In this work, trithiocyanuric acid and graphene oxide quantum dots (GOQDs) served as sulfur (S) and carbon (C) sources to prepared S-, C-codoped carbon nitride (SCCN). The morphology of SCCN changes from lamellar to airbag-like nanostructure with GOQD addition. The photocatalytic hydrogen evolution performance of the optimized SCCN photocatalyst is shown to be 5.6 times higher than that of the CNS photocatalyst. The mechanism of the improved performance is further investigated. It is found that the concentration of hydroxide radical increases during the photocatalytic process, on the basis of the valence band potential of the SCCN photocatalyst moving positively and the surface oxidation energy barrier decreasing. Furthermore, the charge transfer capacity of the SCCN photocatalyst is improved also, so the recombination rate of the photogenerated free charges decreases.

中文翻译：

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硫和碳掺杂的氮化碳改善光催化制氢性能

在这项工作中，三硫氰尿酸和氧化石墨烯量子点（GOQD）用作硫（S）和碳（C）的来源，以制备S，C共掺杂的氮化碳（SCCN）。添加GOQD后，SCCN的形态从层状变为气囊状纳米结构。经优化的SCCN光催化剂的光催化氢释放性能显示为CNS光催化剂的5.6倍。进一步研究了提高性能的机制。发现在SCCN光催化剂的价带电势正向移动且表面氧化能垒降低的基础上，氢氧根自由基的浓度在光催化过程中增加。此外，SCCN光催化剂的电荷转移能力也得到提高，