Chemists have collected cheap cell solar

American
Chinese chemists have developed a
new solar
electrolyzer — a device for producing
hydrogen from water with solar
energy. Scientists
deliberately refused to use
expensive materials: the basis of the cell, the catalysts of the nanorods of cobalt oxide and
perovskite solar cell, which are enclosed in a packaging film.
Efficiency
conversion
solar energy to hydrogen — 6,7
percent.
Results
research published
in the journal ACS
Nano.

One
of the main disadvantages of solar
elements
— the intermittent nature of the work.
The power issued by the solar
power plant depends on the season,
the time of day and weather. So
for effective use of solar
energy need to learn to stock up
the energy in the daytime to
then use it, for example at night.

The problem can be solved by combining two technologies: photovoltaics
and electrocatalytic
the production of hydrogen.
In
this electricity device, which
developed a solar panel immediately
is used to separate hydrogen from water by
electrolysis. Further, the hydrogen can be used for
generate electricity in the dark,
and
also to store and transport.

The energy in this device are converted twice:
first
energy
incident photons goes into
electrical energy,
and then into the energy of chemical bonds
molecules
hydrogen.
Losses occur at both stages,
therefore, the effectiveness of such
devices yet
not very high: the best show
the effectiveness of the 16-19
percent.

Usually such devices
made from silicon solar
elements
and
as catalysts use
platinum group metals —
platinum, iridium and ruthenium, and
their compounds.
All
these materials are quite expensive, which
difficult to further scale
solar-hydrogen systems.

Chemists under the leadership of
Jun Lou (Jun
Lou) of
University
Rice
for the first time
developed solar
the electrolyzer,
where
not used
expensive materials: solar
the item is made from lead-galogenidov
perovskite CH3NH3PbI3,
and the catalyst for
electrolysis of water —
of nanorods
the cobalt oxide.

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