Nguyen Thanh Tam, Edalati Kaveh
WPI, International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan; Mitsui Chemicals, Inc -.Carbon Neutral Research Center (MCI-CNRC), Kyushu University, Fukuoka 819-0395, Japan.
WPI, International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan; Mitsui Chemicals, Inc -.Carbon Neutral Research Center (MCI-CNRC), Kyushu University, Fukuoka 819-0395, Japan.
J Colloid Interface Sci. 2025 Sep 6;702(Pt 2):138951. doi: 10.1016/j.jcis.2025.138951.
This study explores highly active nitride-based g-CN/CuO photocatalysts for CO photoconversion by synthesizing them through high-pressure torsion (HPT) straining. Data indicate that increasing the applied strain under high pressure promotes vacancy formation and improves the electronic interaction at the g-CN/CuO interphases, enabling superior charge separation and extended light absorption. The generation of dual vacancies of oxygen and nitrogen is verified by electron paramagnetic resonance and Fourier transform infrared spectroscopic methods, and the generation of a type-II heterojunction is confirmed by band structure analysis. Photocatalytic experiments reveal a threefold increase in the formation of CO and CH using g-CN/CuO in comparison with the pure g-CN photocatalyst. This investigation highlights the potential of synergic vacancy and interface engineering, realized by HPT for the first time in nitride-based composites, for sustainable CO photoreduction applications.
本研究通过高压扭转（HPT）应变合成了用于CO光转化的高活性氮化物基g-CN/CuO光催化剂。数据表明，在高压下增加施加的应变会促进空位形成，并改善g-CN/CuO界面处的电子相互作用，从而实现卓越的电荷分离并扩展光吸收。通过电子顺磁共振和傅里叶变换红外光谱方法验证了氧和氮双空位的产生，并通过能带结构分析证实了II型异质结的形成。光催化实验表明，与纯g-CN光催化剂相比，使用g-CN/CuO时CO和CH的生成量增加了两倍。这项研究突出了协同空位和界面工程的潜力，这是首次在氮化物基复合材料中通过高压扭转实现，可用于可持续的CO光还原应用。
