Journal
NATURE MATERIALS
Volume 15, Issue 9, Pages 1003-1009Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4660
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Funding
- NSF [DGE 0903661, ECCS 1128335, CAREER CHE-1004218, DMR-0968937, NanoEHS-1134289, 0959905]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-Brazil
- Rutgers Energy Institute
- LDRD program at LANL
- US DOE, Office of Science, BES Award [DE-SC0005132]
- US National Science Foundation [EFMA-542879, CMMI-1363203, CBET-1235870]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1235870] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1363203] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0959905] Funding Source: National Science Foundation
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [GRANTS:13918119, 1542879] Funding Source: National Science Foundation
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The excellent catalytic activity of metallic MoS2 edges for the hydrogen evolution reaction (HER) has led to substantial efforts towards increasing the edge concentration. The 2H basal plane is less active for the HER because it is less conducting and therefore possesses less efficient charge transfer kinetics. Here we show that the activity of the 2H basal planes of monolayer MoS2 nanosheets can be made comparable to state-of-the-art catalytic properties of metallic edges and the 1T phase by improving the electrical coupling between the substrate and the catalyst so that electron injection from the electrode and transport to the catalyst active site is facilitated. Phase-engineered low-resistance contacts on monolayer 2H-phase MoS2 basal plane lead to higher efficiency of charge injection in the nanosheets so that its intrinsic activity towards the HER can be measured. We demonstrate that onset potentials and Tafel slopes of similar to-0.1 V and similar to 50 mV per decade can be achieved from 2H-phase catalysts where only the basal plane is exposed. We show that efficient charge injection and the presence of naturally occurring sulfur vacancies are responsible for the observed increase in catalytic activity of the 2H basal plane. Our results provide new insights into the role of contact resistance and charge transport on the performance of two-dimensional MoS2 nanosheet catalysts for the HER.
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