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Barik S, Kharabe GP, Illathvalappil R, Singh CP, Kanheerampockil F, Walko PS, Bhat SK, Devi RN, Vinod CP, Krishnamurty S, Kurungot S. Active Site Engineering and Theoretical Aspects of "Superhydrophilic" Nanostructure Array Enabling Efficient Overall Water Electrolysis. Small 2023:e2304143. [PMID: 37612811 DOI: 10.1002/smll.202304143] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 07/21/2023] [Indexed: 08/25/2023]
Abstract
The rational design of noble metal-free electrocatalysts holds great promise for cost-effective green hydrogen generation through water electrolysis. In this context, here, the development of a superhydrophilic bifunctional electrocatalyst that facilitates both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline conditions is demonstrated. This is achieved through the in situ growth of hierarchical NiMoO4 @CoMoO4 ·xH2 O nanostructure on nickel foam (NF) via a two-step hydrothermal synthesis method. NiMoO4 @CoMoO4 ·xH2 O/NF facilitates OER and HER at the overpotentials of 180 and 220 mV, respectively, at the current density of 10 mA cm-2 . The NiMoO4 @CoMoO4 ·xH2 O/NF ǁ NiMoO4 @CoMoO4 ·xH2 O/NF cell can be operated at a potential of 1.60 V compared to 1.63 V displayed by the system based on the Pt/C@NFǁRuO2 @NF standard electrode pair configuration at 10 mA cm-2 for overall water splitting. The density functional theory calculations for the OER process elucidate that the lowest ΔG of NiMoO4 @CoMoO4 compared to both Ni and NiMoO4 is due to the presence of Co in the OER catalytic site and its synergistic interaction with NiMoO4 . The preparative strategy and mechanistic understanding make the windows open for the large-scale production of the robust and less expensive electrode material for the overall water electrolysis.
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Affiliation(s)
- Sidharth Barik
- Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India
- Academy of Scientific and Innovative Research, Postal Staff College Area, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201002, India
| | - Geeta Pandurang Kharabe
- Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India
- Academy of Scientific and Innovative Research, Postal Staff College Area, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201002, India
| | - Rajith Illathvalappil
- Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India
- Academy of Scientific and Innovative Research, Postal Staff College Area, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201002, India
| | - Chandrodai Pratap Singh
- Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India
- Academy of Scientific and Innovative Research, Postal Staff College Area, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201002, India
| | - Fayis Kanheerampockil
- Academy of Scientific and Innovative Research, Postal Staff College Area, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201002, India
- Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India
| | - Priyanka S Walko
- Academy of Scientific and Innovative Research, Postal Staff College Area, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201002, India
- Catalysis and Inorganic Chemistry Division CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India
| | - Suresh K Bhat
- Academy of Scientific and Innovative Research, Postal Staff College Area, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201002, India
- Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India
| | - R Nandini Devi
- Academy of Scientific and Innovative Research, Postal Staff College Area, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201002, India
- Catalysis and Inorganic Chemistry Division CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India
| | - C P Vinod
- Academy of Scientific and Innovative Research, Postal Staff College Area, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201002, India
- Catalysis and Inorganic Chemistry Division CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India
| | - Sailaja Krishnamurty
- Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India
- Academy of Scientific and Innovative Research, Postal Staff College Area, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201002, India
| | - Sreekumar Kurungot
- Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra, 411008, India
- Academy of Scientific and Innovative Research, Postal Staff College Area, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh, 201002, India
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