Giving Electrocatalysts an Edge
Platinum (Pt) is an excellent catalyst for the oxygen-reduction reaction (ORR) in fuel cells and electrolyzers, but it is too expensive and scarce for widespread deployment, even when dispersed as Pt nanoparticles on carbon electrode supports (Pt/C). Alternatively,
Chen
et al.
(p.
1339
, published online 27 February; see the Perspective by
Greer
) made highly active ORR catalysts by dissolving away the interior of rhombic dodecahedral PtNi
3
nanocrystals to leave Pt-rich Pt
3
Ni edges. These nanoframe catalysts are durable—remaining active after 10,000 rounds of voltage cycling—and are far more active than Pt/C.
赋予电催化剂优势
铂(Pt)是燃料电池和电解槽中氧还原反应(ORR)的极佳催化剂,但由于价格昂贵且稀缺,即使以铂纳米颗粒的形式分散在碳电极载体(Pt/C)上,也无法广泛应用。另外、
陈
等人
(p.
1339
,2 月 27 日在线发表;见以下作者的观点
Greer
)通过溶解菱形十二面体铂镍 3 的内部,制成了高活性 ORR 催化剂。
3
纳米晶体的内部,留下富含铂的铂
3
Ni 边缘。这些纳米框架催化剂经久耐用--在 10,000 次电压循环后仍保持活性,而且活性远远高于 Pt/C。