Zi-Jun Zou, Shi-Yi Yin, Yao Tang, Sheng-Liang Zhong, Lei Wang, Shi-Long Xu, Hai-Wei Liang
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引用次数: 0
摘要
碳支撑铂-镧(Pt-Ln)金属间化合物(IMC)纳米粒子具有高活性和强大的稳定性,已被证明可作为质子交换膜燃料电池的阴极催化剂。然而,Pt-Ln IMC 催化剂的制备需要高温退火处理,这不可避免地会导致纳米颗粒烧结,从而显著降低电化学表面积和质量活性。在此,我们通过低熔点金属掺杂策略制备了小尺寸的 M 掺杂 Pt5Ce(M = Ga、Cd 和 Sb)IMCs 催化剂。我们推测,掺杂低熔点金属可通过热活化促进晶格中空位的产生,从而降低金属间 Pt5Ce 催化剂形成的动力学障碍。与未掺杂的 Pt5Ce 和商用 Pt/C 催化剂相比,制备的掺镓 Pt5Ce 催化剂具有更高的电化学活性表面积(81 m2-gPt-1)和更大的质量活性(0.9 V 时为 0.45 A-mgPt-1)。在膜电极组装测试中,掺杂 Ga 的 Pt5Ce 阴极在 0.67 V 时的功率密度为 0.98 W-cm-2,在加速稳定性测试结束时,0.8 A-cm-2 的电压损失仅为 27 mV。
A low-melting-point metal doping strategy for the synthesis of small-sized intermetallic Pt5Ce fuel cell catalysts
Carbon-supported platinum-lanthanum (Pt-Ln) intermetallic compound (IMC) nanoparticles with high activity and robust stability have been demonstrated as promising cathode catalysts for proton-exchange membrane fuel cells. However, the preparation of Pt-Ln IMC catalysts needs high-temperature annealing treatment that inevitably causes nanoparticle sintering, resulting in significant reduction of the electrochemical surface area and mass-based activity. Here, we prepare small-sized M-doped Pt5Ce (M = Ga, Cd, and Sb) IMCs catalysts via a low-melting-point metal doping strategy. We speculate that the doping of low-melting-point metals can facilitate the generation of vacancies in the crystal lattice through thermal activation and thus reduce the kinetic barriers for the formation of intermetallic Pt5Ce catalysts. The prepared Ga-doped Pt5Ce catalyst exhibits a higher electrochemical active surface area (81 m2·gPt−1) and a larger mass activity (0.45 A·mgPt−1 at 0.9 V) over the undoped Pt5Ce and commercial Pt/C catalysts. In the membrane electrode assembly test, the Ga-doped Pt5Ce cathode delivers a power density of 0.98 W·cm−2 at 0.67 V, along with a voltage loss of only 27 mV at 0.8 A·cm−2 at the end of accelerated stability test.
期刊介绍:
Nano Research is a peer-reviewed, international and interdisciplinary research journal that focuses on all aspects of nanoscience and nanotechnology. It solicits submissions in various topical areas, from basic aspects of nanoscale materials to practical applications. The journal publishes articles on synthesis, characterization, and manipulation of nanomaterials; nanoscale physics, electrical transport, and quantum physics; scanning probe microscopy and spectroscopy; nanofluidics; nanosensors; nanoelectronics and molecular electronics; nano-optics, nano-optoelectronics, and nano-photonics; nanomagnetics; nanobiotechnology and nanomedicine; and nanoscale modeling and simulations. Nano Research offers readers a combination of authoritative and comprehensive Reviews, original cutting-edge research in Communication and Full Paper formats. The journal also prioritizes rapid review to ensure prompt publication.