Transition metal-based layered double hydroxides and their derivatives for efficient oxygen evolution reaction

Oxygen evolution reaction (OER), as an important process in water splitting has attracted more and more attention in clean energy production and efficient energy storage. Layered double hydroxides (LDHs) are typical two-dimensional materials with unique layered structures, high specific surface area, exchangeability of metal ions, diversity of intercalated anions and unique electron distribution, which can serve as catalysts for OER. However, their poor conductivity limits their application in catalysis. In this review, three classes of LDHs materials, including pure LDHs, LDHs derivatives and LDHs composites are systematically reviewed and their development and applications in OER are comprehensively presented. Moreover, further research methods and directions on LDHs as OER catalysts were also prospected. In particular, this review highlights the potential synthesis-structure-property correlations of these layered materials. These will provide guidance for designing efficient OER electrocatalysts and evaluating their performance.