Synthesis of La2NiMnO6 Double Perovskite as a Highly Selective Electrocatalyst for Oxygen Reduction to Hydrogen Peroxide in Electrochemical Energy Conversion

Hossain MI, Monim SA, Moushumy ZM, Khansur NH, Mahmud I, Rahaman M, Aldalbahi A, Firoz SH, Hasnat MA (2025)

Publication Type: Journal article

Publication year: 2025

Journal

ACS Applied Energy Materials American Chemical Society

Book Volume: 8

Pages Range: 949-963

Journal Issue: 2

DOI: 10.1021/acsaem.4c02469

Abstract

Oxygen reduction reaction (ORR), a key process in sustainable energy conversion, utilizing a perovskite catalyst to achieve higher currents at lower overpotentials along with the production of value-added product hydrogen peroxide (H2O2), serves the dual functionality of both energy production and a green route for H2O2 generation. Here, we report the synthesis of a highly efficient double perovskite La2NiMnO6 (LNMO), achieved through the incorporation of two transition metals, Ni and Mn, in the perovskite structure, and explore its activity for ORR. During ORR at a rotation rate of 1600 rpm in 1.0 M NaOH, LNMO exhibits an onset potential of 0.75 V (corresponding to a current density of 0.1 mA cm-2) and a Tafel slope of 95 mV dec-1, achieving over 88% H2O2 selectivity and 73% faradaic efficiency across a wide potential range of 0.2-0.6 V vs RHE. Characterization techniques including OCP, EIS, ICP-OES, XRD, XPS, FE-SEM, and FTIR confirmed the successful preparation of LNMO and its catalytic activity. The kinetic investigation unveiled by the transfer coefficient (α) demonstrated that ORR on the LNMO surface followed a stepwise mechanism, involving an overall two irreversible electron transfer steps, where the first electron transfer was the rate-determining step. The analyses further revealed a diffusion-limited process for ORR accompanied by first-order kinetics with a standard rate constant (k0) of 3.97 × 10-3 cm s-1 and a formal potential (E0) value of 0.96 V vs RHE. Finally, a stability test via chronoamperometry showed that LNMO outperformed the Pt/C catalyst.

Authors with CRIS profile

Neamul Hayet Khansur Lehrstuhl für Glas und Keramik (WW3)

Involved external institutions

Eastern University BD Bangladesh (BD) Bangladesh University of Engineering and Technology / বাংলাদেশ প্রকৌশল বিশ্ববিদ্যালয় (BUET) BD Bangladesh (BD) Shahjalal University of Science and Technology BD Bangladesh (BD) Kumamoto University / 熊本大学 JP Japan (JP)

How to cite

APA:

Hossain, M.I., Monim, S.A., Moushumy, Z.M., Khansur, N.H., Mahmud, I., Rahaman, M.,... Hasnat, M.A. (2025). Synthesis of La2NiMnO6 Double Perovskite as a Highly Selective Electrocatalyst for Oxygen Reduction to Hydrogen Peroxide in Electrochemical Energy Conversion. ACS Applied Energy Materials, 8(2), 949-963. https://doi.org/10.1021/acsaem.4c02469

MLA:

Hossain, Mohammad Imran, et al. "Synthesis of La2NiMnO6 Double Perovskite as a Highly Selective Electrocatalyst for Oxygen Reduction to Hydrogen Peroxide in Electrochemical Energy Conversion." ACS Applied Energy Materials 8.2 (2025): 949-963.

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