Titanium　dioxide　(TiO2)　is　usually　introduced　into　dielectric　layer　of　aluminum　electrolytic　capacitor　to　enhance　capacitance　performance　via　forming　Al2O3-TiO2　composite　film.　However,　there　is　a　big　obstacle　caused　by　high　crystallization　temperature　of　TiO2　to　capacitance　enhancement.　In　present　work,　a　facile　route　was　proposed　to　synthesize　crystalline　TiO2　with　the　size　of　3-10　nm　at　room　temperature　using　lactic　acid　(LA)　and　acetylacetone　(Acac)　as　double　chelators.　After　being　introduced　into　the　surface　of　etched　aluminum　foils　as　dielectric　layer,　TiO2　boosted　the　specific　capacitance　by　about　24%　compared　to　that　without　TiO2,　and　about　11%　compared　to　that　with　TiO2　using　lactic　acid　as　only　chelator.　(C)　2015　Published　by　Elsevier　Inc.