Li JunYan, Xing Fangyuan, Liu Shiqiao, Xiong Zhiyong, Wang Chengzhi, Li Ning, Jin Haibo, Su Yuefeng, Feng Caihong, Li Jingbo
Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; Beijing Institute of Technology (Zhuhai), No. 6 Jinfeng Road, Tangjiawan, Zhuhai 519085, China.
Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
J Colloid Interface Sci. 2025 Dec 15;700(Pt 3):138565. doi: 10.1016/j.jcis.2025.138565. Epub 2025 Jul 28.
Graphitic carbon nitride (g-CN) has garnered significant interest in photocatalytic technology for addressing energy crisis and environmental pollution, owing to its remarkable structural stability and photocatalytic properties. Nevertheless, the photocatalytic performance of g-CN is limited by its low efficiency in carrier separation. This study synthesizes Na and K co-doped g-CN hollow spheres (NaK-CN) with an ultra-thin shell through high-temperature calcination, substantially improving its photocatalytic activity in hydrogen production from water splitting. The photocatalytic hydrogen production efficiency of NaK-CN reaches 4502 μmol h g, which is five times that of the original g-CN hollow sphere. This significant improvement is attributed to the formation of intralayer NaN and interlayer KN bonds, which enhances carrier separation and transfer within and between the layers, as evidenced by DFT calculations and ultrafast transient absorption (TA) spectroscopy. The results demonstrate that the creation of a 3D carrier transport network by Na and K doping at different crystallographic sites significantly improves the photocatalytic activity of CN and introduces a novel strategy for developing highly efficient photocatalysts.
石墨相氮化碳（g-CN）因其卓越的结构稳定性和光催化性能，在解决能源危机和环境污染的光催化技术领域引起了广泛关注。然而，g-CN的光催化性能受到其载流子分离效率低下的限制。本研究通过高温煅烧合成了具有超薄壳层的Na和K共掺杂g-CN空心球（NaK-CN），大幅提高了其光催化水分解产氢活性。NaK-CN的光催化产氢效率达到4502 μmol h g，是原始g-CN空心球的五倍。这一显著提升归因于层内NaN键和层间KN键的形成，增强了层内和层间的载流子分离与转移，密度泛函理论（DFT）计算和超快瞬态吸收（TA）光谱证实了这一点。结果表明，通过在不同晶体学位点进行Na和K掺杂构建三维载流子传输网络，显著提高了CN的光催化活性，并为开发高效光催化剂引入了一种新策略。
