Ir-skinned Ir-Cu Nanoparticles with Enhanced Activity for Oxygen Reduction Reaction

doi:10.1007/s40242-020-0087-1

高等学校化学研究 ›› 2020, Vol. 36 ›› Issue (3): 467-472.doi: 10.1007/s40242-020-0087-1

Ir-skinned Ir-Cu Nanoparticles with Enhanced Activity for Oxygen Reduction Reaction

WANG Jiarui¹, ZHOU Ye^1,2, SUN Libo^1,2, GE Jingjie¹, WANG Jingxian¹, DAI Chencheng¹, XU Zhichuan^1,2,3

1. School of Materials Science & Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore;
2. Solar Fuels Laboratory, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore;
3. Energy Research Institute@NTU, ERI@N, Interdisciplinary Graduate School, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore

收稿日期:2020-03-31 修回日期:2020-05-05 出版日期:2020-06-01 发布日期:2020-05-04
通讯作者: XU Zhichuan E-mail:xuzc@ntu.edu.sg
基金资助:
Supported by the Project of the Singapore Ministry of Education Tier 2(No.MOE2017-T2-1-009) and the Singapore National Research Foundation Under Its Campus for Research Excellence and Technological Enterprise(CREATE) Programme.

Ir-skinned Ir-Cu Nanoparticles with Enhanced Activity for Oxygen Reduction Reaction

WANG Jiarui¹, ZHOU Ye^1,2, SUN Libo^1,2, GE Jingjie¹, WANG Jingxian¹, DAI Chencheng¹, XU Zhichuan^1,2,3

1. School of Materials Science & Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore;
2. Solar Fuels Laboratory, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore;
3. Energy Research Institute@NTU, ERI@N, Interdisciplinary Graduate School, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore

Received:2020-03-31 Revised:2020-05-05 Online:2020-06-01 Published:2020-05-04
Contact: XU Zhichuan E-mail:xuzc@ntu.edu.sg
Supported by:
Supported by the Project of the Singapore Ministry of Education Tier 2(No.MOE2017-T2-1-009) and the Singapore National Research Foundation Under Its Campus for Research Excellence and Technological Enterprise(CREATE) Programme.

摘要/Abstract

摘要： The development of methanol-tolerate oxygen reduction reaction(ORR) electrocatalysts is of special significance to direct methanol fuel cells system. Iridium is known for its better methanol tolerance than platinum and able to survive in harsh acidic environment. However, its activity is relatively low and thus the approach to improve Ir's ORR is desired. Herein, bimetallic Ir-Cu nanoparticles(NPs) with controllable Ir/Cu compositions(ca. 1:2 to 4:1, atomic ratio) are synthesized via a galvanic replacement-based chemical method. The as-synthesized Ir-Cu NPs are investigated as ORR catalysts after electrochemically leaching out the surface Cu and forming Ir-skinned structures. Around 2- to 3-fold enhancement in the intrinsic activity has been observed in these Ir-skinned Ir-Cu catalysts compared to Ir counterpart. The approach is demonstrated to be a promising way to prepare efficient Ir ORR catalysts and lower catalyst cost.

关键词: Iridium, Copper, Nanoparticle, Dealloying, Oxygen reduction reaction

Abstract: The development of methanol-tolerate oxygen reduction reaction(ORR) electrocatalysts is of special significance to direct methanol fuel cells system. Iridium is known for its better methanol tolerance than platinum and able to survive in harsh acidic environment. However, its activity is relatively low and thus the approach to improve Ir's ORR is desired. Herein, bimetallic Ir-Cu nanoparticles(NPs) with controllable Ir/Cu compositions(ca. 1:2 to 4:1, atomic ratio) are synthesized via a galvanic replacement-based chemical method. The as-synthesized Ir-Cu NPs are investigated as ORR catalysts after electrochemically leaching out the surface Cu and forming Ir-skinned structures. Around 2- to 3-fold enhancement in the intrinsic activity has been observed in these Ir-skinned Ir-Cu catalysts compared to Ir counterpart. The approach is demonstrated to be a promising way to prepare efficient Ir ORR catalysts and lower catalyst cost.

Key words: Iridium, Copper, Nanoparticle, Dealloying, Oxygen reduction reaction

WANG Jiarui, ZHOU Ye, SUN Libo, GE Jingjie, WANG Jingxian, DAI Chencheng, XU Zhichuan. Ir-skinned Ir-Cu Nanoparticles with Enhanced Activity for Oxygen Reduction Reaction[J]. 高等学校化学研究, 2020, 36(3): 467-472.

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Ir-skinned Ir-Cu Nanoparticles with Enhanced Activity for Oxygen Reduction Reaction

Ir-skinned Ir-Cu Nanoparticles with Enhanced Activity for Oxygen Reduction Reaction

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