Enhancing the Catalytic Activity of Tri-iodide Reduction by Tuning the Surface Electronic Structure of PtPd Alloy Nanocrystals

被引：8

作者：

Chou, Keh-Jiunh ^{[1
]}

Chou, Shang-Wei ^{[1
]}

Chen, Deng-Gao ^{[1
]}

Lo, Tzu-Hsuan ^{[1
]}

Shen, Shin-Wei ^{[2
]}

Yang, Ya-Yun ^{[3
]}

Lin, Chink-Yen ^{[3
]}

Chou, Hung-Lung ^{[5
]}

Shyue, Jing-Jong ^{[6
]}

Wu, Chih-I ^{[2
]}

Chou, Pi-Tai ^{[1
,4
]}

机构：

[1] Natl Taiwan Univ, Dept Chem, Taipei 10617, Taiwan

[2] Natl Taiwan Univ, Grad Inst Photon & Optoelect, Taipei 10617, Taiwan

[3] Natl Taiwan Univ, Instrumentat Ctr, Taipei 10617, Taiwan

[4] Natl Taiwan Univ, Ctr Emerging Mat & Adv Devices, Taipei 10617, Taiwan

[5] Natl Taiwan Univ Sci & Technol, Grad Inst Appl Sci & Technol, Taipei 10607, Taiwan

[6] Acad Sinica, Res Ctr Appl Sci, Taipei 11529, Taiwan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2019年 / 123卷 / 20期

关键词：

COUNTER ELECTRODES; LOW-COST; NANOPARTICLES; SHAPE; PLATINUM; SIZE; ELECTROCATALYSTS; NANOSTRUCTURES; NANOCUBES; EXCHANGE;

D O I：

10.1021/acs.jpcc.9b00285

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

PtPd nanocrystals (NCs) with various alloying compositions are strategically prepared through the chemical method and exploited as counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). The photovoltaic results unveil the composition-dependent trend with a volcano-shaped plot of Pt5Pd5 NCs > Pt7Pd3 NCs > Pt3Pd7 NCs > Pt1Pd9 NCs. Among these NCs, the Pt5Pd5 NCs used as CEs in the DSSC exhibit the highest power conversion efficiency (PCE) of 9.8%, which was superior to the PCE of 7.6% obtained from the reference DSSC with the Pt CE in this study. Also, the electrochemical results reveal the composition-dependent activity along with a volcano-shaped trend in the I-/I-3(-) redox reaction. Further theoretical works support that the catalytic activities of I-3(-) reduction follow a sequence of Pt5Pd5(111) surface > Pt7Pd3(111) surface > Pt3Pd7(111) surface > Pt1Pd9(111) surface. The combination of electrochemical and theoretical results thus firmly indicate that the composition of PtPd alloying NCs plays an important role in determining their activities toward the I-3(-) reduction reactions and hence the performance of DSSCs.

引用

页码：12722 / 12729

页数：8

共 43 条

[1] Understanding of the structure activity relationship of PtPd bimetallic catalysts prepared by surface organometallic chemistry and ion exchange during the reaction of iso-butane with hydrogen [J].