Research on Performance Decay Mechanism of Pt/C Catalyst in Long‑Term ORR Test

doi:10.19894/j.issn.1000-0518.210574

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (10): 1564-1571.DOI: 10.19894/j.issn.1000-0518.210574

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Research on Performance Decay Mechanism of Pt/C Catalyst in Long‑Term ORR Test

He LI¹^,², Gong LI¹^,², Xue GONG¹, Ming-Bo RUAN¹, Ce HAN¹, Ping SONG¹(), Wei-Lin XU¹^,²()

^1.State Key Laboratory of Electroanalytical Chemistry and Jilin Province Key Laboratory of Low Carbon Chemical Power，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，China
^2.University of Science and Technology of China，Hefei 230026，China

Received:2021-12-21 Accepted:2022-02-23 Published:2022-10-01 Online:2022-10-05
Contact: Ping SONG,Wei-Lin XU
About author:weilinxu@ciac.ac.cn
songping@ciac.ac.cn；
Supported by:
the National Key R&D Program of China(2018YFB1502302);the National Natural Science Foundation of China(22072145)

Abstract

Abstract:

In proton exchange membrane fuel cells， cost， performance and durability are important issues that are need to be resolved before commercialization. The main reason for fuel cell performance degradation during operation is the loss of electrochemical surface area during long-term aging or transient. These losses mainly come from the degradation of the catalyst metal and the corrosion of the carbon support. This is a continuous and irreversible process that will greatly shorten the service life of the fuel cell. In order to explore this problem， 20% （mass fraction） Pt/C catalyst is prepared based on carbon carrier etched by sulfuric acid. The morphology characterization test shows that it is uniformly dispersed and uniform in particle size， which is considered as an excellent material for long-term oxygen reduction （ORR） stability test. Next， the ORR stability test method with different cyclic voltammetry （CV） cycles is used to observe its performance degradation， and a series of physical characterizations， e.g. transmission electron microscopy （TEM）， high-resolution electron microscopy （HRTEM）， X-ray photoelectron spectroscopy （XPS） and Raman spectroscopy （Raman）， are used to further intuitively analyzed the attenuation mechanism. It is reported that the reasons for the degradation of the stability of Pt/C catalysts are mainly from the dissolution， agglomeration， oxidation and migration of Pt particles and the corrosion of carbon supports. This study elucidates the source of the impact on the stability of fuel cells during operation， and provides a reference for designing high-stability commercial ORR catalysts.

Key words: Platinum-carbon catalyst, Oxygen reduction reaction, Stability, Platinum agglomeration, Corrosion of carbon support

CLC Number:

O646

He LI, Gong LI, Xue GONG, Ming-Bo RUAN, Ce HAN, Ping SONG, Wei-Lin XU. Research on Performance Decay Mechanism of Pt/C Catalyst in Long‑Term ORR Test[J]. Chinese Journal of Applied Chemistry, 2022, 39(10): 1564-1571.

Figures/Tables 8

Fig.1 （A） TEM image of Pt/C；（B）Pt/C Pt nanoparticle size distribution diagram；（C） HADDF-SEM image of Pt/C and corresponding element mappings

Fig.2 （A） CV curves under O2 before and after aging；（B） LSV curve after different CV cycles；（C） The relationship between the half-wave potential and the number of CV cycles；（D） The relationship between the limiting current density and the number of CV cycles

Fig.3 TEM images of Pt/C before cycling test （A）， after 1×104 cycles （B）， 2×104 cycles （C）， 3×104 cycles （D）， 4×104 cycles （E） and 5×104 cycles （F）

Fig.4 Pt/C Pt nanoparticle size distribution diagram after 1×104 cycles （A）， 2×104 cycles （B）， 3×104 cycles （C）， 4×104 cycles （D） and 5×104 cycles （E）；（F） The relationship between the number of cycles and the size distribution of Pt nanoparticles

Fig.5 HRTEM images of Pt/C before cycling test （A） and after 5×104 cycles （B）

Fig.6 XPS images of Pt before cycling test （A） and after 1×104 cycles （B） and 3×104 cycles （C） and 5×104 cycles （D）

Fig.7 Under different CV cycles：（A） Histogram of Pt content loss；（B） CV curve under N2；（C） Histogram of calculated ECSA

Fig.8 （A） XPS image of C during the aging cycles；（B） Raman image of Pt/C during the aging cycles

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Research on Performance Decay Mechanism of Pt/C Catalyst in Long‑Term ORR Test

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