High-throughput screening system for catalytic hydrogen-producing materials.
High-throughput screening system for catalytic hydrogen-producing materials.
复制标题
催化制氢材料高通量筛选系统。
DOI：
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发表时间：
2002
影响因子：
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通讯作者：
E. McFarland
中科院分区：
文献类型：
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作者：
T. Jaramillo;Anna N. Ivanovskaya;E. McFarland
开发了一种高通量筛选系统和方法，用于生产催化材料的氢气(H(2))文库。该体系基于WO(3)的化学光学性质，在H(2)的存在下，WO(3)的反射系数发生变化。合成了Pd包覆的WO(3)传感器，并测试了其氢气灵敏度、波长相关反射率和在水蒸气存在下的性能。为了高通量筛选，设计和建造了一个聚丙烯反应器模块，以容纳以薄膜形式沉积的8×12催化剂库。当库和反应块组装在一起时，就形成了96个独立的微反应单元。大面积的Pd/WO(3)传感器薄膜覆盖和密封了所有的微反应器，形成了一个96元的二维H(2)传感器阵列。由于H(2)的产生在整个库中是不同的，Pd/WO(3)薄膜的反射率变化由反射率传感器监测，该传感器每30 S扫描一次表面。反射率随时间的变化指示H(2)的相对产生速率。以钛、铂、镍、金、钯、铝、银、锗及其混合物为原料合成了阴极电催化剂库，展示了H(2)的高通量筛选体系。电解筛选的结果与预期的文献趋势一致：镍和含铂、钯的样品的混合物产生H(2)的速率最快，而Ge和Ti基材料的电催化剂效果最差。发现80%Al和20%Pt的混合物具有最高的H(2)产生率。这种高通量筛选系统适用于氢气是所需产品的各种催化筛选应用。
A high-throughput screening system and methodology were developed for libraries of hydrogen (H(2)) producing catalytic materials. The system is based on the chemo-optical properties of WO(3), which give rise to reflectance changes in the presence of H(2). Pd-coated WO(3) sensors were synthesized and examined for their hydrogen sensitivity, wavelength-dependent reflectance, and performance in the presence of water vapor. For high-throughput screening, a polypropylene reactor block was designed and constructed to house 8 x 12 catalyst libraries deposited as thin films. When the library and reactor block are assembled together, 96 independent microreactor units are formed. A large-area Pd/WO(3) sensor film covers and seals all microreactors, forming a 96-element 2-D H(2) sensor array. As H(2) is produced differentially across the library, the reflectance changes of the Pd/WO(3) film are monitored by reflectivity sensors that scan the surface every 30 s. The time-dependent changes in reflectance indicate relative rates of H(2) production. A library of cathode electrocatalysts was synthesized from Ti, Pt, Ni, Au, Pd, Al, Ag, Ge, and mixtures thereof to demonstrate the H(2) high-throughput screening system. The results of the electrolytic screening are in agreement with expected literature trends: mixtures of Ni and samples containing Pt and Pd generated H(2) at the greatest rates, while Ge- and Ti-based materials were the least effective electrocatalysts. A mixture of 80% Al and 20% Pt was found to have the highest rate of H(2) production. This high-throughput screening system is applicable in a variety of catalytic screening applications where hydrogen is the desired product.