In situ constructing of ultrastable ceramic@graphene core-shell architectures as advanced metal catalyst supports toward oxygen reduction

doi:10.1016/j.jechem.2017.08.012

能源化学(英文) ›› 2017, Vol. 26 ›› Issue (6): 1160-1167.DOI: 10.1016/j.jechem.2017.08.012

In situ constructing of ultrastable ceramic@graphene core-shell architectures as advanced metal catalyst supports toward oxygen reduction

Hui Wu^a,b, Tao Peng^a, Zongkui Kou^a, Kun Cheng^a, Jie Zhang^a, Jian Zhang^a, Tian Meng^a, Shichun Mu^a

a State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China;
b GAC New Energy Automobile Co., Ltd., Guangzhou 511400, Guangdong, China

收稿日期:2017-07-02 修回日期:2017-08-25 出版日期:2017-11-15 发布日期:2017-11-24
通讯作者: Shichun Mu,E-mail address:msc@whut.edu.cn
基金资助:
This research was supported by the National Science Foundation of China (nos. 51372186 and 51672204).

In situ constructing of ultrastable ceramic@graphene core-shell architectures as advanced metal catalyst supports toward oxygen reduction

Hui Wu^a,b, Tao Peng^a, Zongkui Kou^a, Kun Cheng^a, Jie Zhang^a, Jian Zhang^a, Tian Meng^a, Shichun Mu^a

a State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China;
b GAC New Energy Automobile Co., Ltd., Guangzhou 511400, Guangdong, China

Received:2017-07-02 Revised:2017-08-25 Online:2017-11-15 Published:2017-11-24
Contact: Shichun Mu,E-mail address:msc@whut.edu.cn
Supported by:
This research was supported by the National Science Foundation of China (nos. 51372186 and 51672204).

摘要/Abstract

摘要： The changeable structure of 2D graphene nanosheets makes the Pt-based nanoparticles (NPs) possess a low efficiency toward oxygen reduction reaction (ORR) and a short lifetime for proton exchange membrane fuel cells. Thus, a unique TiC@graphene core-shell structure material with low surface energy is designed and prepared by an in situ forming strategy, and firstly applied as a stable support of Pt NPs. The as-prepared Pt/GNS@TiC catalyst presents a high activity. Especially, its ORR stability is remarkably improved. Even after 15000 potential cycles, the half-wave potential and mass activity toward ORR have almost no change. This can be attributed to that the graphene nanosheet existing in a sphere shape effectively avoids the restacking or folding caused by the giant surface tension in 2D graphene nanosheets, impeding the decrease of the triple-phase boundary on Pt NPs. Significantly, the power density of fuel cells with our novel catalyst reaches 853 mV cm^-2 under a low Pt loading (0.25 mgPt cm^-2) and H₂/Air conditions. These indicate the new ceramic@graphene core-shell nanocomposite is a promising application in fuel cells and other fields.

关键词: Graphene, Core-shell, Oxygen reduction, Electrocatalyst, Stability, PEM fuel cell

Abstract: The changeable structure of 2D graphene nanosheets makes the Pt-based nanoparticles (NPs) possess a low efficiency toward oxygen reduction reaction (ORR) and a short lifetime for proton exchange membrane fuel cells. Thus, a unique TiC@graphene core-shell structure material with low surface energy is designed and prepared by an in situ forming strategy, and firstly applied as a stable support of Pt NPs. The as-prepared Pt/GNS@TiC catalyst presents a high activity. Especially, its ORR stability is remarkably improved. Even after 15000 potential cycles, the half-wave potential and mass activity toward ORR have almost no change. This can be attributed to that the graphene nanosheet existing in a sphere shape effectively avoids the restacking or folding caused by the giant surface tension in 2D graphene nanosheets, impeding the decrease of the triple-phase boundary on Pt NPs. Significantly, the power density of fuel cells with our novel catalyst reaches 853 mV cm^-2 under a low Pt loading (0.25 mgPt cm^-2) and H₂/Air conditions. These indicate the new ceramic@graphene core-shell nanocomposite is a promising application in fuel cells and other fields.

Key words: Graphene, Core-shell, Oxygen reduction, Electrocatalyst, Stability, PEM fuel cell

Hui Wu, Tao Peng, Zongkui Kou, Kun Cheng, Jie Zhang, Jian Zhang, Tian Meng, Shichun Mu. In situ constructing of ultrastable ceramic@graphene core-shell architectures as advanced metal catalyst supports toward oxygen reduction[J]. 能源化学(英文), 2017, 26(6): 1160-1167.

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In situ constructing of ultrastable ceramic@graphene core-shell architectures as advanced metal catalyst supports toward oxygen reduction

In situ constructing of ultrastable ceramic@graphene core-shell architectures as advanced metal catalyst supports toward oxygen reduction

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