Bifunctional 2D Superlattice Electrocatalysts of Layered Double Hydroxide-Transition Metal Dichalcogenide Active for Overall Water Splitting

Md Shahinul Islam, Minho Kim, Xiaoyan Jin, Seung Mi Oh, Nam Suk Lee, Hyungjun Kim, Seong Ju Hwang

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Bifunctional 2D superlattice electrocatalysts of alternating layered double hydroxide (LDH)-transition metal dichalcogenide (TMD) heterolayers were synthesized by interstratification of the exfoliated nanosheets. Density functional theory calculations predict an increased interfacial charge transfer between interstratified LDH and TMD nanosheets, which would lead to enhanced electrocatalytic activity. The electrostatically driven self-assembly of oppositely charged 2D building blocks, i.e., exfoliated Ni-Al-LDH/Ni-Fe-LDH and MoS2 nanosheets, yields mesoporous heterolayered Ni-Al-LDH-MoS2/Ni-Fe-LDH-MoS2 superlattices. The synthesized superlattices show improved electrocatalytic activity with enhanced durability for oxygen and hydrogen evolution reactions and water splitting. The interstratification improves the chemical stability of LDH in acidic media, thus expanding its possible applications. The high electrocatalytic activity of the superlattices may be attributed to an enhanced affinity for OH-/H+, improved electrical conduction and charge transfer, and the increase of active sites. This study indicates that the formation of superlattices via self-assembly of 2D nanosheets provides useful methodology to explore high-performance electrocatalysts with improved stability.

Original languageEnglish
Pages (from-to)952-960
Number of pages9
JournalACS Energy Letters
Volume3
Issue number4
DOIs
Publication statusPublished - 2018 Apr 13

All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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