Ultrafine Co₆W₆C as an efficient anode catalyst for direct hydrazine fuel cells

Abstract

Ultrafine ternary carbide Co6W6C@C nanoparticles (NPs) were successfully synthesized and these NPs exhibited high catalytic activities for hydrazine oxidation reaction (HzOR) under alkaline conditions. In a practical O2-hydrazine fuel cell...

Understanding hydrazine oxidation electrocatalysis on undoped carbon

“…DFT calculations further identify the most likely catalytic sites in molecular detail. Based on these findings, we now reveal that the 'double wave' phenomenon, often observed in HzOR electrocatalysis on carbon-based materials, 19,22,28,33,42,[59][60][61][62][63] is due to the secondary yet powerful contribution of undoped carbon sites. Overall, the carbon matrix is found to play a larger role in hydrazine oxidation electrocatalysis than previously assumed.…”

“…Many doped carbons studied as HzOR electrocatalysts show a puzzling voltammetric signature in alkaline, consisting of two oxidation waves. 19,22,28,33,42,[59][60][61][62][63] While the first wave is correlated with the introduction of specific dopants (e.g. Fe or N), the second wave remains a topic of debate.…”

Synergistic Effect of Nickel Oxyhydroxide and Tungsten Carbide in Electrocatalytic Alcohol Oxidation

“…Our previous work has proved that incorporating Mo/W-based polyoxometalates (POMs) into ZIF’s cavities followed by pyrolysis is an effective method to transform nanosized POMs into Mo/W-based ultrafine nanoparticles (NPs). , In this work, SiW 9 Ni 3 was chosen as the precursor where Ni and W sites are interconnected through O-bridges. Thus, the transformation from POM to Ni/WC NPs is expected to lead to hybridization between Ni and W species.…”

Rapid Access to γ,γ‐Dichloroketones via Radical‐Induced Dichloromethylation and Concomitant 1,2‐Aryl Migration of Allylic Alcohols with CHCl3

“…They proposed that α‐amino radicals are key intermediates in the reaction. Recently, our group reported a base‐tuned selective 1,2‐dichloromethylhydroxylation and 1,2‐peroxyhydroxylation of 1,3‐dienes via tandem radical process [15d] . Herein, we would like to report a dichloromethylation‐initiated radical 1,2‐aryl migration in allylic alcohols 1 , leading to a wide variety of γ,γ‐dichloroketones 3 , and chlorocyclopropanes 4 could be obtained from allyl alcohols in one‐pot manner through radical‐addition/1,2‐aryl migration/nucleophilic substitution (Scheme 1b).…”