Electrode ink quality determination method, and measurement system

A method of determining a good quality of an electrode ink configured to include a plurality of catalyst supports and a plurality of ionomers, and configured to form a catalyst layer of a fuel cell,

• wherein, in an inner portion of the electrode ink, by adsorption of the ionomers around the catalyst supports, primary aggregate that does not aggregate with others of the catalyst supports is formed, while on the other hand, by aggregation of the catalyst supports themselves without the ionomers around the catalyst supports, secondary aggregate is formed,
• the method of determining the good quality of the electrode ink comprising:
• detecting, by one or more pressure detection units, a hydrostatic pressure of the electrode ink that was introduced into the container;
• and
• extracting as the index a change over time of the hydrostatic pressure in a predetermined period, and estimating the state of the primary aggregate and the secondary aggregate in the electrode ink based on the change over time of the hydrostatic pressure,
• thus detecting an index correlated with an amount of the primary aggregate and an amount of the secondary aggregate within the electrode ink;
• and
• based on the detected index, estimating a state of the primary aggregate and the secondary aggregate within the electrode ink, and as the primary aggregate becomes more plentifully contained within the electrode ink relative to the secondary aggregate, the more it is determined that the electrode ink is a good quality product,
• wherein the index approximately indicates a difference between a sedimentation speed of the primary aggregate and a sedimentation speed of the secondary aggregate in the static state of the electrode ink.