Key Laboratory of Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P. R. China.
State Key Laboratory of Pulp and Paper Engineering, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P. R. China.
Small. 2023 May;19(21):e2300019. doi: 10.1002/smll.202300019. Epub 2023 Feb 25.
Seawater electrolysis is a promising method to produce H without relying on scarce freshwater resource, but its high energy consumption and inevitable accompany of competitive chlorine oxidation reaction (ClOR) are still great technological challenges. Herein, a metal-organic framework (MOF)-templated pyrolysis strategy to prepare uniform cobalt/nitrogen-codoped carbon nanosheet arrays on carbon cloth (CC@CoNC) as highly-efficient but low-cost bifunctional electrocatalysts for hydrazine-assisted seawater electrolysis is explored. The optimized CoNC nanosheet arrays can be used as an efficient bifunctional electrocatalyst to catalyze hydrazine oxidation reaction and hydrogen evolution reaction, remarkably reducing the energy consumption and nicely overcome the undesired anodic corrosion problems caused by ClOR. Impressively, a hydrazine-assisted water electrolysis system is successfully assembled by using the optimized CC@CoNC as both cathode and anode, which only needs an ultra-low cell voltage of 0.557 V and an electricity consumption of 1.22 kW h per cubic meter of H to achieve 200 mA cm . Furthermore, the optimized CC@CoNC can also show greatly improved stability in the hydrazine-assisted seawater electrolysis system for H production, which can work steadily for above 40 h at ≈10 mA cm . This study may offer great opportunities for obtaining hydrogen energy from infinite ocean resource by an eco-friendly method.
海水电解是一种有前途的生产 H 的方法，无需依赖稀缺的淡水资源，但它的高能耗和不可避免的伴随的竞争氯氧化反应（ClOR）仍然是巨大的技术挑战。在此，我们探索了一种金属有机骨架（MOF）模板热解法，以在碳布（CC@CoNC）上制备均匀的钴/氮共掺杂碳纳米片阵列作为高效但低成本的肼辅助海水电解双功能电催化剂。优化后的 CoNC 纳米片阵列可用作高效双功能电催化剂，可催化水合肼氧化反应和析氢反应，显著降低能耗，并很好地克服了 ClOR 引起的阳极腐蚀问题。令人印象深刻的是，通过使用优化的 CC@CoNC 作为阴极和阳极，成功组装了肼辅助水电解系统，仅需要超低的电池电压 0.557 V 和 1.22 kW h 每立方米 H 的电能即可达到 200 mA cm 。此外，优化的 CC@CoNC 在肼辅助海水电解制氢系统中也表现出了大大提高的稳定性，可在 ≈10 mA cm 下稳定运行超过 40 小时。这项研究为通过环保的方法从无限的海洋资源中获取氢能提供了很好的机会。
