Highly efficient and stable hydrogen production in all pH range by two-dimensional structured metal-doped tungsten semicarbides

Transition-metal-doped tungsten semicarbide nanosheets (M-doped W2C NSs, M=Fe, Co, and Ni) have been synthesized through carburization of the mixture of tungsten trioxide, polyvinylpyrrolidone, and metal dopant. The nanosheets grow directly on the W mesh and have the lateral dimension of several hun...

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Main Authors: Ang, Edison Huixiang, Dinh, Khang Ngoc, Sun, Xiaoli, Huang, Ying, Yang, Jun, Dong, Zhili, Dong, Xiaochen, Huang, Wei, Wang, Zhiguo, Zhang, Hua, Yan, Qingyu
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/138665
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1386652023-07-14T15:59:37Z Highly efficient and stable hydrogen production in all pH range by two-dimensional structured metal-doped tungsten semicarbides Ang, Edison Huixiang Dinh, Khang Ngoc Sun, Xiaoli Huang, Ying Yang, Jun Dong, Zhili Dong, Xiaochen Huang, Wei Wang, Zhiguo Zhang, Hua Yan, Qingyu School of Materials Science & Engineering Interdisciplinary Graduate School (IGS) Centre for Programmable Materials Energy Research Institute @ NTU (ERI@N) Science::Chemistry Electrocatalysts HER Catalysts Transition-metal-doped tungsten semicarbide nanosheets (M-doped W2C NSs, M=Fe, Co, and Ni) have been synthesized through carburization of the mixture of tungsten trioxide, polyvinylpyrrolidone, and metal dopant. The nanosheets grow directly on the W mesh and have the lateral dimension of several hundreds of nm to a few μm with a thickness of few tens nm. It is demonstrated that the M-doped W2C NSs exhibit superior electrocatalytic activity for hydrogen evolution reaction (HER). Impressively, the Ni-doped W2C NSs (2 at Ni) with the optimized HER activity show extremely low onset overpotentials of 4, 9, and 19 mV and modest Tafel slopes of 39, 51, and 87 mV dec−1 in acidic (pH=0), neutral (pH=7.2), and basic (pH=14) solutions, respectively, which is close to the commercial Pt/C catalyst. Density functional theory (DFT) calculations also demonstrate that the Gibbs free energy for H adsorption of Ni-W2C is much closer to the optimal value = -0.073 eV as compared to -0.16 eV of W2C. Furthermore, nearly 100% Faradaic efficiency and long-term stability are obtained in those environments. This realization of highly tolerant metal semicarbide catalyst performing on par with commercial Pt/C in all range of pH offers a key step towards industrially electrochemical water splitting. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2020-05-11T08:09:05Z 2020-05-11T08:09:05Z 2019 Journal Article Ang, E. H., Dinh, K. N., Sun, X., Huang, Y., Yang, J., Dong, Z., . . . Yan, Q. (2019). Highly efficient and stable hydrogen production in all pH range by two-dimensional structured metal-doped tungsten semicarbides. Research, 2019, 4029516-. doi:10.34133/2019/4029516 2639-5274 https://hdl.handle.net/10356/138665 10.34133/2019/4029516 31549061 2-s2.0-85071848936 2019 en Research © 2019 Edison H. Ang et al. Exclusive Licensee Science and Technology Review Publishing House. Distributed under a Creative Commons Attribution License (CC BY 4.0). application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Chemistry
Electrocatalysts
HER Catalysts
spellingShingle Science::Chemistry
Electrocatalysts
HER Catalysts
Ang, Edison Huixiang
Dinh, Khang Ngoc
Sun, Xiaoli
Huang, Ying
Yang, Jun
Dong, Zhili
Dong, Xiaochen
Huang, Wei
Wang, Zhiguo
Zhang, Hua
Yan, Qingyu
Highly efficient and stable hydrogen production in all pH range by two-dimensional structured metal-doped tungsten semicarbides
description Transition-metal-doped tungsten semicarbide nanosheets (M-doped W2C NSs, M=Fe, Co, and Ni) have been synthesized through carburization of the mixture of tungsten trioxide, polyvinylpyrrolidone, and metal dopant. The nanosheets grow directly on the W mesh and have the lateral dimension of several hundreds of nm to a few μm with a thickness of few tens nm. It is demonstrated that the M-doped W2C NSs exhibit superior electrocatalytic activity for hydrogen evolution reaction (HER). Impressively, the Ni-doped W2C NSs (2 at Ni) with the optimized HER activity show extremely low onset overpotentials of 4, 9, and 19 mV and modest Tafel slopes of 39, 51, and 87 mV dec−1 in acidic (pH=0), neutral (pH=7.2), and basic (pH=14) solutions, respectively, which is close to the commercial Pt/C catalyst. Density functional theory (DFT) calculations also demonstrate that the Gibbs free energy for H adsorption of Ni-W2C is much closer to the optimal value = -0.073 eV as compared to -0.16 eV of W2C. Furthermore, nearly 100% Faradaic efficiency and long-term stability are obtained in those environments. This realization of highly tolerant metal semicarbide catalyst performing on par with commercial Pt/C in all range of pH offers a key step towards industrially electrochemical water splitting.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Ang, Edison Huixiang
Dinh, Khang Ngoc
Sun, Xiaoli
Huang, Ying
Yang, Jun
Dong, Zhili
Dong, Xiaochen
Huang, Wei
Wang, Zhiguo
Zhang, Hua
Yan, Qingyu
format Article
author Ang, Edison Huixiang
Dinh, Khang Ngoc
Sun, Xiaoli
Huang, Ying
Yang, Jun
Dong, Zhili
Dong, Xiaochen
Huang, Wei
Wang, Zhiguo
Zhang, Hua
Yan, Qingyu
author_sort Ang, Edison Huixiang
title Highly efficient and stable hydrogen production in all pH range by two-dimensional structured metal-doped tungsten semicarbides
title_short Highly efficient and stable hydrogen production in all pH range by two-dimensional structured metal-doped tungsten semicarbides
title_full Highly efficient and stable hydrogen production in all pH range by two-dimensional structured metal-doped tungsten semicarbides
title_fullStr Highly efficient and stable hydrogen production in all pH range by two-dimensional structured metal-doped tungsten semicarbides
title_full_unstemmed Highly efficient and stable hydrogen production in all pH range by two-dimensional structured metal-doped tungsten semicarbides
title_sort highly efficient and stable hydrogen production in all ph range by two-dimensional structured metal-doped tungsten semicarbides
publishDate 2020
url https://hdl.handle.net/10356/138665
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