A Sustainable Synthesis of Nickel-Nitrogen-Carbon Catalysts for Efficient Electrochemical CO2 Reduction to CO
A Sustainable Synthesis of Nickel-Nitrogen-Carbon Catalysts for Efficient Electrochemical CO2 Reduction to CO
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DOI：
10.30919/esmm5f447
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
John E. Pellessier;Yang Gang;Ying Li
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文献类型：
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作者：
John E. Pellessier;Yang Gang;Ying Li
电化学CO 2 还原反应(CO 2 RR)是利用风能和太阳能等可再生能源将CO 2 转化为增值产品的一种有前景的方法。然而，传统的高性能CO 2 RR催化剂的合成方法通常会产生废物且不环保。在此，我们开发了一种可持续的催化剂合成方法，使用廉价、丰富的玉米淀粉作为原料，并用模拟含金属废水中的镍（Ni）掺杂，最后掺杂氮（N）以创建一种高效的金属-氮-碳（M-N-C）催化剂，该催化剂以单原子镍位点为主，无需酸洗后处理。与可逆氢电极（RHE）相比，基于玉米淀粉的催化剂在-0.8 V 电压下的 CO 电流密度为 11.6 mA/cm 2 时表现出高达 92% 的法拉第效率（FE）。在相同的Ni含量和测试条件下，传统湿法浸渍制备的催化剂的CO电流密度仅为9.3 mA/cm 2 ，而使用更昂贵的氧化石墨烯制备的催化剂的CO电流密度为11.5 mA/cm 2 ，但FE（CO）较低，为81%。这项工作的结果为使用低成本可持续生物材料和不产生废物的方法来生产有效的电化学 CO 2 RR 催化剂提供了见解。
The electrochemical CO 2 reduction reaction (CO 2 RR) is a promising approach of using renewable power sources such as wind and solar to convert CO 2 into value-added products. However, conventional methods of synthesizing high-performance CO 2 RR catalysts usually produce wastes and are not environmentally friendly. Herein, we developed a sustainable catalyst synthesis method by using cheap, abundant cornstarch as the feedstock, and doping it with nickel (Ni) from a simulated metal-containing wastewater, before finally doping it with nitrogen (N) to create a highly efficient metal-nitrogen-carbon (M-N-C) catalyst that is dominated by single atomic Ni sites without the need for an acid wash post-treatment. The cornstarch-based catalyst demonstrated a high faradaic efficiency (FE) of 92% for CO production with a CO current density of 11.6 mA/cm 2 at −0.8 V versus reversible hydrogen electrode (RHE). At the same Ni content under the same testing conditions, a catalyst prepared via conventional wet impregnation only attained a CO current density of 9.3 mA/cm 2 , and a catalyst prepared using more expensive graphene oxide achieved a CO current density of 11.5 mA/cm 2 but with a lower FE (CO) at 81%. Findings from this work provide insights into using low-cost sustainable biomaterials and non-waste producing methods to produce effective electrochemical CO 2 RR catalysts.