Hydrogen peroxide (H2O2) in water has been proposed as a promising solar fuel instead of gaseous hydrogen because of advantages on easy storage and high energy density, being used as a fuel of a one-compartment H2O2 fuel cell for producing electricity on demand with emitting only dioxygen (O2) and water. It is highly desired to utilize the most earth-abundant seawater instead of precious pure water for the practical use of H2O2 as a solar fuel. Here we have achieved efficient photocatalytic production of H2O2 from the most earth-abundant seawater instead of precious pure water and O2 in a two-compartment photoelectrochemical cell using WO3 as a photocatalyst for water oxidation and a cobalt complex supported on a glassy-carbon substrate for the selective two-electron reduction of O2. The concentration of H2O2 produced in seawater reached 48 mM, which was high enough to operate an H2O2 fuel cell.

中文翻译：

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可用于生产和消费过氧化氢作为太阳能的海水。

水中的过氧化氢（H2O2）具有易于储存和高能量密度的优点，已被提议作为一种有前途的太阳能燃料代替气态氢，被用作单室H2O2燃料电池的燃料，用于随需发电并排放只有氧气（O2）和水。对于将H 2 O 2作为太阳能燃料的实际用途，非常需要利用地球上最丰富的海水代替珍贵的纯净水。在这里，我们在两室的光电化学电池中使用WO3作为水氧化的光催化剂，并将钴配合物负载在玻璃碳基底上，从而从最富地球的海水中高效地光催化生产H2O2，而不是珍贵的纯净水和O2。 O 2的选择性两电子还原。海水中产生的H2O2浓度达到48 mM，