BUSCADOR RECOLECTA

Supplementary SEM and AFM images, XPS characterization, Faradaic efficiency, two-electrode test, EIS, SEC data, and TXRF (PDF). Video showing the visual increase in the electrode area (MP4)., Peer reviewed

S1. Unit cells and crystal structure parameters of InSb, InAsSb, InAs, α-Sn, and β-Sn; S2. InSb–Sn morphology and EELS map; S3. FIB- or ALD-induced damage during cross-section preparation; S4. InSb–Sn: β-Sn grain formation within α-Sn shell; S5. Temperature effect on the hybrid structure; S6. InSb–Sn grown at room temperature; S7. InSb–Sn grown at sample holder temperature −50 °C; S8. InSb–Sn grown at sample holder temperature −100 °C; S9. InSb–Sn grown at sample holder temperature −150 °C; S10. Additional HRTEM micrographs of 3 nm Sn on InSb NW; S11. Defect formation and initial β-Sn nucleation in a 5 nm Sn shell on an InSb NW; S12. Additional micrographs of a 40 nm Sn shell on an InSb NW; S13. Thermal stability of the α-β-Sn/InSb heterostructure; S14. Additional SEM images of InAsSb–Sn morphology; S15. Additional structural analysis of InAsSb/Sn; S16. Structural analysis of InAs/Sn NWs; S17. β-Sn phase analysis on an InAs NW; S18. Grain boundary within β-Sn on InAs facets; S19. Additional β-Sn analysis on am InAs NW; S20. Additional β-Sn orientations on an InAs NW; S21. InSb–InAs(2 nm)–Sn; S22; Summary of 3D models of the α-β/InX configuration; S23. Growth parameters of the fabricated devices; S24. Additional device measurement., Peer reviewed

Additional experimental details, materials, and methods and images; NS low-magnification SEM image; Nyquist plot of NSs, Pt-NSs, and Pt; ΔI plot; HER LSV normalized by ECSA of NSs and Pt-NSs; Tafel plots of NSs, NSs-PT, and Pt; COMSOL simulations; polarization curve of NSs for OER; NS Nyquist plot; NS Tafel plot; OER NS LSV normalized by ECSA; NS XRD patterns; and Pt-NS SEM image after the 24 h stability test., Peer reviewed

Experimental characterization details, additional SEM, XRD, EDX data, reproducibility results, heat capacities, calculation of the Lorenz number, and comparison with previous literature., Peer reviewed