Heterojunction design in a two-dimensional(2D)fashion has been deemed beneficial for improving the photocatalytic activity of g-C_(3)N_(4)because of the promoted interfacial charge transfer,yet still facing challenges...Heterojunction design in a two-dimensional(2D)fashion has been deemed beneficial for improving the photocatalytic activity of g-C_(3)N_(4)because of the promoted interfacial charge transfer,yet still facing challenges.Herein,we construct a novel 2D/2D Cu_(3)P nanosheet/P-doped g-C_(3)N_(4)(PCN)nanosheet heterojunction photocatalyst(PCN/Cu_(3)P)through a simple in-situ phosphorization treatment of 2D/2D CuS/g-C_(3)N_(4)composite for photocatalytic H2 evolution.We demonstrate that the 2D lamellar structure of both CuS and g-C_(3)N_(4)could be well reserved in the phosphorization process,while CuS and g-C_(3)N_(4)in-situ transformed into Cu_(3)P and PCN,respectively,leading to the formation of PCN/Cu_(3)P tight 2D/2D heterojunction.Owing to the large contact area provided by intimate face-to-face 2D/2D structure,the PCN/Cu_(3)P photocatalyst exhibits significantly enhanced charge separation efficiency,thus achieving a boosted visible-light-driven photocatalytic behavior.The highest rate for H2 evolution reaches 5.12 umol·h^(-1),nearly 24 times and 368 times higher than that of pristine PCN and g-C_(3)N_(4),respectively.This work represents an excellent example in elaborately con-structing g-C_(3)N_(4)-based 2D/2D heterostructure and could be extended to other photocatalyst/co-catalyst system.展开更多
基金We acknowledge the support from the National Natural Science Foundation of China(Nos.51876173 and 52142604)the Natural Science Foundation of Jiangsu Province(No.BK20190054)+2 种基金the Suzhou Science and Technology Program(SYG202101)Fok Ying-Tung Education Foundation(No.171048)the China Fundamental Research Funds for the Central Universities.
文摘Heterojunction design in a two-dimensional(2D)fashion has been deemed beneficial for improving the photocatalytic activity of g-C_(3)N_(4)because of the promoted interfacial charge transfer,yet still facing challenges.Herein,we construct a novel 2D/2D Cu_(3)P nanosheet/P-doped g-C_(3)N_(4)(PCN)nanosheet heterojunction photocatalyst(PCN/Cu_(3)P)through a simple in-situ phosphorization treatment of 2D/2D CuS/g-C_(3)N_(4)composite for photocatalytic H2 evolution.We demonstrate that the 2D lamellar structure of both CuS and g-C_(3)N_(4)could be well reserved in the phosphorization process,while CuS and g-C_(3)N_(4)in-situ transformed into Cu_(3)P and PCN,respectively,leading to the formation of PCN/Cu_(3)P tight 2D/2D heterojunction.Owing to the large contact area provided by intimate face-to-face 2D/2D structure,the PCN/Cu_(3)P photocatalyst exhibits significantly enhanced charge separation efficiency,thus achieving a boosted visible-light-driven photocatalytic behavior.The highest rate for H2 evolution reaches 5.12 umol·h^(-1),nearly 24 times and 368 times higher than that of pristine PCN and g-C_(3)N_(4),respectively.This work represents an excellent example in elaborately con-structing g-C_(3)N_(4)-based 2D/2D heterostructure and could be extended to other photocatalyst/co-catalyst system.
