title: Controllable Fabrication of Amorphous Co-Ni Pyrophosphates for Tuning Electrochemical Performance in Supercapacitors.
abstract: Incorporation of two transition metals offers an effective method to enhance the electrochemical performance in supercapacitors for transition metal compound based electrodes. However, such a configuration is seldom concerned in pyrophosphates. Here, amorphous phase Co-Ni pyrophosphates are fabricated as electrodes in supercapacitors. Through controllably adjusting the ratios of Co and Ni as well as the calcination temperature, the electrochemical performance can be tuned. An optimized amorphous Ni-Co pyrophosphate exhibits much higher specific capacitance than monometallic Ni and Co pyrophosphates and shows excellent cycling ability. When employing Ni-Co pyrophosphates as positive electrode and activated carbon as a negative electrode, the fabricated asymmetric supercapacitor cell exhibits favorable capacitance and cycling ability. This study provides facile methods to improve the transition metal pyrophosphate electrodes for efficient electrodes in electrochemical energy storage devices.
authors.affiliation: School of Materials Science and Engineering, Central South University , Changsha, Hunan 410083, China.|School of Minerals Processing and Bioengineering, Central South University , Changsha, Hunan 410083, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Chen
authors.affiliation: School of Materials Science and Engineering, Central South University , Changsha, Hunan 410083, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Zhang
authors.affiliation: School of Materials Science and Engineering, Central South University , Changsha, Hunan 410083, China.
authors.forename: Yulu
authors.initials: Y
authors.lastname: He
authors.affiliation: School of Materials Science and Engineering, Central South University , Changsha, Hunan 410083, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Liang
authors.affiliation: School of Materials Science and Engineering, Central South University , Changsha, Hunan 410083, China.|International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Renzhi
authors.initials: R
authors.lastname: Ma
authors.affiliation: School of Materials Science and Engineering, Central South University , Changsha, Hunan 410083, China.
authors.forename: Xiaohe
authors.initials: X
authors.lastname: Liu
keywords: amorphous phase; asymmetric supercapacitor; electrochemistry; electrode; nickel pyrophosphate