 ◽  
Vol 27 (10) ◽  
pp. 6068-6078 ◽  
Author(s):  
Alex Le Gal ◽  
Stéphane Abanades ◽  
Nicolas Bion ◽  
Thierry Le Mercier ◽  
Virginie Harlé
Keyword(s):  
Water Splitting ◽  
Hydrogen Generation ◽  
Mixed Oxides ◽  
Doped Ceria ◽  
Solar Thermochemical

Europium-Doped Ceria–Gadolinium Mixed Oxides: PARAFAC Analysis and High-Resolution Emission Spectroscopy under Cryogenic Conditions for Structural Analysis

2020 ◽  
Vol 124 (24) ◽  
pp. 4972-4983
Author(s):  
Sitshengisiwe Chemura ◽  
Toni Haubitz ◽  
Philipp A. Primus ◽  
Martin Underberg ◽  
Tim Hülser ◽  
...  
Keyword(s):  
Structural Analysis ◽  
High Resolution ◽  
Emission Spectroscopy ◽  
Mixed Oxides ◽  
Doped Ceria ◽  
Cryogenic Conditions

scholarly journals Solar Hydrogen Generation from Water Splitting Using ZnO/CuO Hetero Nanostructures

2014 ◽  
Vol 61 ◽  
pp. 345-348 ◽  
Author(s):  
Qiaobao Zhang ◽  
Daguo Xu ◽  
Xiang Zhou ◽  
Kaili Zhang
Keyword(s):  
Water Splitting ◽  
Hydrogen Generation ◽  
Solar Hydrogen

Increased crystallinity of RuSe2/Carbon Nanotubes for enhanced electrochemical hydrogen generation performance

Nanoscale ◽  
2021 ◽  
Author(s):  
Dongze Li ◽  
Meng Zha ◽  
Ligang Feng ◽  
Guangzhi Hu ◽  
Chaoquan Hu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Electrochemical Water Splitting

Ru-based catalyst is significant in the green hydrogen generation via electrochemical water-splitting reaction. Herein, it is found that the increased crystallinity of cubic RuSe2 nanoparticles anchored over carbon nanotubes (RuSe2/CNTs)...

Assembling γ-graphyne surrounding TiO2 nanotube arrays: An efficient p-n heterojunction for boosting photoelectrochemical water splitting

2021 ◽  
Author(s):  
Dong Qiu ◽  
Chengli He ◽  
Yuxuan Lu ◽  
Qiaodan Li ◽  
Yang Chen ◽  
...  
Keyword(s):  
Water Splitting ◽  
Charge Separation ◽  
Hydrogen Generation ◽  
Electron Injection ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Photoelectrochemical Water Splitting ◽  
Nanotube Arrays ◽  
Injection Efficiency ◽  
Electron Injection Efficiency

Photoelectrochemical water splitting is an excellent strategy for hydrogen generation, and it is pivotal to develop photoanodes with proficient sunlight harvesting, rapid charge separation, and enhanced electron injection efficiency. In...

scholarly journals Thickness-dependent photoelectrochemical properties of a semitransparent Co3O4 photocathode

2018 ◽  
Vol 9 ◽  
pp. 2432-2442 ◽  
Author(s):  
Malkeshkumar Patel ◽  
Joondong Kim
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Hydrogen Generation ◽  
Hydrogen Gas ◽  
Generation Rate ◽  
Alkaline Electrolyte ◽  
Stoichiometric Ratio ◽  
Gas Generation ◽  
Pec Cells ◽  
Gas Generation Rate

Co3O4 has been widely studied as a catalyst when coupled with a photoactive material during hydrogen production using water splitting. Here, we demonstrate a photoactive spinel Co3O4 electrode grown by the Kirkendall diffusion thermal oxidation of Co nanoparticles. The thickness-dependent structural, physical, optical, and electrical properties of Co3O4 samples are comprehensively studied. Our analysis shows that two bandgaps of 1.5 eV and 2.1 eV coexist with p-type conductivity in porous and semitransparent Co3O4 samples, which exhibit light-induced photocurrent in photoelectrochemical cells (PEC) containing the alkaline electrolyte. The thickness-dependent properties of Co3O4 related to its use as a working electrode in PEC cells are extensively studied and show potential for the application in water oxidation and reduction processes. To demonstrate the stability, an alkaline cell was composed for the water splitting system by using two Co3O4 photoelectrodes. The oxygen gas generation rate was obtained to be 7.17 mL·h−1 cm−1. Meanwhile, hydrogen gas generation rate was almost twice of 14.35 mL·h−1·cm−1 indicating the stoichiometric ratio of 1:2. We propose that a semitransparent Co3O4 photoactive electrode is a prospective candidate for use in PEC cells via heterojunctions for hydrogen generation.

scholarly journals Thermodynamics of paired charge-compensating doped ceria with superior redox performance for solar thermochemical splitting of H2O and CO2

2017 ◽  
Vol 5 (36) ◽  
pp. 19476-19484 ◽  
Author(s):  
Marie Hoes ◽  
Christopher L. Muhich ◽  
Roger Jacot ◽  
Greta R. Patzke ◽  
Aldo Steinfeld
Keyword(s):  
Doped Ceria ◽  
Oxidation Properties ◽  
Reduction And Oxidation ◽  
Solar Thermochemical

Paired charge-compensating doped ceria has great potential for solar thermochemical splitting of H2O and CO2 because of its balanced reduction and oxidation properties.

Hydrogen Generation in an Annular Micro-Reactor: an Experimental Investigation of Water Splitting Reaction Using Aluminum in Presence of Potassium Hydroxide

2018 ◽  
Vol 17 (2) ◽  
Author(s):  
Shyam P. Tekade ◽  
Diwakar Z. Shende ◽  
Kailas L. Wasewar
Keyword(s):  
Water Splitting ◽  
Potassium Hydroxide ◽  
Hydrogen Generation ◽  
Energy Content ◽  
Average Rate ◽  
High Energy ◽  
Low Flow ◽  
Flow Rates ◽  
Metal Aluminum ◽  
Micro Reactor

Abstract Hydrogen is one of the important non-conventional energy sources because of its high energy content and non-polluting nature of combustions. The water splitting reaction is one of the significant methods for hydrogen generation from non-fossil feeds. In the present paper, the hydrogen generation has been experimentally investigated with water splitting reaction using metal aluminum in presence of potassium hydroxide as an activator under flow conditions. The rate of hydrogen generation was reported in the annular micro- reactor of 1 mm annulus using various flow rates of aqueous 0.5 N KOH ranging from 1 ml/min to 10 ml/min. The complete conversion of aluminum was observed at all the flow rates of aqueous KOH. The hydrogen generation rate was observed to depend on the flow rate of liquid reactant flowing through the reactor. At 1 ml/min of 0.5 N KOH, hydrogen generates at an average rate of 3.36 ml/min which increases to 10.70 ml/min at 10 ml/min of aqueous KOH. The Shrinking Core Model was modified for predicting the controlling mechanism. The rate of hydrogen generation was observed to follow different controlling mechanisms on various time intervals at low flow rates of aqueous KOH. It was observed that chemical reaction controls the overall rate of hydrogen generation at higher flow rates of aqueous KOH.

scholarly journals Nitrogen and cobalt co-doped zinc oxide nanowires – Viable photoanodes for hydrogen generation via photoelectrochemical water splitting

2015 ◽  
Vol 299 ◽  
pp. 11-24 ◽  
Author(s):  
Prasad Prakash Patel ◽  
Prashanth Jampani Hanumantha ◽  
Oleg I. Velikokhatnyi ◽  
Moni Kanchan Datta ◽  
Daeho Hong ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Photoelectrochemical Water Splitting ◽  
Zinc Oxide Nanowires ◽  
Oxide Nanowires ◽  
Co Doped
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