Journal
SCIENCE ADVANCES
Volume 7, Issue 40, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abg8568
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Funding
- Swiss National Science Foundation (SNSF) [200021_192037]
- National Centre of Competence in Research Bio-Inspired Materials
- Center for Enhanced Nanofluidic Transport (CENT) - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0019112]
- Texas Advanced Computing Center (TACC) at The University of Texas at Austin [TG-CDA100010, DMR20002]
- Swedish Research Council through International Postdoc [2018-06764]
- Swiss National Science Foundation (SNF) [200021_192037] Funding Source: Swiss National Science Foundation (SNF)
- Swedish Research Council [2018-06764] Funding Source: Swedish Research Council
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Our study investigated the dynamics of protons at the interface between an hBN crystal and binary mixtures of water and organic amphiphilic solvents, showing a significant influence of solvation on interfacial dynamics. Solvent content has a nontrivial effect on interfacial dynamics, leading at intermediate water fraction to an increased surface diffusivity and an increased affinity of the proton charges to the solid surface. Our measurements provide evidence of the notable role of solvation on interfacial proton charge transport.
Our understanding of the dynamics of charge transfer between solid surfaces and liquid electrolytes has been hampered by the difficulties in obtaining interface, charge, and solvent-specific information at both high spatial and temporal resolution. Here, we measure at the single charge scale the dynamics of protons at the interface between an hBN crystal and binary mixtures of water and organic amphiphilic solvents (alcohols and acetone), evidencing a marked influence of solvation on interfacial dynamics. Applying single-molecule localization microscopy to emissive crystal defects, we observe correlated activation between adjacent ionizable surface defects, mediated by the transport of single excess protons along the solid/liquid interface. Solvent content has a nontrivial effect on interfacial dynamics, leading at intermediate water fraction to an increased surface diffusivity, as well as an increased affinity of the proton charges to the solid surface. Our measurements evidence the notable role of solvation on interfacial proton charge transport.
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