A two-dimensional ion-pump of a vanadium pentoxide nanofluidic membrane

Abstract

The reactive surface and layered crystal structure of vanadium pentoxide (V2O5) are exploited here to prepare a two-dimensional (2D) ion pump that transports ions against their concentration gradient.

Extraction of Evaporation-Driven Electrokinetic Streaming Potential from V2O5 Nanochannels through Secondary Sources

“…The nanofluidic membrane of V 2 O 5 explored here for the evaporation-induced energy-harvesting process was prepared through vacuum-assisted self-assembly of its exfoliated two-dimensional (2D) sheets. The nanosheet sample was prepared by treating bulk V 2 O 5 powder with H 2 O 2 under ice-cold conditions, following a procedure reported earlier . Field emission transmission electron microscope (FETEM) analysis of the aqueous V 2 O 5 dispersion shows the presence of a large number of 2D sheets of dimensions ranging between 50 and 300 nm (Figure a).…”

“…The nanosheet sample was prepared by treating bulk V 2 O 5 powder with H 2 O 2 under ice-cold conditions, following a procedure reported earlier. 25 Field emission transmission electron microscope (FETEM) analysis of the aqueous V 2 O 5 dispersion shows the presence of a large number of 2D sheets of dimensions ranging between 50 and 300 nm (Figure 1a). The atomic force microscopy (AFM) image along with the height profile in Figure 1b reveals the height of the nanosheets to be in the range of 3−6 nm.…”

“…Carbon dioxide dissolves in rainwater forming weak carbonic acid and makes rainwater slightly acidic. Owing to the high proton conductivity of the V 2 O 5 channels, 25 rainwater gives a slightly more power output. The pH values of the water collected from different sources are given in Table S2.…”

Long-range selective transport of anions and cations in graphene oxide membranes, causing selective crystallization on the macroscale

“…22 Such electrically driven ion transport can be achieved with simple, cheap setups and even used to create uni-directional ion pumps not only in GOMs 23 but also in other layered materials such as V 2 O 5 . 24 Most published studies on electric-eld assisted ion transport focus on simple ions like K + and H + ; ion transport through GO-based membranes under the inuence of an applied potential has been studied previously by Hong et al, 25 and further studies with MoS 2 membranes have been conducted by Hirunpinyopas et al 26,27 The predominant transport mechanism has been attributed to the electrostatic attraction between the cations in solution and the negatively charged membrane channels, with atomic radii only affecting the transport above the critical channel width. 28 In this work, we used electric elds to study the transport of different ions in GOMs between two vials connected through a mesoscopic GOM (Fig.…”

Light-Controlled Ionic Transport through Molybdenum Disulfide Membranes

“…The XRD pattern of the MoS 2 membrane is displayed in Figure 1d. 40 41 Similarly, the current−voltage (I−V) curve of the membranes in different KCl concentrations were also recorded (Figure 2b), which displayed the same behavior as the NaCl solutions. The ionic conductivity through the MoS 2 membranes was plotted as a function of the concentration (Figure 2c).…”