期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 125, 期 45, 页码 24814-24822出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c08140
关键词
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资金
- National Key Research and Development Plan [2020YFB1506001]
- National Natural Science Foundation of China [21633008, 21575134, 21773224]
- K. C. Wong Education Foundation
Bismuth titanate (Bi4Ti3O12) nanosheets as a new type of electrocatalyst show high catalytic activity and selectivity for H2O2 generation from 2e(-1)ORR. Nd-substituted Bi4Ti3O12 nanosheets exhibit even higher selectivity for O-2 to H2O2 conversion, achieving efficient H2O2 production under mild conditions. The excellent catalytic performance is attributed to the large surface area and abundant exposed active sites of the nanosheets.
The electrochemical two-electron oxygen reduction reaction (2e(-1)ORR) is a promising route for renewable H2O2 generation as an alternative method to the anthraquinone process. The development of efficient and highly selective catalytic materials is a highly meaningful and challenging subject due to the strong competition from the traditional four electron oxygen reduction reaction (4e(-)1ORR). Here, we synthesized bismuth titanate (Bi4Ti3O12) nanosheets as a type of new electrocatalyst for H2O2 generation from 2e(-1)ORR. The structure of the Bi4Ti3O12 nanosheets is characterized by high-resolution transmission electron microscopy (HRTEM) and X-ray techniques. The electrochemical measurements show that the obtained bismuth titanate (Bi4Ti3O12), especially the neodymium (Nd)-substituted Bi4Ti3O12, has high catalytic activity and selectivity for O-2 to H2O2. For the ORR catalyzed by Bi4Ti3O12 nanosheets, 83-89% H2O2 selectivity can be achieved in a wide range of potentials, while Nd-substituted Bi4Ti3O12 nanosheets afford a higher selectivity of 93-95%. Moreover, in a two chamber H-cell, H2O2 production of 208 mol kgcat(-1) can be achieved at 0.36 V under the catalysis of Nd-substituted Bi4Ti3O12 for 1 h with a Faraday efficiency of 97.6%. The high O(2)(-)to-H2O2 catalytic performance could be ascribed to the large surface area and the abundant exposed active sites of the nanosheets.
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