期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 300, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120753
关键词
Hydrogen production; Methanol electroreforming; Bifunctional electrocatalysts; Metal-organic framework; Nanosheets
资金
- National Natural Science Foundation of China [21601154, 21701141, 21972126, 21978264, 21905250]
The study utilized NiIr-MOF/NF as a bifunctional self-supported electrocatalyst to achieve the combined reactions of methanol oxidation and hydrogen production, effectively enabling water electrolysis with low voltage and high current density.
The conventional water electrolysis system is seriously restricted by the sluggish kinetics of anodic oxygen evolution reaction. Electroreforming of organic substances coupling with electrochemical hydrogen evolution is an innovative strategy to achieve energy-saving co-generation of value-added chemicals and hydrogen. Herein, NiIr-based metal-organic framework (MOF) nanosheet arrays are in situ grown on Ni foam (NiIr-MOF/NF) and employed as a bifunctional self-supported electrocatalyst to oxidize small organic molecules of methanol to the value-added chemical formate while efficiently facilitating hydrogen production. The constructed co-electrolytic system based on HER-methanol oxidation reaction (MOR) bifunctional NiIr-MOF/NF electrocatalyst possesses ultra-high energy conversion efficiency for electrochemically assisted overall water splitting, with a low cell voltage of only 1.39 V to achieve the current density of 10 mA cm(-2). Especially, the Faradaic efficiencies of the cathode and anode could both reach nearly 100% for H-2 and formate generated in 1 M KOH containing 4 M methanol.
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