Synergistic Hybrid Electrocatalysts of Platinum Alloy and Single-Atom Platinum for an Efficient and Durable Oxygen Reduction Reaction

被引：107

作者：

Liu, Bowen ^{[1
]}

Feng, Ruohan ^{[1
]}

Busch, Michael ^{[2
]}

Wang, Sihong ^{[1
]}

Wu, Haofei ^{[1
]}

Liu, Pan ^{[1
]}

Gu, Jiajun ^{[1
]}

Bahadoran, Ashkan ^{[1
]}

Matsumura, Daiju ^{[3
]}

Tsuji, Takuya ^{[3
]}

Zhang, Di ^{[1
]}

Song, Fang ^{[1
]}

Liu, Qinglei ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

[2] Aalto Univ, Sch Chem Engn, Dept Chem & Mat Sci, Espoo 02150, Finland

[3] Japan Atom Energy Agcy, Mat Sci Res Ctr, SPring 8, Sayo, Hyogo 6795148, Japan

来源：

ACS NANO | 2022年 / 16卷 / 09期

基金：

中国国家自然科学基金;

关键词：

sodium alginate; platinum alloy; single-atom platinum; oxygen reduction reaction; hybrid electrocatalyst; zinc-air battery; CATALYSTS; CHEMISORPTION; NANOPARTICLES; DESORPTION;

D O I：

10.1021/acsnano.2c04077

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Pt single-atom materials possess an ideal atom economy but suffer from limited intrinsic activity and side reaction of producing H2O2 in catalyzing the oxygen reduction reaction (ORR); platinum alloys have higher intrinsic activity but weak stability. Here, we demonstrate that anchoring platinum alloys on single-atom Pt-decorated carbon (PtSAC) surmounts their inherent deficiencies, thereby enabling a complete four-electron ORR pathway catalysis with high efficiency and durability. Pt3Co@Pt-SAC demonstrates an exceptional mass and specific activities 1 order of magnitude higher than those of commercial Pt/C. They are durable throughout 50000 cycles, showing only a 10 mV decay in half-wave potential. An in situ Raman analysis and theoretical calculations reveal that Pt3Co core nanocrystals modulate electron structures of the adjacent Pt single atoms to facilitate the intermediate absorption for fast kinetics. The superior durability is attributed to the shielding effect of the Pt-SAC coating, which significantly mitigates the dissolution of Pt3Co cores. The hybridizing strategy might promote the development of highly active and durable ORR catalysts.

引用

页码：14121 / 14133

页数：13

共 56 条

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