中国科学技术大学Pin Meng团队近日报道了五重孪晶镍纳米颗粒催化氢氧交换膜燃料电池的高效氧化研究。这一研究成果发表在2025年7月10日出版的《德国应用化学》杂志上。

多种中间体的独立调控对于优化镍（Ni）的电子结构，从而提高其在氢氧化反应（HOR）中的催化性能至关重要。然而，传统的基于Hammer-Nrskov d波段模型经常以同步方式改变HBE和OHBE。

研究组发现，由五重孪晶镍纳米颗粒组成的催化剂可以通过应变效应分别调节氢结合能（HBE）和羟基结合能（OHBE）。实验和理论计算表明，靠近孪晶界（TB）的拉伸应变显著增强了OHBE，由于独特的几何效应，可以调节HBE，并大大降低了特定部位的HBE，从而实现了前所未有的HOR活性。

该催化剂的jk，m值为106 mA mgNi^-1，是Ni/C催化剂的24.2倍。氢氧化物交换膜燃料电池（HEMFC）具有五倍双镍纳米颗粒阳极，以H₂/O₂气体为进料，其峰值功率密度（PPD）为805 mW cm^-2，是目前报道的镍基电催化剂中性能最高的。此外，该催化剂还表现出优异的长期循环性能，为无铂族金属（PGM） hemfc的商业化迈出了一大步。

附：英文原文

Title: High-Efficiency Hydrogen Oxidation for Hydroxide Exchange Membrane Fuel Cells Catalyzed by Fivefold-Twinned Nickel Nanoparticles

Author: Pin Meng, Yang Yang, Jiahe Yang, Peichen Wang, Chenyang Bi, Hongda Shi, Yunlong Zhang, Xingyan Chen, Dingge Fan, Siyan Chen, Xi Lin, Dongdong Wang, Qianwang Chen

Issue&Volume: 2025-07-10

Abstract: The independent regulation of multiple intermediates is critically important for optimizing the electronic structure of nickel (Ni), thereby improving its catalytic performance in the hydrogen oxidation reaction (HOR). However, conventional regulation strategies based on the Hammer–Nrskov d-band model often change the HBE and OHBE in a synchronized manner. Herein, we find that a catalyst consisting of fivefold-twinned ultrasmall Ni nanoparticles could tune hydrogen binding energy (HBE) and hydroxyl binding energy (OHBE) individually via the strain effect. Experimental and theoretical calculations suggest that tensile strain in proximity to the twin boundary (TB) significantly enhances OHBE, allows for adjustable HBE due to unique geometric effects, and greatly reduces HBE at specific sites, enabling an unprecedented HOR activity. The catalyst has a high jk,m value of 106 mA mgNi-1, which is 24.2 times greater than that of Ni/C. The hydroxide exchange membrane fuel cell (HEMFC) with a fivefold-twinned Ni nanoparticle anode delivers a peak power density (PPD) of 805 mWcm-2 with a H2/O2 gas feed, which is the highest among Ni-based electrocatalysts reported thus far. Furthermore, the catalyst also exhibits excellent long-term cycling performance, taking a giant step forward toward the commercialization of platinum group metal (PGM)-free HEMFCs.

DOI: 10.1002/anie.202511219

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202511219