Solar-Powered Gram-Scale Ammonia Production from Nitrate.

The photoelectrochemical (PEC) method has the potential to be an attractive route for converting and storing solar energy as chemical bonds. In this study, a maximum NH production yield of 1.01 g L with a solar-to-ammonia conversion efficiency of 8.

Nanostructured Gallium Nitride Membrane at Wafer Scale for Photo(Electro)catalytic Polluted Water Remediation.

Photo(electro)catalysis methods have drawn significant attention for efficient, energy-saving, and environmental-friendly organic contaminant degradation in wastewater. However, conventional oxide-based powder photocatalysts are limited to UV-light absorption and are unfavorable in the subsequent postseparation process. In this paper, a large-area crystalline-semiconductor nitride membrane with a distinct nanoporous surface is fabricated, which can be scaled up to a full wafer and easily retrieved after photodegradation.

Highly Efficient and Stable Photoelectrochemical Hydrogen Evolution with 2D-NbS/Si Nanowire Heterojunction.

In recent days, 2-dimensional (2D) niobium disulfide (NbS) with near-zero Gibbs free energy and superlative acid electrolyte stability has provoked a great deal of interest toward hydrogen evolution reaction (HER) electrocatalyst due to its active basal and edge sulfur sites. Herein, we developed a single step method for the direct deposition of 2D-NbS on high-aspect-ratio topographies of silicon nanowires (NWs) by chemical vapor deposition for the applications in HER electrocatalyst. The resultant 2D-NbS electrocatalyst demonstrates the HER overpotential of ∼74 mV vs RHE (reversible hydrogen electrode) @ 1 mA/cm under acidic conditions and stable for more than 20 h.

Vertically aligned MoS nanosheets on graphene for highly stable electrocatalytic hydrogen evolution reactions.

Conducting an efficient hydrogen evolution reaction (HER) using two-dimensional molybdenum disulphide as electrocatalysts remains a challenging task due to the insufficient active edge sites. In this regard, herein, molybdenum disulphide nanosheets with rich active sulphur sites were vertically grown on the graphene surface via a chemical vapour deposition process. The direct integration of vertically aligned MoS2 nanosheets on graphene forms a van der Waals (vdW) heterojunction, which facilitates a barrier-free charge transport towards the electrolyte as a result of unique and well-matched energy band alignment at the interface.