Defect-Rich Copper-doped Ruthenium Hollow Nanoparticles for Efficient Hydrogen Evolution Electrocatalysis in Alkaline Electrolyte.
Jiashun LiangLixing ZhuShaoqing ChenCameron PriestXuan LiuHsing-Lin WangGang WuQing LiPublished in: Chemistry, an Asian journal (2020)
It is of great importance to develop highly efficient and stable Pt-free catalysts for electrochemical hydrogen generation from water electrolysis. Here, monodisperse 7.5 nm copper-doped ruthenium hollow nanoparticles (NPs) with abundant defects and amorphous/crystalline hetero-phases were prepared and employed as efficient hydrogen evolution electrocatalysts in alkaline electrolyte. Specifically, these NPs only require a low overpotential of 25 mV to achieve a current density of 10 mA cm-2 in 1.0 M KOH and show acceptable stability after 2000 potential cycles, which represents one of the best Ru-based electrocatalysts for hydrogen evolution. Mechanism analysis indicates that Cu incorporation can modify the electronic structure of Ru shell, thereby optimizing the energy barrier for water adsorption and dissociation processes or H adsorption/desorption. Cu doping paired with the defect-rich and highly open hollow structure of the NPs greatly enhances hydrogen evolution activity.
Keyphrases
- metal organic framework
- oxide nanoparticles
- ionic liquid
- aqueous solution
- room temperature
- highly efficient
- molecularly imprinted
- solid state
- quantum dots
- ion batteries
- gold nanoparticles
- minimally invasive
- anaerobic digestion
- photodynamic therapy
- energy transfer
- electron transfer
- climate change
- high resolution
- risk assessment
- mass spectrometry
- label free