Chromium oxide nanoparticles with controlled size prepared from hydrothermal chromium oxyhydroxide precursors

Reliable electrochemical phase diagrams of magnetic transition metals and related compounds from high-throughput ab initio calculations

“…CrOOH precipitates are widely observed in solutions at pH ≳ 3, [53][54][55][56][57] which is consistent with the boundary between CrOOH and Cr 3+ at pH 2~3.5 and V SHE~0 V in the DFT diagrams (Fig. 3a, center and right panels).…”

“…3a, center and right panels). The hydrous Cr 2 O 3 (e.g., CrOOH) formed in aqueous solutions transforms into the anhydrous Cr 2 O 3 only upon heating at temperatures ≳700 K. 55,57 In addition, the formation of anhydrous Cr 2 O 3 (not CrOOH) underneath an outer Cr(OH) 3 layer has been observed on 254 MO stainless steels (Fe-20%, Cr-18%, and Ni-6% Mo, in wt.%). 58 These corrosion processes likely originate from the kinetic and/or thermodynamic effects of the other alloying elements on the electrochemical stabilities of Cr 2 O 3 and CrOOH.…”

A techno-economic assessment of the potential for combining supercritical water oxidation with ‘in-situ’ hydrothermal synthesis of nanocatalysts using a counter current mixing reactor

“…There are other papers to support the assumption that this greenish suspension is the Cr equivalent of boehmite (AlOOH). Most researchers conclude that a minimum of 450 o C is required to convert the CrOOH to Cr 2 O 3 [58,59] which is higher than the experiments in this paper. However, the CrOOH is clearly the best catalyst in this work.…”

Preparation and Reflectance Spectrum Modulation of Cr2O3 Green Pigment by Solution Combustion Synthesis

“…It can be found that well-defined sub-micron crystalline grains with slight aggregation are observed in both two samples, while the grain size of S1-1000 is larger than that of S1-900, indicating that a higher calcination temperature is beneficial to accelerating the growth of Cr 2 O 3 grains. When compared with Cr 2 O 3 samples prepared by a hydrogen reduction of chromite ore [1] and thermal decomposition of chromium hydroxide [12,13], the serious aggregation and grain size distribution are efficiently optimized. From Figure 4d, we can know that the morphology of S12 is similar to that of S1-1000, where the grain size is estimated to be about 0.4 µm, implying that Fe/Co/Ti doping has no negative effects during this process.…”