TY - JOUR
T1 - Interfacial built-in electric field in 2D Ni(OH)2 heterojunction with the sodium organic compound for enhanced oxygen evolution catalysis
AU - Zhou, Jiao
AU - Zhang, Mingyuan
AU - Ren, Baiyu
AU - Yi, Qian
AU - Yu, Hao
AU - Zhang, Baoyue
AU - Li, Ang
AU - Hu, Xinyi
AU - Li, Zhong
AU - Chen, Guanyu
AU - Cheng, Yinfen
AU - Gao, Rui
AU - Luan, Yange
AU - Zhang, Jiaru
AU - Wang, Yichao
AU - Hu, Yihong
AU - Yang, Zhiyu
AU - Liang, Bo
AU - Hao, Haigang
AU - Ou, Jian Zhen
N1 - Publisher Copyright:
© 2024 The Authors
PY - 2025/1/1
Y1 - 2025/1/1
N2 - Oxygen evolution involves a complex four-electron transfer process with sluggish reaction kinetics which leads to large cell voltages, limiting the practical applications of electrochemical hydrogen production. Driven by the urgency to design and develop highly efficient OER catalysts to improve the efficiency of water electrolysis, transition metal hydroxides are promising candidates due to their tunable OER catalytic properties. However, their intrinsic activities are hindered by poor electrical conductivity and insufficient mass transfer capability. In this study, we tune the coordination environments of central species in two-dimensional (2D) ultrathin Ni(OH)2 nanosheets with sodium dodecyl sulfate (SDS). This heterojunction features an interfacial built-in electric field (BEF) that modulates the electronic structure, bringing the d-band center of Ni closer to the Fermi energy level. This adjustment enhances electron transfer and optimizes oxygen intermediate adsorption, improving OER kinetics. Additionally, the 2D morphology and abundant porosity provide rich catalytic sites and facilitate fast electrolyte transport. Therefore, the 2D Ni(OH)2-SDS heterojunction demonstrates remarkable OER activity, with a low overpotential of 285 mV and a Tafel slope of 68 mV dec-1 at a current density of 10 mA cm−2. This work offers a novel strategy for manipulating the coordination environment and electronic structure in metal hydroxides and presents a new model for the rational selection of hetero-components in OER electrocatalysis.
AB - Oxygen evolution involves a complex four-electron transfer process with sluggish reaction kinetics which leads to large cell voltages, limiting the practical applications of electrochemical hydrogen production. Driven by the urgency to design and develop highly efficient OER catalysts to improve the efficiency of water electrolysis, transition metal hydroxides are promising candidates due to their tunable OER catalytic properties. However, their intrinsic activities are hindered by poor electrical conductivity and insufficient mass transfer capability. In this study, we tune the coordination environments of central species in two-dimensional (2D) ultrathin Ni(OH)2 nanosheets with sodium dodecyl sulfate (SDS). This heterojunction features an interfacial built-in electric field (BEF) that modulates the electronic structure, bringing the d-band center of Ni closer to the Fermi energy level. This adjustment enhances electron transfer and optimizes oxygen intermediate adsorption, improving OER kinetics. Additionally, the 2D morphology and abundant porosity provide rich catalytic sites and facilitate fast electrolyte transport. Therefore, the 2D Ni(OH)2-SDS heterojunction demonstrates remarkable OER activity, with a low overpotential of 285 mV and a Tafel slope of 68 mV dec-1 at a current density of 10 mA cm−2. This work offers a novel strategy for manipulating the coordination environment and electronic structure in metal hydroxides and presents a new model for the rational selection of hetero-components in OER electrocatalysis.
KW - 2D Ni(OH) nanosheets
KW - Built-in electric field
KW - Electrocatalysis
KW - Oxygen evolution reaction (OER)
UR - http://www.scopus.com/inward/record.url?scp=85211995878&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2024.158565
DO - 10.1016/j.cej.2024.158565
M3 - Article
AN - SCOPUS:85211995878
SN - 1385-8947
VL - 503
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 158565
ER -