Origins of Boosted Charge Storage on Heteroatom‐Doped Carbons

Cui, Cuixia; Gao, Yong; Li, Jun; Yang, Chao; Li, Meng; Jin, Huile; Xia, Zhaoqiang; Dai, Liming; Lei, Yong; Wang, Jichang; Wang, Shun

doi:10.1002/ange.202000319

Cited by 24 publications

(13 citation statements)

References 40 publications

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“…44 The presence of heteroatoms in the graphene sheets bolsters charge accumulation at their sites, in the case of both oxygen and nitrogen conjugated species. 85 The site provides a higher negative potential on the Allen electronegativity scale compared to carbon, thus inducing preferred oxidation of Cu ions during electroplating and passivating the heteroatom charge. This was confirmed by the reduction of heteroatom species observed in XPS C 1s peaks in Figure 4D and by the shift of the O 1s spectrum toward CuO and Cu 2 O species reducing contribution from a hydroxyl functional group (Figure 4E).…”

Section: Discussionmentioning

confidence: 99%

Nano- and Microstructured Copper/Copper Oxide Composites on Laser-Induced Carbon for Enzyme-Free Glucose Sensors

Mamleyev

Weidler

Nefedov

et al. 2021

ACS Appl. Nano Mater.

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Low-cost enzyme-free glucose sensors with partial flexibility adaptable for wearable Internet of Things devices that can be envisioned as personalized point-of-care devices were produced by electroplating copper on locally carbonized flexible meta-polyaramid (Nomex) sheets using laser radiation. Freestanding films were annealed in nitrogen and nitrogen/air working environments, leading to the formation of Cu microspheroids and CuO urchins dispersed on the substrate film. The aggregation mechanism, crystallographic properties, surface chemistry, and electrochemical properties of the films were studied using scanning electron microscopy, X-ray diffractometry, transmission electron microscopy, X-ray photoelectron spectroscopy, and cyclic voltammetry. Cu microspheroids and CuO urchins attained activity for glucose detection and showed improvement of amperometric sensitivity to 0.25 and 0.32 mA cm −2 mM −1 , respectively. The CuO urchin film retained its chemical composition after amperometric testing, and, by rinsing, allowed multiple repetitions with reproducible results. This study opens the possibility for the fabrication of durable composite biosensors with tailored shape, capable of implementation in flexible carriers, and microfluidic systems.

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Section: Discussionmentioning

confidence: 99%

Nano- and Microstructured Copper/Copper Oxide Composites on Laser-Induced Carbon for Enzyme-Free Glucose Sensors

Mamleyev

Weidler

Nefedov

et al. 2021

ACS Appl. Nano Mater.

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“…For example, the co‐desorption of H + (Figure 3a), Na + (Figure 3b) and K + (Figure 3c) on N, P, and O triple‐doped graphene were simulated. The Na + and K + adsorption structures with the smallest chemical adsorption energy were used to adsorb protons (Figure 3d) [27d] . It was found that hydrogen adsorption energy increased from 0.07 eV to 0.13 eV for Na + pre‐adsorption, while for K + pre‐adsorption, hydrogen adsorption energy increased from 0.07 eV to 0.16 eV (Figure 3e).…”

Section: Regulation Strategies For Electrodementioning

confidence: 99%

Progress in the Regulation of Electrode/Electrolyte Interfacial Reactions toward High‐voltage Aqueous Hybrid Capacitors

Wang

et al. 2021

Batteries & Supercaps

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Aqueous energy storage devices have drawn an increasing attention benefiting from their improved safety and reduced cost against the conventional organic systems. Hybrid capacitors that combine the advantages of both secondary batteries and electric double‐layer capacitors are considered to be a promising next‐generation electrical energy storage device. However, the nature of water decomposition at relatively low potential (usually ∼1.23 V) limits the voltage window of aqueous hybrid capacitors and thereby hinders their application. For this reason, it is vital to develop the aqueous hybrid capacitors that can operate in larger voltage window by means of the electrode and electrolyte engineering. This review summarizes the design of both electrodes and electrolytes, as well as the regulating strategies at their interfaces, to expand voltage window of aqueous hybrid capacitors. Furthermore, suggestions and future vision of the high‐voltage aqueous hybrid capacitors are provided to pave the way for their practical application.

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“…Unfortunately, the practical application of SCs has been limited by their low energy density [4][5][6]. According to the equation E = 0.5CV 2 (where E, C, and V are the energy density, specific capacitance, and voltage window of the devices, respectively), numerous materials have been developed to increase the specific capacitance, with the aim of improving the energy density [7][8][9]. In contrast to the specific capacitance, the energy density is proportional to the square of the cell voltage.…”

Section: Introductionmentioning

confidence: 99%

“…However, compared with organic electrolytes with flammability and low conductivity properties, aqueous electrolytes with a sufficiently high working voltage window are considered to be an appropriate alternative to organic electrolytes [16]. In recent years, numerous materials have been designed to increase the voltage window of aqueous electrolyte SCs (AESCs), such as polyanionic molybdenophosphate [17], heteroatom-doped carbon [9], and alkali cation-doped manganese oxide [18][19][20]. These materials can effectively inhibit the occurrence of the hydrogen evolution reaction or oxygen evolution reaction in a charging-discharging process [21].…”

Section: Introductionmentioning

confidence: 99%

Enabling 2.4-V aqueous supercapacitors through the rational design of an integrated electrode of hollow vanadium trioxide/carbon nanospheres

et al. 2021

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Aqueous supercapacitors (SCs) exhibit several advantages, including high-power density, cycling durability, and safety; however, the shortage of low energy density inhibits their further application. Acquiring an excellent performance upon using simple strategies would be beneficial, but remains challenging. Here, an integrated electrode of hollow V 2 O 3 /carbon nanospheres (H-V 2 O 3 /C) was designed and synthesized for SCs. The introduction of carbon can increase the conductivity and stability, whereas the hollow structure endows H-V 2 O 3 /C with a high specific surface area and rapid transport of ions. Moreover, the H-V 2 O 3 /C integrated electrode can simultaneously work in both negative and positive potential windows. Benefiting from these advantages, the H-V 2 O 3 /C integrated electrode exhibits a specific capacitance as high as 708.6 F g −1 in a wide voltage window of −1.1-1.3 V. Furthermore, stemming from the multiple energy storage mechanisms, the aqueous integrated full SC device exhibits a wider potential window and higher energy density than the traditional (a)symmetric ones. Therefore, the proposed device delivers a wide voltage window of 2.4 V with an energy density of 96.8 W h kg −1 at a power density of 1204.6 W kg −1 , as well as superior cycling stability. This study enlightens the design and preparation of electrode materials, opening up a possible approach for developing wide-voltage aqueous SCs.

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Origins of Boosted Charge Storage on Heteroatom‐Doped Carbons

Cited by 24 publications

References 40 publications

Nano- and Microstructured Copper/Copper Oxide Composites on Laser-Induced Carbon for Enzyme-Free Glucose Sensors

Nano- and Microstructured Copper/Copper Oxide Composites on Laser-Induced Carbon for Enzyme-Free Glucose Sensors

Progress in the Regulation of Electrode/Electrolyte Interfacial Reactions toward High‐voltage Aqueous Hybrid Capacitors

Enabling 2.4-V aqueous supercapacitors through the rational design of an integrated electrode of hollow vanadium trioxide/carbon nanospheres

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