Electrosynthesized Ni-Al Layered Double Hydroxide-Pt Nanoparticles as an Inorganic Nanocomposite and Potentate Anodic Material for Methanol Electrooxidation in Alkaline Media

Abstract

In this study, Ni-Al layered double hydroxide (LDH)-Pt nanoparticles (PtNPs) as an inorganic nanocomposite was electrosynthesized on the glassy carbon electrode (GCE) by a facile and fast two-step electrochemical process. Structure and physicochemical properties of PtNPs/Ni-Al LDH/GCE were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectrometry and electrochemical methods. Then, electrocatalytic and stability characterizations of the PtNPs/Ni-Al LDH/GCE for methanol oxidation in alkaline media were investigated in detail by cyclic voltammetry, chronoamperometry, and chronopotentiometry measurements. PtNPs/Ni-Al LDH/GCE exhibited higher electrocatalytic activity than PtNPs/GCE and Ni-Al LDH/GCE. Also, the resulted chronoamperograms indicated that the PtNPs/Ni-Al LDH/GCE has a better stability.

Design of Self-Supported Flexible Nanostars MFe-LDH@ Carbon Xerogel-Modified Electrode for Methanol Oxidation

“…This enhancement in the electrocatalytic activity is observed although the specific surface area and cumulative pore volume of other nanohybrids are higher than those of NiFe-LDH/CX/NF, Table 2, and the enhancement in the electrocatalytic activity of our modified NiFe-LDH/CX/NF can also be attributed to the synergistic effect between NiFe-LDH and CX during the preparation of the nanocomposites, low crystallite size, and its unique nanostars morphology. Interestingly, the electrocatalytic activity of our modified NiFe-LDH/CX/NF mesoporous electrode is higher than that previously reported for the electro-oxidation of methanol [66], as presented in Table 3. Most of the reported studies for methanol oxidation explain the activity of the electrocatalysts to the surface area of the catalyst.…”

Applications of Ceramic/Graphene Composites and Hybrids

“…The CCE/N-GO/NiCo electrode displayed 87% and 47% higher current densities than the CCE/NiCo electrode during ethanol and methanol oxidation, respectively, due to the more accessible surface and active sites created by N-GO addition, with strong interaction with metal np . In the same way, CCE/rGO/PtNi and CCE/rGO/PtCu electrodes fabricated by a similar route showed improved performance for ethanol electro-oxidation with 70% and 17% higher forward anodic peak current densities, respectively, than CCE/rGO/Pt electrode [ 87 ]. AlN/graphite carbon core-shell electrode for methanol oxidation was prepared as a low-cost alternative to replace Pt-based cathode [ 88 ].…”

Nanohybrid layered double hydroxide materials as efficient catalysts for methanol electrooxidation

“…Fuel cells have received much attention for power generation compared to other conventional energy storage systems because of their unique characteristics such as low cost, diminished greenhouse gas emission, smog pollution and simple structure. [1][2][3] Direct methanol fuel cells (DMFCs) offer wide possibilities to power electric vehicles and electronic portable devices. 4,5 The use of methanol in fuel cells is attractive due to its high energy density, ease of storage, preparation, and availability.…”