Dealloying-Derived Nanoporous Bismuth for Selective CO2 Electroreduction to Formate
Dealloying-Derived Nanoporous Bismuth for Selective CO2 Electroreduction to Formate
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脱合金衍生的纳米多孔铋用于选择性 CO2 电还原生成甲酸盐
DOI：
10.1021/acs.jpclett.2c02570
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Zhonghua Zhang
中科院分区：
文献类型：
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作者：
Qingru Wei;Jingyu Qin;Guixing Jia;Yong Zhao;Zhiyuan Guo;Guanhua Cheng;Wensheng Ma;Wanfeng Yang;Zhonghua Zhang
电化学二氧化碳还原 (CO2ER) 生成甲酸盐是一种颇具吸引力的二氧化碳利用方法。在这里，我们报道了一种通过对快速凝固的 Mg92Bi8 合金进行化学脱合金而制备的纳米多孔铋 (np-Bi) 催化剂，用于 CO2ER。 np-Bi催化剂呈现出三维互连的韧带通道网络结构，可以有效地将CO2转化为甲酸盐，选择性≤94%，在较宽的电位范围内活性为62 mA cm-2。值得注意的是，np-Bi 催化剂在流通池中以 420 mV 的低过电势生产甲酸盐，可提供约 500 mA cm-2 的工业级电流密度。出色的 CO2ER 性能可归因于具有丰富的可接近活性位点的扩大的表面积和具有增强的内在活性的高度弯曲的表面。这项工作强调了增强 CO2ER 的结构协同作用。
Electrochemical CO2reduction (CO2ER) to formate is an attractive approach for CO2utilization. Here, we report a nanoporous bismuth (np-Bi) catalyst fabricated by chemically dealloying a rapidly solidified Mg92Bi8alloy for CO2ER. The np-Bi catalyst exhibits a three-dimensional interconnected ligament-channel network structure, which can efficiently convert CO2to formate with a selectivity of ≤94% and an activity of 62 mA cm–2in a wide potential range. Remarkably, the np-Bi catalyst delivers an industry-level current density of ∼500 mA cm–2for formate production at a low overpotential of 420 mV in the flow cell. The outstanding CO2ER performance can be attributed to the enlarged surface area with abundant accessible active sites and highly curved surfaces with enhanced intrinsic activity. This work highlights the structural synergies for enhancing CO2ER.