TY - JOUR
T1 - Ni-Fe-Cu-layered double hydroxides as high-performance electrocatalysts for alkaline water oxidation
AU - Enhtuwshin, Enhbayar
AU - Mhin, Sungwook
AU - Kim, Kang Min
AU - Ryu, Jeong Ho
AU - Kim, So Jung
AU - Jung, Sun Young
AU - Kang, Sukhyun
AU - Choi, Seunggun
AU - Han, Hyuk Su
N1 - Publisher Copyright:
© 2021 John Wiley & Sons Ltd.
PY - 2021/8
Y1 - 2021/8
N2 - Alkaline oxygen evolution reaction (OER) electrocatalysts have been widely studied for improving the efficiency and green hydrogen production through electrochemical water splitting. Currently, iron-doped nickel-LDHs (NF-LDHs) are regarded as the benchmark electrocatalyst for alkaline OER, primarily owing to the physicochemical synergetic effects between Ni and Fe. Here, the third element addition into NF-LDHs is designed to further enhance the electrocatalytic performance through the modulation of electronic property. Cu-doped NF-LDHs (NFC-LDHs) are developed with the self-supported structure on porous supports. NFC-LDHs can be grown on carbon cloth (CC) in an intriguing 2D nanosheet structure, wherein the surface electronic configuration is suitably modulated by interactions among Ni-Fe-Cu. Importantly, activation energy for OER can be lowered by adding Cu into NF-LDHs. Thereby, the NFC-LDHs exhibited enhanced OER activity and improved stability than those of nickel-LDHs (Ni-LDHs) and NF-LDHs. For NFC-LDHs, small overpotentials of only 230 and 250 mV yield current densities of 50 and 100 mA cm−2, respectively. In addition, excellent electrochemical stability is demonstrated during long-term OER tests without any degradation demonstrating no dissolution of active metals water electrolysis due to synergetic effects among Ni-Fe-Cu.
AB - Alkaline oxygen evolution reaction (OER) electrocatalysts have been widely studied for improving the efficiency and green hydrogen production through electrochemical water splitting. Currently, iron-doped nickel-LDHs (NF-LDHs) are regarded as the benchmark electrocatalyst for alkaline OER, primarily owing to the physicochemical synergetic effects between Ni and Fe. Here, the third element addition into NF-LDHs is designed to further enhance the electrocatalytic performance through the modulation of electronic property. Cu-doped NF-LDHs (NFC-LDHs) are developed with the self-supported structure on porous supports. NFC-LDHs can be grown on carbon cloth (CC) in an intriguing 2D nanosheet structure, wherein the surface electronic configuration is suitably modulated by interactions among Ni-Fe-Cu. Importantly, activation energy for OER can be lowered by adding Cu into NF-LDHs. Thereby, the NFC-LDHs exhibited enhanced OER activity and improved stability than those of nickel-LDHs (Ni-LDHs) and NF-LDHs. For NFC-LDHs, small overpotentials of only 230 and 250 mV yield current densities of 50 and 100 mA cm−2, respectively. In addition, excellent electrochemical stability is demonstrated during long-term OER tests without any degradation demonstrating no dissolution of active metals water electrolysis due to synergetic effects among Ni-Fe-Cu.
KW - electrocatalyst
KW - layered double hydroxide
KW - oxygen evolution reaction
KW - self-supported catalyst
KW - water splitting
UR - http://www.scopus.com/inward/record.url?scp=85110208870&partnerID=8YFLogxK
U2 - 10.1002/er.6805
DO - 10.1002/er.6805
M3 - Article
AN - SCOPUS:85110208870
SN - 0363-907X
VL - 45
SP - 15312
EP - 15322
JO - International Journal of Energy Research
JF - International Journal of Energy Research
IS - 10
ER -
