TY - JOUR
T1 - Nickel-Based Bicarbonates as Bifunctional Catalysts for Oxygen Evolution and Reduction Reaction in Alkaline Media
AU - Gui, Liangqi
AU - Chen, Yaping
AU - He, Beibei
AU - Li, Geng
AU - Xu, Jianmei
AU - Wang, Qing
AU - Sun, Wenping
AU - Zhao, Ling
N1 - Funding Information:
The project was supported by the National Natural Science Foundation of China (Grant No. 51402266), the National Natural Science Foundation of China (Grant No. 21401171).
Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/12/3
Y1 - 2018/12/3
N2 - Oxygen electrocatalysis, including the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), is one of the most important electrochemical processes for sustainable energy conversion and storage technologies. Herein, nickel-based bicarbonates are, for the first time, developed as catalysts for oxygen electrocatalysis, and demonstrate superior electrocatalytic performance in alkaline media. Iron doping can significantly tune the real valence of nickel ions, and consequently tailor the electrocatalytic ability of bicarbonates. Among the nickel-based bicarbonates, Ni0.9Fe0.1(HCO3)2 exhibits the highest bifunctional catalytic activity, with a potential difference of 0.86 V between the OER potential at a current density of 10 mA cm−2 and the ORR potential at a current density of −1 mA cm−2, which outperforms most of the reported precious-metal-free catalysts. The present work provides new insights into exploring efficient catalysts for oxygen electrocatalysis, and it suggests that, in addition to the extensively studied transition metal hydroxides and oxides, bicarbonates and carbonates also show great potential as precious metal-free catalysts.
AB - Oxygen electrocatalysis, including the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), is one of the most important electrochemical processes for sustainable energy conversion and storage technologies. Herein, nickel-based bicarbonates are, for the first time, developed as catalysts for oxygen electrocatalysis, and demonstrate superior electrocatalytic performance in alkaline media. Iron doping can significantly tune the real valence of nickel ions, and consequently tailor the electrocatalytic ability of bicarbonates. Among the nickel-based bicarbonates, Ni0.9Fe0.1(HCO3)2 exhibits the highest bifunctional catalytic activity, with a potential difference of 0.86 V between the OER potential at a current density of 10 mA cm−2 and the ORR potential at a current density of −1 mA cm−2, which outperforms most of the reported precious-metal-free catalysts. The present work provides new insights into exploring efficient catalysts for oxygen electrocatalysis, and it suggests that, in addition to the extensively studied transition metal hydroxides and oxides, bicarbonates and carbonates also show great potential as precious metal-free catalysts.
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U2 - 10.1002/chem.201804118
DO - 10.1002/chem.201804118
M3 - Article
C2 - 30193405
AN - SCOPUS:85055633750
SN - 0947-6539
VL - 24
SP - 17665
EP - 17671
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 67
ER -