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Tunable and Specific Formation of C@NiCoP Peapods with Enhanced HER Activity and Lithium Storage Performance
Author(s) -
Bai Yuanjuan,
Zhang Huijuan,
Liu Li,
Xu Haitao,
Wang Yu
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201504154
Subject(s) - lithium (medication) , materials science , chemistry , medicine
Abstract The superior properties of nanomaterials with a special structure can provide prospects for highly efficient water splitting and lithium storage. Herein, we fabricated a series of peapodlike C@Ni 2− x Co x P ( x ≤1) nanocomposites by an anion‐exchange pathway. The experimental results indicated that the HER activity of C@Ni 2− x Co x P catalyst is strongly related to the Co/Ni ratio, and the C@NiCoP got the highest HER activity with low onset potential of ∼45 mV, small Tafel slope of ∼43 mV dec −1 , large exchange current density of 0.21 mA cm −2 , and high long‐term durability (60 h) in 0.5 m H 2 SO 4 solutions. Equally importantly, as an anode electrode for lithium batteries, this peapodlike C@NiCoP nanocomposite gives excellent charge–discharge properties (e.g., specific capacity of 670 mAh g −1 at 0.2 A g −1 after 350 cycles, and a reversible capacity of 405 mAh g −1 at a high current rate of 10 A g −1 ). The outstanding performance of C@NiCoP in HER and LIBs could be attributed to the synergistic effect of the rational design of peapodlike nanostructures and the introduction of Co element.