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Mesoporous RhRu Nanosponges with Enhanced Water Dissociation toward Efficient Alkaline Hydrogen Evolution
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-01-22 , DOI: 10.1021/acsami.0c19571 Yuan Li 1 , Yan Guo 2, 3 , Sufang Yang 2, 3 , Qibiao Li 1 , Shuai Chen 2 , Baoying Lu 4 , Houbing Zou 1 , Xingchen Liu 2 , Xili Tong 2 , Hengquan Yang 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-01-22 , DOI: 10.1021/acsami.0c19571 Yuan Li 1 , Yan Guo 2, 3 , Sufang Yang 2, 3 , Qibiao Li 1 , Shuai Chen 2 , Baoying Lu 4 , Houbing Zou 1 , Xingchen Liu 2 , Xili Tong 2 , Hengquan Yang 1
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Lowering the energy barrier of water dissociation is critical to achieving highly efficient hydrogen evolution in alkaline conditions. Herein, we reported mesoporous RhRu nanosponges with enhanced water dissociation behavior as a new class of high-performance electrocatalysts for alkaline hydrogen evolution reaction (HER). The obtained nanosponges have a binary alloy structure (fcc) and a highly porous structure with high surface area. Our RhRu catalyst displayed an outstanding HER activity with an overpotential of 25 mV at 10 mA cm–2 and a Tafel slope of 47.5 mV dec–1 in 1.0 M KOH, which significantly outperformed that of commercial Pt/C catalyst and was even comparable to the classic Pt/metal (hydro)oxide catalysts. Density functional theory (DFT) calculations disclosed that charge redistribution on the RhRu alloy surface enabled tuning of the Ru d-band center and then promoted the adsorption and dissociation of water molecules. Based on the experimental results and theoretical modeling, a bifunctional mechanism contributed to the remarkable alkaline HER activity on the RhRu catalyst surface.
中文翻译：
介孔的RhRu纳米海绵具有增强的水离解能力，可有效地释放碱性氢。
降低水离解的能垒对于在碱性条件下实现高效的氢气释放至关重要。在本文中，我们报道了具有增强的水离解行为的介孔RhRu纳米海绵，作为碱性氢释放反应（HER）的一类新型高性能电催化剂。所获得的纳米海绵具有二元合金结构（fcc）和具有高表面积的高度多孔结构。我们的RhRu催化剂表现出出色的HER活性，在10 mA cm –2时过电势为25 mV，Tafel斜率dec –1为47.5 mV。在1.0 M KOH中，其性能明显优于商用Pt / C催化剂，甚至可以与经典的Pt /金属（氢）氧化物催化剂媲美。密度泛函理论（DFT）计算表明，RhRu合金表面上的电荷重新分布使Ru d能带中心得以调整，进而促进了水分子的吸附和解离。根据实验结果和理论模型，双功能机制有助于RhRu催化剂表面上显着的碱性HER活性。
更新日期：2021-02-03
中文翻译：
介孔的RhRu纳米海绵具有增强的水离解能力，可有效地释放碱性氢。
降低水离解的能垒对于在碱性条件下实现高效的氢气释放至关重要。在本文中，我们报道了具有增强的水离解行为的介孔RhRu纳米海绵，作为碱性氢释放反应（HER）的一类新型高性能电催化剂。所获得的纳米海绵具有二元合金结构（fcc）和具有高表面积的高度多孔结构。我们的RhRu催化剂表现出出色的HER活性，在10 mA cm –2时过电势为25 mV，Tafel斜率dec –1为47.5 mV。在1.0 M KOH中，其性能明显优于商用Pt / C催化剂，甚至可以与经典的Pt /金属（氢）氧化物催化剂媲美。密度泛函理论（DFT）计算表明，RhRu合金表面上的电荷重新分布使Ru d能带中心得以调整，进而促进了水分子的吸附和解离。根据实验结果和理论模型，双功能机制有助于RhRu催化剂表面上显着的碱性HER活性。
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