Journal
ACS SENSORS
Volume 7, Issue 1, Pages 338-344Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.1c02729
Keywords
nanopipette; resistant pulse; single particle; morphology; catalytic ability
Funding
- Natural Science Foundation of China [21975082, 21874047]
- Guangdong Basic and Applied B a s i c Re s e a r c h Fo u n d a t i o n [2019A1515011472]
- Science and Technology Program of Guangzhou [202102080479]
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This study reports a nanopore-based strategy to evaluate and compare the catalytic ability of single MnO2 catalyst particles with different morphologies by monitoring the generated O-2 bubbles from the catalytic decomposition of H2O2.
Investigating the catalytic ability of an individual catalyst particle helps to understand heterogeneity and can provide new insights into the synthesis of high-efficiency catalysts. Solid-state nanopores have become a promising tool for detecting single molecules/particles due to their high temporal and spatial resolution. Here, we report a nanopore-based strategy for the evaluation and comparison of a single MnO2 catalyst particle with different morphologies by monitoring the generated O-2 bubbles from the catalytic decomposition of H2O2. The finite element simulation was introduced to account for the flow velocity and bubble-induced current variation in the nanopore. In particular, the differences in catalytic ability of spherical and cubic MnO2 have been studied by calculating the production rate and volume of O-2. It demonstrates that the shape of a single MnO2 catalyst particle has a significant effect on its catalytic activity indeed.
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