Pd–Ni nanoparticles supported on reduced graphene oxides as catalysts for hydrogen generation from hydrazine

Abstract

A composite material of Pd–Ni nanoparticles supported on reduced graphene oxide (Pd–Ni/rGO) has been synthesised via an in situ reduction of PdO/Ni(OH)2 nanoparticles on GO.

Heteroatom (N, O, and S)-Based Biomolecule-Functionalized Graphene Oxide: A Bifunctional Electrocatalyst for Enhancing Hydrazine Oxidation and Oxygen Reduction Reactions

“…The hydrazine oxidation mechanism in aqueous solutions can be defined as a four-electron transfer process forming N 2 and H + , which can then react with OH to form water as shown Scheme . This is in good agreement with the literature. , …”

“…This is in good agreement with the literature. 32,89 5. CONCLUSIONS In this work, we have synthesized a metal-free electrocatalyst containing O, S, and N heteroatoms via L-cysteine functionalization on GO (L-Cy-rGO).…”

“…In particular, the low operating stability, fuel crossover effect, and CO poisoning effect inherently associated with the Pt catalyst have further restricted the commercialization of the fuel-cell technologies. , On the other hand, in fuel-cell-based electrochemical devices known as direct alcohol fuel cells (DAFCs), catalytic oxidation of an alcohol by oxygen can be used to generate electricity. For example, commonly used oxidation fuel cells include direct methanol fuel cells (DMFCs), direct ethanol fuel cells (DEFCs), direct hydrazine fuel cells (DHFCs), and direct urea fuel cells (DUFCs), and other energy-related applications are electrochemical hydrocarbon oxidation, CO 2 emission, and so forth. − More significantly, hydrazine (N 2 H 4 ) is one of the hydrogen-rich, carbon-free small species with oxidation products (N 2 ) that are environmentally friendly. , Recent developments in this field proposed hydrous hydrazine, such as hydrazine monohydrate, which is a fluid over a broad temperature range of 213–392 K having a potential as a H 2 storage compound/species. − Such a species includes a hydrogen content as high as 8.0 wt % available for H 2 production, which could be emitted by full hydrazine decomposition into H 2 and N 2 through the H 2 NNH 2 → N 2 + 2H 2 reaction and has the distinct advantages of fast recharging and reliability for developing new liquid fuel refill systems. , Certainly, the advancement of using H 2 as a clean fuel and the challenges in its safe and efficient processing, numerous advanced research strategies have been established for the development of new materials capable of storing and delivering appropriate levels of molecular H 2 . ,− In past decades, noble-metal (Pt, Pb, Ir, and Pd)-based electrocatalytic systems were commonly used as electrochemical energy-conversion and -storage devices because of having higher stability and chemical inertness, e.g., for fuel cells, batteries, and supercapacitors. , The major limitation of noble-metal-based systems is its high cost with low abundance. Therefore, replacing noble-metal catalysts by non-precious-metal catalysts in energy technologies is one of the proposed alternatives .…”

Noble-metal-free nanocatalysts for hydrogen generation from boron- and nitrogen-based hydrides

“…Other metal NPs, such as Co, Ru, and Ir, exhibited poor H 2 selectivity (7%), and Fe, Cu, Ni, Pd, and Pt were totally inactive under the same reaction conditions. Up to now, Ni, [369][370][371][372] Ni-Pt, [373][374][375][376][377] Ni-Rh, [378][379][380][381][382][383] Ni-Ir, 384,385 Ni-Pd, 386,387 Co-Pt, 388,389 Co-Ir, 390 Rh-Mo, 191 Rh-P, 391 Ni-Fe, [392][393][394] Ni-Cu, 224,395,396 and Ni-Co 397 have been reported to be efficient in the decomposition of N 2 H 4 •H 2 O to H 2 . Since noble metals (Pt, Rh, Ir, and Pd) are expensive, noble-metal-free catalysts (Ni, Fe, and Cu) were developed for the economic advantage, which is essential for promoting the potential applications of N 2 H 4 •H 2 O as a hydrogen storage material.…”

Metal nanoparticles supported on crystalline Al( OH ) 3 Nano sheets for efficient catalytic hydrogen production from hydrous hydrazine in aqueous solution

“…Ni‐alloyed 7 with valuable metal Rh, 8 Pt, Ir, Pd 9‐11 objective as nonhonorable metal Fe, 12‐14 Co, 15 Cu, 16,17 and Mo 18 were combined and connected as proficient catalysts for N 2 H 4 ·H 2 O dehydrogenation. Various Ni‐based monometallic and bimetallic catalysts were examined.…”