Low cost & quasi solid state Na2Mn0.5Ni0.5Fe(CN)6//NaxFe2O3 hybrid Na-ion batteries for solar energy storage

Pappu Naskar, Shubhrajyoti Mondal, Biplab Biswas, Sourav Laha, Anjan Banerjee

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Herein, we have explored low cost Prussian blue analogues (PBA), namely Na2MnFe(CN)6 (Mn-PBA) and Na2Mn0.5Ni0.5Fe(CN)6 (MnNi-PBA), as positive electrodes and iron oxides, namely Fe2O3 and Na-incorporated Fe2O3 (NaxFe2O3), as negative electrodes for quasi solid state Na-ion batteries. The detailed electrochemical characterization reveals the fact that MnNi-PBA shows superior positive electrode performances to Mn-PBA, while NaxFe2O3 depicts improved negative electrode performances with respect to Fe2O3. The comparative electrode performance data are corroborated by bond-valence energy landscape (BVEL) and density of states (DOS) calculations. Moreover, a 1.6 V full cell with MnNi-PBA positive and NaxFe2O3 negative electrodes is assembled in organic-inorganic hybrid hydrogel electrolyte, which demonstrates a specific capacity of 48 mA h g−1 (@ 50 mA g−1), an energy density of 77 W h kg−1 (@ 118 W kg−1), a power density of 803 W kg−1 (@ 56 W h kg−1) and good cycle life (80% capacity retention after 250 cycles at 50 mA g−1) in the 0-1.6 V regime. Further, to validate the solar energy storage applications, a 3.2 V prototype device is fabricated by the series connection of two 1.6 V cells, which is capable to illuminate a 3 V/270 mW light-emitting diode (LED) setup, and successfully demonstrates a one week-long solar-charge/LED-discharge cycling module.

Original languageEnglish
Pages (from-to)4189-4201
Number of pages13
JournalSustainable Energy and Fuels
Issue number17
StatePublished - 17 Jul 2023
Externally publishedYes

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© 2023 The Royal Society of Chemistry.


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