Two-dimensional Spinel Structured Co-based Materials for High Performance Supercapacitors: A Critical Review

Morphology controlled hierarchical NiS/carbon hexahedrons derived from nitrilotriacetic acid-assembly strategy for high-performance hybrid supercapacitors

Among the popular electrochemical energy storage devices, supercapacitors (SCs) have attracted much attention due to their long cycle life, fast charge and discharge, safety, and reliability. Transition metal oxides are one of the most widely used electrode materials in SCs because of the high specific capacitance. Among various transition metal oxides, Co3O4 and related composites are widely reported in SCs electrodes. In this review, we introduce the synthetic methods of Co3O4, including the hydrothermal/solvothermal method, sol-gel method, thermal decomposition, chemical precipitation, electrodeposition, chemical bath deposition, and the template method. The recent progress of Co3O4-containing electrode materials is summarized in detail, involving Co3O4/carbon, Co3O4/conducting polymer, and Co3O4/metal compound composites. Finally, the current challenges and outlook of Co3O4 and Co3O4-containing composites are put forward.

https://www.mdpi.com/1420-3049/25/2/269/pdf

Recent Advance in Co3O4 and Co3O4-Containing Electrode Materials for High-Performance Supercapacitors.

Cobalt-oxide/carbon composites for asymmetric solid-state supercapacitors

One-dimensional porous Co3O4 nanowires are successfully prepared by thermal decomposition of a coordination polymer, using nitrilotriacetic acid (NA) as a chelating agent via a solvothermal method. The Co3O4 nanowires with porous structure comprise numerous nanoparticles and maintain the nanowire structure of Co–NA precursors. When evaluated for supercapacitor electrode materials, Co3O4 nanowires exhibit superior electrochemical properties. A high specific capacitance of 2815.7 F g−1 at 1 A g−1 can be observed with a desirable rate specific capacitance of 765 F g−1 at 20 A g−1. Fortunately, the capacitive behaviors of the obtained porous Co3O4 nanowire electrodes are superior among reported cobalt oxides, and the excellent coulombic efficiency (about 100%) and good cycling property demonstrate high electrochemical stability and tremendous potential for high performance supercapacitors.

Facile fabrication of porous Co3O4 nanowires for high performance supercapacitors

Au nano-flower/organic polymer heterojunction-based cathode photochemical biosensor with reduction-accelerated quenching effect of porphyrin manganese.

In this work, a novel electrochemical biosensor with amplification of highly efficient triple-recycle catalytic hairpin assembly (CHA) and tetris hybridization chain reaction (THCR) was designed for ultrasensitive detection of target ATP. The target-induced triple-recycle could accomplish the highly efficient conversion of limited ATP into plentiful output dsDNA H1-H2 complex owing to the avoiding of waste DNA generation during the whole reaction process. Ingeniously, the THCR triggered by H1-H2 complex produced the tetris and compact DNA nanostructure, thereby providing more binding sites for loading substantial mimicking enzyme manganese porphyrin (MnPP) compared with that of traditional linear structure. Since the MnPP could mimic the catalytic activity of horseradish peroxidase (HRP), a mass of insoluble precipitate benzo-4-chlorohexadienone (4-CD) could thus be in-situ obtained on electrode to hamper electron transfer in the assistant of 4-chloro-1-naphthol (4-CN) and H2O2. As a result, the proposed biosensor showed a linear range from 100 fM to 100 nM and a detection limit down to 30 fM, which provided a new approach for achieving the highly sensitive and selective analysis by using simple and effective amplifying strategy. 

An ultrasensitive electrochemical biosensor with amplification of highly efficient triple catalytic hairpin assembly and tetris hybridization chain reaction

AuNPs/CdS QDs/CeO2 ternary nanocomposite coupled with scrollable three-dimensional DNA walker mediated cycling amplification for sensitive photoelectrochemical miRNA assay.

In this work, a novel conjugated microporous polymer on carbon nanotube composite (CMP-CNTs) was synthesized as photoelectrochemical (PEC) signal probe to construct sensitive PEC biosensor for sensing N-Gene of COVID-19 by integrating with an ingenious target-trigger T-junction recycling dual-strand displacement amplification (T-DSDA). The CMP-CNTs composites has an ideal photoelectrical conversion efficiency owing to the appearance of a good band matching that can effectively promote electron-hole pairs separation and accelerate carrier migration, thereby generating an extremely high initial photocurrent. Meanwhile, the T-DSDA with superior target conversion efficiency to traditional approaches could convert the small number of targets into extensive output DNAs, leading to the in-situ generation of quench agent N-GQDS decorated nanowires on electrode for significantly reducing initial photocurrent. The results demonstrated that proposed PEC biosensor had a high sensitivity towards N-Gene of COVID-19 and the detection limit was 33 aM, which provided a new way to build the simple, sensitive, and reliable sensing platform for great potential in biological analysis and early clinical diagnosis. • New CMP-CNTs composites have a good energy band matching, which can boost visible light absorption efficiency. • A target-trigger T-junction dual-strand displacement amplification transform small targets into massive output DNAs. • Output DNAs trigger HCR to generate N-GQDs modified nanowires in situ, which significantly reduces the PEC signal. • The proposed PEC biosensor of CMP-CNTs composites achieved ultra-sensitive detection of N-Gene of COVID-19. 

Photoactive Conjugated Microporous Polymer/Carbon Nanotube Coupled with T-junction Recycling Dual-Strand Displacement Amplification for Sensing N-Gene of COVID-19

Qiao Ding

Papers

Facile fabrication of porous Co3O4 nanowires for high performance supercapacitors

Au nano-flower/organic polymer heterojunction-based cathode photochemical biosensor with reduction-accelerated quenching effect of porphyrin manganese.

An ultrasensitive electrochemical biosensor with amplification of highly efficient triple catalytic hairpin assembly and tetris hybridization chain reaction

AuNPs/CdS QDs/CeO2 ternary nanocomposite coupled with scrollable three-dimensional DNA walker mediated cycling amplification for sensitive photoelectrochemical miRNA assay.

Photoactive Conjugated Microporous Polymer/Carbon Nanotube Coupled with T-junction Recycling Dual-Strand Displacement Amplification for Sensing N-Gene of COVID-19