Electric Field–Controlled Multistep Proton Evolution in HxSrCoO2.5 with Formation of H–H Dimer

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Hao-Bo Li
  • Feng Lou
  • Yujia Wang
  • Yang Zhang
  • Qinghua Zhang
  • Dong Wu
  • Zhuolu Li
  • Meng Wang
  • Tongtong Huang
  • Yingjie Lyu
  • Jingwen Guo
  • Tianzhe Chen
  • Yang Wu
  • Elke Arenholz
  • Nianpeng Lu
  • Nanlin Wang
  • Qing He
  • Lin Gu
  • Jing Zhu
  • Ce-Wen Nan
  • Hongjun Xiang
  • Pu Yu

Detail(s)

Original languageEnglish
Article number1901432
Journal / PublicationAdvanced Science
Volume6
Issue number20
Online published15 Aug 2019
Publication statusPublished - 16 Oct 2019
Externally publishedYes

Abstract

Ionic evolution–induced phase transformation can lead to wide ranges of novel material functionalities with promising applications. Here, using the gating voltage during ionic liquid gating as a tuning knob, the brownmillerite SrCoO2.5 is transformed into a series of protonated HxSrCoO2.5 phases with distinct hydrogen contents. The unexpected electron to charge-neutral doping crossover along with the increase of proton concentration from x = 1 to 2 suggests the formation of exotic charge neutral H–H dimers for higher proton concentration, which is directly visualized at the vacant tetrahedron by scanning transmission electron microscopy and then further supported by first principles calculations. Although the H–H dimers cause no change of the valency of Co2+ ions, they result in clear enhancement of electronic bandgap and suppression of magnetization through lattice expansion. These results not only reveal a hydrogen chemical state beyond anion and cation within the complex oxides, but also suggest an effective pathway to design functional materials through tunable ionic evolution.

Research Area(s)

  • brownmillerite, charge-neutral H–H, ionic liquid gating, protonation

Citation Format(s)

Electric Field–Controlled Multistep Proton Evolution in HxSrCoO2.5 with Formation of H–H Dimer. / Li, Hao-Bo; Lou, Feng; Wang, Yujia; Zhang, Yang; Zhang, Qinghua; Wu, Dong; Li, Zhuolu; Wang, Meng; Huang, Tongtong; Lyu, Yingjie; Guo, Jingwen; Chen, Tianzhe; Wu, Yang; Arenholz, Elke; Lu, Nianpeng; Wang, Nanlin; He, Qing; Gu, Lin; Zhu, Jing; Nan, Ce-Wen; Zhong, Xiaoyan; Xiang, Hongjun; Yu, Pu.

In: Advanced Science, Vol. 6, No. 20, 1901432, 16.10.2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal