Artificial leaf jumps developmental hurdle

February 17, 2014

​In a recent early online edition of Nature Chemistry, ASU scientists, along with colleagues at Argonne National Laboratory, have reported advances toward perfecting a functional artificial leaf.

Designing an artificial leaf that uses solar energy to convert water cheaply and efficiently into hydrogen and oxygen is one of the goals of BISfuel – the Energy Frontier Research Center, funded by the Department of Energy, in the Department of Chemistry and Biochemistry at Arizona State University. Bio-inpired solar fuel production Download Full Image

Hydrogen is an important fuel in itself and serves as an indispensible reagent for the production of light hydrocarbon fuels from heavy petroleum feed stocks. Society requires a renewable source of fuel that is widely distributed, abundant, inexpensive and environmentally clean.

Society needs cheap hydrogen.

“Initially, our artificial leaf did not work very well, and our diagnostic studies on why indicated that a step where a fast chemical reaction had to interact with a slow chemical reaction was not efficient,” said ASU chemistry professor Thomas Moore. “The fast one is the step where light energy is converted to chemical energy, and the slow one is the step where the chemical energy is used to convert water into its elements viz. hydrogen and oxygen.”

The researchers took a closer look at how nature had overcome a related problem in the part of the photosynthetic process where water is oxidized to yield oxygen.

“We looked in detail and found that nature had used an intermediate step,” said Moore. “This intermediate step involved a relay for electrons in which one half of the relay interacted with the fast step in an optimal way to satisfy it, and the other half of the relay then had time to do the slow step of water oxidation in an efficient way.”

They then designed an artificial relay based on the natural one and were rewarded with a major improvement.

Seeking to understand what they had achieved, the team then looked in detail at the atomic level to figure out how this might work. They used X-ray crystallography and optical and magnetic resonance spectroscopy techniques to determine the local electromagnetic environment of the electrons and protons participating in the relay, and with the help of theory (proton coupled electron transfer mechanism), identified a unique structural feature of the relay. This was an unusually short bond between a hydrogen atom and a nitrogen atom that facilitates the correct working of the relay.

They also found subtle magnetic features of the electronic structure of the artificial relay that mirrored those found in the natural system.

Not only has the artificial system been improved, but the team understands better how the natural system works. This will be important as scientists develop the artificial leaf approach to sustainably harnessing the solar energy needed to provide the food, fuel and fiber that human needs are increasingly demanding.

ASU chemistry professors involved in this specific project include Thomas Moore, Devens Gust, Ana Moore and Vladimiro Mujica. The department is a unit of the College of Liberal Arts and Sciences. Key collaborators in this work are Oleg Poluektov and Tijana Rajh from Argonne National Laboratory.

This work would not have been possible without the participation of many scientists driven by a common goal and coordinated by a program such as the Energy Frontier Research Center to bring the right combination of high-level skills to the research table.

The Department of Chemisry and Biocehmistry is an academic unit in ASU's College of Liberal Arts and Sciences.

Jenny Green

Clinical associate professor, School of Molecular Sciences


Events at ASU this week

February 17, 2014

What’s happening at Arizona State University this week? A lot!

We’ve rounded up the top events taking place Feb. 18-22, so don't miss out! ASU students Download Full Image

Tuesday, Feb. 18
School of Art Student Artfest

3-6 p.m., Neeb Plaza, Tempe campus 
Student art clubs representing metal, wood, fibers, painting, printmaking, drawing, ceramics, photography and sculpture will give demonstrations and exhibit new work. You’ll have the chance to buy art and make some of your own, as well as score free samples from local art vendors, art swag and original work giveaways made by art students.

Wednesday, Feb. 19
Career Fashion Show
5-6:30 p.m., Downtown Phoenix 
Learn how to dress to impress your prospective employer, whether you are entering your career field for an internship or full-time employment. Enjoy fashion demonstrations, delicious food and high-end prizes from businesses like Downtown Salon Phoenix, Urban Outfitters and more. Just don’t forget to bring your Sun Card.

Take the Lead Launch

6 p.m., ASU Gammage 
Sheryl Sandberg, COO of Facebook and author of "Lean In," headlines at the Take The Lead launch of a new initiative to prepare, develop, inspire and propel women to take their fair share of leadership positions by 2025. General Admission $15, or FREE to students with a valid college or high school ID.  

Thursday, Feb. 20
How to Find an Internship
4-5 p.m., Career Services, Tempe campus 
Using only the Internet to find an internship can be overwhelming, frustrating and, depending on your career interests, ineffective. Attend this workshop to discover how to use a variety of search tools and resources to help you obtain an internship.

Friday, Feb. 21
Night of the Open Door
5-8 p.m., Polytechnic campus 
A signature event of the AZSciTech Festival, Night of the Open Door offers more than 100-plus hands-on activities, performances, tours, games and museums in a carnival-like, family-friendly atmosphere. Tour spaces, meet professors and connect with student clubs. To view events on all campuses, please visit the Events Calendar.

ASU Night at the Suns
Watch as the Phoenix Suns take on the San Antonio Spurs. Get your discounted tickets for $15 at by entering the promotional code "Sparky." The first 50 tickets are FREE!

Saturday, Feb. 22
Dance Marathon
2 p.m-2 a.m., Sun Devil Fitness Complex, Downtown campus 
Get out and dance for a good cause! The ASU Dance Marathon is an all-night dance party to raise money for the Phoenix Children’s Hospital.