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New water splitting catalyst could make it easier to generate solar fuel

Date:
January 23, 2019
Source:
Binghamton University
Summary:
Water splitting, the process of harvesting solar energy to generate energy-dense fuels, could be simplified thanks to new research.
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Water splitting, the process of harvesting solar energy to generate energy-dense fuels, could be simplified thanks to new research including faculty at Binghamton University, State University of New York.

"The key idea is to generate a solar fuel: hydrogen gas, which can be burnt to release energy on demand without releasing carbon dioxide," said Binghamton University Associate Professor of Physics Louis Piper. "For water splitting, we use visible light to generate photo-excited negative electrons and positive holes that are then separated in order to catalyze water into oxygen and hydrogen gases. Storing gases is more straightforward (and cheaper) than employing battery set-ups, so this approach has the benefit of clean energy harvesting and storage."

A research team including Piper figured out how "doping" (or adding metal ions) into vanadium pentoxide (M-V2O5) nanowires raises the highest filled energy levels for more efficient hole transfer from the quantum dots to nanowires i.e. separation of the photo-excited electrons and holes.

"If you don't dope, then there is a buildup of positive holes that corrode the quantum dots (referred to as photo-corrosion)," said Piper. "Using computation and chemical intuition, we predicted doping with Sn2+ ions would result in excellent energy alignment and efficient charge separation. We saw a ten-fold increase in the amount of solar-harvested hydrogen we obtained."

The researchers are now working with their collaborators at University of Buffalo and Texas A&M University to enhance the hydrogen gas evolution by decorating the quantum dots with platinum.

"We expect platinum to improve things by acting as a catalytic site for the electrons, but our ultimate goal is to find less costly alternatives to decorate with," said Piper.

Researchers at Diamond Light Source and Brookhaven National Laboratory also contributed to this paper.


Story Source:

Materials provided by Binghamton University. Note: Content may be edited for style and length.


Journal Reference:

  1. Justin L. Andrews, Junsang Cho, Linda Wangoh, Nuwanthi Suwandaratne, Aaron Sheng, Saurabh Chauhan, Kelly Nieto, Alec Mohr, Karthika J. Kadassery, Melissa R. Popeil, Pardeep K. Thakur, Matthew Sfeir, David C. Lacy, Tien-Lin Lee, Peihong Zhang, David F. Watson, Louis F. J. Piper, Sarbajit Banerjee. Hole Extraction by Design in Photocatalytic Architectures Interfacing CdSe Quantum Dots with Topochemically Stabilized Tin Vanadium Oxide. Journal of the American Chemical Society, 2018; 140 (49): 17163 DOI: 10.1021/jacs.8b09924

Cite This Page:

Binghamton University. "New water splitting catalyst could make it easier to generate solar fuel." ScienceDaily. ScienceDaily, 23 January 2019. <www.sciencedaily.com/releases/2019/01/190123131708.htm>.
Binghamton University. (2019, January 23). New water splitting catalyst could make it easier to generate solar fuel. ScienceDaily. Retrieved July 18, 2024 from www.sciencedaily.com/releases/2019/01/190123131708.htm
Binghamton University. "New water splitting catalyst could make it easier to generate solar fuel." ScienceDaily. www.sciencedaily.com/releases/2019/01/190123131708.htm (accessed July 18, 2024).

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