ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 5, 2024

Transition metal phosphites are attracting increased attention in the field of electrochemistry due to their open-framework structure, superior conductivity, and high stability. In this work, Ni11(HPO3)8(OH)6 (Ni-POH) nanosheet arrays were prepared from a hexamethylenetetramine solution containing varying amounts Ni(NO3)2·6H2O, employing plate-like phosphonate-based metal–organic frameworks (Ni-PMOF) as both template phosphorus source. Also, bimetallic Ni/Co-POH-x could be obtained by replacing Ni(NO3)2·6H2O with mixture Co(NO3)2·6H2O certain molar ratios, where x is ratio added Ni/Co. Experiments revealed that among as-prepared phosphites, Ni/Co-POH-2 exhibited most uniform morphology, biggest specific surface area, highest structural stability, optimum electrochemical performance supercapacitor electrode material. At current density 1 A g–1, capacitance reached 1905.60 F g–1. Notably, asymmetric supercapacitors assembled activated carbon (Ni/Co-POH-2//AC) energy 36.59 Wh kg–1 at 0.85 kW kg–1. After 5000 cycles, retention was 67.98%, showing excellent cycle The present work provides useful attempt for synthesizing MOF-derived phosphite materials storage performance.

Language: Английский