期刊
CHEMICAL ENGINEERING JOURNAL
卷 440, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135928
关键词
Single metal atom; Dual coordination; Synergistic effect; Oxygen reduction reaction; Zinc-air battery
资金
- National Natural Science Fund [52003163]
- Natural Science Fund of Guangdong Province [20212018]
- Science and Technology Innovation Commission hen [KQTD20170810105439418, 20200812112006001]
- Shenzhen University-Taipei University of Science and Technology Collaboration Project [2021006, NTUT-SZU-110-06]
- Taiwans Ministry of Science and Technology [MOST 2113-M-027-011]
- China post-doctoral Foundation
- [2020 M672790]
Single-atom catalysts with a ZnN3P configuration were synthesized and used as catalysts. The ZnCo-PNC catalyst showed excellent performance for oxygen reduction reaction in alkaline medium and demonstrated respectable performance for zinc-air battery applications.
Single-atom catalysts have emerged as effective active species for electrocatalysis because of their appropriate structural and electronic properties. However, the weight percentage of single metal atoms are generally below 5 wt% in the catalysts, limiting the population of catalytic sites and their performance. In this work, we synthesized Zn single atoms with a configuration of ZnN3P in the carbon framework. With the Co2P particles as supports (ZnCo-PNC), the generic Zn single atom catalysts with a content of only 2 wt% showed a half-wave potential of 0.91 V for oxygen reduction reaction in alkaline medium. This value is higher than that for pure P doped Zn and Co based catalysts (Zn-PNC of 0.69 V, Co-PNC of 0.82 V), and even better than commercial Pt/C (0.87 V). DFT results demonstrated that the synergistic promotion of Co2P supports and N/P coordination could reduce the energy barrier to proceed ORR on Zn single atoms from 1.85 to 0.79 eV. By using it as the cathode catalyst for zinc-air battery application, it shows respectable performance in terms of maximum peak power (237.3 mW cm(-2)) and energy densities (847 W h kg(-1)). The current strategy may open new horizons to design high performance single atom catalysts by using suitable supports and coordination environment to tune their activity.
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