Porous Cobalt Phosphide Polyhedrons with Iron Doping as an Efficient Bifunctional Electrocatalyst

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 13; no. 40
• Main Authors: Li, Feng, Bu, Yunfei, Lv, Zijian, Mahmood, Javeed, Han, Gao‐Feng, Ahmad, Ishfaq, Kim, Guntae, Zhong, Qin, Baek, Jong‐Beom
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 25.10.2017
• Subjects: bifunctional electrocatalysts; Chemical synthesis; Cobalt; cobalt phosphide; dissociation; Doping; Hydrogen evolution reactions; Iron; iron doping; Nanotechnology; Oxygen evolution reactions; Polyhedra; Slope stability; Tafel slopes; cobalt phosphide; bifunctional electrocatalysts; dissociation; iron doping
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.201701167

Iron (Fe)‐doped porous cobalt phosphide polyhedrons are designed and synthesized as an efficient bifunctional electrocatalyst for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The synthesis strategy involves one‐step route for doping foreign metallic element and forming porous cobalt phosphide polyhedrons. With varying doping levels of Fe, the optimized Fe‐doped porous cobalt phosphide polyhedron exhibits significantly enhanced HER and OER performances, including low onset overpotentials, large current densities, as well as small Tafel slopes and good electrochemical stability during HER and OER. Porous cobalt phosphide polyhedrons doped with iron are demonstrated to be an efficient bifunctional electrocatalyst for both hydrogen and oxygen evolution reactions. With optimized iron doping, their electrocatalytic activities are significantly enhanced. The electrocatalyst exhibits low onset overpotentials, large current densities, as well as small Tafel slopes, and good electrochemical stability during hydrogen and oxygen evolution.