Photocatalytic water splitting converts sunlight directly to storable H₂, but commonly involves the use of a hole sacrificial agent and a noble metal cocatalyst, leading to the waste of energy and increasing cost. Herein, we report a Mo₂C/C/TCN heterojunction for overcoming these shortages through a combination system to realize H₂ generation and plastic reforming at the same time. Mo₂C/C/TCN, consisting of thiophene-embedded polymeric carbon nitride (TCN) and molybdenum carbide anchored on graphite nanosheet (Mo₂C/C), was prepared via electrostatic self-assembly. In the heterojunction, TCN performed as an electron donor, Mo₂C acted as an electron acceptor and H₂ evolution active center, while the graphite (C) in Mo₂C/C served as an electron transport medium. Owing to its hetero-structure, the visible light utilization efficiency as well as photoinduced charge separation and migration efficiency of the catalyst Mo₂C/C/TCN were greatly strengthened compared to the pristine polymeric carbon nitride (CN). As a result, Mo₂C/C/TCN exhibited satisfactory visible-light-driven waste plastic photoreforming and high H₂ generation activity. The optimized photocatalytic H₂ evolution rate over Mo₂C/C/TCN reached 188.7 μmol h⁻¹, which was 7.1 times of that over Pt/CN in 10 vol% triethanolamine (TEOA), far ahead of the research that has been reported. Additionally, Mo₂C/C/TCN exhibited adorable photoreforming efficiency of polylactic acid (PLA) and bisphenol A (BPA) under visible light. This work provides an efficient approach for lowering cost, enhancing optical absorption, and inhibiting charge recombination for higher photocatalytic performance and wilder applications.

中文翻译：

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构建 Mo2C/C/TCN 异质结，实现高效的无贵金属塑料光整和制氢


光催化分解水将太阳光直接转化为可储存的 H₂，但通常涉及使用空穴牺牲剂和贵金属助催化剂，导致能源浪费和成本增加。在此，我们报道了一种 Mo₂C/C/TCN 异质结，通过组合系统克服这些不足，同时实现 H₂ 发生和塑性重整。通过静电自组装制备了由噻吩包埋的聚合物氮化碳 （TCN） 和锚定在石墨纳米片 （Mo₂C/C） 上的碳化钼组成的 Mo₂C/C/TCN。在异质结中，TCN 充当电子供体，Mo₂C 充当电子受体和 H₂ 析出活性中心，而 Mo₂C/C 中的石墨 （C） 充当电子传递介质。由于其异质结构，与原始聚合物氮化碳 （CN） 相比，催化剂 Mo₂C/C/TCN 的可见光利用效率以及光诱导电荷分离和迁移效率大大增强。结果，Mo₂C/C/TCN 表现出令人满意的可见光驱动的废塑料光重整和高 H₂ 生成活性。Mo₂C/C/TCN 上的优化光催化 H₂ 析出速率达到 188.7 μmol ^h-1，是 10 vol% 三乙醇胺 （TEOA） 中 Pt/CN 的 7.1 倍，遥遥领先于已报道的研究。此外，Mo₂C/C/TCN 在可见光下表现出可爱的聚乳酸 （PLA） 和双酚 A （BPA） 光重整效率。 这项工作为降低成本、增强光吸收和抑制电荷复合提供了一种有效的方法，以实现更高的光催化性能和更广阔的应用。