新規太陽光照射型海水二次電池:光電気化学的エネルギー貯蔵と太陽光増強型海水からの自己給電型H₂O₂生成の統合
Fan Yang1, Yi Lin2, Xiaoqi Gong1
1Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Key Laboratory of High-Performance Polymer-Based Composites of Guangdong Province, GBRCE for Functional Molecular Engineering, School of Chemical Engineering and Technology, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, China.
Abstract:
Developing sustainable functional batteries capable of generating valuable chemicals during electricity storage/release represents challenging frontiers. Here, we present a new battery chemistry that enables the first value-added solar-mediated rechargeable seawater battery integrating photoelectrochemical energy storage with sunlight-boosted self-powered H2O2 production from seawater without external power/O2 supply. This system is enabled by rationally-designed bifunctional S-scheme heterojunction photocathodes (MP-COP@TiO2) comprising A3-(D-core) polymer (MP-COP) encapsulated TiO2. A3-(D-core) topology induces favorable electronic modulation that optimizes oxygen specie adsorption and steering oxygen reduction reaction (ORR) toward one-step 2e- pathway-while facilitating electronic coupling with oxygen evolution reaction (OER)-active TiO2 to establish S-scheme charge transfer mechanism alongside strengthened built-in electric field. These endow MP-COP@TiO2 with sunlight-boosted 4e- OER for in situ O2-generation during photo-charge and 2e- ORR for on-site H2O2 synthesis during photo-discharge, establishing solar-mediated self-sustaining value-added reaction cycles. Integrating MP-COP@TiO2 with sodium anodes and seawater creates previously-unexplored functional battery, yielding remarkable H2O2 yield of 5.47 mmol g-1 h-1 during photo-discharge-9.4 times those in dark and exceeding most reported seawater systems while delivering near-zero charge/discharge voltage gap under illumination. Mechanistic studies reveal promoting effect of A3-(D-core) modulation and its synergistic role with S-scheme charge transfer that promotes Yeager-type O2 adsorption and facilitates one-step 2e- ORR toward H2O2.
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