1.            Sharaf, O Z & Orhan, M F An overview of fuel cell technology: Fundamentals and applications. Renewable & Sustainable Energy Reviews[J], 2014, 32: 810-853.

2.            Steele, B C H & Heinzel, A Materials for fuel-cell technologies. Nature[J], 2001, 414(6861): 345-352.

3.            Debe, M K Electrocatalyst approaches and challenges for automotive fuel cells. Nature[J], 2012, 486(7401): 43-51.

4.            Badwal, S, Giddey, S, Kulkarni, A et al. Direct ethanol fuel cells for transport and stationary applications–A comprehensive review. Applied Energy[J], 2015, 145: 80-103.

5.            Wang, W, Su, C, Wu, Y et al. Progress in solid oxide fuel cells with nickel-based anodes operating on methane and related fuels. Chemical Reviews[J], 2013, 113(10): 8104-8151.

6.            Wu, G, More, K L, Johnston, C M et al. High-Performance Electrocatalysts for Oxygen Reduction Derived from Polyaniline, Iron, and Cobalt. Science[J], 2011, 332(6028): 443-447.

7.            Cui, C, Gan, L, Heggen, M et al. Compositional segregation in shaped Pt alloy nanoparticles and their structural behaviour during electrocatalysis. Nature Materials[J], 2013, 12(8): 765-771.

8.            Yu, W, Porosoff, M D & Chen, J G Review of Pt-based bimetallic catalysis: from model surfaces to supported catalysts. Chemical Reviews[J], 2012, 112(11): 5780-5817.

9.            Wang, D, Xin, H L, Hovden, R et al. Structurally ordered intermetallic platinum–cobalt core–shell nanoparticles with enhanced activity and stability as oxygen reduction electrocatalysts. Nature Materials[J], 2013, 12(1): 81-87.

10.          Sasaki, K, Naohara, H, Cai, Y et al. Core‐Protected Platinum Monolayer Shell High‐Stability Electrocatalysts for Fuel‐Cell Cathodes. Angewandte Chemie International Edition[J], 2010, 49(46): 8602-8607.

11.          Wang, G W, Huang, B, Xiao, L et al. Pt Skin on AuCu Intermetallic Substrate: A Strategy to Maximize Pt Utilization for Fuel Cells. Journal of the American Chemical Society[J], 2014, 136(27): 9643-9649.

12.          Chen, C, Kang, Y J, Huo, Z Y et al. Highly Crystalline Multimetallic Nanoframes with Three-Dimensional Electrocatalytic Surfaces. Science[J], 2014, 343(6177): 1339-1343.

13.          Holewinski, A, Idrobo, J C & Linic, S High-performance Ag-Co alloy catalysts for electrochemical oxygen reduction. Nature Chemistry[J], 2014, 6(9): 828-834.

14.          Kuttiyiel, K A, Sasaki, K, Su, D et al. Gold-promoted structurally ordered intermetallic palladium cobalt nanoparticles for the oxygen reduction reaction. Nature Communications[J], 2014, 5: 8.

15.          Lu, Y Z, Jiang, Y Y, Gao, X H et al. Strongly Coupled Pd Nanotetrahedron/Tungsten Oxide Nanosheet Hybrids with Enhanced Catalytic Activity and Stability as Oxygen Reduction Electrocatalysts. Journal of the American Chemical Society[J], 2014, 136(33): 11687-11697.

16.          Savadogo, O, Lee, K, Oishi, K et al. New palladium alloys catalyst for the oxygen reduction reaction in an acid medium. Electrochemistry Communications[J], 2004, 6(2): 105-109.

17.          Wang, X, Choi, S-I, Roling, L T et al. Palladium-platinum core-shell icosahedra with substantially enhanced activity and durability towards oxygen reduction. Nature Communications[J], 2015, 6: 7594.

18.          Miner, E M, Fukushima, T, Sheberla, D et al. Electrochemical oxygen reduction catalysed by Ni-3(hexaiminotriphenylene)(2). Nature Communications[J], 2016, 7: 7.

19.          Masa, J, Xia, W, Muhler, M et al. On the Role of Metals in Nitrogen-Doped Carbon Electrocatalysts for Oxygen Reduction. Angewandte Chemie-International Edition[J], 2015, 54(35): 10102-10120.

20.          Tang, H J, Yin, H J, Wang, J Y et al. Molecular Architecture of Cobalt Porphyrin Multilayers on Reduced Graphene Oxide Sheets for High-Performance Oxygen Reduction Reaction. Angewandte Chemie-International Edition[J], 2013, 52(21): 5585-5589.

21.          Chung, H T, Won, J H & Zelenay, P Active and stable carbon nanotube/nanoparticle composite electrocatalyst for oxygen reduction. Nature Communications[J], 2013, 4: 5.

22.          Zhao, Y, Nakamura, R, Kamiya, K et al. Nitrogen-doped carbon nanomaterials as non-metal electrocatalysts for water oxidation. Nature Communications[J], 2013, 4: 7.

23.          Feng, J, Liang, Y, Wang, H et al. Engineering manganese oxide/nanocarbon hybrid materials for oxygen reduction electrocatalysis. Nano Research[J], 2012, 5(10): 718-725.

24.          Zhao, A Q, Masa, J, Xia, W et al. Spinel Mn-Co Oxide in N-Doped Carbon Nanotubes as a Bifunctional Electrocatalyst Synthesized by Oxidative Cutting. Journal of the American Chemical Society[J], 2014, 136(21): 7551-7554.

25.          Gorlin, Y & Jaramillo, T F A Bifunctional Nonprecious Metal Catalyst for Oxygen Reduction and Water Oxidation. Journal of the American Chemical Society[J], 2010, 132(39): 13612-13614.

26.          Liang, Y, Li, Y, Wang, H et al. Co3O4 nanocrystals on graphene as a synergistic catalyst for oxygen reduction reaction. Nature Materials[J], 2011, 10(10): 780-786.

27.          Gewirth, A A & Thorum, M S Electroreduction of dioxygen for fuel-cell applications: materials and challenges. Inorganic Chemistry[J], 2010, 49(8): 3557-3566.

28.          Sedona, F, Di Marino, M, Forrer, D et al. Tuning the catalytic activity of Ag(110)-supported Fe phthalocyanine in the oxygen reduction reaction. Nature Materials[J], 2012, 11(11): 970-977.

29.          Subbaraman, R, Danilovic, N, Lopes, P P et al. Origin of Anomalous Activities for Electrocatalysts in Alkaline Electrolytes. Journal of Physical Chemistry C[J], 2012, 116(42): 22231-22237.

30.          Li, D G, Wang, C, Strmcnik, D S et al. Functional links between Pt single crystal morphology and nanoparticles with different size and shape: the oxygen reduction reaction case. Energy & Environmental Science[J], 2014, 7(12): 4061-4069.

31.          Wan, L J, Moriyama, T, Ito, M et al. In situ STM imaging of surface dissolution and rearrangement of a Pt-Fe alloy electrocatalyst in electrolyte solution. Chemical Communications[J], 2002(1): 58-59.

32.          Todoroki, N, Iijima, Y, Takahashi, R et al. Structure and Electrochemical Stability of Pt-Enriched Ni/Pt(111) Topmost Surface Prepared by Molecular Beam Epitaxy. Journal of the Electrochemical Society[J], 2013, 160(6): F591-F596.

33.          Yoshimoto, S, Tada, A & Itaya, K In situ scanning tunneling microscopy study of the effect of iron octaethylporphyrin adlayer on the electrocatalytic reduction of O-2 on Au(111). Journal of Physical Chemistry B[J], 2004, 108(17): 5171-5174.

34.          Grumelli, D, Wurster, B, Stepanow, S et al. Bio-inspired nanocatalysts for the oxygen reduction reaction. Nature Communications[J], 2013, 4: 6.

35.          Climent, V, Fu, Y C, Chumillas, S et al. Probing the Electrocatalytic Oxygen Reduction Reaction Reactivity of Immobilized Multicopper Oxidase CueO. Journal of Physical Chemistry C[J], 2014, 118(29): 15754-15765.

36.          Sun, S R, Jiang, N & Xia, D G Density Functional Theory Study of the Oxygen Reduction Reaction on Metalloporphyrins and Metallophthalocyanines. Journal of Physical Chemistry C[J], 2011, 115(19): 9511-9517.

37.          Sun, Y, Chen, K X, Jia, L et al. Toward understanding macrocycle specificity of iron on the dioxygen-binding ability: a theoretical study. Physical Chemistry Chemical Physics[J], 2011, 13(30): 13800-13808.

38.          Hulsken, B, Van Hameren, R, Gerritsen, J W et al. Real-time single-molecule imaging of oxidation catalysis at a liquid-solid interface. Nature Nanotechnology[J], 2007, 2(5): 285-289.

39.          den Boer, D, Li, M, Habets, T et al. Detection of different oxidation states of individual manganese porphyrins during their reaction with oxygen at a solid/liquid interface. Nature Chemistry[J], 2013, 5(7): 621-627.

40.          Li, M, den Boer, D, Iavicoli, P et al. Tip-induced chemical manipulation of metal porphyrins at a liquid/solid interface. Journal of the American Chemical Society[J], 2014, 136(50): 17418-17421.

41.          Nie, Y, Li, L & Wei, Z D Recent advancements in Pt and Pt-free catalysts for oxygen reduction reaction. Chemical Society Reviews[J], 2015, 44(8): 2168-2201.

42.          Ramaswamy, N, Tylus, U, Jia, Q Y et al. Activity Descriptor Identification for Oxygen Reduction on Nonprecious Electrocatalysts: Linking Surface Science to Coordination Chemistry. Journal of the American Chemical Society[J], 2013, 135(41): 15443-15449.

43.          Jia, Q, Ramaswamy, N, Hafiz, H et al. Experimental Observation of Redox-Induced Fe-N Switching Behavior as a Determinant Role for Oxygen Reduction Activity. Acs Nano[J], 2015, 9(12): 12496-12505.

44.          Strbac, S, Srejic, I, Smiljanic, M et al. The effect of rhodium nanoislands on the electrocatalytic activity of gold for oxygen reduction in perchloric acid solution. Journal of Electroanalytical Chemistry[J], 2013, 704: 24-31.

45.  Sheng, Z H, Gao, H L, Bao, W J et al. Synthesis of boron doped graphene for oxygen reduction reaction in fuel cells. Journal of Materials Chemistry[J], 2012, 22(2): 390-395.