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High Mass and Specific Activity for Ammonia Electro-oxidation through Optimization of Dispersion Degree and Particle Size of Pt-Ir Nanoparticles over N-Doped Reductive Graphene Oxide

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论文类型: 期刊论文

第一作者: Zhou, Yufei

通讯作者: Zhang, GQ (reprint author), Dalian Univ Technol, Sch Environm Sci & Technol, China Minist Educ, Key Lab Ind Ecol & Environm Engn, Dalian 116024, Liaoning, Peoples R China.

合写作者: Zhang, Guoquan,Yu, Mingchuan,Xu, Jing,Qiao, Sha,Cheng, Xue,Yang, Fenglin

发表时间: 2018-03-29

发表刊物: CHEMISTRYSELECT

收录刊物: SCIE

卷号: 3

期号: 12

页面范围: 3433-3443

ISSN号: 2365-6549

关键字: ammonia electro-oxidation; bimetallic nanoparticles; mass and specific activity; N-doped graphene; platinum-iridium

摘要: Platinum and iridium co-supported on N-doped reductive graphene oxide (N-rGO) electrocatalysts (Pt-Ir/N-rGO) were synthesized and investigated for ammonia electro-oxidation reaction (AOR) in alkaline media. Pt and Ir particles were deposited over the N-rGO substrate through a potentiodynamic electrodeposition method. The deposition parameters, lower potential limit (E-L) and scan rate, play a vital role on the dispersion degree and particle size of Pt-Ir bimetallic nanoparticles over N-rGO. Additionally, the comparable current densities and a better poisoning inhibition are obtained compared to the commercial Pt (20 wt%)/C indicating that a synergistic effect among Pt, Ir and N-rGO substrate is existing in favour on the electrocatalytic activity. The N-rGO substrate with more active sites, higher excellent electrochemical activity and well dispersion for Pt and Ir particles anchoring is a suitable substrate for AOR and would be extended to other catalytic reactions.

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