Bifunctional Pt-SnOxnanorods for enhanced oxygen reduction and hydrogen evolution reactions

Tzu Hsi Huang, Dinesh Bhalothia, Sheng Dai, Che Yan, Kuan Wen Wang, Tsan Yao Chen

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The composition and configuration are the deciding factors for catalytic properties and are constrained by the physical nature of the selected elements, thereby influencing the functionality of heterogeneous catalysts. In view of this, herein, a one-dimensional bifunctional heterogeneous nanocatalyst consisting of SnO2capped Pt nanorods (Pt-SnOxNRs) is developedviathe formic acid reduction method (FAM), showing high oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) performance. The performance of the as-prepared Pt-SnOxNRs was 1.4-fold higher than that of the commercial J.M.-Pt/C catalyst with an outstanding mass activity (MA) of 160 mA mgPt−1at 0.85 Vvs.SHE towards the ORR in acidic medium. Of special relevance, these Pt-SnOxNRs exhibit notable stability and retained 87% of their initial MA when operated up to 5k cycles in an accelerated durability test (ADT) in the ORR. Moreover, the Pt-SnOxNRs achieved a remarkably lower overpotential (η) of 48 mV (at a current density of 10 mA cm−2) and a Tafel slope of 33 mV dec−1in the HER, significantly lower than those of the commercial J.M.-Pt/C catalyst (η= 60 mV and Tafel slope = 38 mV dec−1). Besides, such a material maintained its 100% HER activity in a chronoamperometric (CA) stability test up to 6 h. By cross-referencing the results of structural and electrochemical inspections, such a high bifunctional performance of Pt-SnOxNRs is attributed to the synergistic collaboration between the SnO2modifier and Pt atoms. The SnO2accelerates the HO-H bond cleavage during the HER and simultaneously promotes the desorption of oxygen species on the Pt surface in the ORR, which later triggers the reduction reaction performance. Meanwhile, SnO2provides a shielding effect to Pt under harsh reduction conditions and thus high stability of Pt-SnOxNRs is achieved.

Original languageEnglish
Pages (from-to)2960-2971
Number of pages12
JournalSustainable Energy and Fuels
Volume5
Issue number11
DOIs
StatePublished - 7 Jun 2021

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