Phosphoric acid fuel cells were the first modern fuel cell types to be used commercially and have found application as both stationary and automotive power sources. Their high efficiency as combined power and heat generators make them attractive targets for further development.
In the cell, phosphoric acid functions as the medium (or "electrolyte") that transports protons produced in the reaction that decomposes the fuel across the cell. Indeed, phosphoric acid has the highest proton conductivity of any known substance, but what makes it work so well as a proton conductor has remained a mystery.
Efficient proton transport across a fuel cell is just one of several technical challenges that must be tackled before this technology can be applied on a massive scale. The key to this problem is the identification of a suitable electrolyte material. Hydrated polymers are often employed, but these must operate at temperatures below the boiling point of water, which limits their utility. Phosphoric acid fuel cells and other phosphate-based cells, by contrast, can be operated at substantially higher temperatures.
Chemists have sought a molecular level understanding of proton conduction phenomena for more than 200 years. The earliest studies concerned water and can be traced back to a landmark paper in 1806 by the German chemist Theodor von Grotthuss. In this paper, Grotthuss suggested that excess protons in aqueous acids are not themselves transported, but rather it is the chemical bonding pattern they create that is transported via a series of short hops of protons between neighboring water molecules. Such hops occur through the hydrogen bonds that connect water molecules into a network.
One can liken this process to an old-time fire brigade in which each fireman in a long line holds a bucket of water in his left hand. A fireman at the end of the line receives a new water bucket in his right hand, so in order to make the transport of water down the line as efficient as possible, he passes the bucket in his left hand to the right hand of his neighbor. The neighbor, who now holds buckets in his left and right hands, passes the bucket in his left hand to the right hand of the next fireman in the line, and the process continues like this until the person at the opposite end of the line holds two buckets. Overall, water is transported down the line, but it is not the same bucket being passed in each transfer.
Of course, the transport of excess protons in water is not this simple—it involves complex rearrangements of the hydrogen bonds at each transfer step to accommodate the diffusing chemical bonding pattern. Because of this, proton transport in water appears to be a step-wise process. Water faces other limitations—it cannot function as an intrinsic proton conductor but must have protons added to it to create aqueous acid solutions before any noticeable proton transport occurs.
The Nature Chemistry study contrasted proton conduction in phosphoric acid with excess protons in aqueous solutions. In their work, the researchers carried out a type of "computerized experiment" or "simulation" in which no prior knowledge of the chemical processes is required. The only input is the atomic composition of phosphoric acid (hydrogen, oxygen, and phosphorus). Based on this input, the atoms' motion in time is determined from the fundamental laws of physics. In this way, the proton conduction mechanism can be allowed to unfold and be discovered directly from the simulation output.
Their results showed that proton motion in phosphoric acid is a highly cooperative process that can involve as many as five phosphoric acid molecules at a time serving as a kind of temporary "proton wire" or chain. The basic findings are:In contrast to the step-wise mechanism that operates in water, phosphoric acid transfers protons in a more "streamlined" fashion, in which protons move in a concerted manner along one of these temporary wires.
Eventually, it becomes energetically unfavourable for this wire to sustain this proton motion. Hence, the system then seeks to resolve this unfavourable condition by breaking one of the hydrogen bonds in this temporary wire and forming a new wire arrangement with other nearby phosphoric acid molecules. New wire arrangements persist until they can no longer sustain the proton motion in them, at which point they break and new wires are formed. This process of forming and breaking the short wires allows for a steady proton current and overall high proton conductivity.
Although phosphoric acid has its advantages in fuel cell applications, phosphoric acid fuel cells still are not as powerful as other types of cells and, as pure power sources, are not as efficient. However, an understanding of the basic proton transport mechanism can help improve the design of such cells or suggest other phosphate based materials that could serve as the proton carrier.
The study's authors were: Mark Tuckerman, a professor in NYU's Department of Chemistry as well as Linas Vilèiauskas, Gabriel Bester, and Klaus-Dieter Kreuer from the Max Planck Institute and Stephen J. Paddison of the University of Tennessee, Knoxville.
James Devitt | EurekAlert!
Overlooked molecular machine in cell nucleus may hold key to treating aggressive leukemia
23.04.2019 | Cincinnati Children's Hospital Medical Center
Bacteria use their enemy -- phage -- for 'self-recognition'
23.04.2019 | Chinese Academy of Sciences Headquarters
Researchers led by Francesca Ferlaino from the University of Innsbruck and the Austrian Academy of Sciences report in Physical Review X on the observation of supersolid behavior in dipolar quantum gases of erbium and dysprosium. In the dysprosium gas these properties are unprecedentedly long-lived. This sets the stage for future investigations into the nature of this exotic phase of matter.
Supersolidity is a paradoxical state where the matter is both crystallized and superfluid. Predicted 50 years ago, such a counter-intuitive phase, featuring...
A stellar flare 10 times more powerful than anything seen on our sun has burst from an ultracool star almost the same size as Jupiter
A localization phenomenon boosts the accuracy of solving quantum many-body problems with quantum computers which are otherwise challenging for conventional computers. This brings such digital quantum simulation within reach on quantum devices available today.
Quantum computers promise to solve certain computational problems exponentially faster than any classical machine. “A particularly promising application is the...
The technology could revolutionize how information travels through data centers and artificial intelligence networks
Engineers at the University of California, Berkeley have built a new photonic switch that can control the direction of light passing through optical fibers...
Physicists observe how electron-hole pairs drift apart at ultrafast speed, but still remain strongly bound.
Modern electronics relies on ultrafast charge motion on ever shorter length scales. Physicists from Regensburg and Gothenburg have now succeeded in resolving a...
17.04.2019 | Event News
15.04.2019 | Event News
09.04.2019 | Event News
23.04.2019 | Information Technology
23.04.2019 | Earth Sciences
23.04.2019 | Life Sciences