This　paper　presents　an　experimental　study　of　the　broadband　energy　harvesting　and　dynamic　responses　of　an　L-shaped　piezoelectric　cantilever　beam.　Experimental　results　show　that　the　L-shaped　piezoelectric　beam　generates　two　optimal　voltage　peaks　when　the　horizontal　beam　size　is　similar　to　the　vertical　beam　size.　Several　optimized　L-shaped　piezoelectric　cantilever　beam　structures　are　proposed.　Power　generation　using　the　inverted　bistable　L-shaped　beam　is　better.　It　is　observed　experimentally　that　the　inverted　bistable　L-shaped　beam　structure　shows　obvious　bistable　characteristics　and　hard　spring　characteristics.　Furthermore,　the　corresponding　relationship　between　the　bistable　phase　portrait　and　the　potential　energy　curve　is　found　in　the　experiment.　This　is　the　first　time　that　a　phase　portrait　for　stiffness　hardening　of　an　L-shaped　beam　has　been　found　experimentally.　These　results　can　be　applied　to　analysis　of　new　piezoelectric　power　generation　structures.　Graphic　abstract