Gamry provides several systems for fuel cell development and testing. We also include tools designed to improve data analysis and workup.
Many Gamry systems can cover the various needs in fuel cell research and materials development. All of our potentiostats are electrically isolated from earth ground, making them ideal for studying grounded cells. Being electrically isolated also means that they can work in conjunction with an electronic load. Our systems have been proven time and time again, by you the user, to provide the highest electrical isolation in the industry.
Gamry has been at the forefront of affordable, high performance EIS measurements for more than 15 years. We have also been making floating instruments since our inception. We understand how difficult these measurements can be and design our instruments and provide you with application notes to help users make them as well as possible.
When it comes to fuel cells, most of the basic electrochemical measurements are fairly simple. The exception to this is getting good EIS data on working cells/stacks, particularly on systems that operate at high currents. In the “Gamry Systems” section, we detail several ways to perform these tests. One involves a shared path for AC and DC current and the other involves isolated AC and DC loops that sum up across the fuel cell. In both of these tests, but particularly the first, it may be advisable to use a shunt.
A shunt is a low but known impedance device that is sometimes used for measuring high currents. Placing a 0.1 mΩ shunt after a fuel cell which operates at 100 A will lead to a 10 mV drop, which can be precisely (and accurately) measured. It is much easier to measure 10 mV with precision than it is to measure 100 A. The addition of a shunt to a fuel cell/electronic load path allows a precise measure of the current going through the system. When selecting a shunt to use, try to target one that will lead to a total voltage drop of ~10 mV when the fuel cell is at maximum operating current.
Many Gamry systems can meet the needs of a fuel cell researcher. The Interface 1000E, with currents up to 1 A, is a great system for studying materials or smaller setups. The Interface 5000E is a great single cell system that can provide up to 5A @ 6 V. Our Reference 3000/3000AE along with the Reference 30K Booster for extra current is an ideal solution for fuel cells that operate up to 30 A total current, and up to 20 V in the stack. It is capable of running both DC and AC testing.
Both the Interface line and Reference line of instruments can be configured into bipotentiostat setups for running RRDE experiments. The Reference 3000AE is ideal when testing fuel cell stacks, because it allows the simultaneous measurement of up to 8 individual cells within the stack, whether running a polarization curve or doing impedance spectroscopy. The Interface 5000 is capable of monitoring both half cell voltages in addition to the full cell voltage when an embedded reference electrode is used.