REFERENCES

1. Liu, J.; Liu, Y.; Nan, B.; et al. A two-in-one strategy to simultaneously boost the site density and turnover frequency of Fe-N-C oxygen reduction catalysts. Angew. Chem. Int. Ed. 2025, 64, e202425196.

2. Yang, J.; Liu, W.; Xu, M.; et al. Dynamic behavior of single-atom catalysts in electrocatalysis: identification of Cu-N3 as an active site for the oxygen reduction reaction. J. Am. Chem. Soc. 2021, 143, 14530-9.

3. Shang, H.; Zhou, X.; Dong, J.; et al. Engineering unsymmetrically coordinated Cu-S1N3 single atom sites with enhanced oxygen reduction activity. Nat. Commun. 2020, 11, 3049.

4. Zhang, M.; Li, H.; Chen, J.; et al. Transition metal (Co, Ni, Fe, Cu) single-atom catalysts anchored on 3D nitrogen-doped porous carbon nanosheets as efficient oxygen reduction electrocatalysts for Zn-air battery. Small 2022, 18, 2202476.

5. Ji, S.; Wang, Y.; Liu, H.; et al. Regulating the electronic synergy of asymmetric atomic Fe sites with adjacent defects for boosting activity and durability toward oxygen reduction. Adv. Funct. Mater. 2024, 34, 2314621.

6. Wang, Q.; Shang, L.; Sun-Waterhouse, D.; Zhang, T.; Waterhouse, G. Engineering local coordination environments and site densities for high-performance Fe-N-C oxygen reduction reaction electrocatalysis. SmartMat 2021, 2, 154-75.

7. Bai, J.; Guan, X.; Qu, H.; et al. Multiscale structure regulation induced by fluorine coordination enables high-performance and durable PEMFC. ACS. Energy. Lett. 2025, 10, 2743-51.

8. Li, J.; Bao, M.; Pan, J.; et al. Chlorine-nitrogen doped hollow polyhedral carbon-based catalysts for high performance zinc-air batteries. Ind. Eng. Chem. Res. 2024, 63, 19498-505.

9. Shen, H.; Jia, Y.; Qi, Y.; et al. Steering structural mesoporosity and working microenvironment of Fe-N-C catalysts for boosting cathodic mass transport of zinc-air batteries. Sci. China. Chem. 2022, 65, 1670-8.

10. Tang, C.; Jin, R.; Xia, Y.; et al. Asymmetric low-coordination tailoring of single-atom cobalt catalysts enabling efficient oxygen reduction reaction. Nano. Energy. 2025, 137, 110776.

11. Wang, P.; Zhang, R.; Wang, K.; et al. Simultaneously constructing asymmetrically coordinated cobalt single atoms and cobalt nanoclusters via a fresh potassium hydroxide clipping strategy toward efficient alkaline oxygen reduction reaction. Energy. Mater. Adv. 2023, 4, 0042.

12. Kang, Z.; Wang, X.; Wang, D.; et al. Carbon-based single-atom catalysts: impacts of atomic coordination on the oxygen reduction reaction. Nanoscale 2023, 15, 9605-34.

13. Zhang, L.; Meng, Q.; Zheng, R.; et al. Microenvironment regulation of M-N-C single-atom catalysts towards oxygen reduction reaction. Nano. Res. 2023, 16, 4468-87.

14. Bai, J.; Lian, Y.; Deng, Y.; et al. Simultaneous integration of Fe clusters and NiFe dual single atoms in nitrogen-doped carbon for oxygen reduction reaction. Nano. Res. 2023, 17, 2291-7.

15. Wu, M.; Wu, Q.; Yang, Y.; He, Z.; Yang, H. Regulating Lewis acidity and local electron density of iron-based metal organic frameworks via cerium doping for efficient photo-Fenton process. J. Colloid. Interface. Sci. 2023, 630, 866-77.

16. Ma, N.; Duan, L.; Ma, D.; et al. Demonstration of a high-density alkali-metal atomic magnetometer based on the frequency-symmetrical detuning effect of two pumping lights. Opt. Express. 2022, 30, 45930.

17. Wang, Q.; Lu, R.; Yang, Y.; et al. Tailoring the microenvironment in Fe-N-C electrocatalysts for optimal oxygen reduction reaction performance. Sci. Bull. 2022, 67, 1264-73.

18. Xu, Q.; Hu, J.; Yao, H.; et al. Pyridinic-N regulated electron injection to modulate *OH adsorption at Fe-N-C sites for an efficient oxygen reduction reaction. ACS. Appl. Mater. Interfaces. 2024, 16, 42352-62.

19. Lu, X.; Yang, P.; Wan, Y.; et al. Active site engineering toward atomically dispersed M-N-C catalysts for oxygen reduction reaction. Coord. Chem. Rev. 2023, 495, 215400.

20. Yu, Z.; Si, C.; Lagrow, A. P.; et al. Iridium-iron diatomic active sites for efficient bifunctional oxygen electrocatalysis. ACS. Catal. 2022, 12, 9397-409.

21. Gao, H.; Shang, L.; Qian, S.; et al. Precise axial coordination tailors the spin state of single-atom iron for boosted oxygen reduction electrocatalysis. Adv. Funct. Mater. 2026, 36, e31932.

22. Hu, Y.; Niu, S.; Zhang, Z.; et al. Axial chlorine engineering of p-block antimony atomic sites boosts oxygen reduction. J. Am. Chem. Soc. 2025, 147, 21231-40.

23. Liu, M.; Liu, Y.; Zhang, X.; et al. Altering the symmetry of Fe-N-C by axial Cl-mediation for high-performance zinc-air batteries. Angew. Chem. Int. Ed. 2025, 64, e202504923.

24. Yin, L.; Sun, M.; Zhang, S.; Huang, Y.; Huang, B.; Du, Y. Chlorine axial coordination activated lanthanum single atoms for efficient oxygen electroreduction with maximum utilization. Adv. Mater. 2024, 37, 2416387.

25. Li, L.; Huang, S.; Cao, R.; et al. Optimizing microenvironment of asymmetric N,S-coordinated single-atom Fe via axial fifth coordination toward efficient oxygen electroreduction. Small 2021, 18, 2105387.

26. Yu, C.; Xiao, W.; Huang, J.; Hao, C.; Shen, P. K.; Tian, Z. Q. Single yttrium atom coordinated by nitrogen and oxygen with an asymmetric 4d orbit as efficient oxygen reduction electrocatalyst. J. Colloid. Interface. Sci. 2025, 691, 137425.

27. Li, Y.; Zang, K.; Duan, X.; Luo, J.; Chen, D. Boost oxygen reduction reaction performance by tuning the active sites in Fe-N-P-C catalysts. J. Energy. Chem. 2021, 55, 572-9.

28. Wu, L.; Wang, Y.; Shao, C.; Wang, L.; Li, B. Copper single atom-modulated functionalization of iron clusters on a porous carbon nanosheet for the oxygen reduction reaction. J. Mater. Chem. A. 2025, 13, 5974-86.

29. Yang, L.; Xu, H.; Liu, H.; et al. Oxygen-reconstituted active species of single-atom Cu catalysts for oxygen reduction reaction. Research 2020, 2020, 7593023.

30. Bai, J.; Sun, Z.; Zhang, H.; et al. Modulating the local coordination environment of M-Nx single-atom site for enhanced electrocatalytic oxygen reduction. Adv. Funct. Mater. 2024, 35, 2417013.

31. Tong, M.; Wang, L.; Fu, H. Designed synthesis and catalytic mechanisms of non-precious metal single-atom catalysts for oxygen reduction reaction. Small. Methods. 2021, 5, 2100865.

32. Liu, J.; Zhang, W.; Zhang, Y.; et al. Fe, Ni, co-doped ZIF-8 derived in situ grown carbon nanotubes as Zinc-air battery cathode for self-powered electrochemical sensing glucose. J. Alloys. Compd. 2025, 1020, 179475.

33. Zhang, Y.; Li, F.; Li, S.; et al. Asymmetric dual-atomic catalyst with axial chloride coordination for efficient oxygen reduction reaction. Adv. Mater. 2025, 37, 2507478.

34. Peng, J.; Hu, B.; Li, Z.; et al. Regulating atomic Fe/Cu dual sites with unsymmetrical Fe-N6 and Cu-N1S2 coordination for promoting bifunctional oxygen electrocatalysis in advanced zinc-air batteries. Energy. Storage. Mater. 2024, 68, 103342.

35. Cheng, H.; Sun, H.; Dai, M.; et al. Optimizing the ratio of metallic and single-atom Co in CoNC via annealing temperature modulation for enhanced bifunctional oxygen evolution reaction/oxygen reduction reaction activity. Molecules 2024, 29, 5721.

36. Wang, M.; Wang, L.; Li, Q.; et al. Regulating the coordination geometry and oxidation state of single-atom Fe sites for enhanced oxygen reduction electrocatalysis. Small 2023, 19, 2300373.

37. Xie, S.; Jin, H.; Wang, C.; et al. A comparison study on single metal atoms (Fe, Co, Ni) within nitrogen-doped graphene for oxygen electrocatalysis and rechargeable Zn-air batteries. Chin. Chem. Lett. 2023, 34, 107681.

38. Sabhapathy, P.; Raghunath, P.; Sabbah, A.; et al. Axial chlorine induced electron delocalization in atomically dispersed FeN4 electrocatalyst for oxygen reduction reaction with improved hydrogen peroxide tolerance. Small 2023, 19, 2303598.

39. Chen, Y.; Liu, X.; Li, S.; Li, J.; Fan, M.; Shu, S. Crystalline-amorphous heterostructures with built-in electric fields enhance the tandem electroreduction of nitrate to ammonia. Adv. Funct. Mater. 2025, 36, e21409.

40. Li, S.; Huang, J.; Yan, J.; et al. Electronic bridges-stabilized Fe-Cu twin-sites circumvent scaling relationship for robust acidic oxygen reduction. ACS. Catal. 2026, 16, 2124-34.

41. Jia, B.; Xie, X.; Lin, J.; et al. Harnessing pyridinic N vacancy defect in microporous structures to induce the pre-adsorption of oxygen and boost oxygen reduction reaction kinetics. Angew. Chem. Int. Ed. 2025, 64, e202508674.

42. Chen, X.; Hu, H.; Liu, M.; Zhong, X.; Wu, D.; Su, H. Unveiling the spatially dependent cooperative effect in iridium sites for enhanced acidic water oxidation. Nano. Lett. 2025, 25, 15384-92.

43. Liu, M.; Su, H.; Liu, X.; et al. Dynamic modulation of electron redistribution at the heterogeneous interface nickel hydroxides/platinum boosts acidic oxygen reduction reaction. Nat. Commun. 2025, 16, 2826.

44. Wang, M. J.; Ji, R.; Huang, C.; et al. Synergistic strong-weak adsorption coupling in the FeN6-CoN4 dual-site modulates oxygen reduction pathways via oxygen adsorbate evolution-to-dissociation transition. ACS. Catal. 2026, 16, 2800-13.

45. Xu, S.; Zhang, Y.; Peng, Y.; et al. Breaking the scaling relationship for oxygen reductionvia amino-molecule-interface-mediated metallene electrocatalysts. Chem. Sci. 2026, 17, 7590-8.

46. Liu, C.; Cheng, K.; Chen, Q.; et al. Synergy of nickel single-atom and heteroatoms Co-doping in carbon for efficient hydrogen peroxide electrosynthesis. Angew. Chem. Int. Ed. 2025, 65, e21397.

47. Liu, J.; Zhang, Z.; Han, C.; et al. Ligand-modified nickel nitride for natural seawater H2O2 synthesis. Appl. Catal. B. Environ. Energy. 2025, 373, 125362.

48. Liu, Z.; Mo, M.; Xiao, B.; et al. Asymmetric coordination modulation on Co single-atom sites tunes selectivity of acidic oxygen reduction. Appl. Catal. B. Environ. Energy. 2025, 377, 125510.

49. Xia, H.; Sun, M.; Yang, D.; et al. Phosphorus/Sulfur-modulated p-band center of pentagonal carbon for efficient oxygen reduction reaction. J. Am. Chem. Soc. 2025, 147, 41472-80.

50. Xia, P.; He, T.; Sun, Y.; et al. Defective-engineered ZnO encapsulated in N-doped carbon for sustainable 2e- ORR: interfacial Zn-N bond regulated oxygen reduction pathways. ACS. Catal. 2024, 14, 12917-27.

51. Wang, Y.; Zheng, M.; Li, Y.; et al. p-d orbital hybridization induced by a monodispersed Ga site on a Pt3Mn nanocatalyst boosts ethanol electrooxidation. Angew. Chem. Int. Ed. 2022, 61, e202115735.

52. Wang, J.; Liu, W.; Luo, G.; et al. Synergistic effect of well-defined dual sites boosting the oxygen reduction reaction. Energy. Environ. Sci. 2018, 11, 3375-9.

53. Liao, Y.; Xiao, Y.; Li, Z.; et al. Structural engineering of Co-metal-organic frameworks via Ce incorporation for improved oxygen evolution. Small 2023, 20, 2307685.

54. Song, L.; Liu, Y.; Wang, J.; et al. Hierarchically porous two-dimensional Fe/N-codoped carbon nanoleaves for enhanced mass transfer and electrocatalytic oxygen reduction reaction. Energy. Mater. 2025, 5, 500139.

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