Abstract
The mechanism of formic acid decomposition on the Pd(111) surface has been investigated by several theoretical methods in previous studies, including PBE and PW91. These results indicated that the mechanism is different from different methods, and even by using the same method (i.e., PBE), the mechanism is also different. In this study, we have revisited the formic acid decomposition on Pd(111) surface by using another density functional RPBE and by including van der Waals interaction which is neglected in the previous studies. Our results showed that the formic acid is decomposed via O–H bond cleavage to form bi-HCOO*, and the most favorable pathway is HCOOH* → bi-HCOO* + H* → CO2* + 2H*. The energy barrier is 0.55 eV at the rate-determining step. This conclusion is consistent with one of the PBE study. This demonstrated that computational methods have a great influence on the reaction mechanism, and care should be taken in selecting the appropriate computational methods.
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Acknowledgements
The computational time is supported by the high-performance computing center of Jilin University, computing center of Jilin Province, and computing center of Changchun Institute of Applied Chemistry.
Funding
This work is supported by the National Natural Science Foundation of China (21733004, 21673220) and the National Key Research and Development Program of China (2016YFA0602900).
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Ni Wang made the calculations, wrote the paper, and participated in the interpretation of the data. Kai Li and Ying Wang analyzed the data and revised the paper. Zhijian Wu proposed the project, participated in the structure design, mechanism analysis, and revision of the paper.
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The concept of the rate-determining steps and rate-determining states are discussed and the corresponding calculations based on the rate-determining states are listed in Figure S1. Table S1 is the calculated adsorption energies for the most stable adsorbed species on formic acid dissociation by RPBE with D2 and D3 method, respectively. (DOCX 43 KB)
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Wang, N., Li, K., Wang, Y. et al. Density functional study on formic acid decomposition on Pd(111) surface: a revisit and comparison with other density functional methods. J Mol Model 27, 285 (2021). https://doi.org/10.1007/s00894-021-04903-0
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DOI: https://doi.org/10.1007/s00894-021-04903-0