文摘
High surface area in h-WOb>3b> has been verified from the intracrystalline tunnels. This bottom-up approach differs from conventional templating-type methods. The 3.67 脜 diameter tunnels are characterized by low-pressure COb>2b> adsorption isotherms with nonlocal density functional theory fitting, transmission electron microscopy, and thermal gravimetric analysis. These open and rigid tunnels absorb H+ and Li+, but not Na+ in aqueous electrolytes without inducing a phase transformation, accessing both internal and external active sites. Moreover, these tunnel structures demonstrate high specific pseudocapacitance and good stability in an Hb>2b>SOb>4b> aqueous electrolyte. Thus, the high surface area created from 3.67 脜 diameter tunnels in h-WOb>3b> shows potential applications in electrochemical energy storage, selective ion transfer, and selective gas adsorption.
