Unified surface modification by double heterojunction of MoS2 nanosheets and BiVO4 nanoparticles to enhance the photoelectrochemical water splitting of hematite photoanode

Dual CoxSy-Modified Tungsten Disulfide Double-Heterojunction Electrocatalyst for Efficient Hydrogen Evolution in All-pH Media

“…Particularly, the construction of double heterojunctions generally has outstanding properties, and the interaction of the two heterojunctions can further promote HER. 30,31 To test these hypotheses, WS 2 /Co 9 S 8 and WS 2 /Co 4 S 3 double heterojunctions grown on Co, N codoped porous carbon were prepared through a simple hydrothermal synthesis route, followed by the sulfurization process. The double heterojunction catalysts (WS 2 /Co 9 S 8 and WS 2 /Co 4 S 3 ) show better HER performance than their single heterojunction counterpart (WS 2 /Co 9 S 8 ) and bare Co 9 S 8 /Co 4 S 3 .…”

“…More importantly, charge transfer can be promoted and synergistic effect can be maximized by adjusting the composition and proportion of heterojunction interfaces. Particularly, the construction of double heterojunctions generally has outstanding properties, and the interaction of the two heterojunctions can further promote HER. , …”

Nanostructured NiCo2O4/BiVO4 Heterojunctions for Visible-Light Photocatalytic H2O-to-H2O2 Synchronized Organic Pollutant Oxidation

“…Many semiconductors including TiO 2 , ZnO, and SnO 2 have been investigated for photocatalytic H 2 O-to-H 2 O 2 oxidation. − Yet, these semiconductors still suffer from the rapid e – –h + pair recombination rate, resulting in relatively low photocatalytic efficiency . Bismuth vanadate (BiVO 4 ) with a band gap energy of 2.4 eV has been used for photocatalytic splitting of water mainly due to the advantages of visible-light-responsive activity, chemical stability, and low cost. − However, BiVO 4 suffered from a relatively high e – –h + pair recombination rate, which hindered its applications in photocatalytic H 2 O-to-H 2 O 2 oxidation. − …”

Efficient and Stable MoOX@Mo-BiVO4 Photoanodes for Photoelectrochemical Water Oxidation: Optimization and Understanding

“…In the past two decades, bismuth vanadate (BiVO 4 ) has been of interest to scientists for water splitting. − BiVO 4 has a favorable band gap (2.3–2.5 eV) for water splitting, which can absorb light in the visible region. , Its conduction band energy is slightly higher than that of the hydrogen evolution reaction (H + /H 2 ), but its valence band value is unified by the O 2p orbital, as in other metal oxides, below that of the oxygen evolution reaction (OER) (H 2 O/O 2 ). − Hence, the external bias applied voltage for the overall water splitting reaction for BiVO 4 is required to be approximately 0.2 V versus the reversible hydrogen electrode (RHE) . However, the solar-to-hydrogen (STH) conversion efficiency obtained using BiVO 4 is lower than the theoretical value because of the poor surface water oxidation kinetics and high rate of recombination. − Metal doping has been found to be an efficient approach for enhancing the surface reaction kinetics to assist hole extraction and injection against charge recombination. , …”