This paper explores the convergence of a class of optimally conditioned self scaling variable metric (OCSSVM) methods for unconstrained optimization. We show that this class of methods with Wolfe line search are glob...This paper explores the convergence of a class of optimally conditioned self scaling variable metric (OCSSVM) methods for unconstrained optimization. We show that this class of methods with Wolfe line search are globally convergent for general convex functions.展开更多
Nickel foam(NF)self-supported NiFe LDH electrodes have been widely studied for their excellent oxygen evolution reaction(OER)performance.However,the performance of electrodes synthesized via conventional electrodeposi...Nickel foam(NF)self-supported NiFe LDH electrodes have been widely studied for their excellent oxygen evolution reaction(OER)performance.However,the performance of electrodes synthesized via conventional electrodeposition or hydrothermal methods are still unsatisfactory owing to their insufficient specific surface area and suboptimal activity.In this study,we report NF-supported NiFe LDH electrodes directly derived from NF-supported-bimetallic MOF-74(NiFe).The as-prepared NiFe LDH exhibited a hierarchical structure and inherited the molecular level porosity of the MOF-74 precursor.The as-prepared electrode underwent self-optimization during the OER process,significantly increasing the electrochemical active surface area and providing numerous catalytic sites.In addition,the 2,5-dihydroxyterephthalate(DHTP)ligand released from MOF-74 during its dissociation chemically modified NiFe LDH.This ligand promoted the formation of Ni(III)and resisted Cl-corrosion.Thus,LDH-MOF74@NF outperformed almost all previously reported NiFe LDH@NF electrodes,exhibiting excellent OER performance and high durability in KOH and KOH/NaCl solutions with overpotentials of 244 mV and 254 mV at 100 mA cm-2,respectively.展开更多
文摘This paper explores the convergence of a class of optimally conditioned self scaling variable metric (OCSSVM) methods for unconstrained optimization. We show that this class of methods with Wolfe line search are globally convergent for general convex functions.
基金supported by the National Natural Science Foundation of China(no.52071283)Zhejiang Provincial Natural Science Foundation of China(LZ24E010001)Zhejiang Province High-level Talent Supporting Program(2022R52001).
文摘Nickel foam(NF)self-supported NiFe LDH electrodes have been widely studied for their excellent oxygen evolution reaction(OER)performance.However,the performance of electrodes synthesized via conventional electrodeposition or hydrothermal methods are still unsatisfactory owing to their insufficient specific surface area and suboptimal activity.In this study,we report NF-supported NiFe LDH electrodes directly derived from NF-supported-bimetallic MOF-74(NiFe).The as-prepared NiFe LDH exhibited a hierarchical structure and inherited the molecular level porosity of the MOF-74 precursor.The as-prepared electrode underwent self-optimization during the OER process,significantly increasing the electrochemical active surface area and providing numerous catalytic sites.In addition,the 2,5-dihydroxyterephthalate(DHTP)ligand released from MOF-74 during its dissociation chemically modified NiFe LDH.This ligand promoted the formation of Ni(III)and resisted Cl-corrosion.Thus,LDH-MOF74@NF outperformed almost all previously reported NiFe LDH@NF electrodes,exhibiting excellent OER performance and high durability in KOH and KOH/NaCl solutions with overpotentials of 244 mV and 254 mV at 100 mA cm-2,respectively.
