Selective Surface Reconstruction of a Defective Iridium-Based Catalyst for 
High-Efficiency Water Splitting

Pi, Y.; Xu, Y.; Li, L.; Sun, T.; Huang, B.; Bu, L.; Ma, Y.; Hu, Zhiwei; Pao, C.-W.; Huang, X.

doi:10.1002/adfm.202004375

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Selective Surface Reconstruction of a Defective Iridium-Based Catalyst for High-Efficiency Water Splitting

MPS-Authors

/persons/resource/persons126666

Hu, Zhiwei
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Pi, Y., Xu, Y., Li, L., Sun, T., Huang, B., Bu, L., et al. (2020). Selective Surface Reconstruction of a Defective Iridium-Based Catalyst for High-Efficiency Water Splitting. Advanced Functional Materials, 30(43): 2004375, pp. 1-10. doi:10.1002/adfm.202004375.

Cite as: https://hdl.handle.net/21.11116/0000-0007-0E6F-F

Abstract

Development of robust catalysts for electrochemical water splitting is a critical topic for the energy conversion field. Herein, a precise electrochemical reconstruction of IrTe2 hollow nanoshuttles (HNSs) is performed for oxygen and hydrogen evolution reactions (OER and HER), the two half reactions of water splitting. It is determined that the reconstruction of IrTe2 HNSs can be regulated by adjusting the potential during electrochemical dealloying, in which mild and high potentials lead to the formation of IrTe2 HNSs with metal Ir shell (D-IrTe2 HNSs) and IrOx surface (DO-IrTe2 HNSs), respectively. Detailed analyses reveal that such electrochemical reconstruction has produced abundant defects in D-IrTe2 and DO-IrTe2 HNSs. As a result of this, D-IrTe2 HNSs present a very low HER overpotential of 54 mV at a current density of 10 mA cm−2 in 1.0 m KOH. Moreover, the turnover frequency of DO-IrTe2 HNSs is 0.36 O2 s−1 at an OER overpotential of 250 mV in 0.5 m H2SO4, outperforming the most of reported Ir-based catalysts. Furthermore, the D-IrTe2||DO-IrTe2 couple exhibits promising activity for the overall water splitting in both 1.0 m KOH and 0.5 m H2SO4. This study promotes the fundamental research for the design of efficient catalysts via surface engineering. © 2020 Wiley-VCH GmbH