A Defective PtCoO<sub>2</sub> 2D Conductor with Resistivity Lower than Pt: Design of Molten Salt Synthesis
Highly defective 2D layered molten salt synthesized polycrystalline PtCoO<sub>2</sub> is metallic down to 1.8 K with a resistivity of 1.36 ± 0.05 μΩ·cm at 300 K, which is an order lower than that of Pt. The design of NaCl-CoCl<sub>2</sub> molten salt and its chemistry for obtaining phase-pure PtCoO<sub>2</sub> are presented. Dynamic changes in liquidus temperatures brought about by the compositional changes of NaCl-CoCl<sub>2</sub> upon consumption of CoCl<sub>2</sub> during the reaction are constrained to be within ±35 °C by a predesigned salt mixture. Rietveld structural refinements of XRD and SAED confirm the <i>R</i>3̅<i>m</i> space group with predominant (00l) texturing. XPS reveals that Co and Pt are predominantly in +3 and +1 oxidation states, respectively. PtCoO<sub>2</sub> is paramagnetic due to the low-spin Co<sup>4+</sup>, which undergoes antiferromagnetic ordering around 14 K. The catalytic property of PtCoO<sub>2</sub> is investigated for H<sub>2</sub> sensing.
Authors
- E. Prabhu (ORCID: https://orcid.org/0000-0001-7082-0774)
- Nair Afijith Ravindranath (ORCID: https://orcid.org/0000-0003-2414-5557)
- K. I. Gnanasekar
- A. Sundaresan (ORCID: https://orcid.org/0000-0002-1613-3030)
- Lisa John (ORCID: https://orcid.org/0009-0001-0187-088X)
- V. Jayaraman (ORCID: https://orcid.org/0000-0002-8898-6913)
- Sajal K. Ghosh (ORCID: https://orcid.org/0000-0002-4974-7311)
- S. Murugesan (ORCID: https://orcid.org/0000-0001-5900-9534)
- Sudip Ghosh
Institutions
- Jawaharlal Nehru Centre for Advanced Scientific Research (IN)
- Homi Bhabha National Institute (IN)
- Indira Gandhi Centre for Atomic Research (IN)
Publication Details
- Journal
- Inorganic Chemistry
- Published
- 2025-09-22
- DOI
- https://doi.org/10.1021/acs.inorgchem.5c01896
- Primary Topic
- Gas Sensing Nanomaterials and Sensors
- Type
- article
- Field-Weighted Citation Impact
- 0.00