Some months ago I was playing with 60% H202$60\,\%$ $\ce{H2O2}$ and unknowingly I used a silver spoon to transfer the liquid from a container, and the peroxide immediately started bubbling (it did look and sound like violent boiling) around the spoon.
Are there solids or thick liquids available to an amateur that are even more potent in catalysing the decomposition of H2O2?$\ce{H2O2}?$