Oxidation-induced three-dimensional morphological changes in Ni nanoparticles observed by coherent X-ray diffraction imaging

Three-dimensional structures of Ni nanoparticles undergoing significant morphological changes on oxidation were observed non-destructively using coherent X-ray diffraction imaging. The Ni particles were oxidized into Ni1O1 while forming pores of various sizes internally. For each Ni nanoparticle, one large void was identified at a lower corner near the interface with the substrate. The porosity of the internal region of the agglomerated Ni oxide was about 38.4%. Regions of high NiO density were mostly observed at the outer crust of the oxide or at the boundary with the large voids. This research expands our understanding of general catalytic reactions with direct observation of oxidation-induced nanoscale morphological changes.

Fe-Induced electronic optimization of mesoporous Co–Ni oxide nanosheets as an efficient binder-free electrode for the oxygen evolution reaction

An efficient binder-free OER electrode CoNiFeOx/NF with mesoporous structure was synthesized by a facile strategy of hydrothermal method and post-annealing.

Ni on graphene oxide: a highly active and stable alkaline oxygen evolution catalyst

A novel oxygen evolution catalyst was prepared by reacting NiCl2·6H2O with electrochemically exfoliated graphene oxide (EGO) using mild reaction conditions, leading to the simultaneous formation and deposition of Ni oxide nanoparticles onto EGO.