Photoactive Zn–air batteries using spinel-type cobalt oxide as a bifunctional photocatalyst at the air cathode

Tomon, Chanikarn; Sarawutanukul, Sangchai; Duangdangchote, Salatan; Krittayavathananon, Atiweena

doi:10.1039/c9cc01876j

Cited by 56 publications

(43 citation statements)

References 26 publications

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“…During the charging process at 2 mA cm −2 with 20 min per cycle, the oxidation reaction of MS with OH − to M−S−OH and M−S−O follows the reactions (3) and (4) . The discharging process is its reversible process reducing oxygen atoms from the M−S−O structure together with H 2 O to produce MS and OH − namely the ORR process which is in good agreement with the CV result. Furthermore, the voltage gap of the ZAB under light illumination is ca .…”

Section: Resultssupporting

confidence: 82%

Rechargeable Photoactive Zn‐Air Batteries Using NiCo₂S₄ as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Sarawutanukul

Tomon

Duangdangchote

et al. 2020

Batteries & Supercaps

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Using free solar energy in oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) electrocatalysts to enhance the efficiency of zinc‐air batteries (ZABs) has not yet been widely investigated. Herein, we report a photoactive bifunctional catalyst of spinel‐type NiCo2S4 (NCS) urchin‐like structure with rich mesopores and direct band gap energies of ca. 1.4 and 2.4 eV. The NCS catalyst exhibits high catalytic activities for both OER (ɳ=338 mV at 10 mA cm−2) and ORR (ɳ=475 mV at E1/2), comparable to that of the state‐of‐the‐art counterparts (e. g., Pt/C for ORR, RuO2 for OER). Under light illumination, the p‐type photoactive NCS catalyst can absorb visible light, generating photogenerated holes and photoelectrons via the photoelectric effect for direct conversion of photoenergy into electric energy with increasing kinetics charge transfer process and provides ca. 10 and 18.5 % lower OER and ORR overpotentials, respectively than those under the dark condition. In addition, the as‐fabricated zinc‐air battery with the photoactive NCS as the cathode exhibits decrease in voltage gap from 0.82 to 0.60 V with an increasing round‐trip efficiency from 59.2 % to 68.8 % after exposed to visible light. The zinc‐air battery with a reversible redox reaction for the simultaneous conversion of chemical and photoenergy into electric energy could open a new pathway for the utilization of a single energy conversion and storage device.

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Section: Resultssupporting

confidence: 82%

Rechargeable Photoactive Zn‐Air Batteries Using NiCo₂S₄ as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Sarawutanukul

Tomon

Duangdangchote

et al. 2020

Batteries & Supercaps

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“…Benefited from these, the battery not only showed good discharge/charge capability for 110 cycles with a high η battery (69 %), but also possessed stable and reproducible photo‐responsive behavior (Figure e–f). This work further strongly demonstrates the feasibility of strategy that introducing light to energy storage systems . Notably, photothermal effect is also utilized in this research to modulate battery performance, which provides a new idea to fully explore potential of solar energy.…”

Section: Photo‐responsive Batteries With Dual‐solid Active Materialsmentioning

confidence: 59%

Integrated Photo‐Responsive Batteries for Solar Energy Harnessing: Recent Advances, Challenges, and Opportunities

Fang

2020

ChemPlusChem

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responsive batteries that enable the effective combination of solar harvesting and energy conversion/storage functionalities render a potential solution to achieve the large-scale utilization of unlimited and cost-effective solar energy and alleviate the limits of conventional energy storage devices. The internal integration of photo-responsive electrodes into rechargeable batteries with the simplest two-electrode configuration is regarded as a reliable and appealing strategy for highly-efficient and low-cost utilization of solar energy by simplifying the device architecture and improving the energy efficiency. This progress report provides a brief review on photo-responsive batteries with integrated two-electrode configuration that can achieve solar energy conversion/storage in one single device. The basic device architecture, operating principles and practical performance of various photo-responsive systems based on solar energy harvesting in various batteries including Li ion batteries, LiÀ S batteries, LiÀ I batteries, dual-liquid redox batteries, LiÀ O 2 batteries, non-Li anode-O 2 /air batteries are summarized and discussed. Finally, the future opportunities and challenges regarding the two-electrode photo-responsive batteries are proposed.[a] Dr.

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“…Recently, cobalt hydroxide/oxide nanostructures have been used as photoactive materials which can convert the photon energy into the electrical energy via the photovoltaic effect. ,− The photon energy under light illumination can provoke cobalt hydroxides to generate the charge carriers, excited electrons (e – ) and holes (h + ) in the valence band (VB) and conduction band (CB), respectively. This process can generate the extra photocurrent, leading to higher performance when Co(OH) 2 is served as the photoelectrode.…”

Section: Introductionmentioning

confidence: 99%

Reducing the Energy Band Gap of Cobalt Hydroxide Nanosheets with Silver Atoms and Enhancing Their Electrical Conductivity with Silver Nanoparticles

2021

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Although cobalt hydroxide (Co(OH)2) has been attracting attention in several applications, its photoelectrochemical property has not yet been fully investigated. In this work, tuning the energy band gap of Co(OH)2 nanosheets with silver atoms and enhancing their electrical conductivity with silver nanoparticles were then focused. A Ag-doped α-Co(OH)2 thin film was successfully synthesized via an electrodeposition method. The optical properties of the as-prepared materials were characterized by UV–vis and fluorescence lifetime spectroscopies and further confirmed by density functional theoretical calculation. It was found that Ag atoms between adjacent layers of Co(OH)2 can reduce its electronic band gap to 2.45 eV (α-Co(OH)2) as compared to 2.85 eV of β-Co(OH)2. In terms of electrochemical properties, silver nanoparticles (AgNPs) can enhance the electrical conductivity of Co(OH)2 nanosheets, leading to faster charge transfer reducing the internal resistance and significantly increasing the overall charge storage performance. Interestingly, under light illumination, Ag-doped α-Co(OH)2 exhibits ca. 0.8 times lower charge storage capacity as compared to that under the dark condition. This is because the photoelectrons can be recombined with the generated holes in the conduction band. The charge storage mechanisms of Ag-doped α-Co(OH)2 operated under dark conditions and light irradiation were further studied and confirmed using in situ electrochemical X-ray absorption spectroscopy (XAS). Overall, the in situ XAS supports the electrochemical result. This finding may pave a way to further develop photoactive advanced functional materials of metal hydroxides and oxides.

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Photoactive Zn–air batteries using spinel-type cobalt oxide as a bifunctional photocatalyst at the air cathode

Abstract: Spinel-type cobalt oxide (Co3O4) was synthesized and used as a photoactive bifunctional electrocatalyst towards the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) at the air cathode of zinc–air batteries (ZABs).

Cited by 56 publications

References 26 publications

Rechargeable Photoactive Zn‐Air Batteries Using NiCo₂S₄ as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Rechargeable Photoactive Zn‐Air Batteries Using NiCo₂S₄ as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Integrated Photo‐Responsive Batteries for Solar Energy Harnessing: Recent Advances, Challenges, and Opportunities

Reducing the Energy Band Gap of Cobalt Hydroxide Nanosheets with Silver Atoms and Enhancing Their Electrical Conductivity with Silver Nanoparticles

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Photoactive Zn–air batteries using spinel-type cobalt oxide as a bifunctional photocatalyst at the air cathode

Abstract: Spinel-type cobalt oxide (Co3O4) was synthesized and used as a photoactive bifunctional electrocatalyst towards the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) at the air cathode of zinc–air batteries (ZABs).

Cited by 56 publications

References 26 publications

Rechargeable Photoactive Zn‐Air Batteries Using NiCo2S4 as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Rechargeable Photoactive Zn‐Air Batteries Using NiCo2S4 as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Integrated Photo‐Responsive Batteries for Solar Energy Harnessing: Recent Advances, Challenges, and Opportunities

Reducing the Energy Band Gap of Cobalt Hydroxide Nanosheets with Silver Atoms and Enhancing Their Electrical Conductivity with Silver Nanoparticles

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Rechargeable Photoactive Zn‐Air Batteries Using NiCo₂S₄ as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode

Rechargeable Photoactive Zn‐Air Batteries Using NiCo₂S₄ as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode