Japanese Journal of Applied Physics
Vol. 44, No. 1A, 2005, pp. 396-401
Hydrogen Evolution by Plasma Electrolysis in
Tadahiko Mizuno*, Tadashi Akimoto, Kazuhisa
Tadayoshi Ohmori (2), Yoshiaki Aoki (3) and Akito Takahashi (4)
( Division of Quantum Energy Engineering, Graduate School of
Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan
*E-mail address: [email protected]
1. Division of Molecular Science, Graduate School of Engineering,
University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan
2. Catalysis Research Center, Hokkaido University, Kita 11 Nishi 10,
Kita-ku, Sapporo 060, Japan
3. Center for Advanced Research of Energy Technology of Hokkaido
Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan
4. Department of Nuclear Engineering, Graduate School of Engineering,
Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
Abstract: Hydrogen has recently attracted attention
a possible solution to environmental and energy problems. If hydrogen
be considered an energy storage medium rather than a natural resource.
However, free hydrogen does not exist on earth. Many techniques for
hydrogen have been proposed. It can be reformulated from conventional
fuels, or obtained directly from water by electrolysis or
pyrolysis with a heat source such as a nuclear reactor. However, the
of these methods are low. The direct heating of water to sufficiently
temperatures for sustaining pyrolysis is very difficult. Pyrolysis
when the temperature exceeds 4000°C. Thus plasma electrolysis may
a better alternative, it is not only easier to achieve than direct
but also appears to produce more hydrogen than ordinary electrolysis,
predicted by Faraday's laws, which is indirect evidence that it
very high temperatures. We also observed large amounts of free oxygen
at the cathode, which is further evidence of direct decomposition,
than electrolytic decomposition. To achieve the continuous generation
hydrogen with efficiencies exceeding Faraday efficiency, it is
to control the surface conditions of the electrode, plasma electrolysis
temperature, current density and input voltage. The minimum input
required induce the plasma state depends on the density and temperature
of the solution, it was estimated as 120 V in this study. The lowest
temperature at which plasma forms is ?75°C. We have observed as
as 80 times more hydrogen generated by plasma electrolysis than by
electrolysis at 300 V.
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Part 1, No. 10, 15 October 2000
Production of Heat during Plasma Electrolysis
Tadahiko Mizuno, Tadayoshi Ohmori (1), Tadashi
and Akito Takahashi (2)
( Division of Quantum Energy Engineering, Research Group of
System Engineering, Laboratory of Nuclear Material System, Graduate
of Engineering, Hokkaido University, Kita 13 nishi 8, Kita-ku, Sapporo
060-8628, Japan )
1 Catalysis Research Center, Section of Interfacial Energy
Hokkaido University, Kita 11 nishi10, Kita-ku, Sapporo 060, Japan
2 Department of Nuclear Engineering, Graduate School of Engineering,
Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871, Japan
Abstract: Plasma was formed on the surface of an
in a liquid solution when metal cathodes underwent high-voltage
A real-time heat calibration system was designed for detecting the
of heat generated during plasma electrolysis. The measured heat
the input power substantially, and in some cases 200% of the input
The heat generation process depended on the conditions for
There was no excess heat at the beginning of plasma electrolysis.
after plasma electrolysis for a long time, a large amount of heat was
The reproducibility would be 100% if all factors such as temperature,
and duration were optimized. Based on the heat and the products, we
that some unique reaction occurs on the cathode surface. This reaction
may not occur at energy levels available during electrochemical
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Citing Article(s) :
1. Jpn. J. Appl. Phys. Vol. 40 (2001) L989-L991 : Neutron
from a Palladium Electrode by Alternate Absorption Treatment of
and Hydrogen; Tadahiko Mizuno, Tadashi Akimoto, Tadayoshi Ohmori,
Akito Takahashi, Hiroshi Yamada and Hiroo Numata
METHOD AND APPARATUS FOR GENERATING HYDROGEN GAS
[ PDF ]
( 2004-02-26 )
Applicant: MIZUNO TADAHIKO; ARAKI MASAO
Classification: - international: C01B3/04; C25B1/04;
C25B15/02; C01B3/00; C25B1/00; C25B11/00; C25B15/00; (IPC1-7):
C01B3/04; C25B11/02; C25B15/02
Abstract --- PROBLEM TO BE SOLVED: To provide a
for generating a hydrogen gas with a high efficiency by continuously
directly pyrolyzing water with a satisfactory controllability.
This gas-generating method comprises a step of accommodating an aqueous
solution of an acid, an alkali or a metal salt in a reaction vessel,
heating it to 70[deg.]C or higher but less than 100[deg.]C, a step of
a voltage of 100-2,000 V to the above heated solution with pulse widths
of 0.1-10 s and pulse intervals of 0.01-5 s to generate plasma, and a
of electrolyzing the above aqueous solution with the above plasma.
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