A single atom photocatalyst co-doped with potassium and gallium for enhancing photocatalytic hydrogen peroxide synthesis  

作　　者：Wenan Cai Yuichiro Tanaka Xing Zhu Teruhisa Ohno 

机构地区：[1]Department of Applied Chemistry,Faculty of Engineering,Kyushu Institute of Technology,Kitakyushu 804-8550,Japan [2]College of Bioresources Chemical and Materials Engineering,Shaanxi University of Science&Technology,Xi’an 710021,China

出　　处：《Nano Research》2024年第8期7027-7038,共12页纳米研究（英文版）

基　　金：The support of Mitsubishi Chemical Corporation and the Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research B(No.20H02847);the Support for Pioneering Research Initiated by the Next Generation program for Japan Science and Technology Agency(No.JPMJSP2154);the National Natural Science Foundation of China(No.52103008)are greatly acknowledged.

摘　　要：Polymer carbon nitride(PCN)is widely used in photocatalysis.However,pristine PCN has disadvantages such as insufficient visible light absorption and low photogenerated carrier separation efficiency that greatly limited the photocatalytic efficiency.As a non-toxic metal,gallium has the potential to solve the defects of PCN.Gallium ions coordinated with nitrogen in carbon nitride to form Ga-N active sites and improved the photocatalytic activity.The doped potassium ions form a transmission channel for charge redistribution and transfer between adjacent layers,which is beneficial for better separation of photoexcited carriers.In this study,a series of PCN co-doped with gallium and potassium(Ga-K-PCN)were prepared.The experimental results indicated photocatalytic generation of hydrogen peroxide proceeds through the 2e−oxygen reduction reaction pathway.Notably,Nyquist plots and photocurrent results further proved that the presence of Ga-N sites and potassium ion doping could significantly improve the separation/transfer of intra-planar and interlayer charge carriers and thus enhance photocatalytic efficiency.The Ga10-K3-PCN photocatalysts promoted yield of H_(2)O_(2),with reactivity at 28.2μmol/(g·h)and solar-to-chemical conversion efficiency at 0.64%,surpassed that of a typical photo-catalyst based on PCN(0.18%).

关 键 词：photocatalysis GALLIUM oxygen reduction reaction H_(2)O_(2) production 

分 类 号：O61[理学—无机化学]