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Hierarchical Chestnut
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Uniquely nanostructured CuCo2O4 is presented as an electrocatalyst for oxygen evolution reactions (OER). CuCo2O4 particles in a chestnut-burr-like shape (CCO*, where ∗ = chestnut burr) were hydrothermally synthesized around fibers of Ni foam substrates as current collectors. Chestnut burrs 4 μm on average had thorns consisting of less than five threads. Each thread was made of a consecutive array of nanobeads less than 10 nm. Nanovoids or nanopores were found between nanobeads. The chestnut-burr structure of CCO* allowed IrO2-overwhelming OER activity. By using the hierarchically nanostructured electrocatalyst directly grown on current collectors without binders and conducting agents, high performances of anion exchange membrane (AEM) electrolysis was demonstrated. Three merits of the electrode architecture were emphasized. First, mass transfer pathways for reactants and products were secured in a microscale between thorns and in a nanoscale between nanobeads. Second, more active sites were exposed to electrolytes in the hierarchical structure. Third, direct growth of active materials on conductive substrates improved adhesion and electrical conduction.
中文翻译：
提出了独特的纳米结构CuCo 2 O 4作为氧释放反应（OER）的电催化剂。板栗毛刺状的CuCo 2 O 4颗粒（CCO *，其中* =板栗毛刺）在集电体Ni泡沫基材的纤维周围水热合成。板栗毛刺平均4μm，刺数少于5条。每条线由连续的小于10 nm的纳米珠阵列制成。在纳米珠之间发现了纳米空隙或纳米孔。CCO *的栗子毛刺结构允许IrO 2-压倒性的OER活动。通过使用直接在没有粘合剂和导电剂的集电器上生长的分层纳米结构电催化剂，证明了高性能的阴离子交换膜（AEM）电解。强调了电极结构的三个优点。首先，在刺之间的微尺度和纳米珠之间的纳米尺度确保了反应物和产物的传质路径。第二，更多的活性位点暴露于分层结构的电解质中。第三，活性材料在导电基底上的直接生长改善了粘附性和导电性。 |
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