TY - JOUR
T1 - Cerium Phosphate as a Novel Cocatalyst Promoting NiCo2O4 Nanowire Arrays for Efficient and Robust Electrocatalytic Oxygen Evolution
AU - Gao, Wei
AU - Gou, Wangyan
AU - Ma, Yuanyuan
AU - Wei, Renjie
AU - Ho, Johnny C.
AU - Qu, Yongquan
N1 - Funding Information:
The authors acknowledge the financial support from the National 1000-Plan program, National Natural Science Foundation of China (grant 21872109), the Fundamental Research Funds for the Central Universities (3102019QD0406), the Science Technology and Innovation Committee of Shenzhen Municipality (grant JCYJ20170818095520778), and the Environment and Conservation Fund of Hong Kong SAR, China (ECF 2016-85). Y.Q. also acknowledges support from the Cyrus Tang Foundation through the Tang Scholar Program.
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/8/26
Y1 - 2019/8/26
N2 - Incorporating electrocatalysts with rare earth elements has attracted increasing attention in electrocatalysis because of its effective modulation of their chemical and electronic structures for enhanced catalytic hydrogen and oxygen evolution reactions. Herein, cerium phosphate (CePO4) is demonstrated to be a novel cocatalyst that significantly enhances the OER performance of NiCo2O4 nanowire arrays on Ni foam. The high durability of OER performance over 1000 h and the low overpotential of 281 mV required to maintain a catalytic current density of 20 mA cm-2 can be attributed to the synergetic effect between CePO4 and NiCo2O4. Explicitly, CePO4 as a cocatalyst efficiently tunes the surface states of NiCo2O4 and facilitates water adsorption and the conversion of intermediates, leading to a substantial OER performance enhancement. All results exhibit the potential of integrating CePO4 into NiCo2O4 to improve the water oxidation activity of NiCo2O4 and illustrate wide domains of application by combining rare earth elements into electrocatalysts.
AB - Incorporating electrocatalysts with rare earth elements has attracted increasing attention in electrocatalysis because of its effective modulation of their chemical and electronic structures for enhanced catalytic hydrogen and oxygen evolution reactions. Herein, cerium phosphate (CePO4) is demonstrated to be a novel cocatalyst that significantly enhances the OER performance of NiCo2O4 nanowire arrays on Ni foam. The high durability of OER performance over 1000 h and the low overpotential of 281 mV required to maintain a catalytic current density of 20 mA cm-2 can be attributed to the synergetic effect between CePO4 and NiCo2O4. Explicitly, CePO4 as a cocatalyst efficiently tunes the surface states of NiCo2O4 and facilitates water adsorption and the conversion of intermediates, leading to a substantial OER performance enhancement. All results exhibit the potential of integrating CePO4 into NiCo2O4 to improve the water oxidation activity of NiCo2O4 and illustrate wide domains of application by combining rare earth elements into electrocatalysts.
UR - http://www.scopus.com/inward/record.url?scp=85072295320&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85072295320&partnerID=8YFLogxK
U2 - 10.1021/acsaem.9b00903
DO - 10.1021/acsaem.9b00903
M3 - Article
AN - SCOPUS:85072295320
SN - 2574-0962
VL - 2
SP - 5769
EP - 5776
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
IS - 8
ER -