Journal
NANO ENERGY
Volume 60, Issue -, Pages 827-835Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2019.04.037
Keywords
Artificial photosynthesis; Ethanol; Type-II heterojunction; Photoelectrochemical CO2 reduction
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Funding
- NSFC Major International (Regional) Joint Research Project NSFC-SNSF [51661135023]
- National Natural Science Foundation of China [21673091]
- Fundamental Research Funds for the Central Universities [HUST: 2016YXMS031]
- Director Fund of the WNLO
- Open Funds of the State Key Laboratory of Electroanalytical Chemistry [SKLEAC201607]
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Constructing heterojunctions and designing advanced structures to mimic natural photosynthesis is an effective route to convert CO2 into high-energy chemicals with high efficiency and selectivity. Compared to a single-component catalyst, those of two components with different function can corporately facilitate the formation of C-2 products. Herein, a type-II heterojunction based on graphitic carbon nitride (g-C3N4)/ZnTe was constructed for the first time for photoelectrochemical CO2 reduction, yielding an impressive ethanol generation rate of 17.1 mu mol cm(-2)h(-1) at -1.1 V (vs. Ag/AgCl). The heterojunction accelerates separation of photo-generated electron-hole pairs and transfer of electrons from ZnTe to g-C3N4 driving by an interfacial internal electric field (IEF) formed between the two semiconductors. Moreover, the combination of ZnTe of high CO2 adsorption capacity serves as CO-producing site with g-C3N4 featuring of abundant pyridinic N subsequently accomplishes the C-C coupling process via adsorbing CO and proton-coupled electron transfer. A pipelined mechanism to rationalize the selective reduction of CO(2 )to ethanol is proposed and discussed.
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