Instead of using electricity, PEC uses energy directly from the sun to produce hydrogen, and thus leaves other renewable electricity sources available to power other things that are more efficient. This makes it one of the most promising and exciting ways to produce hydrogen.
The efficiency of the PEC process has been measured by different laboratories and has often varied greatly due to a lack of standardized methods. To provide confidence in comparing results obtained from different sites and groups, researchers have published a best-practices guide inThe publication provides guidance for the PEC community as researchers continue to improve the technology.
“The motivation for this protocol paper was both to serve as a guide for researchers just entering the field as well as describing subtle technique tips for more experienced scientists,” said Francesca Toma, a materials staff scientist at Berkeley Lab and a co-author of the journal article. “We leveraged the unique strengths of two national labs that together span the basic to applied science realms.
The US Department of Energy’s Hydrogen and Fuel Cell Technologies Office has set 25% as the target for STH through PEC water-splitting, although preliminary cost analysis suggests that hydrogen could be achieved at a lower price with lower efficiencies. Photoelectrodes have demonstrated efficiencies from 10% to 20%.
,” delves into the topic of highly efficient and stable unassisted PEC water-splitting. In the paper, achieving this feat is referred to as the “Holy Grail” in clean and renewable fuel generation. A framework for conducting long-term stability experiments is described with goals of obtaining ultra high stability and efficiency greater than 15%.Having a consistent way to measure efficiency in PEC processes helps drive further improvement that the industry can trust in the future.
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