Exceptionally Stable And Super‐Efficient Electrocatalysts Derived From Semiconducting Metal Phosphonate Frameworks

Two new isostructural semiconducting metal‐phosphonate frameworks are reported. Co2[1,4‐NDPA] and Zn2[1,4‐NDPA] (1,4‐NDPA4− is 1,4‐naphthalenediphosphonate) have optical bandgaps of 1.7 eV and 2.5 eV, respectively. The electrocatalyst derived from Co2[1,4‐NPDA] as a precatalyst generated a low overp...

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Veröffentlicht in:Chemistry : a European journal 2024-01, Vol.30 (1), p.e202302765-n/a
Hauptverfasser: Beglau, Thi Hai Yen, Fetzer, Marcus N. A., Boldog, Istvan, Heinen, Tobias, Suta, Markus, Janiak, Christoph, Yücesan, Gündoğ
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Sprache:eng
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Zusammenfassung:Two new isostructural semiconducting metal‐phosphonate frameworks are reported. Co2[1,4‐NDPA] and Zn2[1,4‐NDPA] (1,4‐NDPA4− is 1,4‐naphthalenediphosphonate) have optical bandgaps of 1.7 eV and 2.5 eV, respectively. The electrocatalyst derived from Co2[1,4‐NPDA] as a precatalyst generated a low overpotential of 374 mV in the oxygen evolution reaction (OER) with a Tafel slope of 43 mV dec−1 at a current density of 10 mA cm−2 in alkaline electrolyte (1 mol L−1 KOH), which is indicative of remarkably superior reaction kinetics. Benchmarking of the OER of Co2[1,4‐NPDA] material as a precatalyst coupled with nickel foam (NF) showed exceptional long‐term stability at a current density of 50 mA cm−2 for water splitting compared to the state‐of‐the‐art Pt/C/RuO2@NF after 30 h in 1 mol L−1 KOH. In order to further understand the OER mechanism, the transformation of Co2[1,4‐NPDA] into its electrocatalytically active species was investigated. Two isostructural semiconducting metal phosphonate frameworks, Co2[1,4‐NDPA] and Zn2[1,4‐NDPA] (1,4‐NDPA4− is 1,4‐naphthalenediphosphonate), are reported which have optical bandgaps within the semiconducting regime (1.7 eV and 2.5 eV, respectively),. The electrocatalyst derived from Co2[1,4‐NPDA] as a precatalyst holds potential in the oxygen evolution reaction (OER).
ISSN:0947-6539
1521-3765
1521-3765
DOI:10.1002/chem.202302765