TiO₂/g-CN based photocatalyst has been widely studied for its easy synthesis and outstanding charge separation efficiency. However, the difficulty in obtaining a high photocurrent value limits its application in photoelectrocatalysis water splitting. In this article, bimetallic NiMoO₄ nanosheets co-catalyst was decorated onto TiO₂/g-CN heterojunction to form TiO₂/g-CN/NiMoO₄ 3D nanostructure. We obtained a photocurrent density as high as 1.8 mA/cm² under 1 sun illumination at 1.23 V versus RHE, which is 2 times higher than that of pristine TiO₂ nanorods arrays (NRs). The improved performance mainly comes from two aspects. One is g-CN expands the response range to visible light, and forms a heterojunction with TiO₂, which improves the efficiency of charge separation at the same time. The other is that the addition of bimetallic NiMoO₄ nanosheets oxygen evolution co-catalyst increases the surface active sites, and reduces the surface reaction barrier to promote oxidation reaction.

TiO ₂ / g-CN基光催化剂因其易于合成和出色的电荷分离效率而被广泛研究。然而，难以获得高光电流值限制了其在光催化水分解中的应用。在本文中，将双金属NiMoO ₄纳米片助催化剂装饰在TiO ₂ / g-CN异质结上，形成TiO ₂ / g-CN / NiMoO ₄ 3D纳米结构。与RHE相比，在1.23 V的1个太阳光照下，我们获得的光电流密度高达1.8 mA / cm ²，是原始TiO _2的2倍纳米棒阵列（NRs）。改进的性能主要来自两个方面。一种是g-CN扩大了对可见光的响应范围，并与TiO ₂形成异质结，从而同时提高了电荷分离的效率。另一个是添加双金属NiMoO ₄纳米片时，放氧助催化剂增加了表面活性位，并降低了表面反应势垒，从而促进了氧化反应。