[1] [1] TELLEZ-CRUZ M M, ESCORIHUELA J, SOLORZA-FERIA O, et al. Proton exchange membrane fuel cells (PEMFCs): advances and challenges［J］. Polymers, 2021, 13(18): 3064.

[2] [2] BORUP R L, KUSOGLU A, NEYERLIN K C, et al. Recent developments in catalyst-related PEM fuel cell durability［J］. Current Opinion in Electrochemistry, 2020, 21: 192-200.

[3] [3] XU H, WANG D, YANG P X, et al. Atomically dispersed M-N-C catalysts for the oxygen reduction reaction［J］. Journal of Materials Chemistry A, 2020, 8(44): 23187-23201.

[4] [4] XIA D S, TANG X, DAI S, et al. Ultrastable Fe-N-C fuel cell electrocatalysts by eliminating non-coordinating nitrogen and regulating coordination structures at high temperatures［J］. Advanced Materials, 2023, 35(5): e2204474.

[5] [5] LIU S W, LI C Z, ZACHMAN M J, et al. Atomically dispersed iron sites with a nitrogen-carbon coating as highly active and durable oxygen reduction catalysts for fuel cells［J］. Nature Energy, 2022, 7(7): 652-663.

[6] [6] WANG W, JIA Q Y, MUKERJEE S, et al. Recent insights into the oxygen-reduction electrocatalysis of Fe/N/C materials［J］. ACS Catalysis, 2019, 9(11): 10126-10141.

[8] [8] BEZERRA C W B, ZHANG L, LEE K C, et al. A review of Fe-N/C and Co-N/C catalysts for the oxygen reduction reaction［J］. Electrochimica Acta, 2008, 53(15): 4937-4951.

[9] [9] GAO J J, HU Y X, WANG Y, et al. MOF structure engineering to synthesize Co-N-C catalyst with richer accessible active sites for enhanced oxygen reduction［J］. Small, 2021, 17(49): e2104684.

[10] [10] LIU W, ZHANG C, ZHANG J J, et al. Tuning the atomic configuration of Co-N-C electrocatalyst enables highly-selective H2O2 production in acidic media［J］. Applied Catalysis B: Environmental, 2022, 310: 121312.

[11] [11] WANG H F, CHEN L Y, PANG H, et al. MOF-derived electrocatalysts for oxygen reduction, oxygen evolution and hydrogen evolution reactions［J］. Chemical Society Reviews, 2020, 49(5): 1414-1448.

[13] [13] LIANG L H, JIN H H, ZHOU H, et al. Cobalt single atom site isolated Pt nanoparticles for efficient ORR and HER in acid media［J］. Nano Energy, 2021, 88: 106221.

[14] [14] GUO P, LIU B, DAI Y K, et al. Coupling fine Pt nanoparticles and Co-Nx moiety as a synergistic bi-active site catalyst for oxygen reduction reaction in acid media［J］. Journal of Colloid and Interface Science, 2022, 613: 276-284.

[15] [15] HE Y H, HWANG S, CULLEN D A, et al. Highly active atomically dispersed CoN4 fuel cell cathode catalysts derived from surfactant-assisted MOFs: carbon-shell confinement strategy［J］. Energy & Environmental Science, 2019, 12(1): 250-260.

[16] [16] LIANG Z Z, ZHANG C C, YUAN H T, et al. PVP-assisted transformation of a metal-organic framework into Co-embedded N-enriched meso/microporous carbon materials as bifunctional electrocatalysts［J］. Chemical Communications, 2018, 54(54): 7519-7522.

[17] [17] ZENG J H, LEE J Y, ZHOU W J. Activities of Pt/C catalysts prepared by low temperature chemical reduction methods［J］. Applied Catalysis A: General, 2006, 308: 99-104.

[18] [18] HU Z W, ZHANG Z P, LI Z L, et al. One-step conversion from core-shell metal-organic framework materials to cobalt and nitrogen codoped carbon nanopolyhedra with hierarchically porous structure for highly efficient oxygen reduction［J］. ACS Applied Materials & Interfaces, 2017, 9(19): 16109-16116.

[19] [19] SALIBA D, AMMAR M, RAMMAL M, et al. Crystal growth of ZIF-8, ZIF-67, and their mixed-metal derivatives［J］. Journal of the American Chemical Society, 2018, 140(5): 1812-1823.

[21] [21] HERNNDEZ-FERRER J, GRACIA-MARTN M, BENITO A M, et al. Effect of temperature and presence of minor amount of metal on porous carbon materials derived from ZIF8 pyrolysis for electrocatalysis［J］. Catalysis Today, 2023.https://doi.org/10.1016/j.cattod.2022.12.024.

[22] [22] WANG Z L, KE X X, ZHOU K L, et al. Engineering the structure of ZIF-derived catalysts by revealing the critical role of temperature for enhanced oxygen reduction reaction［J］. Journal of Materials Chemistry A, 2021, 9(34): 18515-18525.

[23] [23] ZHU Z J, CHEN C M, CAI M Q, et al. Porous Co-N-C ORR catalysts of high performance synthesized with ZIF-67 templates［J］. Materials Research Bulletin, 2019, 114: 161-169.

[24] [24] LIU Z F, YE D D, ZHU X, et al. ZIF-67-derived Co nanoparticles embedded in N-doped porous carbon composite interconnected by MWCNTs as highly efficient ORR electrocatalysts for a flexible direct formate fuel cell［J］. Chemical Engineering Journal, 2022, 432: 134192.

[25] [25] CUI T T, WANG Y P, YE T, et al. Engineering dual single-atom sites on 2D ultrathin N-doped carbon nanosheets attaining ultra-low-temperature zinc-air battery［J］. Angewandte Chemie International Edition, 2022, 61(12): e202115219.

[26] [26] WANG S Y, ZHU E B, HUANG Y, et al. Direct correlation of oxygen adsorption on platinum-electrolyte interfaces with the activity in the oxygen reduction reaction［J］. Science Advances, 2021, 7(24): eabb1435.

[27] [27] LIU J, JIAO M G, MEI B B, et al. Carbon-supported divacancy-anchored platinum single-atom electrocatalysts with superhigh Pt utilization for the oxygen reduction reaction［J］. Angewandte Chemie, 2019, 58(4): 1163-1167.

[28] [28] LIU S Z, WHITE M G, LIU P. Mechanism of oxygen reduction reaction on Pt(111) in alkaline solution: importance of chemisorbed water on surface［J］. The Journal of Physical Chemistry C, 2016, 120(28): 15288-15298.

[29] [29] XU S C, KIM Y, HIGGINS D, et al. Building upon the Koutecky-Levich equation for evaluation of next-generation oxygen reduction reaction catalysts［J］. Electrochimica Acta, 2017, 255: 99-108.

[30] [30] XIE X H, HE C, LI B Y, et al. Performance enhancement and degradation mechanism identification of a single-atom Co-N-C catalyst for proton exchange membrane fuel cells［J］. Nature Catalysis, 2020, 3(12): 1044-1054.

[31] [31] ZHANG J W, YUAN Y L, GAO L, et al. Stabilizing Pt-based electrocatalysts for oxygen reduction reaction: fundamental understanding and design strategies［J］. Advanced Materials, 2021, 33(20): e2006494.

[32] [32] SHUKLA A K, RAMAN R K. Methanol-resistant oxygen-reduction catalysts for direct methanol fuel cells［J］. Annual Review of Materials Research, 2003, 33: 155-168.

[34] [34] OSMIERI L, ESCUDERO-CID R, MONTEVERDE VIDELA A H A, et al. Performance of a Fe-N-C catalyst for the oxygen reduction reaction in direct methanol fuel cell: cathode formulation optimization and short-term durability［J］. Applied Catalysis B: Environmental, 2017, 201: 253-265.

[35] [35] HOLADE Y, SAHIN N, SERVAT K, et al. Recent advances in carbon supported metal nanoparticles preparation for oxygen reduction reaction in low temperature fuel cells［J］. Catalysts, 2015, 5(1): 310-348.

[36] [36] WANG D W, SU D S. Heterogeneous nanocarbon materials for oxygen reduction reaction［J］. Energy & Environmental Science, 2014, 7(2): 576-591.