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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Novel Composite Based on Bimetallic AuNi-Embedded Nano X Zeolite/MWCNT as a Superior Electrocatalyst for Oxygen Evolution Reaction
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Novel Composite Based on Bimetallic AuNi-Embedded Nano X Zeolite/MWCNT as a Superior Electrocatalyst for Oxygen Evolution Reaction

机译：基于双金属AUNI嵌入式纳米X沸石/ MWCNT的新型复合材料作为氧气进化反应的优质电催化剂

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摘要

Herein, a novel and low-cost electrocatalyst based on AuNi bimetallic nanoparticles supported on nano X zeolite (AuNiNXZ) is prepared, and its electrocatalytic activity toward oxygen evolution reaction (OER) is studied. For this aim, nano X zeolite (NXZ) is first synthesized through a hydrothermal method using silica extracted from the agro waste stem sweep and then employed as a stabilizing matrix for AuNi bimetallic nanoparticles. The unique porous structure of NXZ is beneficial to suppress the aggregation of AuNi bimetallic nanoparticles and improve their performance in the catalytic process. Furthermore, the tendency for the promotion of OER catalytic activity is manifested by the incorporation of AuNiNXZ with multiwalled carbon nanotubes (MWCNTs). After optimization of AuNiNXZ and MWCNT contents in the carbon paste electrode (25 wt % AuNiNXZ and 25 wt % MWCNT), the catalyst with improved activity just needs a low overpotential of 210 mV at 10 mA cm~(-2) for OER, providing a small Tafel slope of 48 mV dec~(-1) and great stability during a 12 h period in a chronoamperometry test. The availability of more bimetallic active sites and good electrical conductivity of the catalyst are because of the presence of both NXZ and MWCNT, respectively, which account for its superior OER activity with excellent durability.
机译：在此，制备基于支持在纳米X沸石（AUNINXZ）上的AUNI双金属纳米颗粒的新型和低成本电催化剂，研究其对氧气进化反应（OER）的电催化活性。为此目的，首先通过使用从农业废物茎扫描中提取的二氧化硅的水热法合成纳米X沸石（NXZ），然后用作AUNI双金属纳米颗粒的稳定基质。 NXZ独特的多孔结构有益于抑制AUNI双金属纳米颗粒的聚集并改善其在催化过程中的性能。此外，通过掺入具有多壁碳纳米管（MWCNT）的AUNINXZ掺入oer催化活性的促进促进催化活性的趋势。在碳浆料电极（25wt％AUNINXZ和25wt％MWCNT）中优化AUNINXZ和MWCNT含量后，具有改善的活性的催化剂仅需要在10 mA cm〜（-2）下为210 mV的低过电位，为OER，提供48 mV DEC〜（-1）的小TAFEL斜率和在计时率测试的12小时内稳定性。更多双金属活性位点和催化剂的良好导电性的可用性分别是NXZ和MWCNT的存在，其占其优越的OER活性，其具有优异的耐久性。

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