Citation: Zihao Li, Xianggui Zhou, Subhash Singh, Xiaoming Wei, Chunlei Guo, Weishan Li. Degradation of platinum electrocatalysts for methanol oxidation by lead contamination[J]. Chinese Chemical Letters, ;2023, 34(2): 107230. doi: 10.1016/j.cclet.2022.02.035 shu

Degradation of platinum electrocatalysts for methanol oxidation by lead contamination

Zihao Li ^{a, b} ,
Xianggui Zhou ^c ,
Subhash Singh ^b ,
Xiaoming Wei ^{a, *,} ,
Chunlei Guo ^{b, *,} ,
Weishan Li ^{b, c, *,}

a.
School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
b.
The Institute of Optics, University of Rochester, Rochester, New York 14627, United States
c.
School of Chemistry, South China Normal University, Guangzhou 510006, China

weixmingopt@gmail.com

guo@optics.rochester.edu

liwsh@scnu.edu.cn

Received Date: 5 January 2022
Revised Date: 30 January 2022
Accepted Date: 15 February 2022
Available Online: 19 February 2022

Figures(4)

Platinum exhibits high electrocatalytic activity toward various reactions but might be poisoned by some species. This communication reports a new finding that the electrocatalytic activity of platinum for methanol oxidation will be largely lost in a lead-contaminated environment. This activity loss is demonstrated in an electrochemical cell using a lead counter electrode for measuring the activity of platinum electrode towards methanol oxidation. The recorded methanol oxidation current in this cell is significantly decreased compared with that using a platinum counter electrode. The possible mechanism is related to the adsorption of trace lead ions from the lead counter electrode, as confirmed by comparing the calculated binding energies of platinum and lead ions with oxygen ion. This report is of great importance for reliably designing and efficiently managing direct methanol fuel cells, because trace lead might be present in various components in the fuel cell systems or in air and attention should be paid to its negative effect.
- Activity degradation,
- Platinum electrocatalyst,
- Lead contamination,
- Methanol oxidation,
- Binding energy
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