A promising N-doped carbon-metal oxide hybrid electrocatalyst derived from crustacean’s shells: Oxygen reduction and oxygen evolution

Biomass‐Derived N‐doped Carbon Materials with Silica‐Supported Ultrasmall ZnO Nanoparticles: Robust Catalysts for the Green Synthesis of Benzimidazoles

“…[6,33] The deconvolution of N1senergy-level signals ( Figure 6d)s uggests that ZnO/SiO 2 -NC-600 contains several nitrogen species, including intact NH 2 groups (397.74 eV); pyridinic,p yrrolic,a nd graphitic nitrogen atoms (398.73, 399.72, and 400.70 eV,respectively), and pyridinic N-oxide functions (402.01 eV). [6,[34][35][36] In addition, an N1 ss ignal also appears at 398.13 eV,w hich falls in the range of the binding energies of NÀZn bonds, thus further verifying that interactions be- tween ZnO nanoparticlesa nd the N-doped carbon support exist. [24,37] The scope of applicability of the ZnO/SiO 2 -NC-600 catalyst was explored for the synthesis of 2-arylbenzimidazoles by using various aromatic aldehydesa nd diamines in methanol.…”

Efficient Direct Formic Acid Fuel Cells (DFAFCs) Anode Derived from Seafood waste: Migration Mechanism

“…2B . Both PtNPs (curve b) and commercial Pt/C (curve c) modified GCE electrodes exhibited the typical behavior of FAO dual-mechanism at a clean polycrystalline Pt surface, with the appearance of two oxidation peaks at ~0.3 V and ~0.72 V in the positive-going potential scan 1 , 3 , 10 , 11 , 17 , 21 , 33 – 35 . Those two peaks are ascribed, respectively, to the direct pathway (in which FA is directly dehydrogenated to CO 2 , assigned as I p d ) and indirect/poisoning route (in which the generated adsorbed CO from the non-faradaic dissociation of FA are being oxidized to CO 2 , denoted as I p ind ).…”

“…This is in good agreement with the negative shift observed for the CO stripping peak in electrochemical measurements obtained at chitosan-PtNPs nanocomposite compared to that of PtNPs. The high resolution XPS C1s spectrum of the nano-chitosan-PtNPs can be deconvoluted into four well defined peaks at 285 eV (assigned to C-C, C-H and C-NH2), 287 eV (indexed to C-O and C=N), 288.3 eV (attributed to C=O and N-C-O) and 289 eV (assigned to O=C-O and O-C-O) 3 , see Fig. S4A .…”

“…Nevertheless, they still suffer from their insufficient long-term stability that obviously restricts their overall commercialization prospect. Unfortunately, this results from the fast deactivation of their commercial Pt-based catalysts with in-situ generated carbon monoxide (CO) intermediates from the “ non-faradaic ” dehydration of formic acid at the Pt surface 1 , 3 , 9 – 11 . Thus, the development of an efficient and stable DFAFCs anode catalyst for formic acid electrooxidation (FAO) with a high CO poisoning tolerance is a key requirement for their commercialization and practical application.…”

“…Herein, PtNPs embedded in a nano-chitosan matrix are introduced as alternative efficient and stable anode catalyst for DFAFCs. Chitosan is a natural polysaccharide biopolymer obtained from the deacetylation of chitin, which is the second most abundant natural polysaccharide and the major component of crustacean shells (e.g., shrimps, crabs, etc) 3 , 30 . We found that chitosan effectively reduces the average PtNPs size, improves the PtNPs dispersion, preventing the PtNPs sintering under the harsh electrochemical conditions through the strong interaction between the chitosan functionalities and PtNPs.…”