Abstract
Hydrogen has been considered as a promising alternative energy to replace fossil fuels. Electrochemical water splitting, as a green and renewable method for hydrogen production, has been drawing more and more attention. In order to improve hydrogen production efficiency and lower energy consumption, efficient catalysts are required to drive the hydrogen evolution reaction (HER). Cobalt (Co)-based metal-organic frameworks (MOFs) are porous materials with tunable structure, adjustable pores and large specific surface areas, which has attracted great attention in the field of electrocatalysis. In this review, we focus on the recent progress of Co-based metal-organic frameworks and their derivatives, including their compositions, morphologies, architectures and electrochemical performances. The challenges and development prospects related to Co-based metal-organic frameworks as HER electrocatalysts are also discussed, which might provide some insight in electrochemical water splitting for future development.
Highlights
With the rapid development of economy, energy and environmental problems have raised increasing concerns in recent years (Su et al, 2019; Lin et al, 2020; Liu H. et al, 2020; Liu S. et al, 2020b)
Co-metal-organic frameworks (MOFs), showing excellent performance for the hydrogen evolution reaction (HER), has sprung up due to its intriguing advantages: (1) Co metal has a proper binding energy for hydrogen atom (Jin et al, 2015; Huang et al, 2017); (2) the porosity of MOFs can improve the exposure of active sites and electron/mass transfer (Jia et al, 2017; Wang X. et al, 2020); (3) the organic linkers can serve as the source of N-doping which facilitates to maximize conductivity of carbon matrix (Li D. et al, 2018; Weng et al, 2018)
We present an overview of Co-based MOFs for HER in the past few years
Summary
With the rapid development of economy, energy and environmental problems have raised increasing concerns in recent years (Su et al, 2019; Lin et al, 2020; Liu H. et al, 2020; Liu S. et al, 2020b). Cobalt (Co)-based metal-organic frameworks (MOFs) are porous materials with tunable structure, adjustable pores and large specific surface areas, which has attracted great attention in the field of electrocatalysis. Regulating the electronic structure of catalysts could increase the intrinsic activity, such as heteroatom doping (Liu et al, 2015; Nan et al, 2019; Liu H. et al, 2020), defect engineering (Yilmaz et al, 2018), alloying
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