Liang Shuaika, Ma Yuanyuan, Luo Hongxia, Wu Kangxi, Chen Jun, Yang Jianping
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
Engineering Research Center of Advanced Glass Manufacturing Technology, Ministry of Education, Donghua University, Shanghai, 201620, China.
Chemistry. 2023 Oct 2;29(55):e202302160. doi: 10.1002/chem.202302160. Epub 2023 Aug 25.
Water electrolysis has been considered a promising technology for the conversion of renewables to hydrogen. However, preventing mixing of products (H and O ) and exploring cost-efficient electrolysis components remains challenging for conventional water electrolyzers. Herein, we designed a membrane-free decoupled water electrolysis system by using graphite felt supported nickel-cobalt phosphate (GF@Ni Co -P) material as a tri-functional (redox mediator, hydrogen evolution reaction (HER), oxygen evolution reaction (OER)) electrode. The versatile GF@Ni Co -P electrode obtained by a one-step electrodeposition not only exhibits high specific capacity (176 mAh g at 0.5 A g ) and long cycle life (80 % capacity retention after 3000 cycles) as a redox mediator, but also has relatively outstanding catalytic activities for HER and OER. The excellent properties of the GF@Ni Co -P electrode endow this decoupled system with more flexibility for H production by fluctuating renewable energies. This work provides guidance for multifunctional applications of transition metal compounds between energy storage and electrocatalysis.
水电解被认为是一种将可再生能源转化为氢气的很有前景的技术。然而，对于传统水电解槽而言，防止产物（氢气和氧气）混合以及探索具有成本效益的电解组件仍然具有挑战性。在此，我们设计了一种无膜解耦水电解系统，该系统使用石墨毡负载的磷酸镍钴（GF@NiCo-P）材料作为三功能（氧化还原介质、析氢反应（HER）、析氧反应（OER））电极。通过一步电沉积获得的多功能GF@NiCo-P电极，不仅作为氧化还原介质表现出高比容量（在0.5 A g下为176 mAh g）和长循环寿命（3000次循环后容量保持率为80%），而且对HER和OER具有相对出色的催化活性。GF@NiCo-P电极的优异性能赋予该解耦系统在利用波动的可再生能源制氢方面更大的灵活性。这项工作为过渡金属化合物在能量存储和电催化之间的多功能应用提供了指导。
