· 논문명 :  Alkaline-metal ions at defective sites of g-C3N4 for piezo-photocatalytic production of 

                H2O2 from pure water

· 저  자 : Pham Duc Minh Phan, Duc-Viet Nguyen, Tuyen Anh Luu, Tran My Ngan, Minh Chien Nguyen, 

                Ngoc Linh Nguyen, Tiep Van Nguyen, Luc Huy Hoang, Vu Quoc Trung,  Arvind Chandrasekar,

                Chung-Li Dong, Ekaterina Korneeva, Minh-Thuan Pham, Thuy Dieu Thi Ung,  Do Danh Bich,

               Woo Jong Yu, Seung Hyun Hur, Van-Han Dang, Nguyen Quang Hung*, Hoai-Thanh Vuong* 

· 게재지 : Applied Surface Science (2026, 736, 166762)

· 초록

The evolution of active sites under operating conditions is of importance for catalysis. Here, we reported the highest probability

of mobilizing both in-plane and interlayer structures of lithium (Li) when being doped to g-C3N4 lattices. Li-doped g-C3N4 

demonstrates a better production rate of H2O2 via piezo-photocatalysis at 5 mmol g-1h−1 compared to that of pristine g-C3N4

at 2.5 mmol g-1h−1 in oxygen-saturated water. Based on the kinetic model, the pristine g-C3N4 demonstrates a linear function 

between the concentration of H2O2 versus time, while the Li-doped sample follows a linear-exponential function, where the 

exponential part can be assigned to the changes in the mobility of Li in g-C3N4 modifying the active sites, leading to the changes

in charge separation and transportation under irradiations. Furthermore, the results from theoretical calculations combined with 

positron annihilation spectroscopies support the hypothesis. Therefore, enhanced activity in the production of H2O2 from alkaline

metal-doped g-C3N4 might be related to the mobility of dopants under reaction conditions. The finding offers new insights into the

role of dopants in accelerating the reaction rate on g-C3N4, benefiting not only on understanding the structure-catalytic relationship

but also on designing better catalysts for practical applications.