Acta Chimica Sinica ›› 2022, Vol. 80 ›› Issue (6): 703-707.DOI: 10.6023/A22010012 Previous Articles     Next Articles

Special Issue: 中国科学院青年创新促进会合辑

Communication

富晶格位错的多孔铋纳米花高效电还原二氧化碳制甲酸盐

蒋银龙a,b, 李国超a,b, 陈青松b,*(), 徐忠宁b, 林姗姗a,b, 郭国聪b,*()   

  1. a 福州大学化学学院 福州 350116
    b 中国科学院福建物质结构研究所结构化学国家重点实验室 福州 350002
  • 投稿日期:2022-01-06 发布日期:2022-07-07
  • 通讯作者: 陈青松, 郭国聪
  • 作者简介:
    庆祝中国科学院青年创新促进会十年华诞.
  • 基金资助:
    国家重点研发计划项目(2017YFA0206802); 国家重点研发计划项目(2017YFA0700103); 国家自然科学基金(21203200); 国家自然科学基金(91545201)

Porous Bismuth Nanoflowers Enriched with Lattice Dislocations for Highly Efficient Electrocatalytic Reduction of Carbon Dioxide to Formate

Yinlong Jianga,b, Guochao Lia,b, Qingsong Chenb(), Zhongning Xub, Shanshan Lina,b, Guocong Guob()   

  1. a College of Chemistry, Fuzhou University, Fuzhou 350116, China
    b State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
  • Received:2022-01-06 Published:2022-07-07
  • Contact: Qingsong Chen, Guocong Guo
  • About author:
    Dedicated to the 10th anniversary of the Youth Innovation Promotion Association, CAS.
  • Supported by:
    National Key R&D Program of China(2017YFA0206802); National Key R&D Program of China(2017YFA0700103); National Natural Science Foundation of China(21203200); National Natural Science Foundation of China(91545201)

The conversion of carbon dioxide has become a hot topic in the world today. Here, we adopt the strategy of in-situ electrochemical transformation to reduce layered bismuth oxide formate nanoflowers (BiOCOOH NFs) self-assembled with nanosheets synthesized by simple solvothermal method to porous bismuth nanoflowers (p-Bi NFs) with a large number of lattice dislocations. Specifically, 1.0 g Bi(NO3)3•5H2O was ultrasonically dissolved in 10 mL N,N-dimethylformamide (DMF), then 70 mL deionized water was added to the above solution, and the resulting solution was ultrasonicated for 10 min at room temperature to ensure that all reagents were uniformly dispersed. The resulting solution was then transferred to a 100 mL Teflon-lined stainless steel autoclave, kept at 120 ℃ for 20 h, and then naturally cooled to room temperature. The results show that the minimum overpotential of the electrochemical reduction of carbon dioxide to formate is 436 mV. When the catalyst loading is 0.5 mg/cm2, the partial current density of formate (jformate) is as high as 24.4 mA•cm-2, which is 5.5 times that of commercial bismuth (Commercial Bi); and the Faraday efficiency (FEformate) of formate is 96.7% at –1.8 V versus saturated calomel electrode (vs. SCE). The FEformate is over 90% in a wide potential window of over 500 mV. Moreover, the p-Bi NFs electrocatalyst is stable in formate production for more than 10 h in CO2-saturated 0.5 mol•L-1 KHCO3 electrolyte. Compared with the normalized electrochemical surface area (ECSA), it was found that the jformate of p-Bi NFs was still about 4.5 times higher than that of Commercial Bi. The high catalytic performance of the catalyst can be attributed to the unique micro/nano hybrid structure derived from the lattice collapse and reconstruction of precursors, resulting in porous and rough surface and containing high density of active sites with lattice dislocations and defects. This study provides new insights into designing and synthesizing electrocatalysts with high performance for carbon dioxide reduction to formate.

Key words: bismuth, electrocatalysis, carbon dioxide, formate, lattice dislocation