Journal
ADVANCED MATERIALS
Volume 30, Issue 18, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201706076
Keywords
2D TMD materials; electrochemical microreactors; hydrogen evolution reaction; individual factors; overall performance
Categories
Funding
- DOE [DE-SC0014476]
- NSFDMR [1402600]
- NSFEFMA [1542815]
- Yale Institute for Nanoscience and Quantum Engineering (YINQE)
- Yale West Campus Materials Characterization Core (MCC)
- MRSECDMR [1119826]
- StandUP for energy network and Vatenskapsradet (VR)
- Directorate For Engineering
- Emerging Frontiers & Multidisciplinary Activities [1542815] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1402600] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0014476] Funding Source: U.S. Department of Energy (DOE)
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For the electrochemical hydrogen evolution reaction (HER), the electrical properties of catalysts can play an important role in influencing the overall catalytic activity. This is particularly important for semiconducting HER catalysts such as MoS2, which has been extensively studied over the last decade. Herein, on-chip microreactors on two model catalysts, semiconducting MoS2 and semimetallic WTe2, are employed to extract the effects of individual factors and study their relations with the HER catalytic activity. It is shown that electron injection at the catalyst/current collector interface and intralayer and interlayer charge transport within the catalyst can be more important than thermodynamic energy considerations. For WTe2, the site-dependent activities and the relations of the pure thermodynamics to the overall activity are measured and established, as the microreactors allow precise measurements of the type and area of the catalytic sites. The approach presents opportunities to study electrochemical reactions systematically to help establish rational design principles for future electrocatalysts.
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