FeNi层状双氢氧化物纳米片具有固有的高水氧化催化活性,ACS Applied Energy Materials

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FeNi层状双氢氧化物纳米片具有固有的高水氧化催化活性
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-08-19 , DOI: 10.1021/acsaem.0c01439
Manabu Ishizaki ₁ , Hiroya Tanno ₁ , Hikaru Sutoh ₁ , Tomohiro Katsuki ₂ , Taichi Hayasaka ₂ , Masayuki Yagi ₂ , Yuta Tsubonouchi ₂ , Kazuki Tajima ₃ , Tohru Kawamoto ₃ , Yusuke Sakuda ₄ , Masato Kurihara ₁

Affiliation

气体扩散碳纸（CP）电极上的氧演化反应（OER）和氧还原反应（ORR）催化剂已成为当前的热门话题。低成本且富含地球的FeNi（羟基）氢氧化物有可能成为性能最佳的OER催化剂系列。在这里，我们报道了富铁的FeNi层状双氢氧化物（LDH）纳米片（Fe / Ni = 1：1.5 mol / mol），其片状尺寸为10–20 nm，并带有增加的OER活性位。FeNi普鲁士蓝类似物纳米粒子（PBA NPs）的水分散溶液滴铸在CP上，系统地控制了它们的金属组成和微克级质量负载量。将PBA NP在碱性水溶液中转化为LDH纳米薄片。据我们所知，与先前报道的催化剂相比，^–1）和在300 mV的低超电势下的转换频率（1.58 s ^–1）和质量活度（10 600 A g ^–1）的最大值。滴涂的Mn ²⁺离子显着增强了CP的固有ORR活性。独立优化的OER和ORR催化剂与双功能对组合在同一张CP上。

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FeNi-Layered Double-Hydroxide Nanoflakes with Potential for Intrinsically High Water-Oxidation Catalytic Activity

Oxygen-evolution-reaction (OER) and oxygen-reduction-reaction (ORR) catalysts on a gas-diffusion carbon paper (CP) electrode have been explored as a current hot topic. Low-cost and earth-abundant FeNi (oxy)hydroxides have the potential to be the best-performing OER catalyst families. Here, we report on Fe-rich FeNi-layered double-hydroxide (LDH) nanoflakes (Fe/Ni = 1:1.5 mol/mol) with a sheet dimension of 10–20 nm and bearing an increased number of OER-active sites. An aqueous dispersion solution of FeNi Prussian blue analog nanoparticles (PBA NPs) is drop-cast on CP, and their metal compositions and microgram-scale mass-loading amounts are systematically controlled. The PBA NPs are transformed into LDH nanoflakes in an alkaline aqueous solution. To the best of our knowledge, compared to the previously reported catalysts, the LDH nanoflakes intrinsically show potential comparable to that of catalysts with the highest activity, based on the lowest Tafel slope (15.1 mV dec^–1) and the highest values of turnover frequency (1.58 s^–1) and mass activity (10 600 A g^–1) at a low overpotential of 300 mV. Drop-coated Mn²⁺ ions significantly enhance the intrinsic ORR activity of CP. The independently optimized OER and ORR catalysts are united on the same sheet of CP as a bifunctional pair.

更新日期：2020-09-28

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