Trifunctional robust electrocatalysts based on 3D Fe/N-doped carbon nanocubes encapsulating Co4N nanoparticles for efficient battery-powered water electrolyzers,Carbon Energy

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Trifunctional robust electrocatalysts based on 3D Fe/N-doped carbon nanocubes encapsulating Co4N nanoparticles for efficient battery-powered water electrolyzers
Carbon Energy ( IF 20.5 ) Pub Date : 2024-02-15 , DOI: 10.1002/cey2.505
Hyung Wook Choi ₁ , Hongdae Lee ₂ , Jun Lu ₂ , Seok Bin Kwon ₃ , Dong In Jeong ₃ , Beum Jin Park ₂ , Jiwon Kim ₃ , Bong Kyun Kang ₄ , Gun Jang ₂ , Dae Ho Yoon _{1,

3} , Ho Seok Park _{1,

2,

5,

6}

Affiliation

Herein, we have designed a highly active and robust trifunctional electrocatalyst derived from Prussian blue analogs, where Co₄N nanoparticles are encapsulated by Fe embedded in N-doped carbon nanocubes to synthesize hierarchically structured Co₄N@Fe/N–C for rechargeable zinc–air batteries and overall water-splitting electrolyzers. As confirmed by theoretical and experimental results, the high intrinsic oxygen reduction reaction, oxygen evolution reaction, and hydrogen evolution reaction activities of Co₄N@Fe/N–C were attributed to the formation of the heterointerface and the modulated local electronic structure. Moreover, Co₄N@Fe/N–C induced improvement in these trifunctional electrocatalytic activities owing to the hierarchical hollow nanocube structure, uniform distribution of Co₄N, and conductive encapsulation by Fe/N–C. Thus, the rechargeable zinc–air battery with Co₄N@Fe/N–C delivers a high specific capacity of 789.9 mAh g⁻¹ and stable voltage profiles over 500 cycles. Furthermore, the overall water electrolyzer with Co₄N@Fe/N–C achieved better durability and rate performance than that with the Pt/C and IrO₂ catalysts, delivering a high Faradaic efficiency of 96.4%. Along with the great potential of the integrated water electrolyzer powered by a zinc–air battery for practical applications, therefore, the mechanistic understanding and active site identification provide valuable insights into the rational design of advanced multifunctional electrocatalysts for energy storage and conversion.

更新日期：2024-02-17

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