Effects of potential range and sweep rate on dissolution of platinum under potential cycling in 0.5 M H2SO4 solution

Y. Sugawara; A. P. Yadav; A. Nishikata; T. Tsuru

doi:10.1149/1.3109639

Effects of potential range and sweep rate on dissolution of platinum under potential cycling in 0.5 M H₂SO₄ solution

Y. Sugawara, A. P. Yadav, A. Nishikata, T. Tsuru

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

7 Citations (Scopus)

Abstract

In this study, the dissolution mechanism of Pt and loss of Electrochemical Surface Area (ECSA) at cathode condition of PEMFC have been clarified by using ICP-Mass and amount of charge of hydrogen under potential deposition (H _upd) respectively. ICP results showed that Pt dissolution was accelerated at potential above 1.0V vs.SHE when potential was cycled at 10 and 100 mVs^-1. Amount of dissolved Pt increased as the sweep rate decreased. P1 dissolved at 10 mVs^-1 was about 2 - 3 times more than that at 100 mVs^-1 in the upper potential limit of 1.2 and 1.4V. This increase of the dissolution can be explained by increase of oxidation time and decrease of the amount of redeposition. On the other hand, H_upd analysis revealed ECSA of Pt didn't change in all potential range at 100 and 1000 mV s^-1, but drastically decreased at 10 mVs^-1. Particularly, ECSA decreased at rate of approximately 40% as compared to that before 100cycles of CV in the potential range 0.0 ∼1.0 or 1.2V at 10 mVs^-1. AFM observation showed that particle grain growth was one of important factor of this surface area loss.

Original language	English
Title of host publication	ECS Transactions - Student Posters - General - 214th ECS Meeting/PRiME 2008
Pages	117-123
Number of pages	7
Edition	24
DOIs	https://doi.org/10.1149/1.3109639
Publication status	Published - 2009
Externally published	Yes
Event	Student Posters - General - 214th ECS Meeting/PRiME 2008 - Honolulu, HI, United States Duration: 2008 Oct 12 → 2008 Oct 17

Publication series

Name	ECS Transactions
Number	24
Volume	16
ISSN (Print)	1938-5862
ISSN (Electronic)	1938-6737

Other

Other	Student Posters - General - 214th ECS Meeting/PRiME 2008
Country/Territory	United States
City	Honolulu, HI
Period	08/10/12 → 08/10/17

ASJC Scopus subject areas

Engineering(all)

Access to Document

10.1149/1.3109639

Cite this

Effects of potential range and sweep rate on dissolution of platinum under potential cycling in 0.5 M H₂SO₄ solution. / Sugawara, Y.; Yadav, A. P.; Nishikata, A. et al.

ECS Transactions - Student Posters - General - 214th ECS Meeting/PRiME 2008. 24. ed. 2009. p. 117-123 (ECS Transactions; Vol. 16, No. 24).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Sugawara, Y, Yadav, AP, Nishikata, A & Tsuru, T 2009, Effects of potential range and sweep rate on dissolution of platinum under potential cycling in 0.5 M H₂SO₄ solution. in ECS Transactions - Student Posters - General - 214th ECS Meeting/PRiME 2008. 24 edn, ECS Transactions, no. 24, vol. 16, pp. 117-123, Student Posters - General - 214th ECS Meeting/PRiME 2008, Honolulu, HI, United States, 08/10/12. https://doi.org/10.1149/1.3109639

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AB - In this study, the dissolution mechanism of Pt and loss of Electrochemical Surface Area (ECSA) at cathode condition of PEMFC have been clarified by using ICP-Mass and amount of charge of hydrogen under potential deposition (H upd) respectively. ICP results showed that Pt dissolution was accelerated at potential above 1.0V vs.SHE when potential was cycled at 10 and 100 mVs-1. Amount of dissolved Pt increased as the sweep rate decreased. P1 dissolved at 10 mVs-1 was about 2 - 3 times more than that at 100 mVs-1 in the upper potential limit of 1.2 and 1.4V. This increase of the dissolution can be explained by increase of oxidation time and decrease of the amount of redeposition. On the other hand, Hupd analysis revealed ECSA of Pt didn't change in all potential range at 100 and 1000 mV s-1, but drastically decreased at 10 mVs-1. Particularly, ECSA decreased at rate of approximately 40% as compared to that before 100cycles of CV in the potential range 0.0 ∼1.0 or 1.2V at 10 mVs-1. AFM observation showed that particle grain growth was one of important factor of this surface area loss.

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