The self-assemble 0.5Pt-ZnIn2S4/rGO/Co3O4-BiVO4 (110) Z-scheme system photocatalysts were synthesized successfully, in which 0.5Pt-ZnIn2S4, rGO and Co3O4-BiVO4 (110) were as H2-photocatalyst, electron mediator and O2-photocatalyst, respectively. Herein, the preferred exposed (110) crystal facets of BiVO4 have great contribution to optimizing its photocatalytic oxidation performance. The Z-scheme system samples were used for photocatalytic water splitting to H2 and O2 in stoichiometric ratio without any sacrificial agents under visible light irradiation. SEM results clearly revealed the morphology and structure of Pt-ZnIn2S4, rGO and Co3O4-BiVO4 (110), suggesting that the three samples closely contacted with each other. Thus the electrons in the Z-scheme photocatalyst system could flow continuously in the photocatalytic water splitting process, which would induce the highly separation rate of photoinduced charge carriers and then accelerated the photocatalytic performance. Furthermore, rGO and Co3O4 were shown to be the critical factors for the improvment of photoinduced electron–hole pairs, thereby influencing the photocatalytic performance. In 0.5Pt-ZnIn2S4/2rGO/5Co3O4-BiVO4 (110) photocatalyst, the amount of the H2 and O2 could reach 294.3 μmol/g and 143.4 μmol/g, respectively (in 12 h). The mechanism for the photocatalytic overall water splitting was also discussed in detail. We confirmed that Z-scheme 0.5Pt-ZnIn2S4/rGO/Co3O4-BiVO4 (110) exhibit photocatalytic overall water splitting into H2 and O2 (294.3 and 143.4 μmol/g in 12 h). Here, 0.5Pt-ZnIn2S4, rGO and Co3O4-BiVO4 (110) act as H2-photocatalyst, electron-mediator and O2-photocatalyst, respectively. And the contact interface is favourable and then helpful for the electrons flow continuously during the photocatalytic reaction process. The electron mediator rGO and cocatalyst Co3O4 are responsible for the photoactivity.

中文翻译：

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构建含有 ZnIn2S4、Co3O4 光沉积 BiVO4 (110) 面和 rGO 电子介体的 Z 型光催化剂，用于将水分解为 H2 和 O2

成功合成了自组装 0.5Pt-ZnIn2S4/rGO/Co3O4-BiVO4（110）Z 型体系光催化剂，其中 0.5Pt-ZnIn2S4、rGO 和 Co3O4-BiVO4（110）作为 H2-光催化剂、电子介体和O2-光催化剂，分别。在此，BiVO4优选的暴露（110）晶面对优化其光催化氧化性能有很大贡献。Z-scheme系统样品用于光催化水分解为化学计量比的H2和O2，在可见光照射下没有任何牺牲剂。SEM 结果清楚地揭示了 Pt-ZnIn2S4、rGO 和 Co3O4-BiVO4 (110) 的形貌和结构，表明这三个样品彼此紧密接触。因此Z型光催化体系中的电子可以在光催化分解水过程中连续流动，这将导致光生电荷载流子的高度分离率，从而加速光催化性能。此外，rGO和Co3O4被证明是改善光诱导电子-空穴对的关键因素，从而影响光催化性能。在0.5Pt-ZnIn2S4/2rGO/5Co3O4-BiVO4(110)光催化剂中，H2和O2的含量分别达到294.3 μmol/g和143.4 μmol/g（12 h）。还详细讨论了光催化全分解水的机理。我们证实Z-scheme 0.5Pt-ZnIn2S4/rGO/Co3O4-BiVO4 (110) 表现出光催化整体水分解成H2 和O2（12 小时内294.3 和143.4 μmol/g）。在这里，0.5Pt-ZnIn2S4、rGO 和 Co3O4-BiVO4 (110) 分别作为 H2 光催化剂、电子介体和 O2 光催化剂。并且接触界面有利于光催化反应过程中电子的连续流动。电子介体 rGO 和助催化剂 Co3O4 负责光活性。