Heterostructured intermetallic CuSn catalysts: high performance towards the electrochemical reduction of CO2 to formate†,Journal of Materials Chemistry A

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Heterostructured intermetallic CuSn catalysts: high performance towards the electrochemical reduction of CO2 to formate†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-11-22 , DOI: 10.1039/c9ta11140a
Jigang Wang _{1,

2,

3,

4,

5} , Jiasui Zou _{1,

2,

3,

4,

5} , Xiao Hu _{1,

2,

3,

4,

5} , Shunlian Ning _{1,

2,

3,

4,

5} , Xiujun Wang _{3,

6,

7,

8} , Xiongwu Kang _{1,

2,

3,

4,

5} , Shaowei Chen _{9,

10,

11,

12}

Affiliation

Electroreduction of carbon dioxide (CO₂RR) into fuels and chemicals is an appealing approach to tackle CO₂ emission challenges. To this end, it is critical to develop highly efficient and selective electrocatalysts for the CO₂RR. Herein, we report a simple strategy for the preparation of heterostructured intermetallic CuSn electrocatalysts (Cu₃Sn/Cu₆Sn₅) supported on porous copper foam through an electrodeposition–calcination process. The obtained CuSn intermetallic catalysts demonstrate a faradaic efficiency of 82% and a current density of 18.9 mA cm⁻² at −1.0 V vs. the reversible hydrogen electrode for formate production in 0.1 M NaHCO₃ electrolyte for as long as 42 h. By using a gas diffusion electrode and 1 M KOH electrolyte, the current density of this catalyst for formic acid production can reach values as high as 148 mA cm⁻². Density functional theory calculations show that the moderate Gibbs free energy of hydrogen adsorption on the heterostructured Cu₃Sn/Cu₆Sn₅ catalysts not only suppresses hydrogen evolution, but also favors the production of formic acid. This study demonstrates a straightforward approach to the preparation of high-performance electrocatalysts towards the selective electroreduction of CO₂ to formate.

中文翻译：

异质结构金属间化合物CuSn催化剂：高性能，可将CO ₂电化学还原成甲酸酯†

将二氧化碳（CO ₂ RR）电还原为燃料和化学品是解决CO ₂排放挑战的一种有吸引力的方法。为此，开发用于CO ₂ RR的高效且选择性的电催化剂至关重要。本文中，我们报告了一种通过电沉积-煅烧工艺制备负载在多孔泡沫铜上的异质结构金属间CuSn电催化剂（Cu ₃ Sn / Cu ₆ Sn ₅）的简单策略。将所得的CuSn金属间催化剂表明82％的法拉第效率和18.9毫安cm 2的电流密度^-2在的-1.0V与在0.1 M NaHCO ₃电解液中甲酸生成的可逆氢电极长达42 h。通过使用气体扩散电极和1M KOH电解质，该用于甲酸生产的催化剂的电流密度可以达到高达148mA cm ^-2的值。密度泛函理论计算表明，异结构Cu ₃ Sn / Cu ₆ Sn ₅催化剂上适度的氢吸附吉布斯自由能不仅抑制氢的释放，而且有利于甲酸的产生。这项研究证明了一种直接制备高性能电催化剂的方法，可以选择性地将CO ₂电还原为甲酸。

更新日期：2019-12-11

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