首页|Bifunctional Mesoporous MO x (M?=?Cr, Fe, Co, Ni, Ce) Oxygen Electrocatalysts for Platinum Group Metal‐Free Oxygen Pumps
Bifunctional Mesoporous MO x (M?=?Cr, Fe, Co, Ni, Ce) Oxygen Electrocatalysts for Platinum Group Metal‐Free Oxygen Pumps
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NSTL
Wiley
Bifunctional electrocatalysts with both accelerated oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) enable high‐power density electricity storage and decentralized extraction of pure oxygen from air for usage in health care. Herein, a hydrothermal synthesis employing the anionic surfactant sodium dodecyl sulfate as structure‐directing agent is developed to fabricate a family of crystalline mesoporous metal oxides (meso‐MO X , M?=?Cr, Fe, Co, Ni, Ce). The pore size and specific surface area depend on the metal used and they range from 3 to 6?nm and 60 to 200?m2?g?1, respectively. NiO and Co3O4 show a higher catalytic efficiency in alkaline media in comparison with the other oxides studied, and their activities are comparable with the values reported for platinum group metal (PGM)‐based electrocatalysts. This stems from lower voltage losses and by the presence of specific hydroxide adsorbates on the surface. Both ORR and OER driven on Co3O4 show the unified rate‐determining chemical step (|OO?|? ads + H2O ? |OOH|? ads + OH?, where | X | ads are the species adsorbed on active sites). The bifunctional ORR/OER electrocatalysis obtained on mesoporous NiO is utilized for the first symmetrical PGM‐free oxygen pump fed by air and water only.
mesoporous metal oxidesoxygen evolution reactionoxygen pumpsoxygen reduction reactionsoft-templating
Zhixing Wu、Mikhail Vagin、Robert Boyd、Grzegorz Greczynski、Penghui Ding、Magnus Odén、Emma M. Bj?rk
NSTL
Wiley
