High-yield electrochemical production of large-sized and thinly layered NiPS3 flakes for overall water splitting

Xinzhe Li, Yiyun Fang, Jun Wang, Bin Wei, Kun Qi, Hui Ying Hoh, Qiaoyan Hao, Tao Sun, Zhongchang Wang, Zongyou Yin, Yupeng Zhang, Jiong Lu, Qiaoliang Bao, Chenliang Su

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

Achieving large-sized and thinly layered 2D metal phosphorus trichalcogenides with high quality and yield has been an urgent quest due to extraordinary physical/chemical characteristics for multiple applications. Nevertheless, current preparation methodologies suffer from uncontrolled thicknesses, uneven morphologies and area distributions, long processing times, and inferior quality. Here, a sonication-free and fast (in minutes) electrochemical cathodic exfoliation approach is reported that can prepare large-sized (typically ≈150 µm2) and thinly layered (≈70% monolayer) NiPS3 flakes with high crystallinity and pure phase structure with a yield ≈80%. During the electrochemical exfoliation process, the tetra-n-butylammonium salt with a large ionic diameter is decomposed into gaseous species after the intercalation and efficiently expands the tightly stratified bulk NiPS3 crystals, as revealed by in situ and ex situ characterizations. Atomically thin NiPS3 flakes can be obtained by slight manual shaking rather than sonication, which largely preserves in-plane structural integrity with large size and minimum damage. The obtained high quality NiPS3 offers a new and ideal model for overall water splitting due to its inherent fully exposed S and P atoms that are often the active sites for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Consequently, the bifunctional NiPS3 exhibits outstanding performance for overall water splitting.

Original languageEnglish
Article number1902427
Number of pages10
JournalSmall
Volume15
Issue number30
DOIs
Publication statusPublished - 26 Jul 2019

Keywords

  • 2D materials
  • bifunctional
  • electrochemical exfoliation
  • NiPS
  • overall water splitting

Cite this

Li, Xinzhe ; Fang, Yiyun ; Wang, Jun ; Wei, Bin ; Qi, Kun ; Hoh, Hui Ying ; Hao, Qiaoyan ; Sun, Tao ; Wang, Zhongchang ; Yin, Zongyou ; Zhang, Yupeng ; Lu, Jiong ; Bao, Qiaoliang ; Su, Chenliang. / High-yield electrochemical production of large-sized and thinly layered NiPS3 flakes for overall water splitting. In: Small. 2019 ; Vol. 15, No. 30.
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title = "High-yield electrochemical production of large-sized and thinly layered NiPS3 flakes for overall water splitting",
abstract = "Achieving large-sized and thinly layered 2D metal phosphorus trichalcogenides with high quality and yield has been an urgent quest due to extraordinary physical/chemical characteristics for multiple applications. Nevertheless, current preparation methodologies suffer from uncontrolled thicknesses, uneven morphologies and area distributions, long processing times, and inferior quality. Here, a sonication-free and fast (in minutes) electrochemical cathodic exfoliation approach is reported that can prepare large-sized (typically ≈150 µm2) and thinly layered (≈70{\%} monolayer) NiPS3 flakes with high crystallinity and pure phase structure with a yield ≈80{\%}. During the electrochemical exfoliation process, the tetra-n-butylammonium salt with a large ionic diameter is decomposed into gaseous species after the intercalation and efficiently expands the tightly stratified bulk NiPS3 crystals, as revealed by in situ and ex situ characterizations. Atomically thin NiPS3 flakes can be obtained by slight manual shaking rather than sonication, which largely preserves in-plane structural integrity with large size and minimum damage. The obtained high quality NiPS3 offers a new and ideal model for overall water splitting due to its inherent fully exposed S and P atoms that are often the active sites for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Consequently, the bifunctional NiPS3 exhibits outstanding performance for overall water splitting.",
keywords = "2D materials, bifunctional, electrochemical exfoliation, NiPS, overall water splitting",
author = "Xinzhe Li and Yiyun Fang and Jun Wang and Bin Wei and Kun Qi and Hoh, {Hui Ying} and Qiaoyan Hao and Tao Sun and Zhongchang Wang and Zongyou Yin and Yupeng Zhang and Jiong Lu and Qiaoliang Bao and Chenliang Su",
year = "2019",
month = "7",
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Li, X, Fang, Y, Wang, J, Wei, B, Qi, K, Hoh, HY, Hao, Q, Sun, T, Wang, Z, Yin, Z, Zhang, Y, Lu, J, Bao, Q & Su, C 2019, 'High-yield electrochemical production of large-sized and thinly layered NiPS3 flakes for overall water splitting', Small, vol. 15, no. 30, 1902427. https://doi.org/10.1002/smll.201902427

High-yield electrochemical production of large-sized and thinly layered NiPS3 flakes for overall water splitting. / Li, Xinzhe; Fang, Yiyun; Wang, Jun; Wei, Bin; Qi, Kun; Hoh, Hui Ying; Hao, Qiaoyan; Sun, Tao; Wang, Zhongchang; Yin, Zongyou; Zhang, Yupeng; Lu, Jiong; Bao, Qiaoliang; Su, Chenliang.

In: Small, Vol. 15, No. 30, 1902427, 26.07.2019.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - High-yield electrochemical production of large-sized and thinly layered NiPS3 flakes for overall water splitting

AU - Li, Xinzhe

AU - Fang, Yiyun

AU - Wang, Jun

AU - Wei, Bin

AU - Qi, Kun

AU - Hoh, Hui Ying

AU - Hao, Qiaoyan

AU - Sun, Tao

AU - Wang, Zhongchang

AU - Yin, Zongyou

AU - Zhang, Yupeng

AU - Lu, Jiong

AU - Bao, Qiaoliang

AU - Su, Chenliang

PY - 2019/7/26

Y1 - 2019/7/26

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AB - Achieving large-sized and thinly layered 2D metal phosphorus trichalcogenides with high quality and yield has been an urgent quest due to extraordinary physical/chemical characteristics for multiple applications. Nevertheless, current preparation methodologies suffer from uncontrolled thicknesses, uneven morphologies and area distributions, long processing times, and inferior quality. Here, a sonication-free and fast (in minutes) electrochemical cathodic exfoliation approach is reported that can prepare large-sized (typically ≈150 µm2) and thinly layered (≈70% monolayer) NiPS3 flakes with high crystallinity and pure phase structure with a yield ≈80%. During the electrochemical exfoliation process, the tetra-n-butylammonium salt with a large ionic diameter is decomposed into gaseous species after the intercalation and efficiently expands the tightly stratified bulk NiPS3 crystals, as revealed by in situ and ex situ characterizations. Atomically thin NiPS3 flakes can be obtained by slight manual shaking rather than sonication, which largely preserves in-plane structural integrity with large size and minimum damage. The obtained high quality NiPS3 offers a new and ideal model for overall water splitting due to its inherent fully exposed S and P atoms that are often the active sites for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Consequently, the bifunctional NiPS3 exhibits outstanding performance for overall water splitting.

KW - 2D materials

KW - bifunctional

KW - electrochemical exfoliation

KW - NiPS

KW - overall water splitting

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