TY - JOUR
T1 - Two-dimensional hetero-nanostructured electrocatalyst of Ni/NiFe-layered double oxide for highly efficient hydrogen evolution reaction in alkaline medium
AU - Tian, Yakun
AU - Huang, Aijian
AU - Wang, Zhiguo
AU - Wang, Mingkui
AU - Wu, Qingsheng
AU - Shen, Yan
AU - Zhu, Quanjing
AU - Fu, Yongqing
AU - Wen, Ming
N1 - Funding information: This work was financially supported by the National Natural Science Foundation of China (NSFC Nos: 22171212, 21771140, 51771138), International Corporation Project of Shanghai Committee of Science and Technology by China (No. 21160710300), International Exchange Grant (IEC/NSFC/201078) through Royal Society UK and NSFC, and the DFT was carried out at National Supercomputer Center in Tianjin, and the calculations were performed on TianHe-1(A).
PY - 2021/12/15
Y1 - 2021/12/15
N2 - High-performance, cost-effective and stable electrocatalysts are critical for hydrogen evolution reaction (HER) via water splitting in alkaline media. Herein a unique hetero-nanostructured Ni/NiFe-layered double oxide (Ni/NiFe-LDO) on Ni foam (NF) has been successfully constructed through phase-transition and controlled in-situ reduction process. Because the two-dimensional (2D) morphology of NiFe-LDO nanosheets can stabilize uniform in-situ formed nano-Ni sites, the prepared Ni/NiFe-LDO on NF displays a high catalytic activity for HER in 1.0 M KOH solution, which requires an extremely low overpotential of 29 mV to afford a current density at 10 mA cm−2, achieves a Tafel slope of 82 mV dec-1 and maintains an excellent stability of electrolysis for at least 24 h. Detail characterizations reveal that the synergistic effect between nano-Ni and NiFe-LDO nanosheets contributes to the prominent HER activity. In NiFe-LDO, Fe2O3 facilitates the adsorption of H2O on the interface region of Ni-Fe2O3, which is beneficial for water activation, then NiO offers the active sites for hydroxyl adsorption (*OH), meanwhile nano-Ni sites are active to adsorb hydrogen intermediates (H*). All of the above accelerates the water dissociation in Volmer-step reaction.
AB - High-performance, cost-effective and stable electrocatalysts are critical for hydrogen evolution reaction (HER) via water splitting in alkaline media. Herein a unique hetero-nanostructured Ni/NiFe-layered double oxide (Ni/NiFe-LDO) on Ni foam (NF) has been successfully constructed through phase-transition and controlled in-situ reduction process. Because the two-dimensional (2D) morphology of NiFe-LDO nanosheets can stabilize uniform in-situ formed nano-Ni sites, the prepared Ni/NiFe-LDO on NF displays a high catalytic activity for HER in 1.0 M KOH solution, which requires an extremely low overpotential of 29 mV to afford a current density at 10 mA cm−2, achieves a Tafel slope of 82 mV dec-1 and maintains an excellent stability of electrolysis for at least 24 h. Detail characterizations reveal that the synergistic effect between nano-Ni and NiFe-LDO nanosheets contributes to the prominent HER activity. In NiFe-LDO, Fe2O3 facilitates the adsorption of H2O on the interface region of Ni-Fe2O3, which is beneficial for water activation, then NiO offers the active sites for hydroxyl adsorption (*OH), meanwhile nano-Ni sites are active to adsorb hydrogen intermediates (H*). All of the above accelerates the water dissociation in Volmer-step reaction.
KW - Alkaline medium
KW - Electrocatalysis
KW - Heterostructure
KW - Hydrogen evolution reaction
KW - Ni/NiFe-layered double oxide
UR - http://www.scopus.com/inward/record.url?scp=85113610613&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2021.131827
DO - 10.1016/j.cej.2021.131827
M3 - Article
SN - 1385-8947
VL - 426
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 131827
ER -
