Moderation of the Electronic Structure of Phosphamides to Execute the Catalytic Appel Reaction Bypassing Phosphine.

A set of structurally analogous, albeit electronically distinct, phosphamides () is prepared, and the effect of the electronic amendment due to p-substitution has been tested for the conversion of alcohols to halides via the Appel reaction. The -OMe-substituted diphosphamide () remains the most active, providing ∼96% conversion of alcohols to halides with a TON of 11 in moderate reaction conditions with a large substrate scope. Halide formation follows a pseudo-first-order rate with a constant rate () of 7.

Evolution of Mn-BiO from the Mn-doped BiOBr electro(pre)catalyst during the oxygen evolution reaction.

Mn-doped BiOBr has been synthesized using a solvothermal route. The undoped BiOBr and Mn-BiOBr materials possess orthorhombic unit cells with two distinct Bi sites forming a layered atomic arrangement. The shift in the (020) plane in the powder X-ray diffraction (PXRD) pattern confirms Mn-doping in the BiOBr lattice.

Surface Structure to Tailor the Electrochemical Behavior of Mixed-Valence Copper Sulfides during Water Electrolysis.

The semiconducting behavior of mixed-valence copper sulfides arises from the pronounced covalency of Cu-S bonds and the exchange coupling between Cu and Cu centers. Although electrocatalytic study with digenite CuS and covellite CuS has been performed earlier, detailed redox chemistry and its interpretation through lattice structure analysis have never been realized. Herein, nanostructured CuS and CuS are prepared and used as electrode materials to study their electrochemistry.

Elucidating the Role of Atomically Dilute Copper Centers Impregnating a Phosphamide Polymer for the Preferential Hydrogen Evolution Reaction over CO Reduction.

Organic polymers have attracted considerable interest in designing a multifunctional electrocatalyst. However, the inferior electro-conductivity of such metal-free polymers is often regarded as a shortcoming. Herein, a nitrogen- and phosphorus-rich polymer with phosphamide functionality (PAP) in the repeating unit has been synthesized from diaminopyridine (DAP) and phenylphosphonic dichloride (PPDC) precursors.

Redox-active Sn(II) to lead to SnFeO spinel as a bi-functional water splitting catalyst.

Despite several reports on metal ferrites for water splitting studies, SnFeO is a rarely explored spinel oxide. Herein, solvothermally prepared 5 nm SnFeO nanoparticles deposited on nickel foam (NF) behaves as a bi-functional electrocatalyst. In alkaline pH, the SnFeO/NF electrode exhibits oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) at moderate overpotentials and shows a fair chronoamperometric stability.

Integrating Electrochemical CO Reduction on α-NiS with the Water or Organic Oxidations by Its Electro-Oxidized NiO(OH) Counterpart to an Artificial Photosynthetic Scheme.

Efficient hydrogen production, biomass up-conversion, and CO-to-fuel generation are the key challenges of the present decade. Electrocatalysis in aqueous electrolytes by choosing suitable transition-metal-based electrode materials remains the green approach for the trio of sustainable developments. Given that, finding electrode materials with multifunctional capability would be beneficial.

γ-FeO(OH) with multiple surface terminations: Intrinsically active for the electrocatalytic oxygen evolution reaction.

Due to poor conductivity, the electrocatalytic performance of independently prepared iron oxy-hydroxide (FeO(OH)) is inferior whereas FeO(OH) derived from the iron based electro(pre)catalyst shows superior performance in the oxygen evolution reaction (OER). Use of mixed phase FeO(OH) and/or incorporation of Co/Ni metal into the FeO(OH) structure has also been demonstrated as a convenient approach to achieve high OER activity. Nevertheless, preparation of phase-pure, albeit active FeO(OH) material with fair electrochemical performance remains a perdurable challenge.

Electrochemically Derived Crystalline CuO from Covellite CuS Nanoplates: A Multifunctional Anode Material.

In the present era, electrochemical water splitting has been showcased as a reliable solution for alternative and sustainable energy development. The development of a cheap, albeit active, catalyst to split water at a substantial overpotential with long durability is a perdurable challenge. Moreover, understanding the nature of surface-active species under electrochemical conditions remains fundamentally important.

Dumbbell-Shaped Ternary Transition-Metal (Cu, Ni, Co) Phosphate Bundles: A Promising Catalyst for the Oxygen Evolution Reaction.

Development of economical and high-performance electrocatalysts for the oxygen evolution reaction (OER) is of tremendous interest for future applications as sustainable energy materials. Here, a unique member of efficient OER electrocatalysts has been developed based upon structurally versatile dumbbell-shaped ternary transition-metal (Cu, Ni, Co) phosphates with a three-dimensional (3D) (Cu(OH)(PO)/Ni(PO)·8HO/Co(PO)·8HO) (CNCP) structure. This structure is prepared using a simple aqueous stepwise addition of metal ion source approach.