Performance of direct ammonia fuel cell with PtIr/C, PtRu/C, and Pt/C as anode electrocatalysts under mild conditions. (5th August 2021)

• Record Type: Journal Article
• Authors: Chen, Riyi; Zheng, Songsheng; Yao, Yudong; Lin, Zhibin; Ouyang, Wei; Zhuo, Lianghui; Wang, Zhaolin
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 54(2021)
• Page Start: 27749
• Page End: 27757
• Publication Date: 2021-08-05
• Subjects: Direct ammonia fuel cell -- Anode electrocatalyst -- Ammonia oxidation -- Hydrogen carrier; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.06.001
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: While ammonia (NH3 ) is an attractive alternative to pure hydrogen, its direct use in fuel cells is fraught with difficulties. A direct ammonia fuel cell (DAFC) with PtIr/C (Pt:Ir = 1:1), PtRu/C (Pt:Ru = 1:1), and Pt/C anode electrocatalyst was investigated at 25 °C and 100 kPa inlet gas pressure. Due to the synergistic and electronic effects of the PtIr alloy, their open-circuit voltages (OCVs) were rated as PtIr/C > PtRu/C > Pt/C, with the DAFC with PtIr/C anode achieving the highest OCV of 0.50 V and peak power density (PPD) of maximum 1.68 mW cm −2 . Meanwhile, an online Fourier transform infrared (FTIR) spectrometer detected an increase in ammonia permeation in the cathode exhaust gas, indicating a possibility of fuel permeation and cathode electrocatalyst degradation. The degradation of DAFC efficiency with rising cycle numbers may be due to ammonia cross-over and poisoning over the surface of the electrocatalyst. Highlights: Electrocatalysts (PtIr, PtRu, Pt)/C on direct ammonia fuel cell was evaluated. The highest OCV of 0.50 V and peak power density of 1.68 mW cm −2 were achieved. The FTIR analyzer was first reported for the ammonia permeability measurement.