Skip to content
DraconiticResearch
Search Sources API
203,234 studies31 sourcesUpdated 10 min ago
Peer-reviewedCC BYLangmuir : the ACS journal of surfaces and colloids

From Surface Buffering to Bulk Ion Exchange: Mapping the Acid Response of Potassium Poly(Heptazine Imide) (K-PHI).

  • Julia Sinisi1,2
  • Gabriel A A Diab1,3
  • Titus Ekabat1,4
  • Sebastian Bette1
  • Viola Duppel1
  • Ivo F Teixeira3
  • Stefan Repp1
  • Bettina V Lotsch1,2
4 affiliations
  1. 1Nanochemistry Department, Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569Stuttgart, Germany.
  2. 2Department of Chemistry, Ludwig Maximilian University of Munich (LMU), Butenandtstr. 5-13, 81377Munich, Germany.
  3. 3Department of Chemistry, Federal University of São Carlos, 13565-905São Carlos, SP, Brazil.
  4. 4Department of Physics and Materials Science, Maseno University, Private Bag, 40105Maseno, Kenya.
Read full textPDFDOICite

Abstract

Potassium poly(heptazine imide) (K-PHI) is a promising material for photocatalysis and energy storage, yet its application in aqueous media is limited by protonation. Cation exchange to protonated poly(heptazine imide) (H-PHI) causes structural and optoelectronic changes. Herein, a systematic study of its acid stability regime and protonation threshold is presented through simultaneous consideration of PHI's bulk, interface, and solution properties. Down to pH 3.0, solutions are buffered by proton adsorption while the particle bulk retains structural integrity, pointing to coexistence of H+ at the surface and K+ in the bulk. Within this regime down to pH 4.0, buffering coincides with a stable zeta potential, consistent with proton adsorption balanced by counterions. At yet lower pH, the buffer limit (pH 3.0) is characterized by surface destabilization, suggesting proton excess. At pH 2.0, protonation proceeds via bulk ion exchange and H-PHI formation.

Related

  1. Reducibility, adsorption energies, surface acidity – fundamental material properties for fast oxygen exchange
    Matthäus Siebenhofer, Filip Grajkowski, Clément Nicollet +3
    Journal of Materials Chemistry APeer-reviewedCC BY 4.0Full text10 citedMaterials & polymersTheoretical & computational chemistryHAL
  2. Triaryl-Heptazine Photocatalysts for the Oxidation of C–H and C–C Bonds in Nitrogen-Containing Molecules
    Emeric Montinho-Inacio, Nicolas G-Simonian, Laurent Galmiche +4
    ACS CatalysisPeer-reviewedCC BY-NC-ND 4.0Full text3 citedCatalysisOrganic chemistryHAL
  3. Molecular Heptazine-Platinum Complexes to Model Metal-Support Coordination in Platinized Graphitic Carbon Nitride: Insights into Catalyst Stability and Support Suitability.
    Chi-Feng Lu, Tsu-Lien Hung, Jiliang Zhang +1
    Inorganic chemistryPeer-reviewedCC BYFull textOrganic chemistryEurope PMC
  4. Morphology-Dependent Excited-State Dynamics in Hollow Sphere Poly(Heptazine Imide) Photocatalysts
    Alexander Lange, Lingli Ni, Arindam Konar +9
    ChemRxivPreprintCC BYFull text1 citedGeneral chemistryChemRxiv
  5. Mycogenic synthesis of copper oxide nanoparticles using response surface methodology and assessment of their biological potential
    Nishi Thalaian, V. Venkateswara Sarma
    Brazilian Journal of MicrobiologyPeer-reviewedLicence not statedFull textMaterials & polymersPMC

Cite

BibTeXRIS
BibTeX
@article{sinisi2026from,
  title = {{From Surface Buffering to Bulk Ion Exchange: Mapping the Acid Response of Potassium Poly(Heptazine Imide) (K-PHI).}},
  author = {Julia Sinisi and Gabriel A A Diab and Titus Ekabat and Sebastian Bette and Viola Duppel and Ivo F Teixeira and Stefan Repp and Bettina V Lotsch},
  journal = {Langmuir : the ACS journal of surfaces and colloids},
  year = {2026},
  month = oct,
  doi = {10.1021/acs.langmuir.6c03166},
  url = {https://europepmc.org/article/MED/42918165},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - From Surface Buffering to Bulk Ion Exchange: Mapping the Acid Response of Potassium Poly(Heptazine Imide) (K-PHI).
AU  - Julia Sinisi
AU  - Gabriel A A Diab
AU  - Titus Ekabat
AU  - Sebastian Bette
AU  - Viola Duppel
AU  - Ivo F Teixeira
AU  - Stefan Repp
AU  - Bettina V Lotsch
PY  - 2026
DA  - 2026/10/01
JO  - Langmuir : the ACS journal of surfaces and colloids
DO  - 10.1021/acs.langmuir.6c03166
UR  - https://europepmc.org/article/MED/42918165
AB  - Potassium poly(heptazine imide) (K-PHI) is a promising material for photocatalysis and energy storage, yet its application in aqueous media is limited by protonation. Cation exchange to protonated poly(heptazine imide) (H-PHI) causes structural and optoelectronic changes. Herein, a systematic study of its acid stability regime and protonation threshold is presented through simultaneous consideration of PHI's bulk, interface, and solution properties. Down to pH 3.0, solutions are buffered by proton adsorption while the particle bulk retains structural integrity, pointing to coexistence of H+ at the surface and K+ in the bulk. Within this regime down to pH 4.0, buffering coincides with a stable zeta potential, consistent with proton adsorption balanced by counterions. At yet lower pH, the buffer limit (pH 3.0) is characterized by surface destabilization, suggesting proton excess. At pH 2.0, protonation proceeds via bulk ion exchange and H-PHI formation.
SN  - 0743-7463
SN  - 1520-5827
ER  -