Synergistically coupling Pt with Ni towards accelerated water dissociation for enhanced alkaline hydrogen evolution

Abstract

Since the alkaline hydrogen evolution reaction (HER) on benchmark Pt/C is heavily limited by the sluggish water dissociation step, and pure Pt catalysts generally suffers from high cost and poor...

Dense Platinum/Nickel Oxide Heterointerfaces with Abundant Oxygen Vacancies Enable Ampere‐Level Current Density Ultrastable Hydrogen Evolution in Alkaline

“…In the past few years, various Pt-based catalysts with distinctive structure and compositions have been designed, including Pt alloy catalysts, [14][15][16][17] heterostructures, [18][19][20][21][22][23] Pt single-atom catalysts (SACs), [7,[24][25][26][27][28] etc. [29] Pt-based alloys show enhanced alkaline HER performance to some extent due to optimized hydrogen adsorption free energy (ΔG H* ).…”

Nanostructure Engineering and Electronic Modulation of a PtNi Alloy Catalyst for Enhanced Oxygen Reduction Electrocatalysis in Zinc–Air Batteries

“…28,45 The (111) diffraction peak for PtNi/NC at a 2θ value of ≈41.1°was located between the Pt(111) and Ni(111) peaks for the Pt 0 and Ni 0 reference samples, confirming PtNi alloying involving Pt and Ni atoms with different atomic radii. 45 Moreover, according to Bragg's equation [i.e., 2d sin θ = nλ, where d is the spacing of the diffracting planes, θ is the Bragg angle, n represents the order of reflection, and λ is the X-ray wavelength (λ = 0.15406 nm for the Cu target)], the d spacing of PtNi(111) planes can be calculated to be ∼0.22 nm. The morphology of PtNi/NC was examined using scanning electron microscopy (SEM).…”

“…The crystalline structure of PtNi/NC was analyzed using powder X-ray diffraction (XRD). The XRD pattern of PtNi/NC (Figure b) showed a very broad diffraction peak around 26.1° due to the N-doped carbon framework and sharper peaks at 41.1°, 47.9°, and 70.1° that could readily be assigned to the (111), (200), and (220) planes, respectively, of a face-centered cubic (fcc) PtNi alloy. , The (111) diffraction peak for PtNi/NC at a 2θ value of ≈41.1° was located between the Pt(111) and Ni(111) peaks for the Pt 0 and Ni 0 reference samples, confirming PtNi alloying involving Pt and Ni atoms with different atomic radii . Moreover, according to Bragg’s equation [i.e., 2 d sin θ = n λ, where d is the spacing of the diffracting planes, θ is the Bragg angle, n represents the order of reflection, and λ is the X-ray wavelength (λ = 0.15406 nm for the Cu target)], the d spacing of PtNi(111) planes can be calculated to be ∼0.22 nm.…”

Dinuclear metal synergistic catalysis for energy conversion

“…Electrochemical HER provides a tangible approach to produce H 2 , given that it can continuously generate clean H 2 , where DMCs have been widely considered as promising electrocatalysts. [151][152][153][154][155][156][157][158][159][160] For instance, Cui et al prepared tungsten atomic clusters anchored on P-doped carbon support using W single atoms as the parent material via a thermal migration strategy. The corresponding magnified HAADF-STEM images revealed numerous paired bright spots, which were identified as W 2 atom pairs.…”