Electrochemical synthesis of Pt-decorated Au dendrite anode for constructing a direct formic acid fuel cell. (December 2022)

• Record Type: Journal Article
• Authors: Hong, S.; Kim, H.; Kim, J.; Kim, S.Y.; Ahn, S.H.
• Is Part Of: Materials today chemistry. Volume 26(2022)
• Publication Date: 2022-12
• Subjects: Formic acid oxidation reaction -- Gas diffusion electrode -- Low Pt loading -- Electrodeposition; PEMFCs polymer electrolyte membrane fuel cells -- OCP open circuit potential -- DFAFCs direct formic acid fuel cells -- FAOR formic acid oxidation reaction -- SED self-terminated electrodeposition -- CP carbon paper -- FFT fast Fourier transform -- EDS energy dispersive spectroscopy -- CV cyclic voltammetry -- RHE reversible hydrogen electrode -- ECSA electrochemical surface area -- DOS density of states -- MEA membrane electrode assembly -- SCE saturated calomel electrode -- RF roughness factor; Chemistry -- Periodicals; Materials -- Research -- Periodicals; Materials science -- Periodicals; Chemistry; Materials -- Research; Electronic journals; Periodicals; 660.282
• DOI: 10.1016/j.mtchem.2022.101162
• Languages: English
• ISSNs: 2468-5194

Abstract

Abstract: Scale-up fabrication of electrodes using a facile method is a challenge for the commercialization of direct formic acid fuel cells (DFAFCs). Herein, we report the facile fabrication of a Pt-decorated Au dendrite (Pt@Au-D) anode for DFAFCs. The Au dendrite was prepared by the galvanic displacement of Au on Ni-deposited carbon paper (CP) with a geometrical area of 10.2 cm 2 . The Pt islands were then electrodeposited on the Au dendrite with an extremely low Pt loading of 9.6 ± 0.1 μgPt /cm 2 . The Pt@Au-D/CP showed a current density of 27.1 mA/cm 2 at 0.5 VRHE in an electrolyte consisting of 0.5 M HCOOH +0.5 M H2 SO4, which was higher than those of state-of-art Pt–Au catalysts. Pt@Au-D/CP was employed as the anode for a DFAFC single cell coupled with a commercial Pt/C/CP cathode. The DFAFC single cell demonstrated a current density of 67.6 mA/cm 2 at 0.4 Vcell and a maximum power density of 65.2 mW/cm 2 . Compared with state-of-the-art Pt–Au anodes, the Pt@Au-D/CP anode exhibited superior mass activity. Graphical abstract: Image 1 Highlights: Pt-decorated Au dendrites were directly fabricated on a 10.24 cm 2 of gas diffusion layer. Nine sections of the fabricated electrode exhibited uniform coverage. The dendrites had an extremely low Pt loading of 9.6 μg/cm 2 . Pt-decorated Au dendrites exhibited higher geometric FAOR activity than the state-of-art Pt–Au catalyst. The mass maximum power density obtained by single cell test was 6791.7 mW/mgPt .