ASU Center for Bio-Inspired Solar Fuel
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- Our objective is to adapt
the fundamental principles of natural photosynthesis to the man-made
production of hydrogen or other fuels from sunlight
A multidisciplinary team will research artificial photosynthetic antennas
and reaction centers that absorb light efficiently and convert it to
electrochemical energy, a water oxidation catalyst based on that found in
photosynthesis and assembled in a way that mimics the process used by
nature,and an electron accumulator and proton reduction catalyst based on
natural hydrogenase enzymes. The antennas and reaction centers will be
designed using the techniques of organic chemistry. The catalysts will be
developed using peptide engineering methods. These components will be
structurally organized using concepts from materials science, nanotechnology
and nucleic acid engineering.
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Mission
- Our mission is to construct a complete system for
solar-powered production of fuels such as hydrogen via water splitting.
Design principles will be drawn from the fundamental concepts that underlie
photosynthetic energy conversion.
A major challenge facing humanity is developing a renewable source of energy
to replace our reliance on fossil fuels. The ideal source will be abundant,
inexpensive, environmentally clean, and widely distributed geographically.
Energy from the sun meets these criteria. Unfortunately, practical, cost
effective technologies for conversion of sunlight directly into useful fuels
do not exist, and new basic science is required. A blueprint for storage of
solar energy in fuels does exist, however, in photosynthesis. Indeed, all of
the fossil-fuel-based energy we consume today derives from sunlight that was
harvested by photosynthetic organisms.
Recognizing the need for new science, the DOE established the ASU Center for
Bio-Inspired Solar Fuel Production in 2009. The Center involves 11 faculty
from the Department of Chemistry and Biochemistry and is housed within the
ASU Center for Bioenergy and Photosynthesis. The Solar Fuel Center consists
of faculty, research associates, graduate students and undergraduate
researchers dedicated to solving the renewable energy problem.
Center Objective
Our objective is to adapt the fundamental principles of natural
photosynthesis to the man-made production of hydrogen or other fuels from
sunlight
A multidisciplinary team will research artificial photosynthetic
antennas and reaction centers that absorb light efficiently and convert it
to electrochemical energy, a water oxidation catalyst based on that found in
photosynthesis and assembled in a way that mimics the process used by
nature,and an electron accumulator and proton reduction catalyst based on
natural hydrogenase enzymes. The antennas and reaction centers will be
designed using the techniques of organic chemistry. The catalysts will be
developed using peptide engineering methods. These components will be
structurally organized using concepts from materials science, nanotechnology
and nucleic acid engineering. The Science
- Water oxidation complexes will be based on a
unique, self-assembling, engineered DNA nanostructure that organizes short
synthetic peptides arranged in a manner analogous to the natural
oxygen-evolving complex. These peptides will be used to construct a
metal-ion-based catalytic site similar to the natural one, using assembly
methods found in photosynthesis. In a second approach, peptide-based
water-soluble analogs of the natural photosynthetic oxygen-evolving complex
will be sought. The DOE ALS in Berkeley will be used for X-ray (as
necessary), XAFS and XANES characterization of the artificial water
oxidation (and proton reduction) catalysts.
Hydrogen production catalysts will be based on natural
hydrogenase enzymes. Iron-containing catalytic sites and iron-sulfur sites
for storing reduction equivalents will be organized into functional
catalysts using metal nanoparticles and linked to transparent electrodes.
New transparent, nanostructured, high-surface-area conducting metal oxide
materials will be constructed to serve as functional frameworks for
organizing the various components of the system, separating mutually
reactive intermediates, and facilitating electrical communication among
components.
A major challenge is the integration of the various components mentioned
above into a functional system that is competent to carry out water
splitting as a unit. This will require careful attention both to the
thermodynamic and kinetic properties of the catalysts and charge-separation
units and to the transport of redox equivalents and materials among the
various units of the complex. Thus, the research has a strong systems
engineering component. Two photosystems, à la photosynthesis, will likely be
necessary to achieve useful efficiencies. Initially, metallic connections
between some subsystems will be used in order to permit testing of
components electrochemically and application of external emf as necessary.
Based on the performance of natural photosynthesis, the synthetic system has
the potential to produce fuel efficiently from sunlight and water, to be
inexpensive, to use earth-abundant elements, and to be a practical solution
to humanity’s energy problems. Realizing this potential is a significant
fundamental and applied scientific challenge.
While pursuing this ambitious goal, the Center will uncover basic scientific
knowledge that will point the way to new catalysts for water splitting and
fuel cells, new materials for solar photovoltaics of various kinds, new ways
to use DNA and peptides for preparation of artificial enzymes for biomedical
and other technological applications, and new fundamental ways of
understanding and manipulating matter that will have applications in many
different areas of technology. It may also help identify ways to modify
natural photosynthesis in plants so that it can better fill humanity’s
needs.