Crystal-match guided formation of single-crystal tricobalt tetraoxygen nanomesh as superior anode for electrochemical energy storage

Abstract

In this article, we introduce a novel two-dimensional (2D) functional Co 3 O 4 nanostructure, ''nanomesh'', which possesses the highest surface area (382 m 2 g À1 ) as compared to the other Co 3 O 4 nanostructures, well-crystallized features, thickness of no more than 10 nm and a void space diameter below 6.0 nm. These structural characteristics of the nanomesh are well-suited for lithium-ion battery (LIBs) applications. In initial tests, high specific capacity (1800 mAh/g), good rate capability (above 380 mAh/g at a discharging rate of 1000 mA g À1 over 50 cycles) and stable cyclability (up to 100 cycles) have been demonstrated. In addition, the dominant ( 112) crystal plane in the nanomesh has much higher surface energy than the conventional ( 111) and ( 100) crystal planes, leading to higher activity in supercapacitors. The Co 3 O 4 nanomesh demonstrated in this research could be successfully utilized in energy and environmental applications, such as selective catalysis, gene delivery and gas or biological sensing, besides the application in electrochemical energy storage shown in this work. More importantly, the synthesis strategy used in this research can possibly be extended to other material systems as a general approach to fabricate 2D mesoporous oxides.

Free-standing and porous hierarchical nanoarchitectures constructed with cobalt cobaltite nanowalls for supercapacitors with high specific capacitances

“…All of the curves mainly exhibit pseudocapacitance features caused by the fast and reversible faradaic redox reaction of the materials [34]. Two pairs of redox peaks can be clearly observed at scan rate of 5 mV s À1 , which correspond to 3) and (4)) [53]:…”

Template‐Based Engineering of Carbon‐Doped Co3O4 Hollow Nanofibers as Anode Materials for Lithium‐Ion Batteries

“…and the formation of Co-O-C structure. [ 28 ] Cation-doped carbon atoms form a carbonate-type structure, [ 29 ] which can be identifi ed by Fourier transform infrared spectroscopy (FTIR) spectra in Figure 3 d. The peak observed at 1409 cm −1 is assigned to the stretching vibration of CO 3 2− in C-doped Co 3 O 4 .…”

“…[ 38 ] Figure 6 b depicts the 1st, 2nd, 15th, 50th, and 100th cycle chargedischarge profi les of C-doped Co 3 O 4 HNFs at a current density of 200 mA g −1 in the potential range from 0.01 to 3 V, which is similar to previously reported transition metal oxide-based anodes. [ 39 ] The initial discharge and charge capacities of C-doped Co 3 Figure S16b, Supporting Information). The initial capacity loss can be mainly ascribed to the irreversible formation of the SEI layer on electrode surface [ 40 ] or the incomplete extraction of Li + ions from active materials.…”

“…[1][2][3] Nevertheless, poor electric conductivity, large volume change during Li + ion insertion/extraction, and subsequently electrode pulverization lead to poor cyclability. [ 4 ] To date, tackling above-mentioned issues requires an effective material design strategy, which relies on fi nding an appropriate structure to satisfy the following criteria: (a) excellent conductivity, (b) fast Li + ion transport, (c) suffi cient space for potential volume expansion, and (d) high surface-to-volume ratio.…”

Mesoporous Co3O4 materials obtained from cobalt–citrate complex and their high capacitance behavior

“…Mesoporous Co 3 O 4 monolayer hollow-sphere array was fabricated by electrodepositing from aqueous solution containing cobalt precursor and exhibits a specific capacitances of 358 F g À1 at 2 A g À1 [14]. With the exposed crystal plane (112), Co 3 O 4 nanomesh obtained from pyrolysis of the precursor of (NH 4 ) 2 Co 8 (CO 3 ) 6 (OH)$4H 2 O and showed the high capacitances (155e198 F g À1 ) and good rate capability [15].…”