Hierarchically structured flower-like Ru nanoparticles-cucurbit[6]uril/multiwalled carbon nanotubes as efficient pH-universal hydrogen evolution electrocatalyst

Stabilizing Sub-2-nm CuIr Nanoalloys with Cucurbit[6]uril for Oxygen Evolution Reaction in Strong Acid

“…CB [6], which could protect alloy NPs against agglomeration and overgrowth, contributes to more uniform alloy NPs distribution in smaller sizes for different alloy compositions by steric hindrance and charge restriction. 29,32 In the inset in Figure 1b, the interplanar spacing of the CB[6]-Cu 0.33 Ir 0.67 alloy measured from the HR-TEM image is 0.21 nm, which is consistent with the lattice spacing of CuIr {111} facets. The energy dispersive X-ray spectroscopy (EDS) mapping profile (Figures 1f and 1g Next, the OER catalytic activity of all the catalysts is measured by linear sweep voltammetry (LSV) in O 2 -saturated 0.5 M H 2 SO 4 aqueous solution.…”

“…Additionally, the size measurements suggest that the series of CB[6]-Cu x Ir (1– x ) hybrids in different alloy compositions present similar sizes of ∼2.0 ± 0.3 nm (Figures S3, S4, and S5 in the Supporting Information). CB[6], which could protect alloy NPs against agglomeration and overgrowth, contributes to more uniform alloy NPs distribution in smaller sizes for different alloy compositions by steric hindrance and charge restriction. , In the inset in Figure b, the interplanar spacing of the CB[6]-Cu 0.33 Ir 0.67 alloy measured from the HR-TEM image is 0.21 nm, which is consistent with the lattice spacing of CuIr {111} facets. The energy dispersive X-ray spectroscopy (EDS) mapping profile (Figures f and g) shows that the bimetallic Cu–Ir NPs are composed of elements Cu and Ir.…”

Interfacial electronic engineering of a Ni3ZnC0.7/Ni heterostructure embedded in N-doped carbon nanotubes for efficient alkaline electrocatalytic hydrogen evolution

“…Furthermore, one-dimensional (1D) N-doped carbon nanotubes (CNTs) may provide a fast charge transfer pathway for the rapid migration of electrons-ions during the electrochemical process. [23][24][25] Also, constructing the heterostructured catalyst by interfacial electronic engineering between two or more components has been reported to be an effective strategy to enhance electrocatalytic HER activity. 26,27 Therefore, it is highly desirable to design a novel material system which can anchor a Ni 3 ZnC 0.7 /Ni heterostructure on such 1D CNTs for the improvement of catalytic HER efficiency.…”