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Bulk‐immiscible AgRh Alloy Nanoparticles as a Highly Active Electrocatalyst for the Hydrogen Evolution Reaction
ChemNanoMat ( IF 3.8 ) Pub Date : 2020-07-23 , DOI: 10.1002/cnma.202000381
Albert J. Darling 1 , Shea Stewart 1 , Cameron F. Holder 1 , Raymond E. Schaak 2
Affiliation  

Alloying metals can achieve enhanced kinetics for the hydrogen evolution reaction (HER), but most known HER alloy catalysts combine metals that are miscible in the bulk. Theoretical studies suggest that bulk‐immiscible AgRh alloys will exhibit near‐zero hydrogen binding energies, which is important for high‐performing HER catalysts. Current routes to AgRh nanoparticles yield only small quantities or require specialized setups. Here, we establish a ligand‐free, scalable synthesis of AgRh nanoparticles and demonstrate their catalytic viability for the HER under acidic conditions. AgRh nanoparticle electrodes exhibited low operating potentials with current densities of −10 and −100 mA/cm2 at overpotentials of −17 and −32 mV, respectively. The electrodes were highly durable with very little change in overpotentials required to maintain hydrogen production for 24 h and after 400 successive cycles. These results establish bulk‐immiscible AgRh alloys as promising non‐Pt HER catalysts.

中文翻译:

大量不混溶的AgRh合金纳米颗粒作为氢释放反应的高活性电催化剂

合金化金属可以提高析氢反应(HER)的动力学性能,但是大多数已知的HER合金催化剂结合了可在本体中混溶的金属。理论研究表明,与大块不混溶的AgRh合金将表现出接近零的氢键能,这对于高性能HER催化剂很重要。当前通往AgRh纳米粒子的途径仅产生少量或需要专门的设置。在这里,我们建立了无配体的AgRh纳米颗粒的可扩展合成方法,并证明了它们在酸性条件下对HER的催化活性。AgRh纳米粒子电极表现出低工作电位,电流密度为-10和-100 mA / cm 2在分别为-17和-32 mV的过电势下。电极具有很高的耐用性,并且在24个连续循环后以及24小时内保持氢气产生所需的过电势变化很小。这些结果确定了与大块不混溶的AgRh合金是有前途的非Pt HER催化剂。
更新日期:2020-07-23
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