Hybrid Ni/NiO composite with N-doped activated carbon from waste cauliflower leaves : a sustainable bifunctional electrocatalyst for efficient water splitting
High-performance bifunctional electrocatalysts based on nickel/nickel oxide nanoparticles and nitrogen-doped activated carbon, derived from biomass waste (cauliflower leaves) were synthesized by a facile one-step process. The Ni and NiO compositions were controlled by varying the temperature during...
| Main Authors: | , , |
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| Format: | Journal Article |
| Language: | English |
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2021
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| Online Access: | https://hdl.handle.net/10356/152205 |
| _version_ | 1826122901573599232 |
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| author | Hoang, Van Chinh Dinh, Khang Ngoc Gomes, Vincent G. |
| author2 | Interdisciplinary Graduate School (IGS) |
| author_facet | Interdisciplinary Graduate School (IGS) Hoang, Van Chinh Dinh, Khang Ngoc Gomes, Vincent G. |
| author_sort | Hoang, Van Chinh |
| collection | NTU |
| description | High-performance bifunctional electrocatalysts based on nickel/nickel oxide nanoparticles and nitrogen-doped activated carbon, derived from biomass waste (cauliflower leaves) were synthesized by a facile one-step process. The Ni and NiO compositions were controlled by varying the temperature during pyrolysis, which had significant effects on the crystallographic structure of the resulting hybrid and electrocatalytic properties. The Ni/NiO/N-doped activated carbon obtained at 500 °C shows modest Tafel slopes of 70 and 121 mV dec⁻¹ along with overpotentials of 346 and 180 mV to drive a current density of 10 mA cm⁻² for oxygen evolution and hydrogen evolution reactions in 0.1 M KOH electrolyte. In a two-electrode electrolyser the hybrid bifunctional electrocatalyst requires only 1.688 V to reach 10 mA cm⁻² current density, confirming excellent rate capability and robust stability with variable current densities of 10–30 mA cm⁻². The electrocatalytic performance of the NiOₓ-AC-500 || NiOₓ-AC-500 cell is comparable to that of recently reported electrolysers. The superior electrocatalytic performance of our electrocatalyst is due to synergies between Ni and NiO in a hierarchically porous N-doped carbon structure, rich in active sites and efficient charge transfer. This work offers a sustainable approach to develop eco-friendly bifunctional electrocatalysts for high-performance water splitting. |
| first_indexed | 2024-10-01T05:55:52Z |
| format | Journal Article |
| id | ntu-10356/152205 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:55:52Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1522052021-08-06T07:31:05Z Hybrid Ni/NiO composite with N-doped activated carbon from waste cauliflower leaves : a sustainable bifunctional electrocatalyst for efficient water splitting Hoang, Van Chinh Dinh, Khang Ngoc Gomes, Vincent G. Interdisciplinary Graduate School (IGS) Energy Research Institute @ NTU (ERI@N) Science::Chemistry Doped Carbon Nickel Nanoparticles High-performance bifunctional electrocatalysts based on nickel/nickel oxide nanoparticles and nitrogen-doped activated carbon, derived from biomass waste (cauliflower leaves) were synthesized by a facile one-step process. The Ni and NiO compositions were controlled by varying the temperature during pyrolysis, which had significant effects on the crystallographic structure of the resulting hybrid and electrocatalytic properties. The Ni/NiO/N-doped activated carbon obtained at 500 °C shows modest Tafel slopes of 70 and 121 mV dec⁻¹ along with overpotentials of 346 and 180 mV to drive a current density of 10 mA cm⁻² for oxygen evolution and hydrogen evolution reactions in 0.1 M KOH electrolyte. In a two-electrode electrolyser the hybrid bifunctional electrocatalyst requires only 1.688 V to reach 10 mA cm⁻² current density, confirming excellent rate capability and robust stability with variable current densities of 10–30 mA cm⁻². The electrocatalytic performance of the NiOₓ-AC-500 || NiOₓ-AC-500 cell is comparable to that of recently reported electrolysers. The superior electrocatalytic performance of our electrocatalyst is due to synergies between Ni and NiO in a hierarchically porous N-doped carbon structure, rich in active sites and efficient charge transfer. This work offers a sustainable approach to develop eco-friendly bifunctional electrocatalysts for high-performance water splitting. The University of Sydney International Scholarship, Australian Centre for Microscopy and Microanalysis (ACMM), and Sydney Analytical, a core research facility at the University of Sydney are highly acknowledged. 2021-08-06T07:31:04Z 2021-08-06T07:31:04Z 2020 Journal Article Hoang, V. C., Dinh, K. N. & Gomes, V. G. (2020). Hybrid Ni/NiO composite with N-doped activated carbon from waste cauliflower leaves : a sustainable bifunctional electrocatalyst for efficient water splitting. Carbon, 157, 515-524. https://dx.doi.org/10.1016/j.carbon.2019.09.080 0008-6223 https://hdl.handle.net/10356/152205 10.1016/j.carbon.2019.09.080 2-s2.0-85074876613 157 515 524 en Carbon © 2019 Elsevier Ltd. All rights reserved. |
| spellingShingle | Science::Chemistry Doped Carbon Nickel Nanoparticles Hoang, Van Chinh Dinh, Khang Ngoc Gomes, Vincent G. Hybrid Ni/NiO composite with N-doped activated carbon from waste cauliflower leaves : a sustainable bifunctional electrocatalyst for efficient water splitting |
| title | Hybrid Ni/NiO composite with N-doped activated carbon from waste cauliflower leaves : a sustainable bifunctional electrocatalyst for efficient water splitting |
| title_full | Hybrid Ni/NiO composite with N-doped activated carbon from waste cauliflower leaves : a sustainable bifunctional electrocatalyst for efficient water splitting |
| title_fullStr | Hybrid Ni/NiO composite with N-doped activated carbon from waste cauliflower leaves : a sustainable bifunctional electrocatalyst for efficient water splitting |
| title_full_unstemmed | Hybrid Ni/NiO composite with N-doped activated carbon from waste cauliflower leaves : a sustainable bifunctional electrocatalyst for efficient water splitting |
| title_short | Hybrid Ni/NiO composite with N-doped activated carbon from waste cauliflower leaves : a sustainable bifunctional electrocatalyst for efficient water splitting |
| title_sort | hybrid ni nio composite with n doped activated carbon from waste cauliflower leaves a sustainable bifunctional electrocatalyst for efficient water splitting |
| topic | Science::Chemistry Doped Carbon Nickel Nanoparticles |
| url | https://hdl.handle.net/10356/152205 |
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