题 目:Synergistic Effffect of Nickel Oxyhydroxide and Tungsten Carbide in Electrocatalytic Alcohol Oxidation
作 者:Mengrui Zhang, Jianping Zhu, Rong Wan, Bin Liu, Dongdi Zhang, Chao Zhang,* Jingping Wang, and Jingyang Niu*
刊 名:Chem. Mater.
年卷页:2022, 34, 959-969
影响因子：9.811
摘 要：Design and synthesis of effiffifficient small organic molecule-based electrooxidation catalysts in replacing conventional oxygen evolution reaction (OER) catalysts has been considered as an alternative path to enable large scale renewable energy storage. In contrast to OER, alcohol oxidation reactions can be implemented at lower applied potentials along with generating higher value-added byproducts than oxygen. Here, the ultrafifine Ni/WC hybrid nanoparticles (NPs) were successfully synthesized via an in situ trapping and space-confifinement pyrolysis strategy. The as-synthesized Ni/WC hybrid NPs exhibit high electrooxidation performances in oxidizing methanol, ethanol, iso-propanol, ethylene glycol, and propylene glycol in alkaline solution. Particularly, for the methanol oxidation reaction, Ni/WC NPs demonstrate high reaction activity (specifific activity: 325 mA cm−2 at 0.6 V vs Ag/AgCl/3.5 M KCl; mass activity: 1363 mA mg−1) and excellent stability (catalytic current drops ∼6.8% after 4 h). In the fifirst 6 h of the electrolysis process, methanol was effffectively converted into formate with ca. 93.8% Faraday effiffifficiency. Based on in situ IR spectra and control catalyst experiments, tungsten carbide (WC) and nickel oxyhydroxide (NiOOH, derived from Ni) species are capable of activating difffferent functional groups of methanol. More interestingly, their hybrid structure (Ni/WC) demonstrates improved catalytic performance in converting methanol into a formate product for the synergistic effffect.
