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首页> 外文期刊>RSC Advances >Stabilization of platinum-nickel alloy nanoparticles with a sulfur-doped graphene support in polymer electrolyte membrane fuel cells
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Stabilization of platinum-nickel alloy nanoparticles with a sulfur-doped graphene support in polymer electrolyte membrane fuel cells

机译：含硫掺杂石墨烯载体的铂镍合金纳米粒子在聚合物电解质膜燃料电池中的稳定化

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Polymer electrolyte membrane fuel cells (PEMFC) are limited by the sluggish oxygen reduction reaction (ORR) at the cathode, necessitating the use of platinum-based catalysts for practical use. However, such catalysts suffer from degradation issues related to the catalyst and the support material that prevent prolonged operation. Sulfur-doped graphene (SG) as a catalyst support material promises high durability with pure Pt, but its contribution to lattice-strained Pt as in bimetallic alloys has not yet been determined. In this work, platinum-nickel alloy nanoparticles with SG are synthesized (denoted as Pt-Ni/SG), then chemically dealloyed (denoted as Pt-Ni/SG-DA) and finally subjected to a post heat treatment (denoted as Pt-Ni/SG-PHT). The prepared catalysts Pt-Ni/SG, Pt-Ni/SG-DA and Pt-Ni/SG-PHT are physically characterized and electrochemically tested in half-cell conditions. Pt-Ni/SG-PHT is found to be superior, exhibiting the highest ECSA and mass activity retention with losses of 27 and 28% respectively after 1500 cycles from 0.05 to 1.3 V vs. RHE in HClO4. This is compared to a 59% ECSA loss and 69% activity loss for commercial Pt/C under the same conditions. Hence, the strong interaction between the metal particles and sulfur-doped graphene resulting from the annealing process as in Pt-Ni/SG-PHT yields a highly stable electrocatalyst for the ORR.
机译：聚合物电解质膜燃料电池（PEMFC）受阴极反应迟缓的氧还原反应（ORR）的限制，因此有必要在实际应用中使用铂基催化剂。然而，这种催化剂遭受与防止延长操作的催化剂和载体材料有关的降解问题。掺杂硫的石墨烯（SG）作为催化剂载体材料有望在纯Pt的情况下具有很高的耐久性，但尚未确定其对双金属合金中晶格应变Pt的贡献。在这项工作中，合成了具有SG的铂-镍合金纳米颗粒（表示为Pt-Ni / SG），然后进行化学脱合金处理（表示为Pt-Ni / SG-DA），最后进行后热处理（表示为Pt-Ni / SG-DA）。 Ni / SG-PHT）。在半电池条件下对制备的催化剂Pt-Ni / SG，Pt-Ni / SG-DA和Pt-Ni / SG-PHT进行了物理表征和电化学测试。发现Pt-Ni / SG-PHT具有更好的表现，相对于RHE在HClO4中的表现，在0.05至1.3 V的1500次循环后，具有最高的ECSA和质量活性保留率，分别损失27％和28％。与之相比，在相同条件下，商用Pt / C的ECSA损失为59％，活性损失为69％。因此，如Pt-Ni / SG-PHT中那样，由退火过程导致的金属颗粒与掺杂硫的石墨烯之间的强相互作用产生了用于ORR的高度稳定的电催化剂。

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