Self-healing mechanisms toward stable photoelectrochemical water splitting
Achieving stability poses a significant challenge in the practical implementation of photoelectro-chemical(PEC)water splitting.The main factors affecting the long-term stability of PEC devices are chemical-and photo-corrosion of the semiconductor light absorbers,along with damage to the surface protection layer and the loss or reconstruction of the active centers of the co-catalysts.In-troducing the concept of self-healing provides new strategies to enhance the stability of the semi-conductor light absorbers,protection layer and co-catalysts in PEC water-splitting studies.Contin-uous exploration of these dynamic repair strategies is expected to promote the long-term stability of the PEC devices.This review outlines the deactivation mechanisms of different semiconductor light absorbers,protection layers,and co-catalysts under operational conditions.We further high-light corresponding regeneration and repair strategies,while addressing the challenges and pro-spects associated with constructing self-healing stable PEC water-splitting systems.
Self-healingPhotoelectrochemical water splittingStabilitySemiconductor light absorbersProtection layerCo-catalyst
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