Spherical Ruthenium Disulfide-Sulfur-Doped Graphene Composite as an Efficient Hydrogen Evolution Electrocatalyst
Open accessAbstract
The exploition of cost-efficient and high-performance catalysts to boost hydrogen generation in overall water splitting is crucial to economically obtain green hydrogen energy. Herein, we propose a novel electrocatalyst consisting of spherical RuS 2 on S-doped reduced graphene oxide (s-RuS 2 /S-rGO) with high catalytic behavior toward hydrogen evolution reaction (HER) in all pH conditions, especially in alkaline electrolytes. RuS 2 /S-rGO delivers small overpotentials of 25 and 56 mV at current densities of 10 and 50 mA cm –2, respectively, and a low Tafel slope of 29 mV dec –1 with good stability for 100 h in basic solutions. This performance is comparable to and even exceeds that of documented representative electrocatalysts, including the benchmark Pt/C; since the price of Ru is about 1/25th that of Pt, this novel electrocatalyst offers a low-cost alternative to Pt-based HER electrocatalysts. Ruthenium-centered sites of RuS 2 in this hybrid catalyst are responsible for the HER active sites, and S doping in RuS 2 also exerts an important function for the HER activity; density functional theory calculations disclose that the water dissociation ability and adsorption free energy of hydrogen intermediate adsorption (Δ G H* ) for RuS 2 are very close to those of Pt. A homemade electrolyzer with an s-RuS 2 /S-rGO (cathode)//RuO 2 /C (anode) couple presents a relatively low voltage of 1.54 V at a current density of 20 mA cm –2, while maintaining negligible deactivation over a 24 h operation.
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- Authors
- Yu, J., Guo, Y., Miao, S., Ni, M., Zhou, W., & Shao, Z.
- Affiliations
- Nanjing Tech University (CN)
- Hong Kong Polytechnic University (HK)
- Corresponding author
- Zhou, Wei
- Shao, Zongping
- Venue
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-09-11
- Volume
- 10
- Issue
- 40
- Pages
- 34098-34107
- ISSN
- 1944-8244 (ISSN-L)
- 1944-8252
- OpenAlex
- W2890279954
- Cited by
- 104
- References
- 59
- Citations by year
- 2026: 7 · 2025: 9 · 2024: 19 · 2023: 10 · 2022: 23 · 2021: 13 · 2020: 15 · 2019: 8
- FWCI
- 2.08
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Locations
- ACS Applied Materials & Interfaces (publishedVersion)
- PubMed (publishedVersion)
- PolyU Institutional Research Archive (Hong Kong Polytechnic University) (submittedVersion)
- eSpace (Curtin University) (submittedVersion)
- Funders
- Natural Science Foundation of Jiangsu Province (BK20170043, BK20150945)
- National Natural Science Foundation of China (21576135)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
- Keywords
- hydrogen evolution reaction, electrocatalysts, overall water splitting, green hydrogen, alkaline water electrolysis, hydrogen adsorption free energy, water dissociation, electrolyzer, catalyst stability
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