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PANI-modified Pt/Na4Ge9O20 with low Pt loadings: Efficient bifunctional electrocatalyst for oxygen reduction and hydrogen evolution.

Authors :
Wang, Min
Jiang, Luhua
Li, Qinru
Zhou, Xiaoxia
Source :
International Journal of Hydrogen Energy. Nov2019, Vol. 44 Issue 59, p31062-31071. 10p.
Publication Year :
2019

Abstract

Exploring cost-effective electrocatalysts for the oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) have been a goal in the sustainable hydrogen-based society. Although abundant of alternative materials have been developed, Pt/C remains the most efficient electrocatalyst for the ORR and HER. Nevertheless, improving the stability and reducing Pt loading for Pt-based electrocatalysts are still big challenges. Herein, semiconductor crystals Na 4 Ge 9 O 20 with richer topology structure was chosen as electrocatalyst support, subsequently, the conductive polymer polyaniline (PANI) was decorated on semiconductor Na 4 Ge 9 O 20 , low-content Pt nanoparticles (Pt NPs) with the size of 1–3 nm were then uniformly anchored on the surface of Na 4 Ge 9 O 20 -PANI to obtain the efficient bifunctional electrocatalyst for ORR and HER in the acidic solution. More importantly, the stability and mass activity of the obtained electrocatalyst 5 wt% Pt/Na 4 Ge 9 O 20 -PNAI are significantly higher than that of commercial 20 wt% Pt/C for ORR and HER. It was proposed that the PANI could not only promote the electron transfer from Na 4 Ge 9 O 20 to Pt, but also stabilize the Pt NPs, thus, improving the electrocatalytic activity and stability of 5 wt% Pt/Na 4 Ge 9 O 20 -PNAI. • Low-content Pt nanoparticles with the size of 1–3 nm were uniformly anchored on the Na 4 Ge 9 O 20 -PANI. • The 5 wt% Pt/Na 4 Ge 9 O 20 -PANI afforded super electrocatalytic performance for HER and ORR. • The HER and ORR mass activities of the Pt/Na 4 Ge 9 O 20 -PNAI is about 3.5 and 2.7 times that of the commercial Pt/C. • The current density of Pt/Na 4 Ge 9 O 20 -PNAI is nearly unchanged in 20 h in HER. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
03603199
Volume :
44
Issue :
59
Database :
Academic Search Index
Journal :
International Journal of Hydrogen Energy
Publication Type :
Academic Journal
Accession number :
139707169
Full Text :
https://doi.org/10.1016/j.ijhydene.2019.10.021