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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

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


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

Lin Gu

Jing Zhu

Ce‐Wen Nan

Xiaoyan Zhong

Hongjun Xiang

Pu Yu


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.


Li, H., Lou, F., Wang, Y., Zhang, Y., Zhang, Q., Wu, D., …Yu, P. (2019). Electric Field–Controlled Multistep Proton Evolution in HxSrCoO2.5 with Formation of H–H Dimer. Advanced Science, 6(20), Article 1901432.

Journal Article Type Article
Online Publication Date Aug 15, 2019
Publication Date Oct 16, 2019
Deposit Date Aug 29, 2019
Publicly Available Date Aug 29, 2019
Journal Advanced Science
Electronic ISSN 2198-3844
Publisher Wiley Open Access
Peer Reviewed Peer Reviewed
Volume 6
Issue 20
Article Number 1901432


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Copyright Statement
Advance online version © 2019 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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