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Tungsten‐Doping‐Induced Surface Reconstruction of Porous Ternary Pt‐Based Alloy Electrocatalyst for Oxygen Reduction
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-01-04 , DOI: 10.1002/adfm.201807070 Wenzhe Tu 1, 2 , Kai Chen 2 , Lujun Zhu 3 , Huachao Zai 1 , Bin E 2 , Xiaoxing Ke 3 , Changfeng Chen 2 , Manling Sui 3 , Qi Chen 1 , Yujing Li 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-01-04 , DOI: 10.1002/adfm.201807070 Wenzhe Tu 1, 2 , Kai Chen 2 , Lujun Zhu 3 , Huachao Zai 1 , Bin E 2 , Xiaoxing Ke 3 , Changfeng Chen 2 , Manling Sui 3 , Qi Chen 1 , Yujing Li 1
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Surface engineering has been found to be effective in promoting the catalytic activities of noble‐metal‐based nanocatalysts. In this contribution, by using the PtCuxNi ternary alloy nanocrystal (NC) as the model catalyst, a surface tungsten(W)‐doping strategy, combining a surface oxidative acid treatment protocol, can effectively boost the electrocatalytic activities of the NCs in oxygen reduction reaction. The W‐doped PtCuxNi alloy catalysts show obvious enhancement in electrochemical surface area and mass activity and slightly enhanced specific activity compared with the undoped catalyst. Based on the experimental evidence, it is proposed that the W doping involves a surface reconstruction by first removing the surface Pt atoms from the NC and then reducing them back to the surface. The existence of surface Ni atoms may be crucial in promoting the catalytic activities possibly through their electronic interactions to the active sites. The durability of the W‐doped PtCuxNi catalysts is also enhanced possibly due to the pinning effect of surface W atoms. Therefore, the surface engineering of PtCuxNi ternary alloy by W atoms can effectively modulate its activity and durability.
中文翻译：
钨掺杂的多孔三元铂基合金电催化剂的表面还原氧
已经发现表面工程可以有效地提高贵金属基纳米催化剂的催化活性。在这一贡献中，通过使用PtCu x Ni三元合金纳米晶体（NC）作为模型催化剂，表面钨（W）掺杂策略结合了表面氧化酸处理方案，可以有效地提高NCs在氧气中的电催化活性。还原反应。掺W的PtCu x与未掺杂的催化剂相比，Ni合金催化剂在电化学表面积和质量活性上显示出明显的增强，并且比活性略有增强。基于实验证据，提出W掺杂涉及通过首先从NC去除表面Pt原子然后将其还原回到表面来进行表面重构。表面镍原子的存在可能对促进催化活性至关重要，可能通过它们与活性位的电子相互作用来实现。掺W的PtCu x Ni催化剂的耐久性也可能由于表面W原子的钉扎效应而得到增强。因此，利用W原子对PtCu x Ni三元合金进行表面工程处理可以有效地调节其活性和耐久性。
更新日期：2019-01-04
中文翻译：
钨掺杂的多孔三元铂基合金电催化剂的表面还原氧
已经发现表面工程可以有效地提高贵金属基纳米催化剂的催化活性。在这一贡献中，通过使用PtCu x Ni三元合金纳米晶体（NC）作为模型催化剂，表面钨（W）掺杂策略结合了表面氧化酸处理方案，可以有效地提高NCs在氧气中的电催化活性。还原反应。掺W的PtCu x与未掺杂的催化剂相比，Ni合金催化剂在电化学表面积和质量活性上显示出明显的增强，并且比活性略有增强。基于实验证据，提出W掺杂涉及通过首先从NC去除表面Pt原子然后将其还原回到表面来进行表面重构。表面镍原子的存在可能对促进催化活性至关重要，可能通过它们与活性位的电子相互作用来实现。掺W的PtCu x Ni催化剂的耐久性也可能由于表面W原子的钉扎效应而得到增强。因此，利用W原子对PtCu x Ni三元合金进行表面工程处理可以有效地调节其活性和耐久性。
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