Experimental
2.1 Physical characterization methods
Morphology of Pt/C catalysts ...
The revised title is:
Experiment
2.1 Physical characterization methods
Morphology of Pt/C catalysts ...
The explanation is that experimental is an adjective and would be used in the following: "A car with a new experimental fuel system is being tested at ..."
Experiment is a noun as in: "We are doing an experiment to see if we can improve rice yields ..."
Until next time.