Stabilizing atomic Pt with trapped interstitial F in alloyed PtCo nanosheets for high-performance zinc-air batteries
Stabilizing atomic Pt with trapped interstitial F in alloyed PtCo nanosheets for high-performance zinc-air batteries
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DOI：
10.1039/c9ee02657f
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发表时间：
2020-03
影响因子：
32.5
通讯作者：
Z. Li;W. Niu;Zhenzhong Yang;Nusaiba Zaman;W. Samarakoon;Maoyu Wang;A. Kara;M. Lucero;Manasi V. V
中科院分区：
文献类型：
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作者：
Z. Li;W. Niu;Zhenzhong Yang;Nusaiba Zaman;W. Samarakoon;Maoyu Wang;A. Kara;M. Lucero;Manasi V. V
近年来，为了减少铂消耗，提高催化剂稳定性，从而提高燃料电池和锌空气电池（ZAB）等可再生能源装置中的催化剂性能，原子铂（Pt）催化剂在理想载体上的稳定性受到了相当多的关注。在此，我们合理地设计了一种新策略，用于稳定 ZAB 中带有间隙氟 (SA-PtCoF) 的合金铂钴 (PtCo) 纳米片中的原子 Pt 催化剂。 PtCoF 基体中被捕获的间隙 F 原子会引起晶格畸变，导致 Pt-Co 键减弱，而 Pt-Co 键是形成原子 Pt 的驱动力。因此，SA-PtCoF 的氧还原和析出反应（ORR 和 OER）的起始电位分别为 0.95 V 和 1.50 V，优于商用 Pt/C@RuO2。当用于ZAB时，设计的SA-PtCoF可提供125 mW cm−2的峰值功率密度、808 mA h gZn−1的比容量和超过240小时的优异循环性能，超越了最先进的催化剂。
Recently, considerable attention has been paid to the stabilization of atomic platinum (Pt) catalysts on desirable supports in order to reduce Pt consumption, improve the catalyst stability, and thereafter enhance the catalyst performance in renewable energy devices such as fuel cells and zinc-air batteries (ZABs). Herein, we rationally designed a novel strategy to stabilize atomic Pt catalysts in alloyed platinum cobalt (PtCo) nanosheets with trapped interstitial fluorine (SA-PtCoF) for ZABs. The trapped interstitial F atoms in the PtCoF matrix induce lattice distortion resulting in weakening of the Pt–Co bond, which is the driving force to form atomic Pt. As a result, the onset potentials of SA-PtCoF are 0.95 V and 1.50 V for the oxygen reduction and evolution reactions (ORR and OER), respectively, superior to commercial Pt/C@RuO2. When used in ZABs, the designed SA-PtCoF can afford a peak power density of 125 mW cm−2 with a specific capacity of 808 mA h gZn−1 and excellent cyclability over 240 h, surpassing the state-of-the-art catalysts.