A Photorechargeable Metal Hydride/Air Battery

Akuto, Keiji; Sakurai, Yasuhisa

doi:10.1149/1.1339867

Cited by 34 publications

(19 citation statements)

References 13 publications

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“…Consequently, the different energy conversion and storage parts do not match ideally for an effi cient electron transfer. Polymer electrolyte bilayer fi lm with photo-rechargeable characteristics Layer consists of anionically conducting fi lm n/a [74] Photo-rechargeable metal air battery Anthraquinone containing polymers as active anode material, MnO 2 /carbon composite as cathode material η storage = 62 to 72% [76] Catalytic cathode and a photoanode with SrTiO 3 n/a [77] Furthermore, geometrical restrictions limit the effi ciency of the devices.…”

Section: Resultsmentioning

confidence: 99%

Photo‐Rechargeable Electric Energy Storage Systems

Schmidt

Hager

Schubert

2015

Advanced Energy Materials

173

131

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use of solar energy, e.g., solar collectors, and concentrated solar thermal systems, as well as solar cells. Due to increasing manufacturing capacities and lower costs, the installed capacities of solar cells has grown massively in recent years. In 2012, the capacity of installed solar cells rose over the level of 100 GW worldwide. [ 10 ] The major drawback of solar power is that electricity generation is directly coupled to the availability of the sun (e.g., day and night, weather). This dependence of solar energy does not comply with the actual energy demand and requires a solution. The key technology is the combination of solar cells and effective energy storage systems, e.g., batteries or supercapacitors, to create independent electrical energy sources. [ 8,[11][12][13][14][15] Usually, the generated photovoltaic energy is stored by external batteries (e.g., Li ion or nickel/metal hydride batteries), which are directly connected to the solar cells by wires. [ 13,16,17 ] As a consequence, the relatively long distance between both parts lowers the energy storage effi ciency. [ 13 ] One approach to avoid this problem is the integration of the photo conversion system and the energy storage part within one device, for an effective storage of the excess energy. [ 6,18 ] The stored energy can be released and used throughout the day, and at different places, even if the sun is not shining. [ 18,19 ] Different possibilities for storing large amounts of energy are available, e.g., pumped hydroelectric energy storage or compressed air energy storage as large-scale, centralized systems. [ 19 ] Moreover, photo generated electricity can be stored as chemical energy. The best known system for conversion and storage of solar energy as chemical energy is the photosynthesis of plants, algae and bacteria, in which organic material and oxygen are generated by water and carbon dioxide under sunlight illumination. [ 20 ] Water splitting represents an artifi cial way, [ 19,21 ] where hydrogen and oxygen are produced by utilization of photo catalysts [ 22 ] or semiconducting electrodes. [ 23 ] Photo-electrochemical energy can be effi ciently stored by using two vanadium based redox couples. [ 24 ] Other possibilities for storage of solar energy are molecular energy storage systems, where new chemical bonds are formed; phase change materials, where the energy is stored as thermal energy; as well as electrochemical storage systems. [ 20,25 ] Many types of electrochemical storage applications such as rechargeable batteries (e.g., lithium ion batteries, hightemperature sodium batteries, or lead acid batteries), organic radical batteries, redox fl ow batteries, as well as electrochemical supercapacitors are available. [ 4,19,26 ] A solar rechargeable battery uses the solar light to generate electric energy, which is directly stored by an integrated storage The global energy demand is increasing at the same time as fossil fuel resources are dwindling. Consequently, the search for alternative energy sources is a major topic worldwide. Sol...

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Section: Resultsmentioning

confidence: 99%

Photo‐Rechargeable Electric Energy Storage Systems

Schmidt

Hager

Schubert

2015

Advanced Energy Materials

173

131

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“…Interestingly, photo‐responsive behavior could also be introduced into the anode for the air‐based battery, which integrated with a traditional air cathode. There are several attractive studies have been reported to demonstrate the concept to date . In 2001, Akuto et al.…”

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

confidence: 99%

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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“…To construct this type of novel bi-functional FCB system, the electrode materials are required to possess the following characteristics: (i) the negative electrode materials should be reduced by hydrogen gas (gaseous charging) and be oxidized during electrochemical reactions and (ii) the positive electrode materials should be oxidized by oxygen gas (gaseous charging) and be able to be reduced electrochemically [8]. Metal hydrides (MHs) are well suited for the negative electrode of the FCB system because they adsorb gaseous hydrogen [7,[10][11][12][13][14][15][16] and have been used as active materials in NiMH secondary batteries [15][16][17][18][19][20][21] as well as in air-metal batteries [11,[22][23]. It has been reported that MH can be rapidly charged to more than 70% of its theoretical capacity within 10 min by pressurized (0.3 and 0.5 MPa) gaseous hydrogen and that the charged MH can be electrochemically discharged by the reactions shown below [7]:…”

Section: Introductionmentioning

confidence: 99%