Engineering of carbon nanotube-grafted carbon nanosheets encapsulating cobalt nanoparticles for efficient electrocatalytic oxygen evolution

Abstract

The introduction of volatile zinc and LDHs improves the exposure of active sites, thereby enhancing the electrocatalytic performance of the hierarchical structural material toward the oxygen evolution reaction.

Al-Incorporated Cobalt-Layered Double Hydroxides for Enhanced Oxygen Evolution through Morphology and Electronic Structure Regulation

“…For these LDHs, the diffraction peaks at 11.6, 23.3, 34.4, 38.9, 59.8, and 60.8° can be indexed to the (003), (006), (012), (015), (110), and (0015) planes of CoAl LDH (JCPDS no. 00-051-0045), , respectively. For Co LDH, the XRD pattern shows the diffraction features of the hydrotalcite-like phase with weak signal intensity.…”

“…For these LDHs, the diffraction peaks at 11.6, 23.3, 34.4, 38.9, 59.8, and 60.8°can be indexed to the (003), (006), (012), (015), (110), and (0015) planes of CoAl LDH (JCPDS no. 00-051-0045), 27,28 2b, the peak in the vicinity of 3500 cm −1 can be obviously observed for Co LDH/CC and Co 2 Al 1 LDH/CC, ascribing to O−H stretching vibration from the −OH group in the hydroxide layers and the interlayered water molecule. 20 As for AlF 2 OH/CC without a hydrotalcite-like phase, this peak is so weak.…”

Constructing an efficient electrocatalyst for water oxidation: an Fe-doped CoO/Co catalyst enabled by in situ MOF growth and a solvent-free strategy

“…This observation can be attributed to the weak acidity of Zn(Ac) 2 , which slowly corroded a portion of the Co metal and converted it to CoO at high temperature. Additionally, the evaporation of Zn species at high temperature reduced agglomeration and enhanced the contact between CoO and Co. 11 Subsequently, the ZIF-67/Co precursor with high yield was in situ grown via the coordination reaction between CoO/Co and 2-MI. The purpose of the in situ growth of ZIF-67 was not only to achieve uniform adsorption of Fe species, but also to increase the surface area of the final Fe-CoO/Co product, ultimately leading to the exposure of more active sites.…”

“…However, their exorbitant price, scarcity and unsatisfactory OER kinetics restrict their scale-up applications. [8][9][10][11][12] Therefore, massive efforts have been devoted to exploring alternative Earth-abundant metal electrocatalysts. In pursuit of this aim, transition metals (such as Fe, Co and Ni) and their compounds of oxides, nitrides, chalcogenides, phosphates and carbides have been demonstrated to show excellent electrocatalytic OER performance.…”