Solar Energy That Rebuilds Itself

Wednesday, September 8, 2010 @ 07:09 PM gHale

Plants are good at doing what man has had a hard time doing for decades: Reliably converting sunlight into stored energy.
That may soon change.
Sunlight leads to a gradual degradation of systems developed to harness it. But plants have adopted a strategy to address this issue: They constantly break down their light-capturing molecules and reassemble them from scratch, so the basic structures that capture the sun’s energy are, in effect, always brand new.
A team from MIT created a set of self-assembling molecules that can turn sunlight into electricity; the molecules can repeatedly break down and then reassembled quickly, just by adding or removing an additional solution.

A closeup of the test cell the team built to measure the properties of the self-assembling photosynthetic system.

A closeup of the test cell the team built to measure the properties of the self-assembling photosynthetic system.

The idea first occurred to Michael Strano, the Charles and Hilda Roddey Associate Professor of Chemical Engineering at MIT, when he was reading about plant biology.
“I was really impressed by how plant cells have this extremely efficient repair mechanism,” he said. In full summer sunlight, “a leaf on a tree is recycling its proteins about every 45 minutes, even though you might think of it as a static photocell.”
One of Strano’s long-term research goals has been to find ways to imitate principles found in nature using nanocomponents. In the case of the molecules used for photosynthesis in plants, the reactive form of oxygen produced by sunlight causes the proteins to fail in a very precise way. As Strano describes it, the oxygen “unsnaps a tether that keeps the protein together,” but the same proteins quickly reassemble to restart the process.
This action all takes place inside tiny capsules called chloroplasts that reside inside every plant cell — and which is where photosynthesis happens. The chloroplast is “an amazing machine,” Strano said. “They are remarkable engines that consume carbon dioxide and use light to produce glucose,” a chemical that provides energy for metabolism.
To imitate that process, Strano and his team, supported by grants from the MIT Energy Initiative and the Department of Energy, produced synthetic molecules called phospholipids that form discs; these discs provide structural support for other molecules that actually respond to light, in structures called reaction centers, which release electrons when struck by particles of light. The discs, carrying the reaction centers, are in a solution where they attach themselves spontaneously to carbon nanotubes — wire-like hollow tubes of carbon atoms that are a few billionths of a meter thick yet stronger than steel and capable of conducting electricity a thousand times better than copper. The nanotubes hold the phospholipid discs in a uniform alignment so the reaction centers can get exposure to sunlight at once, and they also act as wires to collect and channel the flow of electrons knocked loose by the reactive molecules.
The system Strano’s team produced consists of seven different compounds, including the carbon nanotubes, the phospholipids, and the proteins that make up the reaction centers, which under the right conditions spontaneously assemble themselves into a light-harvesting structure that produces an electric current. Strano said he believes this sets a record for the complexity of a self-assembling system. When a surfactant — similar in principle to the chemicals BP has sprayed into the Gulf of Mexico to break apart oil — adds into the mix, the seven components all come apart and form a soupy solution. Then, when the researchers remove the surfactant by pushing the solution through a membrane, the compounds spontaneously assemble once again into a perfectly formed, rejuvenated photocell.
“We’re basically imitating tricks that nature has discovered over millions of years” — in particular, “reversibility, the ability to break apart and reassemble,” Strano said. The team came up with the system based on a theoretical analysis, but then decided to build a prototype cell to test it out. They ran the cell through repeated cycles of assembly and disassembly over a 14-hour period, with no loss of efficiency.
Strano said in devising novel systems for generating electricity from light, researchers don’t often study how the systems change over time. For conventional silicon-based photovoltaic cells, there is little degradation, but with new systems under development — either for lower cost, higher efficiency, flexibility or other improved characteristics — the degradation can be very significant. “Often people see, over 60 hours, the efficiency falling to 10 percent of what you initially saw,” he said.
The individual reactions of these new molecular structures in converting sunlight are about 40 percent efficient, or about double the efficiency of today’s best commercial solar cells. Theoretically, the efficiency of the structures could be close to 100 percent, he said. But in the initial work, the concentration of the structures in the solution was low, so the overall efficiency of the device — the amount of electricity produced for a given surface area — was very low. They are working now to find ways to greatly increase the concentration.

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