过电位
材料科学
析氧
氧气
纳米结构
空位缺陷
催化作用
金属
电子
化学工程
纳米技术
化学物理
电极
物理化学
电化学
结晶学
化学
冶金
量子力学
物理
有机化学
工程类
生物化学
作者
Ying Liu,Chao Ma,Qinghua Zhang,Wei Wang,Pengfei Pan,Lin Gu,Dongdong Xu,Jianchun Bao,Zhihui Dai
标识
DOI:10.1002/adma.201900062
摘要
The rational design of atomic-scale interfaces in multiphase nanohybrids is an alluring and challenging approach to develop advanced electrocatalysts. Herein, through the selection of two different metal oxides with particular intrinsic features, advanced Co3 O4 /CeO2 nanohybrids (NHs) with CeO2 nanocubes anchored on Co3 O4 nanosheets are developed, which show not only high oxygen vacancy concentration but also remarkable 2D electron gas (2DEG) behavior with ≈0.79 ± 0.1 excess e- /u.c. on the Ce3+ sites at the Co3 O4 -CeO2 interface. Such a 2DEG transport channel leads to a high carrier density of 3.8 × 1014 cm-2 and good conductivity. Consequently, the Co3 O4 /CeO2 NHs demonstrate dramatically enhanced oxygen evolution reaction (OER) performances with a low overpotential of 270 mV at 10 mA cm-2 and a high turnover frequency of 0.25 s-1 when compared to those of pure Co3 O4 and CeO2 counterparts, outperforming commercial IrO2 and some recently reported representative OER catalysts. These results demonstrate the validity of tailoring the electrocatalytic properties of metal oxides by 2DEG engineering, offering a step forward in the design of advanced hybrid nanostructures.
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