journal article·2018-11-09Open access

Enhancing Catalytic Activity of MoS2 Basal Plane S-Vacancy by Co Cluster Addition

Sangwook Park, Joonsuk Park, Hadi Abroshan, Liang Zhang, Jung Kyu Kim, Jiaming Zhang, Jinghua Guo, Samira Siahrostami, Xiaolin Zheng

ACS Energy Letters· Volume 3· Issue 11

Abstract

The basal plane of molybdenum disulfide (MoS2) was recently activated for hydrogen evolution reaction (HER) by creating sulfur (S) vacancies (MoS2–x). However, the HER activity of those S-vacancies depends on the concentration of S-vacancies, imposing a dilemma for either improving activity per site or increasing overall active site density. Herein, we use density functional theory (DFT) calculations and experiments to show that the HER activities of MoS2–x are greatly enhanced by adding cobalt (Co) clusters on the basal plane. Our DFT results show that the highest HER activity is achieved when the Co clusters are anchored on the S-vacancies with the interface of Co–Mo as the preferred active site. Our experiments confirm that the addition of Co enhances the activity per unit active site and increases the electrochemical active surface area. These results demonstrate the basal plane activity of MoS2–x can be enhanced by decorating S-vacancies with transition-metal clusters.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · MXene and MAX Phase Materials · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Mechanical Engineering, Stanford University, 440 Escondido Mall, Stanford, California 94305, United States

Department of Material Science & Engineering, Stanford University, 440 Escondido Mall, Stanford, California 94305, United States

SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, 443 Via Ortega, Stanford, California 94305, United States

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

School of Chemical Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea

Hewlett-Packard Laboratories, 1501 Page Mill Road, Palo Alto, California 94304, United States

Funding

Samsung · Stanford University · Stanford Precourt Institute of Energy

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