期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 29, 页码 24600-24607出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b06231
关键词
graphene dots; transition bimetallic phosphide; oxygen evolution reaction; hydrogen evolution reaction; overall water splitting
资金
- National Science Foundation of China [51472027, 51672034, 21110102036]
- National Basic Research Program of China (973 program) [2014CB239402]
- Swedish Energy Agency
- K & A Wallenberg Foundation
Bifunctional electrocatalysts are highly desired for overall water splitting. Herein, the design and fabrication of three-dimensional (3D) hierarchical earth-abundant transition bimetallic phosphide arrays constructed by one-dimensional tubular array that was derived from assembling two-dimensional nanosheet framework has been reported by tailoring the Co/Ni ratio and tunable morphologies, and zero-dimensional (0D) graphene dots were embedded on Co-Ni phosphide matrix to construct 0D/2D tubular array as a highly efficient electrode in the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). On the basis of advanced merits, such as the high surface-active sites, well-dispersed graphene dots, and enhanced electron transfer capacity as well as the confinement effect of the graphene dots on the nanosheets, the integrated GDs/Co0.8Ni0.2P tubular arrays as anode and cathode exhibit excellent OER and HER performance. By use of GDs/Co0.8Ni0.2 arrays in the two-electrode setup of the device, a remarkable electrocatalytic performance for full water splitting has been achieved with a high current density of 10 mA cm-2 at 1.54 V and outstanding long-term operation stability in an alkaline environment, indicating a promising system based on nonprecious-metal electrocatalysts toward potential practical devices of overall water splitting.
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