Capturing Visible Light in Low‐Band‐Gap C<sub>4</sub>N‐Derived Responsive Bifunctional Air Electrodes for Solar Energy Conversion and Storage

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  • Zhengsong Fang
    Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
  • Yuan Li
    Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
  • Jing Li
    Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
  • Chenhao Shu
    Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
  • Linfeng Zhong
    Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
  • Shaolin Lu
    Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
  • Chunshao Mo
    Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
  • Meijia Yang
    Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
  • Dingshan Yu
    Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Chemistry Sun Yat-Sen University Guangzhou 510275 China

抄録

<jats:title>Abstract</jats:title><jats:p>We report facile synthesis of low‐band‐gap mesoporous C<jats:sub>4</jats:sub>N particles and their use as responsive bifunctional oxygen catalysts for visible‐light‐sensitive (VLS) rechargeable Zn‐air battery (RZAB) and polymer‐air battery (RPAB). Compared to widely studied g‐C<jats:sub>3</jats:sub>N<jats:sub>4</jats:sub>, C<jats:sub>4</jats:sub>N shows a smaller band gap of 1.99 eV, with a larger photocurrent response, and it can function as visible‐light‐harvesting antenna and bifunctional oxygen reduction/evolution (ORR/OER) catalysts, enabling effective photocoupling to tune oxygen catalysis. The C<jats:sub>4</jats:sub>N‐enabled VLS‐RZAB displays a low charge voltage of 1.35 V under visible light, which is below the theoretical RZAB voltage of 1.65 V, corresponding to a high energy efficiency of 97.78 %. Pairing a C<jats:sub>4</jats:sub>N cathode with a polymer anode also endows an VLS‐RPAB with light‐boosted charge performance. It is revealed that the ORR and OER active sites in C<jats:sub>4</jats:sub>N are separate carbon sites near pyrazine‐nitrogen atoms and photogenerated energetic holes can activate OER for improved reaction kinetics.</jats:p>

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