Methanol electroreforming coupled to green hydrogen production over bifunctional NiIr-based metal-organic framework nanosheet arrays

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 che...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2022-01, Vol.300, p.120753, Article 120753
Main Authors: Xu, You, Liu, Mengying, Wang, Mingzhen, Ren, Tianlun, Ren, Kaili, Wang, Ziqiang, Li, Xiaonian, Wang, Liang, Wang, Hongjing
Format: Article
Language:English
Subjects:
Arrays
Bifunctional electrocatalysts
Cogeneration
Coupling (molecular)
Electrocatalysts
Electrochemistry
Electrolysis
Energy conservation
Energy conversion
Energy conversion efficiency
Green hydrogen
Hydrogen
Hydrogen evolution
Hydrogen production
Metal foams
Metal-organic frameworks
Metal‐organic framework
Methanol
Methanol electroreforming
Nanosheets
Nickel
Organic chemistry
Oxidation
Oxygen evolution reactions
Water splitting
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Summary: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 H2 and formate generated in 1 M KOH containing 4 M methanol. [Display omitted] •The NiIr-MOF/NF composite was fabricated and served as a bifunctional electrocatalyst.•Replacing OER with MOR could achieve energy-saving electrochemical hydrogen evolution.•Methanol electroreforming at the anode could produce value-added chemical formate.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2021.120753