Designing　high　capacity,　superior　rate,　satisfactory　cycle　stability　as　well　as　green,　low　cost,　and　earth　abundant　electrode　materials　is　critical　for　sodium　and　potassium　ion　storage.　Herein,　the　first　example　of　synthesizing　the　heterostructure　between　WVO4　and　V3Se4　embedded　in　carbon　fiber　(WVO4/V3Se4/CNFs)　as　a　high　capacity　and　stable　anode　for　sodium　(SIBs)　and　potassium-ion　batteries　(PIBs)　is　reported.　The　composite　is　skillfully　constructing　by　electrospinning　method　followed　with　heat　treatment,　with　the　assistance　of　biomass　algae　(Chlorella)　as　adsorbent　and　reactor.　Owing　to　the　unique　advantages　of　hybrid　structure　and　carbon　sheaths,　the　composite　architecture　demonstrates　high　reversible　capacity,　excellent　rate　properties,　and　long-term　cyclic　stability.　For　sodium　storage,　the　WVO4/V3Se4/CNFs　electrode　exhibits　a　high　reversible　specific　capacity　of　446　mAh　g(-1)　at　50　mA　g(-1)　after　200　cycles　as　well　as　a　promising　long　cycling　stability　with　a　high　capacity　of　137　mAh　g(-1)　at　5　A　g(-1)　even　over　25,000　cycles.　More　importantly,　it　also　delivers　high　reversible　capacity　and　good　rate　capability　for　potassium　storage.　This　work　opens　up　new　way　for　developing　satisfied　metal　oxide　anode　materials　for　SIBs　and　PIBs.　(C)　2021　Elsevier　B.V.　All　rights　reserved.