The efficiency of photocatalytic water splitting, and CO conversion depend on the separation and transfer of charge carriers. Graphitic carbon components with decent conductivity can enhance the transport of the photoinduced charges in semiconductor heterostructures. As a typical visible-light-responsive photocatalyst, the application of graphitic carbon nitride (g-CN) is often limited by the relatively high recombination rate of photogenerated charge carriers. g-CN has been a hot base material for constructing metals and semiconductors modified hetero- and homo-junctions for the application of solar-driven fuel production. Graphitic carbon components are the keys in enhancing the transport efficiency of photogenerated charge carriers in g-CN based heterostructures. In this review, important aspects of the roles of graphitic carbon components in g-CN based photocatalysts are discussed to provide paradigms for the advancement of these materials in photocatalytic water splitting and CO reduction. Moreover, graphitic carbon can serve as a coating material, or be in layer or nanotube forms, to be incorporated into heterostructure materials to affect the mobility of the charge carriers in Schottky junctions as well as in Z-scheme and S-scheme heterostructures. Important feature changes in g-CN based photocatalysts after graphitic carbon incorporation as well as the progress and achievements in these composite photocatalyst materials in water splitting and CO reduction are summarized.

中文翻译：

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石墨碳在 g-C3N4 纳米结构中对高效光催化反应动力学的作用：综述

光催化水分解和CO转化的效率取决于载流子的分离和转移。具有良好导电性的石墨碳成分可以增强半导体异质结构中光生电荷的传输。作为典型的可见光响应光催化剂，石墨氮化碳（g-CN）的应用往往受到光生载流子相对较高复合率的限制。g-CN一直是构建金属和半导体改性异质结和同质结的热门基础材料，用于太阳能驱动燃料生产的应用。石墨碳成分是提高 g-CN 异质结构中光生载流子传输效率的关键。在这篇综述中，讨论了石墨碳组分在 g-CN 基光催化剂中的作用的重要方面，为这些材料在光催化水分解和 CO 还原方面的进步提供范例。此外，石墨碳可以用作涂层材料，或者以层或纳米管的形式掺入异质结构材料中，以影响肖特基结以及Z型和S型异质结构中电荷载流子的迁移率。总结了石墨碳掺入后g-CN基光催化剂的重要特征变化以及这些复合光催化剂材料在水分解和CO还原方面的进展和成就。