title: Low Pt-Loaded Mesoporous Sodium Germanate as a High-Performance Electrocatalyst for the Oxygen Reduction Reaction.
abstract: Although Pt/C catalysts show relatively high activities for the oxygen reduction reaction (ORR) and great potential for use in polymer electrolyte membrane fuel cells, the large amount of Pt required and the poor stability of Pt/C-based catalysts remain big challenges. Herein, mesoporous Na4 Ge9 O20 micro-crystals have been successfully synthesized to serve as a new kind of electrocatalyst support owing to its special structural characteristics and high structural stability. After loading a low amount of Pt (5 wt %) nanoparticles of 2-5 nm in diameter, the obtained mesoporous Pt/Na4 Ge9 O20 composite shows not only high electrocatalytic activity for ORR in both acidic and alkaline electrolyte media, which are comparable to those of conventional 20 wt % Pt/C, but also remarkably enhanced Pt mass-specified ORR current density and durability. Synergetic catalytic effects between loaded Pt and the support for the ORR activity has been proposed.
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Science, No. 1295 Ding-xi Road, Shanghai, 200050, P.R. China.
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Science, No. 1295 Ding-xi Road, Shanghai, 200050, P.R. China.
authors.forename: Lisong
authors.initials: L
authors.lastname: Chen
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Science, No. 1295 Ding-xi Road, Shanghai, 200050, P.R. China.
authors.forename: Gang
authors.initials: G
authors.lastname: Wan
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Science, No. 1295 Ding-xi Road, Shanghai, 200050, P.R. China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Science, No. 1295 Ding-xi Road, Shanghai, 200050, P.R. China.
authors.forename: Qinglu
authors.initials: Q
authors.lastname: Kong
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Science, No. 1295 Ding-xi Road, Shanghai, 200050, P.R. China. hrchen@mail.sic.ac.cn.|Jiangsu National Synergetic Innovation Center for Advanced Materials. hrchen@mail.sic.ac.cn.
authors.forename: Hangrong
authors.initials: H
authors.lastname: Chen
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Science, No. 1295 Ding-xi Road, Shanghai, 200050, P.R. China. jlshi@mail.sic.ac.cn.|Jiangsu National Synergetic Innovation Center for Advanced Materials. jlshi@mail.sic.ac.cn.
authors.forename: Jianlin
authors.initials: J
authors.lastname: Shi
mesh_terms: D004563:Electrochemistry; D005857:Germanium / Q000737:chemistry*; D006878:Hydroxides / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D016062:Porosity; D017680:Potassium Compounds / Q000737:chemistry
chemical_list: D006878:Hydroxides; D010087:Oxides; D017680:Potassium Compounds; D005857:Germanium; D010984:Platinum; D010100:Oxygen; C029943:potassium hydroxide
keywords: electrocatalyst; fuel cells; oxygen reduction reaction; platinum; sodium germanate