Controlling the 3-D morphology of Ni–Fe-based nanocatalysts for the oxygen evolution reaction

Abstract

The 3-D morphology plays a key role in the optimization of the electrocatalytic activity and stability of nanocatalysts for the OER.

Heteroatom Promoted Ni/Al2O3 Catalysts for Highly Efficient Hydrogenation of 1,4‐Butynediol to 1,4‐Butenediol

“…According to SI, Figure S3, the binding energy for reduced Fe/Al 2 O 3 catalyst is at 711.2 eV, which is ascribed to Fe 2+ . However, the Fe 2p 3/2 peak on Ni−Fe/Al 2 O 3 catalyst shifts towards higher binding energy as 713.1 eV, which indicates the formation of Ni−Fe alloy, and similarly to the previous report by Manso's group …”

“…H 2 temperature‐programmed reduction (H 2 ‐TPR) technique permits not only to characterize the metal‐support interactions but also to elucidate the role of promoters in the reduction process and the influence of one or more component systems . Figure shows the H 2 −TPR profiles of Ni/Al 2 O 3 and Ni−M/Al 2 O 3 (M=Ce, Ag, Mo, Fe, and Co), in which the overlapped peaks are deconvolved using Gaussian‐type functions.…”

“…The peaks in the range of 473–723 K are ascribed to α‐NiO species, corresponding to free NiO species possessing weak interactions with or keeping away from the Al 2 O 3 support. β 1 ‐NiO phase is located at 723–873 K, being attributed to the more reducible NiO in the Ni‐rich mixed oxide phase, while the β 2 ‐NiO is at 873–1023 K, being assigned to the less reducible one in Al‐rich phase . Subsequently, the peak in the range of 1023–1173 K is mainly attributed to γ‐NiO, which is a stable nickel aluminum spinel phase (NiAl 2 O 4 ).…”

An Anion‐Exchange Membrane Fuel Cell Containing Only Abundant and Affordable Materials

“…The peak at high energy loss regions at 531 eV, doublet at 708/721 eV, and the doublet at 853/872 eV correspond to O, Fe L 2,3 , and Ni L 2,3 , respectively, due to inner electron transition and suggests that Fe and Ni nanoparticles are at least partially oxidized. [ 28 ]…”

“…The peak at high energy loss regions at 531 eV, doublet at 708/721 eV, and the doublet at 853/872 eV correspond to O, Fe L 2,3 , and Ni L 2,3 , respectively, due to inner electron transition and suggests that Fe and Ni nanoparticles are at least partially oxidized. [28] Figure 1f shows the SEM image of the N-doped carbon. The flakes are a few microns in diameter, with a macroporous network that enables a fast mass transfer.…”