Bi2O3 Nanosheets Grown on Multi-Channel Carbon Matrix to Catalyze Efficient CO2 Electroreduction to HCOOH
Bi2O3 Nanosheets Grown on Multi-Channel Carbon Matrix to Catalyze Efficient CO2 Electroreduction to HCOOH
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DOI：
10.1002/anie.201907674
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发表时间：
2019-08-16
影响因子：
16.6
通讯作者：
Lou, Xiong Wen (David)
中科院分区：
文献类型：
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作者：
Liu, Subiao;Lu, Xue Feng;Lou, Xiong Wen (David)
Bi 2 O3纳米片生长在导电的多通道碳基质（MCCM）的CO2 RR。所获得的电催化剂显示出约为0.001的期望的部分电流密度。17.7 mA cm（-2），并且它对HCOOH的形成具有高度选择性，在宽的电位窗口内法拉第效率接近90%，在-1.256 V下其最大值为93.8%。它还表现出在0.846 V的过电位下的最大能量效率为55.3%，并且长期稳定性为12 h，降解可忽略不计。这种上级性能的产生是由于MCCM和Bi 2 O3纳米片的协同作用，MCCM提供了加速的电子传递、增加的CO2吸附和高的吡咯-N和吡啶-N的比例，而Bi 2 O3纳米片提供了丰富的活性位点、降低的接触电阻和功函数以及缩短的电解质扩散路径。
Bi2O3 nanosheets were grown on a conductive multiple channel carbon matrix (MCCM) for CO2RR. The obtained electrocatalyst shows a desirable partial current density of ca. 17.7 mA cm(-2) at a moderate overpotential, and it is highly selective towards HCOOH formation with Faradaic efficiency approaching 90 % in a wide potential window and its maximum value of 93.8 % at -1.256 V. It also exhibits a maximum energy efficiency of 55.3 % at an overpotential of 0.846 V and long-term stability of 12 h with negligible degradation. The superior performance is attributed to the synergistic contribution of the interwoven MCCM and the hierarchical Bi2O3 nanosheets, where the MCCM provides an accelerated electron transfer, increased CO2 adsorption, and a high ratio of pyrrolic-N and pyridinic-N, while ultrathin Bi2O3 nanosheets offer abundant active sites, lowered contact resistance and work function as well as a shortened diffusion pathway for electrolyte.