期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.065502
关键词
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资金
- Technical University of Denmark
- Danish Research Council for Technology and Production [12-126194]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences Biosciences
- U.S. Department of Energy [DE-AC05-76RL01830]
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- Advanced Materials for Energy-Water Systems (AMEWS) Center, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences
Improving our experimental and theoretical knowledge of electric potentials at liquid-solid boundaries is essential to achieve a deeper understanding of the driving forces behind interfacial processes. Electron holography has proved successful in probing solid-solid interfaces but requires knowledge of the materials' mean inner potential (MIP, V-0), which is a fundamental bulk material property. Combining off-axis electron holography with liquid phase transmission electron microscopy (LPTEM), we provide the first quantitative MIP determination of liquid water V-0 = +4.48 +/- 0.19 V. This value is larger than most theoretical predictions, and to explain the disagreement we assess the dominant factors needed in quantum simulations of liquid water. A precise MIP lays the foundations for nanoscale holographic potential measurements in liquids, and provides a benchmark to improve quantum mechanical descriptions of aqueous systems and their interfaces in, e.g., electrochemistry, solvation processes, and spectroscopy.
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