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2015 ; 5
(3
): 20150014
Nephropedia Template TP
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Biosolar cells: global artificial photosynthesis needs responsive matrices with
quantum coherent kinetic control for high yield
#MMPMID26052428
Purchase RL
; de Groot HJ
Interface Focus
2015[Jun]; 5
(3
): 20150014
PMID26052428
show ga
This contribution discusses why we should consider developing artificial
photosynthesis with the tandem approach followed by the Dutch BioSolar Cells
consortium, a current operational paradigm for a global artificial photosynthesis
project. We weigh the advantages and disadvantages of a tandem converter against
other approaches, including biomass. Owing to the low density of solar energy per
unit area, artificial photosynthetic systems must operate at high efficiency to
minimize the land (or sea) area required. In particular, tandem converters are a
much better option than biomass for densely populated countries and use two
photons per electron extracted from water as the raw material into chemical
conversion to hydrogen, or carbon-based fuel when CO2 is also used. For the
average total light sum of 40 mol m(-2) d(-1) for The Netherlands, the upper
limits are many tons of hydrogen or carbon-based fuel per hectare per year. A
principal challenge is to forge materials for quantitative conversion of photons
to chemical products within the physical limitation of an internal potential of
ca 2.9 V. When going from electric charge in the tandem to hydrogen and back to
electricity, only the energy equivalent to 1.23 V can be stored in the fuel and
regained. A critical step is then to learn from nature how to use the remaining
difference of ca 1.7 V effectively by triple use of one overpotential for
preventing recombination, kinetic stabilization of catalytic intermediates and
finally generating targeted heat for the release of oxygen. Probably the only way
to achieve this is by using bioinspired responsive matrices that have
quantum-classical pathways for a coherent conversion of photons to fuels, similar
to what has been achieved by natural selection in evolution. In appendix A for
the expert, we derive a propagator that describes how catalytic reactions can
proceed coherently by a convergence of time scales of quantum electron dynamics
and classical nuclear dynamics. We propose that synergy gains by such processes
form a basis for further progress towards high efficiency and yield for a global
project on artificial photosynthesis. Finally, we look at artificial
photosynthesis research in The Netherlands and use this as an example of how an
interdisciplinary approach is beneficial to artificial photosynthesis research.
We conclude with some of the potential societal consequences of a large-scale
roll out of artificial photosynthesis.