Chakraborty Soumita, Servottam Swaraj, Samal Pankaj Kumar, Kalita Daizy, Rao Ankit, Bagchi Debabrata, Peter Sebastian C, Eswaramoorthy Muthusamy
Chemistry and Physics of Materials Unit, School of Advanced Materials (SAMat), JNCASR, Bengaluru, 560064, India.
Centre for Nano Science and Engineering, IISc, Bengaluru, Karnataka, 560012, India.
Small. 2023 Nov;19(45):e2303495. doi: 10.1002/smll.202303495. Epub 2023 Jul 11.
The development of robust electrocatalysts with low platinum content for acidic hydrogen evolution reaction (HER) is paramount for large scale commercialization of proton exchange membrane electrolyzers. Herein, a simple strategy is reported to synthesize a well anchored, low Pt containing Vulcan carbon catalyst using ZnO as a sacrificial template. Pt containing ZnO (PZ) is prepared by a simultaneous borohydride reduction. PZ is then loaded onto Vulcan carbon to produce a very low Pt content electrocatalyst, PZ@VC. PZ@VC with 2 wt.% Pt shows excellent performance for acidic HER in comparison to the commercial Pt/C (20 wt.%) catalyst. PZ@VC with a very low Pt loading shows significantly low η and η values (15 and 46 mV, respectively). PZ@VC on coating with Nafion (PZ@VC-N) shows further improvement in its performance (η of 7 mV, η of 28 mV) with ≈300 h of stability (≈10 mA cm ) with only 4 µg cm . PZ@VC-N shows a record high mass activity of 71 A mg (32 times larger than Pt/C (20 wt.%) at 50 mV of overpotential. Post reaction characterizations reveal Pt nanoparticles are embedded onto VC with no traces of zinc, suggestive of a strong metal-support interaction leading to this high stability at low Pt loading.
开发用于酸性析氢反应（HER）的低铂含量的高效电催化剂对于质子交换膜电解槽的大规模商业化至关重要。在此，报道了一种简单的策略，以氧化锌作为牺牲模板合成一种锚定良好、低铂含量的炭黑催化剂。含铂氧化锌（PZ）通过硼氢化物同时还原制备。然后将PZ负载到炭黑上以制备铂含量极低的电催化剂PZ@VC。与商业Pt/C（20 wt.%）催化剂相比，含2 wt.%铂的PZ@VC在酸性HER中表现出优异的性能。铂负载量极低的PZ@VC显示出极低的η和η值（分别为15和46 mV）。用Nafion包覆的PZ@VC（PZ@VC-N）在仅4 μg cm²的情况下，性能进一步提高（η为7 mV，η为28 mV），具有约300小时的稳定性（约10 mA cm²）。PZ@VC-N在过电位为50 mV时显示出创纪录的71 A mg⁻¹的高质量活性（比Pt/C（20 wt.%）大32倍）。反应后的表征表明，铂纳米颗粒嵌入到炭黑上，没有锌的痕迹，这表明在低铂负载量下存在强金属-载体相互作用，从而导致了这种高稳定性。
