WO3　nanorods　and　xWO3@TiO2　(WO3/TiO2　mass　ratio　(x)　=　1−5)　photocatalysts　were　synthesized　using　the　hydrothermal　and　sol-gel　methods,　respectively.　The　photocatalytic　activities　of　xWO3@TiO2　for　NH3　oxidation　first　increased　and　then　decreased　with　a　rise　in　TiO2　content.　Among　them,　the　heterostructured　3WO3@TiO2　photocatalyst　showed　the　highest　NH3　conversion　(58　%)　under　the　simulated　sunlight　irradiation,　which　was　about　two　times　higher　than　those　of　WO3　and　TiO2.　Furthermore,　the　smallest　amounts　of　by-products　(i.e.,　NO　and　NO2)　were　produced　over　3WO3@TiO2.　The　enhancement　in　photocatalytic　performance　(i.e.,　NH3　conversion　and　N2　selectivity)　of　3WO3@TiO2　was　mainly　attributed　to　the　formed　interfacial　electric　field　between　WO3　and　TiO2,　which　promoted　efficient　separation　and　transfer　of　photogenerated　charge　carriers.　Based　on　the　results　of　reactive　species　trapping　and　active　radical　detection,　photocatalytic　oxidation　of　NH3　over　3WO3@TiO2　was　governed　by　the　photogenerated　holes　and　superoxide　radicals.　This　work　combines　two　strategies　of　morphological　regulation　and　interfacial　electric　field　construction　to　simultaneously　improve　light　utilization　and　photogenerated　charge　separation　efficiency,　which　promotes　the　development　of　full-spectrum　photocatalysts　for　the　removal　of　ammonia.　©　2024　Elsevier　Ltd