Electronic Supplementary Material Antiferromagnetic element Mn modified PtCo truncated octahedral nanoparticles with enhanced activity and durability for direct methanol fuel cells Qiqi Zhang1,§, Jialong Liu2,§, Tianyu Xia3 (), Jie Qi1, Haochang Lyu1, Baoyuan Luo1, Rongming Wang4, Yizhong Guo5, Lihua Wang5, and Shouguo Wang1,4 () 1 Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 3 Key Laboratory of Material Physics of Ministry of Education, School of Physics and Engineering, Zhengzhou University, Zhengzhou 450052, China 4 Institute for multidisciplinary Innovation, University of Science and Technology Beijing, Beijing 100083, China 5 Beijng Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China § Qiqi Zhang and Jialong Liu contributed equally to this work. Supporting information to https://doi.org/10.1007/s12274-019-2479-4 Figure S1 (a-d) TEM images of Mn-PtCo TONPs with different Mn contents, inset: size distribution and high-resolution image with scale bar of 2 nm. Address correspondence to Tianyu Xia, [email protected]; Shouguo Wang, [email protected] Nano Res. Figure S2 (a-c) TEM image of Pt, PtCo, PtMn NPs prepared by the same experimental conditions, respectively. Figure S3 (a-f) TEM image of Mn-PtCo-3 samples acquired with reaction time of 1h, 2h, 3h, 4h, 12h, 16h, respectively. Figure S4 (a) TEM image of as-prepared sample with precursors replaced by K2PtCl6, CoCl2∙6H2O, and MnCl2∙4H2O. (b) TEM image of as-prepared sample with DMF replaced by OAm. | www.editorialmanager.com/nare/default.asp Nano Res. Figure S5 (a-d) M-H loops of Mn-PtCo-1~5 TONPs (except Mn-PtCo-3) and PtCo TONPs, respectively. Black, blue and red lines represent the results measured at 10 K, 200 K and 300 K, respectively. Figure S6 (a-d) ZFC/FC curves of Mn-PtCo-1~5 TONPs (except Mn-PtCo-3) and PtCo TONPs. www.theNanoResearch.com∣www.Springer.com/journal/12274 | Nano Research Nano Res. –1 –1 –1 Figure S7 (a) LSV curves of Mn-PtCo TONPs in 0.5 mol L H2SO4 and 1 mol L CH3OH with a low scan rate of 5 mV s . (b) LSV curves of Mn-PtCo TONPs at 0.2-0.45 V. Figure S8 CV curves of Mn-PtCo-3, PtCo, Pt/C before and after 2000 cycles in 0.5 M H2SO4 solution with 1 M CH3OH (a-c) and in 0.5 M H2SO4 solution (d-f), respectively. | www.editorialmanager.com/nare/default.asp .