One-dimensional　(1D)　tubular　Ag/MnOx　nanocomposites　were　synthesized　by　the　solvothermal　method　via　the　Kirkendall　effect　between　potassium　permanganate　(KMnO4)　and　Ag　nanowire　templates.　The　morphology　and　electrochemical　performance　of　Ag/MnOx　composites　were　tuned　by　varying　the　pH　levels.　Tubular　MnOx　nanosheets　with　ultrafine　Ag　nanoparticles　were　formed　in　an　acidic　environment　(pH　0.76),　whereas　the　Ag　nanoparticles　entrapped　in　amorphous　MnO2　nanotubes　were　prepared　in　a　neutral　environment　(pH　7.00).　Based　on　a　series　of　volume-dependent　experiments,　it　was　confirmed　that　the　Kirkendall　effect　was　involved　in　the　formation　of　these　morphologies.　When　tested　as　an　electrode　for　supercapacitors,　the　hierarchical　tubular　Ag/MnOx　nanosheet　composites　prepared　in　an　acidic　environment　exhibited　an　optimized　electrochemical　performance,　with　specific　capacitance　of　180　F　g(-1)　at　current　density　of　0.1　A　g(-1),　and　still　maintained　80%　of　initial　capacity　after　1000　cycles　at　current　density　of　1　A　g(-1).　The　proposed　synthetic　mechanism　and　the　developed　synthetic　strategy　may　provide　design　guidelines　for　synthesizing　other　hierarchical　transition　metal/transition　metal　oxide　nanocomposites.