Stacking‐Layer‐Number Dependence of Water Adsorption in 3D Ordered Close‐Packed g‐C3N4 Nanosphere Arrays for Photocatalytic Hydrogen Evolution

Finding the right number: 3D ordered close‐packed g‐C₃N₄ nanosphere arrays are constructed by a two‐step nanocasting method. Through a precise control of the average nanosphere stacking layer number in the arrays, a stacking‐layer‐number dependence of water adsorption is revealed, which subsequently leads to a remarkably improved photocatalytic hydrogen evolution on the optimized sample.

Abstract

Water adsorption capacity is a key factor to influence the photocatalytic H₂ evolution activity of polymeric g‐C₃N₄ . Herein, we report the synthesis of 3D ordered close‐packed g‐C₃N₄ nanosphere arrays (CNAs) that significantly enhance the water adsorption capacity. Through precisely controlling the average stacking‐layer number (ASLN) of the nanospheres in CNAs, we reveal an interesting stacking‐layer‐number dependence of water adsorption in the newly designed CNAs for accelerating the H₂ evolution reaction, which can be attributed to the differences in adsorption surface areas and adsorption sites endowed by the point‐defect cavities in sample CNAs.

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