Amorphous FeNiCu-MOFs as highly efficient electrocatalysts for the oxygen evolution reaction in an alkaline medium.
Hao WuQingxi ZhaiFan DingDongyue SunYujie MaYilun RenBiao WangFengqi LiHaifeng BianYurong YangLan ChenShaochun TangXiangkang MengPublished in: Dalton transactions (Cambridge, England : 2003) (2022)
The preparation of low-cost and high-activity oxygen evolution reaction (OER) catalysts is a technical bottleneck in the field of electrolysis of water to produce hydrogen. Amorphous metal-organic frameworks (MOFs) with low-cost transition metals have attracted increasing attention in the catalytic field, yet metal atoms that are the main active sites are still ambiguous. Here, we synthesized a series of amorphous ternary Fe x (NiCu) 3- x -MOFs via an ultrasonic method. The optimal amorphous FeNiCu-MOF is found to be able to supply a current density of 10 mA cm -2 merely at a low overpotential of 260 mV with a small Tafel slope of 61 mV dec -1 and exhibits high durability over 24 h. Moreover, density functional theory (DFT) calculations show that the Fe atoms are the main active sites for the OER in the FeNiCu-MOF. This work shows that amorphous ternary MOFs have great potential for application in OER electrocatalysts due to the multiple synergistic effects and amorphous MOF structures.
Keyphrases
- metal organic framework
- low cost
- density functional theory
- room temperature
- highly efficient
- molecular dynamics
- solid state
- preterm infants
- high resolution
- human health
- risk assessment
- working memory
- molecular dynamics simulations
- molecular docking
- cancer therapy
- gold nanoparticles
- climate change
- molecularly imprinted
- drinking water
- drug delivery
- health risk
- heavy metals
- tandem mass spectrometry
- anaerobic digestion