Designed synthesis of NiCo-LDH and derived sulfide on heteroatom-doped edge-enriched 3D rivet graphene films for high-performance asymmetric supercapacitor and efficient OER

Wearable in‐plane Zn‐based microbatteries are considered as promising micropower sources for wearable electronics due to their high capacity, low cost, high safety, and easy integration. However, their applications are severely impeded by inadequate energy density arising from unsatisfactory capacity of cathode and poor cycling stability caused by degradation of electrode materials and Zn dendrite. Additionally, the short‐circuit induced safety issue caused by Zn dendrite is still a roadblock for Zn‐based microbatteries. Herein, a textile‐based Co−Zn microbattery with ultrahigh energy density and excellent cycling stability is demonstrated. Benefiting from the fast electron transport of three‐dimensional (3D) porous Ni‐coated textile and synergistic effect from the hierarchical Co(OH)2@NiCo layered double hydroxide (LDH) core−shell electrode, the fabricated Co−Zn microbattery with high flexibility delivers superior energy/power densities of 0.17 mWh cm−2/14.4 mW cm−2, outperforming most reported micro energy storage devices. Besides, the trench‐type configuration as well as the 3D porous Zn@carbon clothes can avoid the short‐circuit‐induced safety issues, resulting in excellent cycling stability (71% after 800 cycles). The unique core−shell structure and novel configuration provide a brand‐new design strategy for high‐performance wearable in‐plane microdevices.

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“…[ 1c ] Another peak located at 650 cm −1 indicates that the NC−LDH was synthesized successfully. [ 13 ]…”

Section: Resultsmentioning

confidence: 99%

Wearable Textile‐Based Co−Zn Alkaline Microbattery with High Energy Density and Excellent Reliability

Wang

Hong

Guo

et al. 2020

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“…Therefore, numerous effective strategies based on LDHs, including the reconstruction of transition metal compounds, adjusting the proportion of metal ions, and carbon doping, have been developed to explore higher redox activity with abundant active sites. Notably, modified LDHs, such as NiCo‐LDH/MMoS x heteronanostructures, CNT@NiCo‐LDH, cactus‐like NiCoP/NiCo‐OH, H‐3DRG@NiCo 2 S 4 nanowires, and core–shell structural (Ni, Co) Se 2 /NiCo‐LDH, have displayed novel structural features and considerable exposed active sites. Nevertheless, the derived chemical species on the outer surfaces of LDHs impair the interlayer structure of LDHs to some extent and lead to pore blockage issues, which can decrease the structural stability of materials and increase the mass transport resistance.…”

Section: Introductionmentioning

confidence: 99%

In Situ Formation of Co₉S₈ Quantum Dots in MOF‐Derived Ternary Metal Layered Double Hydroxide Nanoarrays for High‐Performance Hybrid Supercapacitors

Yang

Wang

Liu

et al. 2020

Advanced Energy Materials

150

104

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Layered double hydroxides (LDHs) are promising cathode materials for supercapacitors because of the enhanced flow efficiency of ions in the interlayers. However, the limited active sites and monotonous metal species further hinder the improvement of the capacity performance. Herein, cobalt sulfide quantum dots (Co9S8‐QDs) are effectively created and embedded within the interlayer of metal‐organic‐frameworks‐derived ternary metal LDH nanosheets based on in situ selective vulcanization of Co on carbon fibers. The hybrid CF@NiCoZn‐LDH/Co9S8‐QD retains the lamellar structure of the ternary metal LDH very well, inheriting low transfer impedance of interlayer ions. Significantly, the selectively generated Co9S8‐QDs expose more abundant active sites, effectively improving the electrochemical properties, such as capacitive performance, electronic conductivity, and cycling stability. Due to the synergistic relationship, the hybrid material delivers an ultrahigh electrochemical capacity of 350.6 mAh g−1 (2504 F g−1) at 1 A g−1. Furthermore, hybrid supercapacitors fabricated with CF@NiCoZn‐LDH/Co9S8‐QD and carbon nanosheets modified by single‐walled carbon nanotubes display an outstanding energy density of 56.4 Wh kg−1 at a power density of 875 W kg−1, with an excellent capacity retention of 95.3% after 8000 charge–discharge cycles. Therefore, constructing hybrid electrode materials by in situ‐created QDs in multimetallic LDHs is promising.

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“…For replacing noble metal OER electrocatalysts, earth-abundant NiCo-based materials are considered to be one of the best OER electrocatalysts. [12][13][14][15] NiCo-layered double hydroxides (LDH) with highly tunable structure, compositional flexibility, and tunable interlayer anions is a kind of important OER catalysts. In various of NiCo-LDH materials, Ni 2 + and Co 3 + are the main existing forms.…”

Section: Introductionmentioning

confidence: 99%

Manganese‐Doped Hollow Layered Double (Ni, Co) Hydroxide Microcuboids as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

et al. 2020

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The development of low-cost, efficient, noble-metal-free electrocatalysts for the oxygen evolution reaction (OER) is important for renewable energy conversion. We prepared hierarchical hollow NiCoMn-layered double hydroxide (LDH) microcuboids that consisted of two dimensional (2D) nanosheets by using a solvothermal method. The prepared Ni 6 Co 11 Mn-LDH exhibits high OER activity, with an overpotential of 248 mV at a current density of 10 mA cm À 2 and a small Tafel slope of 72.2 mV dec À 1 , which is even better than the noble-metal RuO 2 catalyst. It remains stable after chronopotentiometric testing at a high current density of 100 mA cm À 2 for 22 h, indicating potential for practical application. The enhanced OER performance is ascribed to the transition of Ni 2 + to Ni 3 + in NiCo-LDH induced by Mn doping, which activates the Ni sites. This work provides an approach to further optimize the OER performance of NiCo-LDH based catalysts.

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Designed synthesis of NiCo-LDH and derived sulfide on heteroatom-doped edge-enriched 3D rivet graphene films for high-performance asymmetric supercapacitor and efficient OER

Abstract: A high-quality edge-enriched H-3DRG film coupled with vertically oriented electroactive inorganics for high performance asymmetric supercapacitors and OER.

Cited by 127 publications

References 70 publications

Wearable Textile‐Based Co−Zn Alkaline Microbattery with High Energy Density and Excellent Reliability

Wearable Textile‐Based Co−Zn Alkaline Microbattery with High Energy Density and Excellent Reliability

In Situ Formation of Co₉S₈ Quantum Dots in MOF‐Derived Ternary Metal Layered Double Hydroxide Nanoarrays for High‐Performance Hybrid Supercapacitors

Manganese‐Doped Hollow Layered Double (Ni, Co) Hydroxide Microcuboids as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

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Designed synthesis of NiCo-LDH and derived sulfide on heteroatom-doped edge-enriched 3D rivet graphene films for high-performance asymmetric supercapacitor and efficient OER

Abstract: A high-quality edge-enriched H-3DRG film coupled with vertically oriented electroactive inorganics for high performance asymmetric supercapacitors and OER.

Cited by 127 publications

References 70 publications

Wearable Textile‐Based Co−Zn Alkaline Microbattery with High Energy Density and Excellent Reliability

Wearable Textile‐Based Co−Zn Alkaline Microbattery with High Energy Density and Excellent Reliability

In Situ Formation of Co9S8 Quantum Dots in MOF‐Derived Ternary Metal Layered Double Hydroxide Nanoarrays for High‐Performance Hybrid Supercapacitors

Manganese‐Doped Hollow Layered Double (Ni, Co) Hydroxide Microcuboids as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

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In Situ Formation of Co₉S₈ Quantum Dots in MOF‐Derived Ternary Metal Layered Double Hydroxide Nanoarrays for High‐Performance Hybrid Supercapacitors