Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution
Sulfur (S) vacancies in MoS2 have been found to act as a new active center, which shows an unprecedented intrinsic HER activity under elastic strain. However, such S-vacancies are unstable and the activities are very sensitive to the vacancy concentration. A strategy to stabilize these abundant acti...
| Main Authors: | , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/142143 |
| _version_ | 1826127903223447552 |
|---|---|
| author | Zhao, Yunxing Tang, Michael T. Wu, Sudong Geng, Jing Han, Zhaojun Chan, Karen Gao, Pingqi Li, Hong |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Zhao, Yunxing Tang, Michael T. Wu, Sudong Geng, Jing Han, Zhaojun Chan, Karen Gao, Pingqi Li, Hong |
| author_sort | Zhao, Yunxing |
| collection | NTU |
| description | Sulfur (S) vacancies in MoS2 have been found to act as a new active center, which shows an unprecedented intrinsic HER activity under elastic strain. However, such S-vacancies are unstable and the activities are very sensitive to the vacancy concentration. A strategy to stabilize these abundant active sites is thus highly desirable. Herein, we rationally design a catalyst system to stabilize S-vacancies in the basal plane of 2H-MoS2 supported on defective vertical graphene network (VGN). The energetically favorable line-shaped S-vacancies in MoS2 show a consistently high HER activity that is insensitive to S-vacancy concentration. Moreover, the defective graphene support effectively stabilizes these S-vacancies. The optimized catalyst exhibits a superior HER activity with overpotential of 128 mV at 10 mA cm−2 and Tafel slope of 50 mV dec−1. Most importantly, the catalyst shows greatly increased stability over 500 h; benchmarking the most stable nonprecious HER catalyst in acidic media to date. |
| first_indexed | 2024-10-01T07:16:09Z |
| format | Journal Article |
| id | ntu-10356/142143 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:16:09Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1421432023-03-04T17:23:27Z Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution Zhao, Yunxing Tang, Michael T. Wu, Sudong Geng, Jing Han, Zhaojun Chan, Karen Gao, Pingqi Li, Hong School of Electrical and Electronic Engineering School of Mechanical and Aerospace Engineering Centre for Micro-/Nano-electronics (NOVITAS) CINTRA CNRS/NTU/THALES Engineering::Electrical and electronic engineering 2D Heterostructure Hydrogen Evolution Sulfur (S) vacancies in MoS2 have been found to act as a new active center, which shows an unprecedented intrinsic HER activity under elastic strain. However, such S-vacancies are unstable and the activities are very sensitive to the vacancy concentration. A strategy to stabilize these abundant active sites is thus highly desirable. Herein, we rationally design a catalyst system to stabilize S-vacancies in the basal plane of 2H-MoS2 supported on defective vertical graphene network (VGN). The energetically favorable line-shaped S-vacancies in MoS2 show a consistently high HER activity that is insensitive to S-vacancy concentration. Moreover, the defective graphene support effectively stabilizes these S-vacancies. The optimized catalyst exhibits a superior HER activity with overpotential of 128 mV at 10 mA cm−2 and Tafel slope of 50 mV dec−1. Most importantly, the catalyst shows greatly increased stability over 500 h; benchmarking the most stable nonprecious HER catalyst in acidic media to date. Accepted version 2020-06-16T06:43:51Z 2020-06-16T06:43:51Z 2020 Journal Article Zhao, Y., Tang, M. T., Wu, S., Geng, J., Han, Z., Chan, K., . . . Li, H. (2020). Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution. Journal of Catalysis, 382, 320-328. doi:10.1016/j.jcat.2019.12.028 0021-9517 https://hdl.handle.net/10356/142143 10.1016/j.jcat.2019.12.028 2-s2.0-85077925414 382 320 328 en Journal of Catalysis © 2019 Elsevier Inc. All rights reserved. This paper was published in Journal of Catalysis and is made available with permission of Elsevier Inc. application/pdf application/pdf |
| spellingShingle | Engineering::Electrical and electronic engineering 2D Heterostructure Hydrogen Evolution Zhao, Yunxing Tang, Michael T. Wu, Sudong Geng, Jing Han, Zhaojun Chan, Karen Gao, Pingqi Li, Hong Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution |
| title | Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution |
| title_full | Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution |
| title_fullStr | Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution |
| title_full_unstemmed | Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution |
| title_short | Rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution |
| title_sort | rational design of stable sulfur vacancies in molybdenum disulfide for hydrogen evolution |
| topic | Engineering::Electrical and electronic engineering 2D Heterostructure Hydrogen Evolution |
| url | https://hdl.handle.net/10356/142143 |
| work_keys_str_mv | AT zhaoyunxing rationaldesignofstablesulfurvacanciesinmolybdenumdisulfideforhydrogenevolution AT tangmichaelt rationaldesignofstablesulfurvacanciesinmolybdenumdisulfideforhydrogenevolution AT wusudong rationaldesignofstablesulfurvacanciesinmolybdenumdisulfideforhydrogenevolution AT gengjing rationaldesignofstablesulfurvacanciesinmolybdenumdisulfideforhydrogenevolution AT hanzhaojun rationaldesignofstablesulfurvacanciesinmolybdenumdisulfideforhydrogenevolution AT chankaren rationaldesignofstablesulfurvacanciesinmolybdenumdisulfideforhydrogenevolution AT gaopingqi rationaldesignofstablesulfurvacanciesinmolybdenumdisulfideforhydrogenevolution AT lihong rationaldesignofstablesulfurvacanciesinmolybdenumdisulfideforhydrogenevolution |