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Misfit‐Layered Bi 1.85 Sr 2 Co 1.85 O 7.7− δ for the Hydrogen Evolution Reaction: Beyond van der Waals Heterostructures
Author(s) -
Chua Chun Kiang,
Sofer Zdeněk,
Jankovský Ondřej,
Pumera Martin
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201402836
Subject(s) - overpotential , tafel equation , chalcogenide , materials science , water splitting , thermoelectric effect , electrochemistry , van der waals force , hydrogen , nanotechnology , chemistry , electrode , catalysis , optoelectronics , thermodynamics , molecule , biochemistry , physics , organic chemistry , photocatalysis
Recent research on stable 2D nanomaterials has led to the discovery of new materials for energy‐conversion and energy‐storage applications. A class of layered heterostructures known as misfit‐layered chalcogenides consists of well‐defined atomic layers and has previously been applied as thermoelectric materials for use as high‐temperature thermoelectric batteries. The performance of such misfit‐layered chalcogenides in electrochemical applications, specifically the hydrogen evolution reaction, is currently unexplored. Herein, a misfit‐layered chalcogenide consisting of CoO 2 layers interleaved with an SrO–BiO–BiO–SrO rock‐salt block and having the formula Bi 1.85 Sr 2 Co 1.85 O 7.7− δ is synthesized and examined for its structural and electrochemical properties. The hydrogen‐evolution performance of misfit‐layered Bi 1.85 Sr 2 Co 1.85 O 7.7− δ , which has an overpotential of 589 mV and a Tafel slope of 51 mV per decade, demonstrates the promising potential of misfit‐layered chalcogenides as electrocatalysts instead of classical carbon.