天津大学胡文彬&丁佳等：具有表面微应变的超晶格有序Pt2CoNi金属间纳米催化剂用于高效氢电催化
2025-08-19 14:53:12
作者：中国科学材料 来源：中国科学材料
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Pt与非贵金属合金化可有效优化Pt基电催化剂的活性。然而，由于合金中的元素随机分布和原子间的弱键合，开发高活性和稳定的氢电催化剂仍具有挑战性。近日，天津大学胡文彬教授和丁佳教授等人在Science China Materials发表研究论文，报道了一种富含表面微应变的Pt2CoNi金属间纳米催化剂用于高性能氢电催化。
本文要点
1) 超晶格有序晶体结构确保了该纳米催化剂中原子的特定占位，从而形成了Pt原子和Co/Ni原子的交替排列。在一个纳米颗粒中，多个Pt2CoNi晶粒沿不同的晶向排列。由于金属间化合物晶格参数的差异，产生了大量表面微应变。2) 独特的晶体结构有效地调节了Pt2CoNi金属间化合物纳米催化剂的电子分布。这种纳米催化剂的活性位点显示出下移的d带中心，从而加速了氢吸附/解析行为。3) 因此Pt2CoNi金属间化合物纳米催化剂在析氢反应（质量活性为1.02 A/mgPt且10,000次循环后η10变化为3.7 mV）和氢氧化反应（动力学质量活性为4.08 A/mgPt且在0.1 V vs. RHE下工作12小时后活性保持率为97.3%）方面表现出令人印象深刻的双功能氢电催化能力。这项工作为开发具有独特晶体结构的高效纳米催化剂提供了一条有潜力途径。Figure 1. (a) Schematic illustration of the Pt2CoNi IMC synthesis process. (b, c) HAADF-STEM images of Pt2CoNi IMC. (d) EDS line scanning profiles and (e) EDS elemental mappings of Pt2CoNi IMC.Figure 2. (a) XRD pattern of Pt2CoNi IMC. (b) Aberration-corrected HAADF-STEM images of Pt2CoNi IMC. (c) The integrated pixel intensities of Pt2CoNi IMC measured from (b). (d, e) FFT patterns, schematic of the corresponding unit cell, and localized atomic-resolution HAADF-STEM images from (b). (f) Microstrain distribution of Pt2CoNi IMC. (g) High-resolution XPS spectra of Pt 4f for Pt2CoNi IMC and 20 wt.% Pt/C. High-resolution XPS spectra of (h) Co 2p and (i) Ni 2p for Pt2CoNi IMC.
Figure 3. (a) Polarization curves and overpotential comparison at different current densities of Pt2CoNi IMC and 20 wt.% Pt/C. (b) Tafel plots, (c) Nyquist plots of Pt2CoNi IMC and 20 wt.% Pt/C. (d) Pt loading normalized polarization curves and ECSA normalized polarization curves of Pt2CoNi IMC and 20 wt.% Pt/C. (e) Comparison of the overpotentials at 10 mA/cm2 and mass activity at −0.05 V vs. RHE between Pt2CoNi IMC and state-of-the-art electrocatalysts. (f) Stability test of Pt2CoNi IMC. The polarization curves were recorded before and after 10,000 CV cycles. Inset shows the chronopotentiometry curve recorded at 10 mA/cm2.
Figure 4. (a) Polarization curves of Pt2CoNi IMC and 20 wt.% Pt/C at a rotating rate of 1600 r.p.m. (b) Polarization curves of Pt2CoNi IMC at varied rotating speeds (inset: corresponding Koutechy-Levich plots). (c) Tafel plots of the kinetic current densities. (d) Linear fitting curves of Pt2CoNi IMC and 20 wt.% Pt/C in the micro-polarization region. (e) Kinetic mass activity comparison of Pt2CoNi IMC at 0.05 V vs. RHE with previously reported high-performance PGM-based electrocatalysts. (f) Chronoamperometry response of Pt2CoNi IMC and 20 wt.% Pt/C at 0.1 V vs. RHE.
Tao Zhang (张涛) received his bachelor’s degree from Tianjin University. He is currently a PhD student of materials science and engineering at Tianjin University. His research focuses on the intermetallic nanocatalysts.
Jia Ding (丁佳) is a professor at the School of Materials Science and Engineering, Tianjin University. He received his PhD degree from the University of Alberta in 2015. His research mainly focuses on nanomaterials and devices for electrochemical energy storage and electrocatalysis.
Wenbin Hu (胡文彬) is a professor at the School of Materials Science and Engineering, Tianjin University. He received his bachelor’s and master’s degrees from Central South University and Tianjin University in 1988 and 1991, respectively. He obtained his PhD degree from Central South University in 1994. His research mainly focuses on the design, synthesis and characterization of advanced nanomaterials for energy storage and conversion applications.
Tao Zhang, Xin Wang, Wanqing Song, Jiahui Feng, Xinyi Yang, Haozhi Wang, Jia Ding, Wenbin Hu. Superlattice ordering Pt2CoNi intermetallic nanocatalysts with surface microstrain for efficient hydrogen electrocatalysis. Sci. China Mater. (2025).
https://doi.org/10.1007/s40843-025-3525-6
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