"Takanori Tamaki,Hidenori Kuroki,Shun Ogura,Teruaki Fuchigami,Yoshitaka Kitamoto,Takeo Yamaguchi","Connected nanoparticle catalysts possessing a porous, hollow capsule structure as carbon-free electrocatalysts for oxygen reduction in polymer electrolyte fuel cells",,"Energy & Environmental Science",,"vol. 8","  12","  3545-3549",2015,Oct.