H₂O₂‐Assisted Synthesis of Porous N‐Doped Graphene/Molybdenum Nitride Composites with Boosted Oxygen Reduction Reaction

Abstract

Nonprecious metal (NPM) catalysts are considered as the most promising candidate to replace Pt‐based electrocatalysts for oxygen reduction reaction (ORR). However, in comparison with the commercial Pt catalyst, the development of high efficiency and low cost NPM catalysts for ORR still remains a big challenge. Here, a simple but efficient way to fabricate porous N‐doped graphene immobilized molybdenum nitride (MoN) nanoparticles is reported, and simultaneously, the introduction of H2O2 plays a key role in modulating the particle size of MoN and the microstructure of the composite to achieve different configuration. As results, it is shown that the as‐prepared material owns outstanding ORR activity and excellent stability in an alkaline medium. To the best knowledge, this catalyst possesses the best performance among the same class catalysts as reported. It is believed that the H2O2‐assisted strategy can provide new insights in synthesis of high efficient metal nitride/carbon hybrid materials toward advanced energy conversion and storage.

Mechanochemical‐Assisted Synthesis of High‐Entropy Metal Nitride via a Soft Urea Strategy

“…Metal nitrides, a large class of metal compounds where nitrogen has a formal oxidation state of ‐3, have received great attention owing to their high chemical stability and physical properties including hardness, thermal stability, and electrical conductivity . Every early transition‐metal nitride exhibits its own unique properties, which would certainly extend to a wider range of properties when synthesizing these materials with a combination of transition metals.…”

Robust MOF-253-derived N-doped carbon confinement of Pt single nanocrystal electrocatalysts for oxygen evolution reaction

“…There is an imminent need to improve catalytic activity and stability by using low dosages of catalysts, and adhering to design simplicity and green technology. To achieve these objectives, various electrocatalytic materials with different structures and chemical compositions including noble metals [1,2], low-cost earth-abundant transition metals [3][4][5], and even metal-free [6][7][8] materials have been broadly explored as alternative electrocatalysts for various electrochemi-cal applications. Platinum-based materials have played a particularly significant role in this area due to their high activities toward the oxygen reduction reaction (ORR) in fuel cells [9,10] and the hydrogen evolution reaction (HER) in electrolyzers [11,12].…”

Nanocarbon-based catalysts for esterification: Effect of carbon dimensionality and synergistic effect of the surface functional groups

“…Despite excellent catalytic activities, the preparations of these above catalysts always need too much concentrated sulfuric acid and complicated process. Among all the carbon materials, graphene has attracted much research interest owing to its excellent thermal and mechanical stability, extraordinary electrical conductivity, high surface area and ultra-high degree of exposure of active sites, endowing it a promising catalyst carrier with ultra-high accessibility of catalytic active sites [29][30][31][32][33]. The most commonly used scalable approach for preparation of graphene involves graphite oxidation to form GO and reduction to yield reduced graphene oxide (RGO or graphene) [25,[34][35][36].…”