近年来，二维(2D)g-C3N4基材料因其较短的电荷传输距离和充分暴露的表面活性位点，受到科研工作者的广泛关注。然而，g-C3N4较差的电荷分离和光吸收能力限制了进一步实际应用。通过引入具有高载流子迁移率和可见光响应的磷烯(FBP)，构建FBP/g-C3N4异质结同时增强光催化剂的光吸收和电荷分离能力；同时，具有良好催化活性的FBP也可以作为g-C3N4的助催化剂，进一步降低电荷在催化剂/电解液界面处的反应势垒，从而有效抑制电荷复合，并提高光催化制氢效率。研究结果表明：相较于纯g-C3N4，FBP/g-C3N4异质结不仅可以有效抑制电荷复合、促进光生电荷分离，而且可以极大地拓宽光谱响应范围。最终，构建的FBP/g-C3N4异质结光催化剂获得了1.08 mmol?g-1?h-1的光催化制氢速率，相较于纯g-C3N4提高了1.2倍。

Recently, two-dimension g-C3N4 based materials have received tremendous attention, ascribing to its short charge diffusion distance and sufficiently exposed surface active sites. However, the poor charge separation and light harvesting still remains a great challenge for their practical applications. Herein, phosphorene/g-C3N4 heterojunction was constructed by simple introducing phosphorene which own visible light response and high mobility, to promote charge separation and light harvesting. Meanwhile, phosphorene can be regarded as effective co-catalyst for g-C3N4 to reduce the barrier of charge transfer between photocatalyst and electrolyte interface, and thus suppress charge recombination and improve photocatalytic hydrogen evolution rate. Compared to pure g-C3N4, the phosphorene/g-C3N4 heterojunction presents not only better charge separation and lower charge recombination, but also wider light response. As a result, the photocatalytic hydrogen evolution rate as high as 1.08 mmol?g-1?h-1 is achieved for phosphorene/g-C3N4 heterojunction, which is 1.2 times higher than the pure g-C3N4.