The effects of thickness extension mode resonance oscillation (TERO) of bulk acoustic waves on ethanol decomposition over a 100 nm Ag film deposited on a negatively polarized z-cut LiNbO3 Crystal ((-)Ag) were studied, and the results were compared with those obtained previously for Ag deposited on a positively polarized z-cut LiNbO3 crystal ((+)Ag). In ethylene and acetaldehyde production, the TERO for (-)Ag increased the selective for ethylene production, but the TERO effects on activity and selectivity enhancement were smaller compared to those for (+)Ag. Laser Doppler measurements showed that lattice displacements caused by the TERO were similar between (-)Ag and (+)Ag. In photoelectron emission spectra of (-)Ag, the TERO caused the positive shifts of the threshold energy for electron emission associated with the work function of the Ag surface. The work function increases were considerably smaller for (-)Ag than for (+)Ag, which is considered to be responsible for differences in the catalyst activation between (-)Ag and (+)Ag. A mechanism of different TERO effects between (-)Ag and (+)Ag is discussed.