Layered crystalline and amorphous platinum disulfide (PtS₂) : contrasting electrochemistry
Group 6 transition metal dichalcogenides (TMDs), such as MoS2 and WS2 have been extensively studied for various applications while few studies have delved into other TMDs such as platinum dichalcogenides. In this work, layered crystalline and amorphous platinum disulfide (PtS2) were synthesized, cha...
| 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/10356/151620 |
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| author | Wang, Yong Szokolova, Katerina Muhammad Zafir Mohamad Nasir Sofer, Zdenek Pumera, Martin |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Wang, Yong Szokolova, Katerina Muhammad Zafir Mohamad Nasir Sofer, Zdenek Pumera, Martin |
| author_sort | Wang, Yong |
| collection | NTU |
| description | Group 6 transition metal dichalcogenides (TMDs), such as MoS2 and WS2 have been extensively studied for various applications while few studies have delved into other TMDs such as platinum dichalcogenides. In this work, layered crystalline and amorphous platinum disulfide (PtS2) were synthesized, characterised and their fundamental electrochemical properties were investigated. Both materials exhibited inherent oxidation and reduction reactions which would limit their operating potential window for sensing applications. Amorphous phase materials are considered to be promising electrocatalysts due to the porous, and nanostructured morphology with high concentration of unsaturated active sites. The electrocatalytic performances towards oxygen reduction (ORR) and hydrogen evolution reactions (HER) of crystalline and amorphous PtS2 were analysed. Amorphous PtS2 was found to exhibit superior electrocatalytic performances towards ORR and HER as compared to crystalline PtS2. For HER, amorphous and crystalline PtS2 have overpotential values of 0.30 V and 0.70 V (vs. RHE) at current density of 10 mA cm−2, respectively. The influence of electrochemical reduction pre-treatment on their catalytic behaviours was also investigated. Electrochemical reduction pre-treatment on both crystalline and amorphous PtS2 removed the oxidized sulfate groups and increased the proportion of Pt0 oxidation state which exposed more catalytic sites. As such, these materials were activated and displayed improved ORR and HER performances. Electrochemically reduced amorphous PtS2 outperformed the untreated counterparts and exhibited the best HER performance with overpotential of 0.17 V (vs. RHE) at current density of −10 mA cm−2. These findings provide insights into the electrochemical properties of noble metal PtS2 in both crystalline and amorphous states which can be activated by electrochemical reduction pre-treatment. |
| first_indexed | 2024-10-01T06:30:12Z |
| format | Journal Article |
| id | ntu-10356/151620 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:30:12Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1516202021-07-14T06:31:02Z Layered crystalline and amorphous platinum disulfide (PtS₂) : contrasting electrochemistry Wang, Yong Szokolova, Katerina Muhammad Zafir Mohamad Nasir Sofer, Zdenek Pumera, Martin School of Physical and Mathematical Sciences Science::Chemistry Amorphous Platinum Sulfide Crystalline Platinum Sulfide Group 6 transition metal dichalcogenides (TMDs), such as MoS2 and WS2 have been extensively studied for various applications while few studies have delved into other TMDs such as platinum dichalcogenides. In this work, layered crystalline and amorphous platinum disulfide (PtS2) were synthesized, characterised and their fundamental electrochemical properties were investigated. Both materials exhibited inherent oxidation and reduction reactions which would limit their operating potential window for sensing applications. Amorphous phase materials are considered to be promising electrocatalysts due to the porous, and nanostructured morphology with high concentration of unsaturated active sites. The electrocatalytic performances towards oxygen reduction (ORR) and hydrogen evolution reactions (HER) of crystalline and amorphous PtS2 were analysed. Amorphous PtS2 was found to exhibit superior electrocatalytic performances towards ORR and HER as compared to crystalline PtS2. For HER, amorphous and crystalline PtS2 have overpotential values of 0.30 V and 0.70 V (vs. RHE) at current density of 10 mA cm−2, respectively. The influence of electrochemical reduction pre-treatment on their catalytic behaviours was also investigated. Electrochemical reduction pre-treatment on both crystalline and amorphous PtS2 removed the oxidized sulfate groups and increased the proportion of Pt0 oxidation state which exposed more catalytic sites. As such, these materials were activated and displayed improved ORR and HER performances. Electrochemically reduced amorphous PtS2 outperformed the untreated counterparts and exhibited the best HER performance with overpotential of 0.17 V (vs. RHE) at current density of −10 mA cm−2. These findings provide insights into the electrochemical properties of noble metal PtS2 in both crystalline and amorphous states which can be activated by electrochemical reduction pre-treatment. M.P. acknowledges the financial support of Grant Agency of the Czech Republic (EXPRO:19-26896X). K.S. was supported by Specific University Research (MSMT No. 20-SVV/2019). This work was created with the financial support of the Neuron Foundation for science support. 2021-07-14T06:31:02Z 2021-07-14T06:31:02Z 2019 Journal Article Wang, Y., Szokolova, K., Muhammad Zafir Mohamad Nasir, Sofer, Z. & Pumera, M. (2019). Layered crystalline and amorphous platinum disulfide (PtS₂) : contrasting electrochemistry. Chemistry - A European Journal, 25(30), 7330-7338. https://dx.doi.org/10.1002/chem.201900331 0947-6539 0000-0001-5846-2951 https://hdl.handle.net/10356/151620 10.1002/chem.201900331 31063216 2-s2.0-85065437597 30 25 7330 7338 en Chemistry - A European Journal © 2019 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim. All rights reserved. |
| spellingShingle | Science::Chemistry Amorphous Platinum Sulfide Crystalline Platinum Sulfide Wang, Yong Szokolova, Katerina Muhammad Zafir Mohamad Nasir Sofer, Zdenek Pumera, Martin Layered crystalline and amorphous platinum disulfide (PtS₂) : contrasting electrochemistry |
| title | Layered crystalline and amorphous platinum disulfide (PtS₂) : contrasting electrochemistry |
| title_full | Layered crystalline and amorphous platinum disulfide (PtS₂) : contrasting electrochemistry |
| title_fullStr | Layered crystalline and amorphous platinum disulfide (PtS₂) : contrasting electrochemistry |
| title_full_unstemmed | Layered crystalline and amorphous platinum disulfide (PtS₂) : contrasting electrochemistry |
| title_short | Layered crystalline and amorphous platinum disulfide (PtS₂) : contrasting electrochemistry |
| title_sort | layered crystalline and amorphous platinum disulfide pts₂ contrasting electrochemistry |
| topic | Science::Chemistry Amorphous Platinum Sulfide Crystalline Platinum Sulfide |
| url | https://hdl.handle.net/10356/151620 |
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