This Review provides a comprehensive overview of LiNiO2 (LNO), almost 30 years after its introduction as a cathode active material. We aim to highlight the physicochemical peculiarities that make LNO a complex material in every aspect. We specifically stress the effect of the Li off‐stoichiometry (Li1−zNi1+zO2) on every property of LNO, especially the electrochemical ones. The key instability issues that plague the compound and the strategies that have been implemented so far to overcome them are discussed in detail. Finally, the open questions that remain to be addressed by the scientific community are summarized, and the research directions that seem the most promising to enable LNO to be fully exploited are elucidated.

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TiC, TiCN and TiN supported Pt nanoparticles have been investigated as anode electrocatalytic materials for direct methanol fuel cells (DMFCs). The catalysts were studied in acidic and alkaline media and compared with platinum supported on carbon black. CO and methanol oxidation were studied by voltammetry and chronoamperometry techniques. Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analysis were employed to characterize the novel catalysts.Results show that carbon supported Pt catalyst is mainly formed by nanoparticles with long (111) domains and those catalysts with a titanium-based support present a huge amount of defect sites with diverse symmetries.Additionally to geometric factors, an electronic effect by the Ti-based support leads to a considerably enhance of CO electrooxidation with respect to carbon supported catalyst, which is of special relevance in alkaline media. However, no such improvement is observed during the methanol oxidation reaction on Tibased catalysts at high pH.

An enhanced catalytic activity towards the CO and methanol electrooxidation on TiC and TiCN materials, induced by surface oxides at the Pt/support interface, is reported.