A Highly-Efficient Boron Interstitially Inserted Ru Anode Catalyst for Anion Exchange Membrane Fuel Cells.
Pengyu HanXinyi YangLiqing WuHongnan JiaJingchao ChenWenwen ShiGongzhen ChengWei LuoPublished in: Advanced materials (Deerfield Beach, Fla.) (2023)
Developing high-performance electrocatalysts for alkaline hydrogen oxidation reaction (HOR) is crucial for the commercialization of anion exchange membrane fuel cells (AEMFCs). Here, boron interstitially inserted ruthenium (B-Ru/C) has been synthesized and used as an anode catalyst for AEMFC, achieving a peak power density of 1.37 W cm -2 , close to the state-of-the-art commercial PtRu catalyst. Unexpectedly, instead of the monotonous decline of HOR kinetics with pH as generally believed, an inflection point behavior in the pH-dependent HOR kinetics on B-Ru/C is observed, showing an anomalous behavior that the HOR activity under alkaline electrolyte surpasses acidic electrolyte. Experimental results and density functional theory calculations reveal that the upshifted d-band center of Ru after the intervention of interstitial boron could lead to enhanced adsorption ability of OH and H 2 O, which together with the reduced energy barrier of water formation, contributes to the outstanding alkaline HOR performance with a mass activity of 1.716 mA μg PGM -1 , which is 13.4-fold and 5.2-fold higher than that of Ru/C and commercial Pt/C, respectively. This article is protected by copyright. All rights reserved.
Keyphrases
- ionic liquid
- highly efficient
- density functional theory
- reduced graphene oxide
- induced apoptosis
- ion batteries
- room temperature
- energy transfer
- cell cycle arrest
- molecular dynamics
- visible light
- randomized controlled trial
- anaerobic digestion
- endoplasmic reticulum stress
- genome wide
- carbon dioxide
- dna methylation
- single cell
- molecular dynamics simulations