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Article Abstract
Phase-pure ultrafine WC nanostructures are promising electrocatalysts but face synthesis challenges due to unclear formation mechanisms and harsh thermodynamics. Here, we reveal the formation mechanism of ultrathin WC nanowires (NWs) confined in the cavity of single-wall carbon nanotubes (SWCNTs) at the atomic scale by combined transmission electron microscopy and density functional theory calculations. It was found that the hollow core of SWCNTs can control the phase, axial orientation, and diameter of WC NWs. Leveraging this mechanism, we synthesized SWCNT-encapsulated WC NWs, WS-WC heterostructures, and WS NWs (1D@1D), which assembled into free-standing hybrid films. The integrated WC NWs@SWCNT membrane was primarily tested, exhibiting a low overpotential of 44 mV to reach a current density of 10 mA cm and outstanding durability (500 h at a high current density of 250 mA cm in acidic conditions).
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| http://dx.doi.org/10.1021/acs.nanolett.5c01381 | DOI Listing |
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