Two‐Dimensional NiIr@N‐Doped Carbon Nanocomposites Supported on Ni Foam for Electrocatalytic Overall Water Splitting

Abstract

Electrochemical water splitting can providea promising avenue for sustainable hydrogen production. Highly efficient electrocatalysts toward the hydrogen evolution reaction (HER) and oxygen evolution reaction(OER) are extremely important for the practical application of water splitting technology.H erein, ao ne-step annealing strategyi s reported for the fabrication of am etal-organic frameworkderived bifunctionals elf-supportede lectrocatalyst, whichi s composed of two-dimensional N-doped carbon-wrapped Irdoped Ni nanoparticle composites supported on Ni foam

Monolayer NiIr-Layered Double Hydroxide as a Long-Lived Efficient Oxygen Evolution Catalyst for Seawater Splitting

“…22−24 Moreover, Ir has very high recycling efficiency and thus is far more environmentally friendly than some base metals present in the form of poisoning ions. 4,25,26 By introducing Ir into Ni-based catalysts, Wang's group successfully achieve the electronic control in the obtained hierarchical NiIr/C system, which showed high OER activity. The electron interaction between Ni and Ir will optimize the electron structure of Ni and Ir and benefit the electron transfer during the OER process.…”

“…The electron interaction between Ni and Ir will optimize the electron structure of Ni and Ir and benefit the electron transfer during the OER process. 25 Yang and coworkers reported that using only approximately 0.62 at. % Ir to replace the V 3+ site multilayered NiVIr-LDH showed accelerated water splitting performance owing to atomic and electronic modulation and defects.…”

“…Currently, Ni-based layered double hydroxide (LDH)-structured catalysts are known as the best OER catalysts in alkaline media in addition to the benchmark IrO 2 catalysts. Thus far, Ni-based LDHs have been developed by incorporating mainly 3d (such as NiFe-LDH and NiCo-LDH) metals or one 4d transitional metal (NiRu-LDH) in the periodic table to further improve their OER performance. − As a 5d transition metal, Ir and its oxides are the only class of catalysts that demonstrate considerable stability for the OER, although the active species (Ir n + , n is in the range of 3–5) involved in the OER are still being debated. − Moreover, Ir has very high recycling efficiency and thus is far more environmentally friendly than some base metals present in the form of poisoning ions. ,, By introducing Ir into Ni-based catalysts, Wang’s group successfully achieve the electronic control in the obtained hierarchical NiIr/C system, which showed high OER activity. The electron interaction between Ni and Ir will optimize the electron structure of Ni and Ir and benefit the electron transfer during the OER process .…”

NiO nanobelts with exposed {110} crystal planes as an efficient electrocatalyst for the oxygen evolution reaction

“…A variety of strategies including downsizing the nanomaterials to clusters 7 or single atoms, 8 controlling the morphology with two-dimensional nanosheets 9 or three-dimensional hierarchical nanostructures, 10 and constructing the heterogeneous structures by doping 11 have been developed to design more efficient electrocatalysts with more active sites and increased intrinsic activity. Electrocatalysts as heterogeneous catalysts immensely rely on their surface, which involves surface energy, coordination status, dangling bonds, atom steps, corners and edges.…”

Ethylene Glycol Electrochemical Reforming Using Ruthenium Nanoparticle-Decorated Nickel Phosphide Ultrathin Nanosheets

“…Hydrogen (H 2 ) is an environmentally friendly and clean energy, which can be used as the next generation fuel to supersede classical fossil fuels . Electrocatalytic water splitting (2H 2 O → 2H 2 + O 2 , EWS) is considered a green and efficient hydrogen production method, which has been widely investigated in recent years. − However, the widespread application of traditional EWS is hindered by some bottleneck factors: (i) the actual operating voltage largely surpasses the theoretical voltage of 1.23 V because of the slow kinetic of the anodic oxygen evolution reaction (OER); (ii) the oxygen (O 2 ) produced at the anode is easy to mix with the H 2 , resulting in the risk of explosion; and (iii) the noble metal-based electrocatalysts have inherent disadvantages of high price and scarce reserves. , Inspired by these challenges, researchers are searching the effective solutions. Recently, replacement of the anodic OER with various oxidation reactions of alcohols (such as methanol, formic acid, ethanol, ethylene glycol, isopropanol, etc.)…”