  We report a gas eruption phenomenon caused by electrolysis of liquid Ga-In
alloy in an electrolyte, especially NaOH solution. A volcanic eruption-like
blowout of gas occurred from the orifice on the alloy surface. In addition to
gas plume, large gas bubbles were also generated and the total gas yield
increased as In ratio was increased. It is found that destructiveness of the
passivation layer on the Ga-In alloy is critical to gas generation. The
mechanism of gas eruption can be ascribed to a galvanic interaction happens
owing to passivation film and alloy with different activity connected as
electrode in electrolyte. Further investigation demonstrated that the lattice
of the film expands because of the incorporation of indium, which brings about
the decrease in band gap and finally enhances more gas generation. These
findings regain the basic understanding of room temperature liquid metal inside
electrolyte.
