Enriched Electrophilic Oxygen Species on Ru Optimize Acidic Water Oxidation.

Ruthenium oxide (RuO) is considered one of the most promising catalysts for replacing iridium oxide (IrO) in the acidic oxygen evolution reaction (OER). Nevertheless, the performance of RuO remains unacceptable due to the dissolution of Ru and the lack of *OH in acidic environments. This paper reports a grain boundary (GB)-rich porous RuO electrocatalyst for the efficient and stable acidic OER.

Cobalt telluride regulated by nickel for efficient electrooxidation of 5-hydroxymethylfurfural.

Replacing the anodic oxygen evolution reaction (OER) in water splitting with 5-hydroxymethylfurfural oxidation reaction (HMFOR) can not only reduce the energy required for hydrogen production but also yield the valuable chemical 2,5-furandicarboxylic acid (FDCA). Co-based catalysts are known to be efficient for HMFOR, with high-valent Co being recognized as the main active component. However, efficiently promoting the oxidation of Co to produce high-valent reactive species remains a challenge.

Shifting the Oxygen-Evolution Reaction Pathway via Cation Engineering to Activate Lattice Oxygen in Metal-Organic Frameworks.

Metal-organic frameworks (MOFs) as promising electrocatalysts have been widely studied, but their performance is limited by conductivity and coordinating saturation. This study proposes a cationic (V) modification strategy and evaluates its effect on the electrocatalytic performance of CoFe-MOF nanosheet arrays. The optimal V-CoFe-MOF/NF electrocatalyst exhibits excellent oxygen-evolution reaction (OER)/hydrogen-evolution reaction (HER) performance (231 mV at 100 mA cm/86 mV at 10 mA cm) in alkaline conditions, with its OER durability exceeding 400 h without evident degradation.

Easy conversion perovskite fluorides KCoFeF for efficient oxygen evolution reaction.

Herein, we report an easily oxidized Co-Fe perovskite fluoride as an efficient catalyst for the oxygen evolution reaction (OER). Raman spectroscopy showed that the presence of F promotes reconstruction to form highly active (CoFe)OOH, and the current density of 10 mA cm can be achieved at the overpotential of only 118 mV in 1 M KOH aqueous solution. This work helps to understand the role of fluoride during the OER.

Oxygen-vacancy-rich CoO@Fe-B-O heterostructure for efficient oxygen evolution reaction in alkaline and neutral media.

Developing highly efficient OER catalysts is essential for producing hydrogen from water electrolysis to compensate for conventional fossil fuel shortages. Here, the oxygen-vacancy-rich heterostructure grown on the Ni foam (NF) (CoO@Fe-B-O/NF) is fabricated. The synergistic effect between CoO and Fe-B-O has been proven effectively modulate the electronic structure and produce highly active interface sites, ultimately leading to enhanced electrocatalytic activity.

Constructing abundant phase interfaces of the sulfides/metal-organic frameworks p-p heterojunction array for efficient overall water splitting and urea electrolysis.

Designing efficient electrocatalysts to improve the overall water splitting and urea electrolysis efficiency for hydrogen generation can greatly solve the dilemma of energy shortage and environmental pollution. In this work, CoFeS@CoFe-MOF/NF heterojunction arrays were fabricated by embedding sulfides into the surface of metal-organic frameworks (MOFs) nanosheets as multifunctional electrocatalyst. The introduction of sulfide on CoFe-MOF/NF can not only adjust the electronic structure (electron-rich state) and change the surface properties (more hydrophilic), but also increase the active area to enhance the catalytic activity.

Roughness Effect of Cu on Electrocatalytic CO Reduction towards C H.

Electrochemical reduction of CO to produce valuable multi-carbon products is a promising avenue for promoting CO conversion and achieving renewable energy storage, and it has also attracted considerable attention recently. However, the synthesis of Cu electrode with a controllable electrochemical active surface area (ECSA) to understand its role in CO reduction to C H remains challenging. Herein, a series of Cu electrodes with different ECSA is synthesized through a simple oxidation-reduction approach.

Amorphous CoV Phosphate Nanosheets as Efficient Oxygen Evolution Electrocatalyst.

The oxygen evolution reaction (OER) is crucial for hydrogen production. However, OER with four-electron transfer requires electrocatalysts to speed up its sluggish kinetics in alkaline solutions. Herein, amorphous CoV phosphate (denoted as CoV-Pi) nanosheets synthesized by a straightforward one-step hydrothermal approach is reported, which provide a low overpotential of 320 mV at 10 mA cm , a small Tafel slope down to 48.

Three-dimensional self-supporting catalyst with NiFe alloy/oxyhydroxide supported on high-surface cobalt hydroxide nanosheet array for overall water splitting.

The development of available dual-function electrocatalysts is of great significance to the effective storage of excess electricity. Here, we obtained a three-dimensional Co(OH) nanosheet with high surface area on nickel foam (Co(OH)/NF) via conventional hydrothermal. NiFe-coated Co(OH) nanosheet array (NiFe@Co(OH) NSAs/NF) was further constructed by electrodeposition for water splitting.

Preparation of a Dual-MOF Heterostructure (ZIF@MIL) for Enhanced Oxygen Evolution Reaction Activity.

Although metal-organic frameworks have proven to be excellent electrocatalytic materials, their application as electrode materials remains limited. The preparation of heterostructures is considered an effective method to improve catalytic activity. Herein, we describe the design and assembly of a dual-MOF heterostructure (CoNi-ZIF-67@Fe-MIL-100, denoted ZIF@MIL).

Loading FeOOH on Ni(OH) hollow nanorods to obtain a three-dimensional sandwich catalyst with strong electron interactions for an efficient oxygen evolution reaction.

Sustainable production of hydrogen by water splitting requires the exploration of highly efficient electrocatalysts from abundant non-precious metals on Earth. Ni(OH)2 hollow nanorod arrays were obtained on Ni foam by simple alkali etching, and FeOOH was electrodeposited on the walls of hollow nanorods to construct FeOOH@Ni(OH)2 sandwich hollow nanorod arrays, which help overcome the drawbacks of the poor conductivity and poor stability of FeOOH and boost the catalytic performance of the oxygen evolution reaction (OER) in comparison with the individual components. A fully contacted three-dimensional nanorod array structure provides many exposed catalytically active sites and promotes charge transfer during the electrochemical OER process.