Okra-like hollow Cu0.15-CoP/Co3O4@CC nanotube arrays catalyst for overall water splitting |
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Affiliation: | 1. School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, PR China;2. Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, PR China;3. Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang 441053, PR China |
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Abstract: | The manufacture of hydrogen energy by overall water splitting (OWS) has been broadly considered as a promising candidate for constant energy systems. Herein, we report an okra-like hollow Cu0.15-CoP/Co3O4@CC nanotube arrays catalyst through a simple hydrothermal-phosphating method. As a noble-metal-free catalyst, it exhibits outstanding HER (hydrogen evolution reaction) catalytic activity with an overpotential of 13 mV to achieve 10 mA cm?2 in 1 M KOH electrolyte. For OER (oxygen evolution reaction), it demands 225 mV to achieve 10 mA cm?2. When okra-like hollow Cu0.15-CoP/Co3O4@CC is used as both cathode and anode electrode materials, 1.487 V is required to reach 10 mA cm?2 for OWS, better than numerous electrocatalysts that have been reported. Moreover, it displays excellent stability in a continuously 60 h i-t test, proving an enormous potential for large-scale applications. The theoretical calculation of density functional theory (DFT) further reveals that Cu doping can bring localized structure polarization and reduce the hydrogen adsorption free energy (ΔGH1) on the interstitial sites, thus leading to a significant increase in catalytic activity. |
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Keywords: | HER OER OWS Density functional theory |
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