Development of α‐MnO2 Nanowire with Ni and (Ni, Co) – Cation Doping as an Efficient Bifunctional Oxygen Evolution and Oxygen Reduction Reaction Catalysts

Selvakumar, Karuppiah, Duraisamy, Velu, Venkateshwaran, Selvaraj, Arumugam, Natarajan, Abdulrahman I., Almansour, Wang, Yucheng, Liu, Xiaoteng and Kumar, Sakkarapalayam Murugesan Senthil (2022) Development of α‐MnO2 Nanowire with Ni and (Ni, Co) – Cation Doping as an Efficient Bifunctional Oxygen Evolution and Oxygen Reduction Reaction Catalysts. ChemElectroChem, 9 (2). e202101303. ISSN 2196-0216

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Manganese oxides (MnO 2 ) with nanowire morphology materials are a promising candidate for improving oxygen evolution and oxygen reduction reaction (OER/ORR) performance. In this work, we developed transition metal cation doping strategy into the α-MnO 2 tunnel structure to tune the Mn oxidation states and control the uniform nanowire morphology, crystalline structure in order to investigate the effect of doping over bifunctional activity. The single Ni 2+ cation doping in α-MnO 2 with various loading concentrations resulted in 8Ni-MnO 2 exhibiting remarkable OER and ORR activity owing to their excessive concentration of Mn 3+ and Mn 4+ octahedral sites respectively. Further, Co 2+ cation doping in 8Ni-MnO 2 leads to an enhanced synergistic effect that significantly improves the fraction of Mn 3+ quantity which is confirmed by average oxidation state. For, electrochemical OER performance of 8Co-8Ni-MnO 2 exhibits a potential of 1.77 V, Tafel slope value of 68 mV dec -1 and lower charge transfer resistance and it is active in ORR with more positive onset potential of 0.90 V, half-wave potential of 0.80 V, better current density (4.7 mA cm -2 ) and a four-electron pathway. Moreover, bifunctional activity (ΔE = E OER @10 mA cm -2 – ORR@E 1/2 ) of 8Co-8Ni-MnO 2 demonstrated 0.97 V, indicates an excellent activity in alkaline electrolyte solution.

Item Type: Article
Additional Information: Funding information: We would like to acknowledge Director, CSIR-Central Electrochemical Research Institute (CECRI) for support and encouragement. Selvakumar thanks the financial support through the CSIR-HRDG, New Delhi, India for SRF (grant no. 31/20(159)2k17). The project was supported by Researchers Supporting Project number (RSP-2021/143), King Saud University, Riyadh, Saudi Arabia.
Uncontrolled Keywords: cobalt doping, manganese oxides, OER/ORR electrode, RRDE, Tafel slope
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: John Coen
Date Deposited: 13 Dec 2021 14:51
Last Modified: 09 Dec 2022 08:00

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