Organic Acid Anions Modified α-Co(OH)₂ with Enhanced Activity for the Decomposition of Cyclohexyl Hydroperoxide

Abstract

α-Co(OH) 2 nanoplatelets with tunable wettability (hydrophilicity/hydrophobicity) and interlayer spacing were designed to catalyze cyclohexyl hydroperoxide (CHHP) decomposition in alkali-free medium. The interlayer spacing and its wettability of α-Co(OH) 2 nanoplatelets were adjusted by intercalating with aliphatic acid anions of different chain lengths. SEM, TEM, XRD, FT-IR spectroscopy, and water droplet contact angle measurements were conducted to characterize the catalysts. The structure−activity relationships of aliphatic acid anions intercalated α-Co(OH) 2 nanoplatelets in CHHP decomposition were discussed in detail. Expanding interlayer gallery and enhancing the dispersibility of α-Co(OH) 2 nanoplatelets in the reaction mixture are effective ways to improve mass transfer process of CHHP decomposition. α-Co(OH) 2 nanoplatelets with both high dispersibility and wide interlayer spacing provide a new strategy to improve the catalytic efficiency of CHHP decomposition.

Unraveling Nanoscale Cobalt Oxide Catalysts for the Oxygen Evolution Reaction: Maximum Performance, Minimum Effort

“…Peaks of the sample Standard-D-1h are less pronounced in the region between 800 and 1600 cm –1 , and three peaks are present in the fingerprint region at 519, 581, and 668 cm –1 . This might indicate the formation of an α-Co­(OH) 2 phase . Interestingly, for the Standard-D-20h sample, a peak at 584 cm –1 demonstrates a clear similarity to the “Standard” samples under illumination and >10 min reaction time, which agrees well with the PXRD results.…”

“…Figure S15 shows that the ν(Co 2+ tetrahedral O) peak disappears between 5 and 7 min. Additionally, postcatalytic samples of 59 Interestingly, for the Standard-D-20h sample, a peak at 584 cm −1 demonstrates a clear similarity to the "Standard" samples under illumination and >10 min reaction time, which agrees well with the PXRD results. This suggests that, when the suspension is shielded from light, it takes several hours for the material to change its structure in the dark, related to what was seen for the Standard-L samples.…”

“…Furthermore, the presence of α-/β-Co­(OH) 2 can be neglected, due to the difference in the fingerprint region and especially on the basis of the absent O–H peak of β-Co­(OH) 2 at around 3650 cm –1 (see Figure S14). − These findings correlate well with the results from the PXRD patterns and suggest the migration of tetrahedrally coordinated Co cations to octahedral sites. To further specify the time scale of this structural change, the Co-based catalysts were isolated after 3, 5, and 7 min as well.…”

Confinement Catalyst of Co9S8@N-Doped Carbon Derived from Intercalated Co(OH)2 Precursor and Enhanced Electrocatalytic Oxygen Reduction Performance

“…The XRD pattern (Figure S1) shows a series of characteristic diffraction peaks of α-Co­(OH) 2 . The (003), (006), and (009) peaks, which shift toward a small angle direction, indicate the intercalation structure of the Co­(OH) 2 precursor . In addition, the FT-IR of the intercalated Co­(OH) 2 precursor showed the characteristic vibrational peaks of metanilic acid (Figure S2).…”

“…36 The (003), (006), and (009) peaks, which shift toward a small angle direction, indicate the intercalation structure of the Co(OH) 2 precursor. 37 In addition, the FT-IR of the intercalated Co(OH) 2 precursor showed the characteristic vibrational peaks of metanilic acid (Figure S2). 38 The XRD and FT-IR results indicate that the metanilic acid was successfully intercalated into the interlayer of α-Co(OH) 2 .…”