Electronic Modulation of Ru Nanosheet by d-d Orbital Coupling for Enhanced Hydrogen Oxidation Reaction in Alkaline Electrolytes.
Yunbo LiChaoyi YangChuangxin GeNa YaoJinlong YinWenyong JiangHengjiang CongGongzhen ChengWei LuoLin ZhuangPublished in: Small (Weinheim an der Bergstrasse, Germany) (2022)
The alkaline polymer electrolyte fuel cells (APEFCs) hold great promise for using nonnoble metal-based electrocatalysts toward the cathodic oxygen reduction reaction (ORR), but are hindered by the sluggish anodic hydrogen oxidation reaction (HOR) in alkaline electrolytes. Here, a strategy is reported to promote the alkaline HOR performance of Ru by incorporating 3d-transition metals (V, Fe, Co, and Ni), where the conduction band minimum (CBM) level of Ru can be rationally tailored through strong d-d orbital coupling. As expected, the obtained RuFe nanosheet exhibits outstanding HOR performance with the mass activity of 233.46 A g PGM -1 and 23-fold higher than the Ru catalyst, even threefold higher than the commercial Pt/C. APEFC employing this RuFe as anodic catalyst gives a peak power density of 1.2 W cm -2 , outperforming the documented Pt-free anodic catalyst-based APEFCs. Experimental results and density functional theory calculations suggest the enhanced OH-binding energy and reduced formation energy of water derived from the downshifted CBM level of Ru contribute to the enhanced HOR activity.
Keyphrases
- ionic liquid
- visible light
- density functional theory
- room temperature
- energy transfer
- electron transfer
- metal organic framework
- molecular dynamics
- anaerobic digestion
- highly efficient
- induced apoptosis
- carbon dioxide
- ion batteries
- solid state
- hydrogen peroxide
- molecular dynamics simulations
- cell death
- machine learning
- cell cycle arrest
- health risk
- nitric oxide
- risk assessment
- smoking cessation
- quantum dots
- endoplasmic reticulum stress
- heavy metals
- dna binding