High-throughput measurement of the influence of pH on hydrogen production from BaTiO3/TiO2 core/shell photocatalysts
High-throughput measurement of the influence of pH on hydrogen production from BaTiO3/TiO2 core/shell photocatalysts
复制标题
DOI：
10.1016/j.apcatb.2020.118750
复制
发表时间：
2020-07
影响因子：
22.1
通讯作者：
Wenjia Song;Eric M. Lopato;S. Bernhard;P. Salvador;G. Rohrer
中科院分区：
文献类型：
--
作者：
Wenjia Song;Eric M. Lopato;S. Bernhard;P. Salvador;G. Rohrer
采用平行化自动光化学反应器（PAPCR）测定了4种不同BaTiO 3/TiO 2核壳型光催化剂及其组分的产氢速率随pH的变化，以确定光化学产氢的最佳结构和pH条件。通过氢敏感材料的颜色变化来量化由96反应器阵列中的每个反应器产生的氢的量。对于在600 °C下退火的核/壳光催化剂，在pH 3-9范围内，产氢速率随着pH的增加而增加，这归因于吸附了更多带负电的物质，使能带向上弯曲，促进了空穴传输到表面和氧化半反应。在中等pH值下，600 °C退火的核/壳催化剂具有最高的反应活性，表明BaTiO 3/TiO 2核/壳结构改善了载流子的产生和传输。结果表明，PAPCR是比较不同结构和不同操作条件下制氢催化剂性能的有效方法。
The rates of hydrogen production from four different BaTiO3/TiO2core/shell photocatalysts and their components were measured as a function of pH using a parallelized and automated photochemical reactor (PAPCR) to determine the optimized structure and pH condition for photochemical hydrogen production. The amount of hydrogen produced by each reactor in a 96-reactor array was quantified by the color change of a hydrogen-sensitive material. For the core/shell photocatalysts annealed at 600 °C, the increase in hydrogen production rate with pH at pH 3–9 is ascribed to the adsorption of more negatively charged species that bend the bands upward, promoting hole transport to the surface and the oxidation half reaction. At intermediate pH, the core/shell catalyst annealed at 600 °C had the highest reactivity, indicating that the generation and transport of charge carriers were improved by the BaTiO3/TiO2core/shell structure. The results demonstrate that PAPCR is an effective way to compare the performance of hydrogen-producing catalysts with different structures and in different operating conditions.