期刊
NANO ENERGY
卷 47, 期 -, 页码 96-104出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.02.032
关键词
Water-splitting; OER; HER; Electrodeposition; N-CNT
类别
资金
- Science Challenge Project [TZ2018004]
- National Natural Science Foundation of China [51572016, U1530401]
- National Program for Thousand Young Talents of China
- NSFC-Guangdong Joint Fund [U1501501]
Electrocatalysts with low overpotential and high stability are highly demanded in water-splitting system. The efficiency of water-splitting is largely restricted by the oxygen evolution reaction (OER). Here, we developed a two-step method to prepare 3D porous material through chemical vapor deposition and electrodeposition combined with the first-principles calculations. Ultrathin alpha-Co(OH) (2) nanosheets grown on the combined substrate of N-doped carbon nanotubes (NCNTs) and nickel foam were fabricated to investigate their electro-chemical behaviour. Because of the characteristics of the ultrathin, microporous alpha-Co(OH)(2) and its derivatives, the 3D Co(OH)(2)@NCNTs@NF exhibits outstanding performance as a bifunctional catalyst for water-splitting. The overpotentials to achieve 10 mA cm(-2) current density in 1 M KOH for OER and hydrogen evolution reaction (HER) are 270 mV and 170 mV, respectively. The as-prepared material exhibits superior stability, which generate 10 mA cm(-2) current density in overall water-splitting over 600 h without obvious degradation in 1 M KOH at voltage of 1.72 V vs. RHE. The first-principles calculations reveal that the N-doping not only can effectively enhance the interaction between the substrate and active material (CoOOH), but also modulate the electronic structure of CoOOH to speed up the O-2 releasing during the OER.
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