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

Sangwook Park; Joonsuk Park; Hadi Abroshan; Liang Zhang; Jung Kyu Kim; Jiaming Zhang; Jinghua Guo; Samira Siahrostami; Xiaolin Zheng;
Stanford University; Stanford University; Stanford University; Lawrence Berkeley National Laboratory; Sungkyunkwan University;Hewlett-Packard Laboratories, 1501 Page Mill Road; Lawrence Berkeley National Laboratory; Stanford University; Stanford University
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Abstract AITranslate

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.

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DOI：https://doi.org/10.1021/acsenergylett.8b01567

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Citation Information:

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.

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GB/T 7714-2015 [1] Sangwook Park, Joonsuk Park, Hadi Abroshan, et al. ACS Energy Letters, 2018(3). DOI:10.1021/acsenergylett.8b01567.
MLA [1] Sangwook Park, et al., ACS Energy Letters, no. 3, 2018, https://doi.org/10.1021/acsenergylett.8b01567.
APA [1] Sangwook Park, Joonsuk Park, Hadi Abroshan, Liang Zhang, Jung Kyu Kim, Jiaming Zhang, Jinghua Guo, Samira Siahrostami, & Xiaolin Zheng. (2018). ACS Energy Letters(3). https://doi.org/10.1021/acsenergylett.8b01567
IEEE [1] Sangwook Park, Joonsuk Park, Hadi Abroshan, Liang Zhang, Jung Kyu Kim, Jiaming Zhang, Jinghua Guo, Samira Siahrostami, and Xiaolin Zheng, ACS Energy Letters, no. 3, 2018, doi: 10.1021/acsenergylett.8b01567.