Sulfur-anchoring synthesis of platinum intermetallic nanoparticle catalysts for fuel cells

Science ◽  
2021 ◽  
Vol 374 (6566) ◽  
pp. 459-464
Author(s):  
Cheng-Long Yang ◽  
Li-Na Wang ◽  
Peng Yin ◽  
Jieyuan Liu ◽  
Ming-Xi Chen ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Nanoparticle Catalysts

scholarly journals Influence of gas environment and heating on atomic structures of platinum nanoparticle catalysts for proton-exchange membrane fuel cells

2019 ◽  
Vol 30 (17) ◽  
pp. 175701 ◽  
Author(s):  
Kenta Yoshida ◽  
Xudong Zhang ◽  
Yusuke Shimada ◽  
Yasuyoshi Nagai ◽  
Tomoki Hiroyama ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Platinum Nanoparticle ◽  
Nanoparticle Catalysts ◽  
Atomic Structures ◽  
Gas Environment ◽  
Exchange Membrane

scholarly journals Growth and degradation of advanced octahedral Pt-alloy nanoparticle catalysts for fuel cells

2016 ◽  
pp. 800-801
Author(s):  
Marc Heggen ◽  
Martin Gocyla ◽  
Lin Gan ◽  
Peter Strasser ◽  
Rafal Dunin-Borkowski
Keyword(s):  
Fuel Cells ◽  
Nanoparticle Catalysts ◽  
Pt Alloy

scholarly journals High crystallinity design of Ir-based catalysts drives catalytic reversibility for water electrolysis and fuel cells

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Woong Hee Lee ◽  
Young-Jin Ko ◽  
Jung Hwan Kim ◽  
Chang Hyuck Choi ◽  
Keun Hwa Chae ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Catalytic Properties ◽  
Hydrogen Oxidation ◽  
Water Electrolysis ◽  
Oxidation Reactions ◽  
Hydrogen Electrode ◽  
Positive Potential ◽  
Nanoparticle Catalysts ◽  
High Crystallinity ◽  
Hydrogen Evolution Reactions

AbstractThe voltage reversal of water electrolyzers and fuel cells induces a large positive potential on the hydrogen electrodes, followed by severe system degradation. Applying a reversible multifunctional electrocatalyst to the hydrogen electrode is a practical solution. Ir exhibits excellent catalytic activity for hydrogen evolution reactions (HER), and hydrogen oxidation reactions (HOR), yet irreversibly converts to amorphous IrOx at potentials > 0.8 V/RHE, which is an excellent catalyst for oxygen evolution reactions (OER), yet a poor HER and HOR catalyst. Harnessing the multifunctional catalytic characteristics of Ir, here we design a unique Ir-based electrocatalyst with high crystallinity for OER, HER, and HOR. Under OER operation, the crystalline nanoparticle generates an atomically-thin IrOx layer, which reversibly transforms into a metallic Ir at more cathodic potentials, restoring high activity for HER and HOR. Our analysis reveals that a metallic Ir subsurface under thin IrOx layer can act as a catalytic substrate for the reduction of Ir ions, creating reversibility. Our work not only uncovers fundamental, uniquely reversible catalytic properties of nanoparticle catalysts, but also offers insights into nanocatalyst design.

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