Molybdenum diselenide (MoSe ) is widely considered as one of the most promising catalysts for the hydrogen evolution reaction (HER). However, the absence of active sites and poor conductivity of MoSe severely restrict its HER performance. By introducing a layer of MoO on Mo foil, MoSe /MoO hybrid nanosheets with an abundant edge and high electrical conductivity can be synthesized on the surface of Mo foil. Metallic MoO can improve the charge transport efficiency of MoSe /MoO , thereby enhancing the overall HER performance. MoSe /MoO exhibits fast hydrogen evolution kinetics with a small overpotential of 142 mV versus RHE at a current density of 10 mA cm and Tafel slope of 48.9 mV dec .
The
ultrathin insulator layer in the silicon metal–insulator–semiconductor
(MIS) photoanode plays important roles in determining the performance
of water oxidation. We report that an insulator oxide electroforming
phenomenon that occurred during long-term oxygen evolution reaction
testing under constant external voltage is the primary reason for
the degradation of the silicon MIS photoanode. Compared with TiO2, ZrO2 exhibits high electro-reduce resistance,
which minimizes the cation transport in the dielectric film, thereby
significantly enhancing the stability of silicon MIS photoanodes.
Silicon passivated with an ultrathin ZrO2 film deposited
by atomic layer deposition (ALD) exhibits high stability (>100
h) under alkaline conditions (PH = 14). Combined with a NiFe catalyst,
the NiFe/ZrO2/n-Si photoanode exhibits
improved OER activity with a low onset potential (∼0.96 V versus
RHE), a high photocurrent density (26.6 mA·cm–2) at 1.23 V versus RHE, and a record high saturated current density
of 36.4 mA·cm–2.
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