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Secrets of the first practical artificial leaf

Date:
May 9, 2012
Source:
American Chemical Society
Summary:
A detailed description of development of the first practical artificial leaf -- a milestone in the drive for sustainable energy that mimics the process, photosynthesis, that green plants use to convert water and sunlight into energy -- has just been published. The article notes that unlike earlier devices, which used costly ingredients, the new device is made from inexpensive materials and employs low-cost engineering and manufacturing processes.

The new self-contained units are inexpensive and attractive for making fuel for electricity in remote places and the developing world.
Credit: ACS

A detailed description of development of the first practical artificial leaf -- a milestone in the drive for sustainable energy that mimics the process, photosynthesis, that green plants use to convert water and sunlight into energy -- appears in the ACS journal Accounts of Chemical Research. The article notes that unlike earlier devices, which used costly ingredients, the new device is made from inexpensive materials and employs low-cost engineering and manufacturing processes.

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Daniel G. Nocera points out that the artificial leaf responds to the vision of a famous Italian chemist who, in 1912, predicted that scientists one day would uncover the "guarded secret of plants." The most important of those, Nocera says, is the process that splits water into hydrogen and oxygen. The artificial leaf has a sunlight collector sandwiched between two films that generate oxygen and hydrogen gas. When dropped into a jar of water in the sunlight, it bubbles away, releasing hydrogen that can be used in fuel cells to make electricity. These self-contained units are attractive for making fuel for electricity in remote places and the developing world, but designs demonstrated thus far rely on metals like platinum and manufacturing processes that make them cost-prohibitive.

To make these devices more widely available, Nocera replaced the platinum catalyst that produces hydrogen gas with a less-expensive nickel-molybdenum-zinc compound. On the other side of the leaf, a cobalt film generates oxygen gas. Nocera notes that all of these materials are abundant on Earth, unlike the rare and expensive platinum, noble metal oxides and semiconducting materials others have used. "Considering that it is the 6 billion nonlegacy users that are driving the enormous increase in energy demand by midcentury, a research target of delivering solar energy to the poor with discoveries such as the artificial leaf provides global society its most direct path to a sustainable energy future," he says.

The author acknowledges support from the National Science Foundation and the Chesonis Family Foundation.


Story Source:

The above story is based on materials provided by American Chemical Society. Note: Materials may be edited for content and length.


Journal Reference:

  1. Daniel G. Nocera. The Artificial Leaf. Accounts of Chemical Research, 2012; 120404113447002 DOI: 10.1021/ar2003013

Cite This Page:

American Chemical Society. "Secrets of the first practical artificial leaf." ScienceDaily. ScienceDaily, 9 May 2012. <www.sciencedaily.com/releases/2012/05/120509123900.htm>.
American Chemical Society. (2012, May 9). Secrets of the first practical artificial leaf. ScienceDaily. Retrieved November 20, 2014 from www.sciencedaily.com/releases/2012/05/120509123900.htm
American Chemical Society. "Secrets of the first practical artificial leaf." ScienceDaily. www.sciencedaily.com/releases/2012/05/120509123900.htm (accessed November 20, 2014).

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