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首页> 外文期刊>Catalysis science & technology >Galvanic displacement as a route to highly active and durable extended surface electrocatalysts
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Galvanic displacement as a route to highly active and durable extended surface electrocatalysts

机译：电流位移是通向高度活跃且耐用的延长表面电催化剂的途径

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Spontaneous galvanic displacement has been utilized in the development of novel electrocatalysts. The process occurs when a less noble metal template contacts a more noble metal cation and combines aspects of corrosion and electrodeposition. The cost of platinum (Pt) limits the commercial deployment of proton exchange membrane fuel cells. Although carbon-supported Pt typically has a moderate mass activity for oxygen reduction, it is limited by a relatively modest specific activity (activity per unit surface area). Conversely, extended Pt surfaces typically have high specific activity for oxygen reduction but commonly have low surface areas. Catalysts formed by spontaneous galvanic displacement are ideally situated, being able to take advantage of the specific activities generally associated with the catalyst type while significantly improving upon the surface area. In addition to acidic oxygen reduction, spontaneous galvanic displacement has been used in the development of catalysts for a variety of electrochemical reactions: hydrogen oxidation, alcohol oxidation, and basic oxygen reduction. Materials for these reactions have been incorporated into this perspective. Spontaneous galvanic displacement is a promising route in catalyst synthesis and cases exist where these electrocatalysts have demonstrated state-of-the-art performance.
机译：自发电流位移已用于新型电催化剂的发展。当不太高贵的金属模板接触更高贵的金属阳离子并结合腐蚀和电沉积的各个方面时，就会发生该过程。铂（PT）的成本限制了质子交换膜燃料电池的商业部署。尽管碳支持的PT通常具有减少氧气的中等质量活性，但它受到相对适中的特定活性（每个单位表面积）的限制。相反，扩展的PT表面通常具有较高的氧气减少活性，但表面积通常很低。由自发电流位移形成的催化剂是理想位置的，能够利用通常与催化剂类型相关的特定活性，同时显着改善表面积。除了还原酸性氧气外，还将自发的电流位移用于多种电化学反应的催化剂中：氢氧化，酒精氧化和碱性氧气还原。这些反应的材料已纳入了这一观点。自发的电流位移是催化剂合成的有前途的途径，并且存在这些电催化剂表现出最新性能的情况。

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