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Electrochemical Reduction of CO 2 to CO by a Co‐N‐C Electrocatalyst and PEM Reactor at Ambient Conditions
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Abstract
Selective electrochemical reduction of CO
2
to CO was studied using a new electrocatalyst and a gas‐electrolysis cell utilized a polymer‐electrolyte‐membrane (PEM) reactor. A selective and active electrocatalyst was prepared by partial pyrolysis of electrocatalyst precursor of Co‐4,4′‐dimethyl‐2,2’‐bipyridine (4,4’‐dmbpy) supported on Ketjenblack (KB). A heat‐treatment temperature of the Co‐4,4’‐dmbpy/KB significantly influenced on its electrocatalytic activity and 573∼673 K treatments were suitable for a selective CO
2
reduction. A high performance of CO formation (331 μmol h
−1
cm
−2
, 217 TOF(Co) h
−1
) at 20 mA cm
−2
with 72 % faradic efficiency was performed by using the optimized Co‐4,4’‐dmbpy/KB electrocatalyst at –0.75 V (SHE) and 273 K. Electrochemical silent Co species in CV studies promoted electrochemical reduction of CO
2
to CO.
Title: Electrochemical Reduction of CO
2
to CO by a Co‐N‐C Electrocatalyst and PEM Reactor at Ambient Conditions
Description:
Abstract
Selective electrochemical reduction of CO
2
to CO was studied using a new electrocatalyst and a gas‐electrolysis cell utilized a polymer‐electrolyte‐membrane (PEM) reactor.
A selective and active electrocatalyst was prepared by partial pyrolysis of electrocatalyst precursor of Co‐4,4′‐dimethyl‐2,2’‐bipyridine (4,4’‐dmbpy) supported on Ketjenblack (KB).
A heat‐treatment temperature of the Co‐4,4’‐dmbpy/KB significantly influenced on its electrocatalytic activity and 573∼673 K treatments were suitable for a selective CO
2
reduction.
A high performance of CO formation (331 μmol h
−1
cm
−2
, 217 TOF(Co) h
−1
) at 20 mA cm
−2
with 72 % faradic efficiency was performed by using the optimized Co‐4,4’‐dmbpy/KB electrocatalyst at –0.
75 V (SHE) and 273 K.
Electrochemical silent Co species in CV studies promoted electrochemical reduction of CO
2
to CO.
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