S1 Supporting Information Superior Methanol Electrooxidation Performance of (110)- Faceted Nickel Polyhedral Nanocrystals Junshan Li, a,b Yong Zuo, a,b Junfeng Liu, a,b Xiang Wang, a,b Xiaoting Yu, a,b Ruifeng Du, a,b Ting Zhang, c Maria F. Infante-Carrió, c Pengyi Tang, c Jordi Arbiol, c,d Jordi Llorca, e Zhishan Luo, a* Andreu Cabot a,d,* a Catalonia Institute for Energy Research - IREC, Sant Adrià de Besòs, Barcelona, 08930, Spain b Department of Electronics and Biomedical Engineering, Universitat de Barcelona, 08028 Barcelona, Spain c Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain d ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain e Institute of Energy Technologies, Department of Chemical Engineering and Barcelona Research Center in Multiscale Science and Engineering. Universitat Politècnica de Catalunya, EEBE, 08019 Barcelona, Spain Z. Luo current address: Department of Chemistry, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, P. R. China. Corresponding Author * Andreu Cabot: acabot@irec.cat * Zhishan luo: luozs@mail.sustc.edu.cn Contents 1. EELS compositional maps ........................................................................................................ 2 2. XPS ........................................................................................................................................... 3 3. FTIR Spectra ............................................................................................................................. 4 4. Ni spherical NCs ....................................................................................................................... 5 5. Additional electrochemistry data .............................................................................................. 6 6. Comparison of activity ............................................................................................................ 14 7. EIS analyses ............................................................................................................................ 15 8. Reference................................................................................................................................. 16 Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is © The Royal Society of Chemistry 2019