Electrochemical quartz crystal microbalance (EQCM) can be used to study
the charge storage mechanisms of supercapacitors because of its excellent
accuracy in mass change, and a homogeneous and ultrathin sample coating
is strongly required for accurate measurement. However, it is difficult to
obtain such a coating by the frequently used methods. Here a vacuum
filtration-and-transfer (VFT) technique is reported to achieve this target. To
prove the universality of this method, six materials with different dimensions
are selected as research objects, and they are prepared into test films on
quartz by VFT method and well-used spray method for EQCM measurements,
respectively. The results show that the VFT method can eliminate the
influence caused by inhomogeneity of the films, which is beneficial for clearly
distinguishing the rigid model from the viscoelastic model. This method
helps EQCM to reflect more precise quality change as well as deformation of
the material itself. Consequently, it makes EQCM more reliable to describe
the energy storage mechanisms of various electrode materials.