TY - JOUR
T1 - Phosphate Species up to 70% Mass Ratio for Enhanced Pseudocapacitive Properties
AU - Li, Shaofeng
AU - Yu, Chang
AU - Yang, Ying
AU - Song, Xuedan
AU - Chen, Shuangming
AU - Song, Li
AU - Qiu, Bo
AU - Yang, Juan
AU - Huang, Huawei
AU - Guo, Wei
AU - Zhao, Changtai
AU - Zhang, Mengdi
AU - Qiu, Jieshan
N1 - Generated from Scopus record by KAUST IRTS on 2023-09-21
PY - 2018/12/13
Y1 - 2018/12/13
N2 - The emerging phosphate species on the surface or near-surface of electrode materials are versatile and have an intriguing ability for dramatically enhanced electrochemical performance. Unfortunately, the distribution/dispersion of phosphate species still keeps at levels on the exterior not within the interior surface of materials, and the micro-/nanoscale tuning is commonly rarely concerned and its function remains poorly understood. Herein, for the first time, well-dispersed phosphate species up to 70% mass ratio implanted within Ni-doped CoP nanowire matrix are presented via an efficient low-temperature phosphorization strategy. The resultant nanohybrids possess kinetics-favorable open frameworks with abundant mesopores and a high degree covalency in the chemical bonds, thus leading to rapid mass transport/charge transfer and enhanced redox reaction kinetics. Remarkably, the phosphate species feature superwettability toward water and strong affinity for OH− in the electrolyte, evidenced by the shortened distance and reduced adsorption energy between the OH− and the nuclear Co atoms on the nanohybrids as revealed by density functional theory calculations. As such, the nanohybrids exhibit an ultrahigh specific capacity of 250 mAh g−1 even at 50 A g−1. This work presents a deeper understanding of the dispersion and role of phosphate species for supercapacitors and other energy-related storage/conversion devices.
AB - The emerging phosphate species on the surface or near-surface of electrode materials are versatile and have an intriguing ability for dramatically enhanced electrochemical performance. Unfortunately, the distribution/dispersion of phosphate species still keeps at levels on the exterior not within the interior surface of materials, and the micro-/nanoscale tuning is commonly rarely concerned and its function remains poorly understood. Herein, for the first time, well-dispersed phosphate species up to 70% mass ratio implanted within Ni-doped CoP nanowire matrix are presented via an efficient low-temperature phosphorization strategy. The resultant nanohybrids possess kinetics-favorable open frameworks with abundant mesopores and a high degree covalency in the chemical bonds, thus leading to rapid mass transport/charge transfer and enhanced redox reaction kinetics. Remarkably, the phosphate species feature superwettability toward water and strong affinity for OH− in the electrolyte, evidenced by the shortened distance and reduced adsorption energy between the OH− and the nuclear Co atoms on the nanohybrids as revealed by density functional theory calculations. As such, the nanohybrids exhibit an ultrahigh specific capacity of 250 mAh g−1 even at 50 A g−1. This work presents a deeper understanding of the dispersion and role of phosphate species for supercapacitors and other energy-related storage/conversion devices.
UR - https://onlinelibrary.wiley.com/doi/10.1002/smll.201803811
UR - http://www.scopus.com/inward/record.url?scp=85056083900&partnerID=8YFLogxK
U2 - 10.1002/smll.201803811
DO - 10.1002/smll.201803811
M3 - Article
SN - 1613-6829
VL - 14
JO - Small
JF - Small
IS - 50
ER -