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

Jiarui Wang; Ye Zhou; Libo Sun; Jingjie Ge; Jingxian Wang; Chencheng Dai; Zhichuan Xu

doi:10.1007/s40242-020-0087-1

Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (3) : 467 -472. DOI: 10.1007/s40242-020-0087-1

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

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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.

Keywords

Iridium / Copper / Nanoparticle / Dealloying / Oxygen reduction reaction

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Jiarui Wang, Ye Zhou, Libo Sun, Jingjie Ge, Jingxian Wang, Chencheng Dai, Zhichuan Xu. Ir-skinned Ir-Cu Nanoparticles with Enhanced Activity for Oxygen Reduction Reaction. Chemical Research in Chinese Universities, 2020, 36(3): 467-472 DOI:10.1007/s40242-020-0087-1

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