Unlocking the Potential of Mechanochemical Coupling : Boosting the Oxygen Evolution Reaction by Mating Proton Acceptors with Electron Donors

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

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Author(s)

  • Antonino Curcio
  • Zheng Wang
  • Zhiqi Zhang
  • Alessio Belotti
  • Simona Pepe
  • Mohammed B. Effat
  • Zongping Shao
  • Jongwoo Lim
  • Francesco Ciucci

Detail(s)

Original languageEnglish
Article number2008077
Journal / PublicationAdvanced Functional Materials
Volume31
Issue number4
Online published16 Oct 2020
Publication statusPublished - 22 Jan 2021
Externally publishedYes

Abstract

The oxygen evolution reaction (OER) is the bottleneck of many sustainable energy conversion systems, including water splitting technologies. The kinetics of the OER is generally sluggish unless precious metal-based catalysts are used. Perovskite oxides have shown promise as alternatives to these expensive materials. However, for several perovskites, including SrCoO3δ, the rate-limiting step is proton-transfer. In this study, it is shown that such a kinetic limitation can be overcome by coupling those perovskites with MoS2 mechanochemically. By studying composites of SrMO3−δ (M = Co, Fe, Ti) and MoS2, the role that the formed heterointerfaces play in enhancing the activity is investigated. Mechanochemically mating SrCoO3−δ and MoS2 increases the mass activity toward OER by a factor of ten and led to a Tafel slope of only 37 mV dec−1. In contrast, combining MoS2 with SrFeO3−δ or SrTiO3−δ, two materials whose OER is not limited by proton-transfer, does not result in an improvement of the performance. The experimental measurements and first-principle calculations reveal that the MoS2 at the MoS2@SrCoO3−δ heterointerfaces is both an electron and a proton acceptor, thereby facilitating deprotonation of the perovskite and resulting in faster OER kinetics.

Research Area(s)

  • electrocatalysis, hydrogen evolution reaction, oxygen evolution reaction, perovskites, water splitting

Citation Format(s)

Unlocking the Potential of Mechanochemical Coupling : Boosting the Oxygen Evolution Reaction by Mating Proton Acceptors with Electron Donors. / Curcio, Antonino; Wang, Jian; Wang, Zheng et al.

In: Advanced Functional Materials, Vol. 31, No. 4, 2008077, 22.01.2021.

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