A hierarchical oxygen vacancy-rich WO₃ with “nanowire-array-on-nanosheet-array” structure for highly efficient oxygen evolution reaction

Abstract

Hierarchical vertical WO3 nanowire arrays on vertical WO3 nanosheet arrays with rich oxygen vacancies were synthesized via a simple and facile method, and the outstanding OER performance which is superior to that of most reported state-of-the-art catalysts was reported for the first time.

Sulfur‐Deficient ZnIn2S4/Oxygen‐Deficient WO3 Hybrids with Carbon Layer Bridges as a Novel Photothermal/Photocatalytic Integrated System for Z‐Scheme Overall Water Splitting

“…The strengthened ESR signal is attributed to the electron-trapped centers at S defects. [33] Meanwhile, as opposed to WO 3 exhibiting almost no ESR response at g-value of 2.010, WO displays a symmetric ESR signal, an indication of electron trapping at oxygen defects. [34] We characterize the optical and electrical performance of the photocatalysts by ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS), transient-state surface photovoltage (TS-SPV) spectroscopy, and photoluminescence (PL) spectroscopy (Figure 1d,e and Figure S2c, Supporting Information).…”

Sequential Electrodeposition of Bifunctional Catalytically Active Structures in MoO3/Ni–NiO Composite Electrocatalysts for Selective Hydrogen and Oxygen Evolution

“…[ 14 ] Keeping this in mind, introducing an OER‐preferred component into the aforementioned Ni/NiO system should help to enhance its overall water splitting performance. It has been reported that the low‐spin stated VIB group elements (e.g., Mo, W) usually show varied oxidation states and therefore their oxides give a reversible surface oxygen ion exchange capacity, [ 15 ] which could facilitate the formation of O* during OER. [ 16 ] Therefore, introducing Mo oxides into Ni/NiO system and building a new multi‐component catalyst with different heterointerfaces might give rise to a highly efficient bifunctional material system.…”

In Situ Growth of 3D NiFe LDH‐POM Micro‐Flowers on Nickel Foam for Overall Water Splitting

“…Corresponding Figure S2, Supporting Information, showed that a large amount of spherical nanoparticles deposited on NF, which were verified to be α-Fe 2 O 3 by XRD analysis (Figure S3, Supporting Information). [39] Furthermore, most of the reported NiFe LDH grown on NF exhibited sheet-like morphology by employing NaOH or urea as a hydrolysis agent. [15,40,41] Hence, in addition to provide W doping, POM herein was used and regarded as both hydrolysis and structure-direction agent.…”