scholarly journals A-site substitution effect of perovskite-type cobalt and manganese oxides on two-step water splitting reaction for solar hydrogen production

2017 ◽  
Author(s):  
Hiroshi Kaneko ◽  
Takumi Hasegawa ◽  
Kohei Mori
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Manganese Oxides ◽  
Substitution Effect ◽  
Solar Hydrogen ◽  
Solar Hydrogen Production ◽  
A Site ◽  
Perovskite Type

H2 Generation by Two-Step Water Splitting With CeO2-MOx Using Concentrated Solar Thermal Energy

Solar Energy ◽  
2006 ◽  
Author(s):  
Hiroshi Kaneko ◽  
Hideyuki Ishihara ◽  
Takao Miura ◽  
Hiromitsu Nakajima ◽  
Noriko Hasegawa ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Thermal Energy ◽  
Infrared Imaging ◽  
Solar Thermal ◽  
Solar Thermal Energy ◽  
Solar Simulator ◽  
Solar Hydrogen ◽  
H2 Generation ◽  
Solar Hydrogen Production

CeO2-MOx (M = Mn, Fe, Ni, Cu) reactive ceramics, having high melting points and high conductivities of O2−, were synthesized with the combustion method from their nitrates for solar hydrogen production. The prepared CeO2-MOx samples were solid solutions between CeO2 and MOx with the fluorite structure through XRD. Two-step water splitting reactions with CeO2-MOx reactive ceramics proceeded at 1573–1773K for the O2 releasing step and at 1273K for the H2 generation step by irradiation of infrared imaging furnace as a solar simulator. The amounts of O2 evolved in the O2 releasing reaction with CeO2-MOx and CeO2 systems increased with the increase of the reaction temperature. The amounts of H2 evolved in the H2 generation reaction with CeO2-MOx systems except for M = Cu were more than that of CeO2 system after the O2 releasing reaction at the temperatures of 1673 and 1773K. The largest amount of H2 was generated with CeO2-NiO after the O2 releasing reaction at 1573, 1673 and 1773K. The O2 releasing reaction at 1673K and H2 generation reaction at 1273K with CeO2-Fe2O3 were repeated four times with the evolving of O2 (1.3cm3/g-sample) and H2 (2.3cm3/g-sample) gases, respectively. The possibility of solar hydrogen production with CeO2-MOx (M = Mn, Fe, Ni) reactive ceramics system by using concentrated solar thermal energy was suggested.

Photocatalysis and solar hydrogen production

2007 ◽  
Vol 79 (11) ◽  
pp. 1917-1927 ◽  
Author(s):  
Akihiko Kudo
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Band Gap ◽  
Water Splitting ◽  
Environmental Issues ◽  
Apparent Quantum Yield ◽  
Solar Hydrogen ◽  
Visible Light Driven ◽  
Solar Hydrogen Production ◽  
Narrow Band Gap Semiconductors

Photocatalytic water splitting is a challenging reaction because it is an ultimate solution to energy and environmental issues. Recently, many new powdered photocatalysts for water splitting have been developed. For example, a NiO (0.2 wt %)/NaTaO3:La (2 %) photocatalyst with a 4.1-eV band gap showed high activity for water splitting into H2 and O2 with an apparent quantum yield of 56 % at 270 nm. Overall water splitting under visible light irradiation has been achieved by construction of a Z-scheme photocatalysis system employing visible-light-driven photocatalysts, Ru/SrTiO3:Rh and BiVO4 for H2 and O2 evolution, and an Fe3+/Fe2+ redox couple as an electron relay. Moreover, highly efficient sulfide photocatalysts for solar hydrogen production in the presence of electron donors were developed by making solid solutions of ZnS with AgInS2 and CuInS2 of narrow band gap semiconductors. Thus, the database of powdered photocatalysts for water splitting has become plentiful.

Recent progress in photoelectrochemical water splitting for solar hydrogen production

2015 ◽  
Vol 358 ◽  
pp. 236-247 ◽  
Author(s):  
Zhan Shi ◽  
Xin Wen ◽  
Zhongjie Guan ◽  
Dapeng Cao ◽  
Wenjun Luo ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Recent Progress ◽  
Photoelectrochemical Water Splitting ◽  
Solar Hydrogen ◽  
Solar Hydrogen Production
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