5.1% efficiency of Si photoanodes for photoelectrochemical water splitting catalyzed by porous NiFe (oxy)hydroxide converted from NiFe oxysulfide.

A porous NiFe (oxy)hydroxide catalyst fabricated on n+pp+-Si/Ni/NiOx, which is converted from an electrodeposited NiFe oxysulfide, allows a silicon photoanode for water splitting to hit a record 5.1% efficiency with good stability of up to 135 h under 40 mA cm-2 in 1.0 M NaOH.

A porous Ni-O/Ni/Si photoanode for stable and efficient photoelectrochemical water splitting.

Excellent photoelectrochemical activity was demonstrated for an easily prepared porous Ni-O/Ni/Si photoanode with an onset potential of 0.93 VRHE, a photocurrent of 39.7 mA cm-2 at 1.23 VRHE, an energy conversion efficiency of 3.2% and a stability above 100 h.

11.5% efficiency of TiO2 protected and Pt catalyzed n+np+-Si photocathodes for photoelectrochemical water splitting: manipulating the Pt distribution and Pt/Si contact.

A combination of hydrogen passivation, electroless deposition of a Pt catalyst and coating a TiO2 protective layer leads to an unprecedented 11.5% energy conversion efficiency and one-week stability of an n+np+-Si photocathode for solar water splitting.