A Robust PtNi Nanoframe/N-Doped Graphene Aerogel Electrocatalyst with Both High Activity and Stability
A Robust PtNi Nanoframe/N-Doped Graphene Aerogel Electrocatalyst with Both High Activity and Stability
复制标题
具有高活性和稳定性的鲁棒 PtNi 纳米框架/氮掺杂石墨烯气凝胶电催化剂
DOI：
10.1002/anie.202015679
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Liu Wei
中科院分区：
文献类型：
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作者：
Yang Jing;Huebner Rene;Zhang Jiangwei;Wan Hao;Zheng Yuanyuan;Wang Honglei;Qi Haoyuan;He Lanqi;Li Yi;Dubale Amare Aregahegn;Sun Yujing;Liu Yuting;Peng Daoling;Meng Yuezhong;Zheng Zhikun;Rossmeisl Jan;Liu Wei
铂基电催化剂的催化活性和稳定性不高、成本较高是制约其广泛应用的主要因素。本论文通过叔丁醇辅助的结构重构，制备了一种在酸性电解液中对甲醇氧化反应(MOR)具有优异性能的层状多孔PtNi纳米框架/N掺杂石墨烯气凝胶(PtNiNF-NGA)电催化剂。高合金化程度调制的电子结构和相应的最佳MOR反应路径、层次化孔洞、薄边、富铂角的结构优势以及NGA的锚定作用，赋予了PtNiNf-NGA突出的电催化活性和稳定性。该催化剂的质量和比活性(1647 mA mgpt−1，3.8 mA cm−2)分别是商品铂碳的5.8倍和7.8倍，在5小时计时电流测试和2200次循环伏安扫描下表现出优异的稳定性。
Insufficient catalytic activity and stability and high cost are the barriers for Pt‐based electrocatalysts in wide practical applications. Herein, a hierarchically porous PtNi nanoframe/N‐doped graphene aerogel (PtNiNF‐NGA) electrocatalyst with outstanding performance toward methanol oxidation reaction (MOR) in acid electrolyte has been developed via facile tert‐butanol‐assisted structure reconfiguration. The ensemble of high‐alloying‐degree‐modulated electronic structure and correspondingly the optimum MOR reaction pathway, the structure superiorities of hierarchical porosity, thin edges, Pt‐rich corners, and the anchoring effect of the NGA, endow the PtNiNF‐NGA with both prominent electrocatalytic activity and stability. The mass and specific activity (1647 mA mgPt−1, 3.8 mA cm−2) of the PtNiNF‐NGA are 5.8 and 7.8 times higher than those of commercial Pt/C. It exhibits exceptional stability under a 5‐hour chronoamperometry test and 2200‐cycle cyclic voltammetry scanning.