H. 2. ‐induced thermal treatment significantly influences the development of a high performance low‐platinum core‐shell PtNi/C alloyed oxygen reduction catalyst
H. 2. ‐induced thermal treatment significantly influences the development of a high performance low‐platinum core‐shell PtNi/C alloyed oxygen reduction catalyst
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H.2.诱导热处理显着影响高性能低铂核壳PtNi/C合金氧还原催化剂的开发
DOI：
10.1002/er.5265
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发表时间：
2020
影响因子：
4.6
通讯作者：
Kazunari Sasaki
中科院分区：
文献类型：
--
作者：
Qing Zhao;Cheng Wang;Haifeng Wang;Jianlong Wang;Yaping Tang;Zongqiang Mao;Kazunari Sasaki
为了最大限度地利用贵金属Pt在氧还原催化剂中的作用，我们阐述了一种制备低铂PtNi/C合金氧还原反应（ORR）催化剂的合成方法，该催化剂是通过H2诱导处理葡萄糖还原的PtNi/C合金而开发的。该催化剂经H2/N2混合气体后处理后，由于合金化过程中电子效应和几何效应对催化剂的协同影响，显示出优异的ORR催化活性和耐久性。具体而言，所制备的PtNi/C（350°C-6 h）样品提供了优越的ORR活性，与商业Pt/C相比仅使用53.5%的Pt。比活度和质量活度分别是商品Pt/C的7.49倍和3.5倍。该催化剂在酸中经过10 000次潜在循环后表现出优异的ORR催化活性，这得益于PtNi/C的良好合金化核壳结构。H2诱导热处理对开发高性能低铂PtNi/C合金催化剂具有重要影响，并在形成良好合金化核壳结构方面发挥重要作用。降低的d带中心被认为通过减弱中间氧物质在合金化Pt表面上的吸附来促进ORR催化。因此，PtNi/C（350°C-6 h）合金催化剂具有优异的ORR催化活性，且Pt负载量低得多。
In the purpose of maximizing the utilization of noble metal Pt in oxygen reduction catalysts, we illustrate a synthesis method of preparing the low‐platinum PtNi/C alloyed oxygen reduction reaction (ORR) catalyst, which is developed through the H2‐induced treatment to a glucose reduced PtNi/C alloy. After post‐treatment with H2/N2mixture gases, this catalyst displays excellent ORR catalytic activity and durability for the synergetic influences of electronic and geometry effects on catalysts during the alloying. Specifically, the as‐prepared PtNi/C (350°C‐6 h) sample delivers preponderant ORR activity with only 53.5% Pt usage than the commercial Pt/C. The specific activity and mass activity are corresponding 7.49 times and 3.5 times to the commercial Pt/C. This catalyst exhibits excellent ORR catalytic activity after 10 000 potential cycles in acid, which benefits from the well alloyed core‐shell structure of PtNi/C. H2‐induced thermal treatment has significant effects on the development of high performance low‐platinum PtNi/C alloy catalyst, and plays the significant role in the formation of well‐alloyed core‐shell structures. The lowered d‐band center is believed to facilitate ORR catalysis through weakening the adsorption of intermediate oxygen species on the alloyed Pt surface. Therefore, PtNi/C(350°C‐6 h) alloyed catalyst possesses outstanding ORR catalytic activity with much lower Pt loading.