Electron transfer and surface activity of NiCoP-wrapped MXene: cathodic catalysts for the oxygen reduction reaction

Abstract

MXene@NiCoP was prepared with sufficient active sites and efficient cathodic oxygen diffusion for the ORR. The MXene enhanced the electron transfer and surface activity of NiCoP, resulting in low overpotential and high OH* adsorption energy.

Bimetallic CoSn nanoparticles anchored on N-doped carbon as antibacterial oxygen reduction catalysts for microbial fuel cells

“…The four-electron ORR mechanism directly reduced O 2 into H 2 O, improving the reaction efficiency. 34 CoSn@NC showed an HO 2 − percentage of about 20.7% and an electron number of about 3.6, while those of Sn@NC were about 13.5% and 3.8, respectively (Fig. 5i).…”

“…1c). 34 Three models of Co@NC, Sn@NC and CoSn@NC were established to simulate the ORR process and explore the synergistic mechanism of bimetallic CoSn nanoparticles (Fig. S3†).…”

“…The adsorption energy (Δ E ) was defined as:Δ E = E T − E O 2 where E T is the initial energy of substrates and E O 2 is the energy of O 2 . 34…”

Recent Advances with Biomass‐Derived Carbon‐Based Catalysts for the High‐Efficiency Electrochemical Reduction of Oxygen to Hydrogen Peroxide

“…The oxygen reduction reaction (ORR) is a reduction that takes place at the cathode, and is a complex process involving multiple electron transfer processes and reaction intermediates. [32] In ORR, O 2 molecules can be reduced directly to H 2 O via a fourelectron (4e À ) or follow a two-electron (2e À ) pathway to form H 2 O 2 . Since H 2 O is the thermodynamically favored product, producing H 2 O 2 is an obstacle through 2e À ORR pathway.…”

Ammonia-assisted synthesis of low-crystalline FeCo hydroxides for efficient electrochemical overall water splitting

“…Although electrocatalysts such as Pt, Ru, and Ir are effective at producing hydrogen through water electrolysis, their widespread use is restricted due to their limited availability and poor catalytic durability. 5,24–27 Under alkaline conditions, transition metal (Fe, Co, and Ni) sulfides, oxides, phosphides, nitrides, and selenides have shown promising catalytic performance for the electrolysis of water to produce hydrogen, 6,28–34 with FeNi LDH being reported as the most excellent anode catalyst. 35 However, their high synthetic cost poses a great challenge for industrialization.…”