Ternary Porous Cobalt Phosphoselenide Nanosheets: An Efficient Electrocatalyst for Electrocatalytic and Photoelectrochemical Water Splitting
Hou Y, Qiu M, Zhang T, Zhuang X, Kim CS, Yuan C, Feng X (2017)
Publication Type: Journal article
Publication year: 2017
Journal
Book Volume: 29
Article Number: 1701589
Journal Issue: 35
Abstract
Exploring efficient and earth-abundant electrocatalysts is of great importance for electrocatalytic and photoelectrochemical hydrogen production. This study demonstrates a novel ternary electrocatalyst of porous cobalt phosphoselenide nanosheets prepared by a combined hydrogenation and phosphation strategy. Benefiting from the enhanced electric conductivity and large surface area, the ternary nanosheets supported on electrochemically exfoliated graphene electrodes exhibit excellent catalytic activity and durability toward hydrogen evolution in alkali, achieving current densities of 10 and 20 mA cm−2 at overpotentials of 150 and 180 mV, respectively, outperforming those reported for transition metal dichalcogenides and first-row transition metal pyrites catalysts. Theoretical calculations reveal that the synergistic effects of Se vacancies and subsequent P displacements of Se atoms around the vacancies in the resulting cobalt phosphoselenide favorably change the electronic structure of cobalt selenide, assuring a rapid charge transfer and optimal energy barrier of hydrogen desorption, and thus promoting the proton kinetics. The overall-water-splitting with 10 mA cm−2 at a low voltage of 1.64 V is achieved using the ternary electrode as both the anode and cathode, and the performance surpasses that of the Ir/C–Pt/C couple for sufficiently high overpotentials. Moreover, the integration of ternary nanosheets with macroporous silicon enables highly efficient solar-driven photoelectrochemical hydrogen production.
Involved external institutions
Technische Universität Dresden
Germany (DE)
University of Wisconsin - Madison
United States (USA) (US)
Case Western Reserve University
United States (USA) (US)
Central China Normal University (CCNU) / Huazhong Normal University / 华中师范大学
China (CN)
Germany (DE)
University of Wisconsin - Madison
United States (USA) (US)
Case Western Reserve University
United States (USA) (US)
Central China Normal University (CCNU) / Huazhong Normal University / 华中师范大学
China (CN)
How to cite
APA:
Hou, Y., Qiu, M., Zhang, T., Zhuang, X., Kim, C.-S., Yuan, C., & Feng, X. (2017). Ternary Porous Cobalt Phosphoselenide Nanosheets: An Efficient Electrocatalyst for Electrocatalytic and Photoelectrochemical Water Splitting. Advanced Materials, 29(35). https://doi.org/10.1002/adma.201701589
MLA:
Hou, Yang, et al. "Ternary Porous Cobalt Phosphoselenide Nanosheets: An Efficient Electrocatalyst for Electrocatalytic and Photoelectrochemical Water Splitting." Advanced Materials 29.35 (2017).
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