Graphene quantum dot engineered nickel-cobalt phosphide as highly efficient bifunctional catalyst for overall water splitting
Graphene quantum dot (GQD) is the most recent addition to the nanocarbon materials family which promises a wide spectrum of novel applications. On the other hand, bimetallic phosphides are emerging for their unique potentials for electrocatalysis. Herein, we have demonstrated the fabrication of hete...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | English |
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2020
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| Online Access: | https://hdl.handle.net/10356/137063 |
| _version_ | 1811690872268390400 |
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| author | Tian, Jingqi Chen, Jie Liu, Jiyang Tian, Qinghua Chen, Peng |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Tian, Jingqi Chen, Jie Liu, Jiyang Tian, Qinghua Chen, Peng |
| author_sort | Tian, Jingqi |
| collection | NTU |
| description | Graphene quantum dot (GQD) is the most recent addition to the nanocarbon materials family which promises a wide spectrum of novel applications. On the other hand, bimetallic phosphides are emerging for their unique potentials for electrocatalysis. Herein, we have demonstrated the fabrication of heterostructured nanosheet arrays of ternary nickel-cobalt phosphide (NiCo2P2) and GQD hybrid (NCP/G NSs) and the use as bifunctional catalysts for overall water splitting in alkaline medium. NCP/G NSs exhibit excellent electrocatalytic activity towards hydrogen evolution reaction (reaching 100 mA cm−2 at an extremely low overpotential of 119 mV), superior to any other non-noble metal catalyst. Furthermore, an electrolyzer equipped with two identical NCP/G NS electrodes at an exceptionally small amount of catalyst loading (0.31 mg cm−2) is able to achieve efficient overall water splitting (10 mA cm−2 at 1.61 V) with high stability. The careful comparison with NiCo2P2 nanowires (NCP NWs) synthesized under the same conditions without GQDs (in terms of electrocatalytic performance, atomic and electronic structures, and electrochemical properties) reveals the mechanistic roles of GQDs in morphology control and performance enhancement. In addition, the performance comparison with ternary nickel-cobalt oxide (NiCo2O4) and GQD hybrid (NCO/G NSs) suggests the advantage of bimetallic phosphides over oxide counterparts. |
| first_indexed | 2024-10-01T06:10:54Z |
| format | Journal Article |
| id | ntu-10356/137063 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:10:54Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1370632023-12-29T06:50:24Z Graphene quantum dot engineered nickel-cobalt phosphide as highly efficient bifunctional catalyst for overall water splitting Tian, Jingqi Chen, Jie Liu, Jiyang Tian, Qinghua Chen, Peng School of Chemical and Biomedical Engineering Engineering::Bioengineering Water Splitting Electrocatalysis Graphene quantum dot (GQD) is the most recent addition to the nanocarbon materials family which promises a wide spectrum of novel applications. On the other hand, bimetallic phosphides are emerging for their unique potentials for electrocatalysis. Herein, we have demonstrated the fabrication of heterostructured nanosheet arrays of ternary nickel-cobalt phosphide (NiCo2P2) and GQD hybrid (NCP/G NSs) and the use as bifunctional catalysts for overall water splitting in alkaline medium. NCP/G NSs exhibit excellent electrocatalytic activity towards hydrogen evolution reaction (reaching 100 mA cm−2 at an extremely low overpotential of 119 mV), superior to any other non-noble metal catalyst. Furthermore, an electrolyzer equipped with two identical NCP/G NS electrodes at an exceptionally small amount of catalyst loading (0.31 mg cm−2) is able to achieve efficient overall water splitting (10 mA cm−2 at 1.61 V) with high stability. The careful comparison with NiCo2P2 nanowires (NCP NWs) synthesized under the same conditions without GQDs (in terms of electrocatalytic performance, atomic and electronic structures, and electrochemical properties) reveals the mechanistic roles of GQDs in morphology control and performance enhancement. In addition, the performance comparison with ternary nickel-cobalt oxide (NiCo2O4) and GQD hybrid (NCO/G NSs) suggests the advantage of bimetallic phosphides over oxide counterparts. MOE (Min. of Education, S’pore) Accepted version 2020-02-18T05:35:38Z 2020-02-18T05:35:38Z 2018 Journal Article Tian, J., Chen, J., Liu, J., Tian, Q., & Chen, P. (2018). Graphene quantum dot engineered nickel-cobalt phosphide as highly efficient bifunctional catalyst for overall water splitting. Nano Energy, 48, 284-291. doi:10.1016/j.nanoen.2018.03.063 2211-2855 https://hdl.handle.net/10356/137063 10.1016/j.nanoen.2018.03.063 2-s2.0-85052846366 48 284 291 en Nano Energy © 2018 Elsevier Ltd. All rights reserved. This paper was published in Nano Energy and is made available with permission of Elsevier Ltd. application/pdf |
| spellingShingle | Engineering::Bioengineering Water Splitting Electrocatalysis Tian, Jingqi Chen, Jie Liu, Jiyang Tian, Qinghua Chen, Peng Graphene quantum dot engineered nickel-cobalt phosphide as highly efficient bifunctional catalyst for overall water splitting |
| title | Graphene quantum dot engineered nickel-cobalt phosphide as highly efficient bifunctional catalyst for overall water splitting |
| title_full | Graphene quantum dot engineered nickel-cobalt phosphide as highly efficient bifunctional catalyst for overall water splitting |
| title_fullStr | Graphene quantum dot engineered nickel-cobalt phosphide as highly efficient bifunctional catalyst for overall water splitting |
| title_full_unstemmed | Graphene quantum dot engineered nickel-cobalt phosphide as highly efficient bifunctional catalyst for overall water splitting |
| title_short | Graphene quantum dot engineered nickel-cobalt phosphide as highly efficient bifunctional catalyst for overall water splitting |
| title_sort | graphene quantum dot engineered nickel cobalt phosphide as highly efficient bifunctional catalyst for overall water splitting |
| topic | Engineering::Bioengineering Water Splitting Electrocatalysis |
| url | https://hdl.handle.net/10356/137063 |
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