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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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Polymorphic cobalt diselenide as extremely stable electrocatalyst in acidic media via a phase-mixing strategy
  • 发表刊物:Nat. Commun.
  • 摘要:Many platinum group metal-free inorganic catalysts have demonstrated high intrinsic activity for diverse important electrode reactions, but their practical use often suffers from undesirable structural degradation and hence poor stability, especially in acidic media. We report here an alkali-heating synthesis to achieve phase-mixed cobalt diselenide material with nearly homogeneous distribution of cubic and orthorhombic phases. Using water electroreduction as a model reaction, we observe that the phase-mixed cobalt diselenide reaches the current density of 10 milliamperes per square centimeter at overpotential of mere 124 millivolts in acidic electrolyte. The catalyst shows no sign of deactivation after more than 400 h of continuous operation and the polarization curve is well retained after 50,000 potential cycles. Experimental and computational investigations uncover a boosted covalency between Co and Se atoms resulting from the phase mixture, which substantially enhances the lattice robustness and thereby the material stability. The findings provide promising design strategy for long-lived catalysts in acid through crystal phase engineering.
  • 备注:Xiao-Long Zhang†, Shao-Jin Hu†, Ya-Rong Zheng†, Rui Wu, Fei-Yue Gao, Peng-Peng Yang, Zhuang-Zhuang Niu, Chao Gu, Xingxing Yu, Xu-Sheng Zheng, Cheng Ma, Xiao Zheng, Jun-Fa Zhu, Min-Rui Gao,* and Shu-Hong Yu*
  • 卷号:10
  • 页面范围:5338
  • 是否译文:
  • 发表时间:2019-11-25
  • 发布期刊链接:https://www.nature.com/articles/s41467-019-12992-y