Journal
JOURNAL OF POWER SOURCES
Volume 425, Issue -, Pages 138-146Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.04.014
Keywords
Bifunctional electrocatalyst; Interface; Water splitting; Selenides; Layered double hydroxides
Funding
- National Key R&D Program of China [2017YFE0120500]
- National Natural Science Foundation of China [51502099]
- Fundamental Research Funds for the Central Universities [HUST 2018KFYYXJJ051]
- University of Macau [SRG2016-00092-IAPME, MYRG2018-00079-IAPME]
- Science and Technology, Development Fund Macao S.A.R (FDCT) [081/2017/A2, 0059/2018/A2, 009/2017/AMJ]
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Exploitation of earth-abundant, cost-effective and high-efficient bifunctional electrocatalysts for overall water spitting in basic media is highly desirable, yet it remains a big challenge. Here, NiFe Layered-double-hydroxide nanosheet-anchored CoSe nanotubes (composed of plicated nanosheets) supported on Ni foam are prepared through our developed hydrothermal-selenization-hydrothermal method. Benefiting from the unique nanoarchitecture, optimized adsorption/desorption of oxygenated species at the interface (owing to the re-delocalization of electron spin status via n-donation), the bifunctional hybrid catalysts exhibit low overpotentials of 201 and 98 mV at 10 mA cm(-2) for oxygen evolution reaction and hydrogen evolution reaction in 1 M KOH aqueous solution, respectively. Particularly, the full-cell only requires 1.53 V to drive a current density of 10 mA cm(-2) when choosing the hybrid catalysts serving as both anode and cathode, being superior than that of the state-of-the-art commercial noble-metal based cells for overall water splitting. This work presents a general strategy to boost the oxygen evolution reaction and hydrogen evolution reaction kinetics of selenides, which is also expected to extend to other noble-metal-free catalysts.
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