Affiliation:
1. College of Materials Science and Engineering North Minzu University Yinchuan 750021 P. R. China
Abstract
AbstractExploration of high‐performance aqueous ammonium‐ions hybrid supercapacitor has attracted tremendous research attention recently. Herein, structural reconstructed cobalt‐iron layered double hydroxides (SR‐CoFe LDHs) featuring copious structure defects (i. e., oxygen‐vacancies, M−O bonds, MOO− bonds, coexistence of Co2+/Co3+ and Fe2+/Fe3+) are reported as a high‐capacity cathode for NH4+ storage. The resulting SR‐CoFe LDHs can deliver a reversible capacity of 167.9 mAh g−1 at 0.5 A g−1, which is 3.3 folds higher than that of pristine CoFe‐LDHs. Ex‐situ experimental results and theoretical studies denote that the presence of structural defects in the CoFe‐LDHs can lower the NH4+ adsorption energy and induced electron delocalization to enhance the electrical conductivity, rendering the CoFe‐LDHs exhibits excellent performance for NH4+ storage. As a proof of concept, ammonium‐ion hybrid supercapacitor has been assembled with CoFe‐LDHs as the cathode and hierarchical carbon as the anode, which can deliver a large specific capacitance of 238.3 F g−1, long cycle stability over 10000 cycles, and high energy density of 66.2 Wh kg−1 within a wide working voltage of 2 V. Overall, this work offers some insights into the design of high capacity cathode for aqueous NH4+ storage and also illustrates the construction of aqueous hybrid devices with NH4+ as the charge carrier.
Funder
National Natural Science Foundation of China
Key Research and Development Program of Ningxia
Subject
General Energy,General Materials Science,General Chemical Engineering,Environmental Chemistry
Cited by
26 articles.
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