Lu Xueyi, Wang Ziling, Yang Yang, Liao Shijun, Lu Xia
School of Materials, Sun Yat-sen University, Shenzhen 510817, China.
Key Laboratory of Fuel Cell Technology of Guangdong Province, Guangzhou 510641, China.
ACS Appl Mater Interfaces. 2021 Jul 14;13(27):31725-31732. doi: 10.1021/acsami.1c07846. Epub 2021 Jul 2.
Finding a highly efficient catalyst for proton exchange membrane fuel cells is still the subject of extensive research. This article describes heterostructured Pd/Ti/Pd bimetallic thin films prepared using a strain-release technology as electrocatalysts for fuel cells. With their particular structure, these materials exhibit intriguing electrocatalytic activity toward the oxidation of both methanol and formic acid, yielding current densities of 0.17 and 0.56 A mg, much superior to that of the commercial Pd black catalyst. Moreover, the Pd/Ti/Pd thin films display a low onset oxidation potential and extremely high current retention in both acidic and alkaline media. The carbon monoxide poisoning resistance is also significantly enhanced, thus contributing to ultrahigh stability in the long-term electrocatalytic processes. Their encouraging performance implies that such composites could be potential materials for energy conversion in the fuel cell field.
寻找一种用于质子交换膜燃料电池的高效催化剂仍然是广泛研究的课题。本文描述了使用应变释放技术制备的异质结构Pd/Ti/Pd双金属薄膜作为燃料电池的电催化剂。由于其特殊的结构，这些材料对甲醇和甲酸的氧化表现出有趣的电催化活性，产生的电流密度分别为0.17和0.56 A mg，远优于商业钯黑催化剂。此外，Pd/Ti/Pd薄膜在酸性和碱性介质中均显示出低起始氧化电位和极高的电流保持率。抗一氧化碳中毒能力也显著增强，从而有助于在长期电催化过程中实现超高稳定性。它们令人鼓舞的性能表明，这种复合材料可能是燃料电池领域能量转换的潜在材料。
