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  • 研究员
  • 博士生导师
  • 硕士生导师
  • 教师英文名称:Yarong Zheng
  • 教师拼音名称:zhengyarong
  • 电子邮箱:
  • 所在单位:化学系
  • 职务:化学系系主任
  • 学历:研究生(博士)毕业
  • 办公地点:昇华楼301
  • 性别:
  • 学位:博士学位
  • 在职信息:在职
  • 毕业院校:中国科学技术大学
  • 学科:无机化学
    物理化学
    材料学
    应用化学
论文成果
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Monitoring oxygen production on mass-selected iridium–tantalum oxide electrocatalysts
  • 发表刊物:Nat. Energy
  • 摘要:Development of low-cost and high-performance oxygen evolution reaction catalysts is key to implementing polymer electrolyte membrane water electrolysers for hydrogen production. Iridium-based oxides are the state-of-the-art acidic oxygen evolution reaction catalysts but still suffer from inadequate activity and stability, and iridium's scarcity motivates the discovery of catalysts with lower iridium loadings. Here we report a mass-selected iridium–tantalum oxide catalyst prepared by a magnetron-based cluster source with considerably reduced noble-metal loadings beyond a commercial IrO2 catalyst. A sensitive electrochemistry/mass-spectrometry instrument coupled with isotope labelling was employed to investigate the oxygen production rate under dynamic operating conditions to account for the occurrence of side reactions and quantify the number of surface active sites. Iridium–tantalum oxide nanoparticles smaller than 2 nm exhibit a mass activity of 1.2 ± 0.5 kA gIr–1 and a turnover frequency of 2.3 ± 0.9 s−1 at 320 mV overpotential, which are two and four times higher than those of mass-selected IrO2, respectively. Density functional theory calculations reveal that special iridium coordinations and the lowered aqueous decomposition free energy might be responsible for the enhanced performance.
  • 备注:Ya-Rong Zheng†, Jerome Vernieres†, Zhenbin Wang†, Ke Zhang†, Degenhart Hochfilzer, Kevin Krempl , Ting-Wei Liao, Francesco Presel  , Thomas Altantzis, Jarmo Fatermans, Soren Bertelsen Scott, Niklas Mørch Secher, Choongman Moon, Pei Liu, Sara Bals, Sandra Van Aert   , Ang Cao, Megha Anand, Jens K. Nørskov*, Jakob Kibsgaard, and Ib Chorkendorff*
  • 卷号:7
  • 页面范围:55-64
  • 是否译文:
  • 发表时间:2022-01-01
  • 发布期刊链接:https://www.nature.com/articles/s41560-021-00948-w