Boosting effects of hydroxyl groups on porous carbon for improved aqueous zinc-ion capacitors

Graphite Nanoflake-Modified Mo2C with Ameliorated Interfacial Interaction as an Electrocatalyst for Hydrogen Evolution Reaction

“…34−36 The C 1s spectrum (Figure 1d) of Mo 2 C/G-B presents a main peak at a binding energy of 284.8 eV associated with the presence of graphite nanoflakes (C−C), while the fitted peak at 285.7 eV is consistent with C−O species, which is usually detected in the carbon matrix. 37,38 The peak at a binding energy of 284.5 eV corresponding to the C−Mo bond is observed, proving electronic coupling at the interface between Mo 2 C quantum dots and graphite nanoflakes. 20 The morphology of Mo 2 C/G-B was investigated by SEM.…”

“…Meanwhile, the spectrum was dominated by a doublet with two sharp peaks located at 233.2 and 236.2 eV, which came from a Mo 6+ species (MoO 3 ). Beyond that, two pairs of peaks with binding energies of 233.5/230.3 and 235.1/232.0 eV corresponded to Mo 4+ species (MoO 2 ) and Mo 5+ species, respectively. , The Mo species with higher valences resulted from the surface oxidation of Mo 2 C, which is inevitable for Mo 2 C-based materials, especially for those with nanostructures. ,− ,, However, the surface oxidation has no negative influence on the electrocatalytic activity and even shows positive correlation with HER activity. − The C 1s spectrum (Figure d) of Mo 2 C/G-B presents a main peak at a binding energy of 284.8 eV associated with the presence of graphite nanoflakes (C–C), while the fitted peak at 285.7 eV is consistent with C–O species, which is usually detected in the carbon matrix. , The peak at a binding energy of 284.5 eV corresponding to the C–Mo bond is observed, proving electronic coupling at the interface between Mo 2 C quantum dots and graphite nanoflakes …”

Electrochemical and electrical characteristics of ball milled Cs2Ti6O13 modified by the surface-to-bulk migration of hydroxyl groups

“…We performed static GCD measurements of the Cs 2 Ti 6 O 13 samples dried at 80 °C in 1 M Na 2 SO 4 to investigate the influence of hydroxyl groups toward charge storage, because hydroxyl groups are generally considered beneficial for electrochemical supercapacitors. [57][58][59] Fig. 5a and b show the distorted triangular profiles which are accompanied by an IR drop right after full charging.…”

Metal–organic frameworks and their derivatives for metal-ion (Li, Na, K and Zn) hybrid capacitors

“… 180 It has also been reported that the hydroxyl group promotes the storage behavior of Zn 2+ in porous carbon, and the pseudocapacitive contribution and the chemisorption of Zn 2+ have been investigated. 181 Yan's group demonstrated that oxygen-containing functional groups in carbon nanosheets provide defects and additional active sites. These features facilitate K + storage and enable high-performance PIHCs.…”