Kani Kenya, Kim Jeonghun, Jiang Bo, Hossain Md Shahriar A, Bando Yoshio, Henzie Joel, Yamauchi Yusuke
Australian Institute for Bioengineering and Nanotechnology (AIBN), University of Queensland, Brisbane, QLD 4072, Australia.
Nanoscale. 2019 Jun 6;11(22):10581-10588. doi: 10.1039/c9nr03644j.
Making mesoporous rhodium (Rh) with traditional soft-templating methods is challenging because Rh has a high surface energy compared to other metals. Here, we report a synthetic concept to generate mesoporous Rh films (MRFs) by electrochemical co-deposition of Rh precursors and block copolymer micelles. We investigate the effect of deposition potentials and pH on the resulting mesoporous structures. Controlled electrodeposition enables us to conformally coat the entire surface of the electrode with a homogeneous mesoporous Rh film with any arbitrary thickness up to ∼840 nm. The average pore size of the MRF is ∼14 nm, with an average wall thickness of ∼9.5 nm. Since the MRFs are directly deposited on conducting substrates, they can be used as porous electrodes for various important electrocatalytic reactions. We examine the performance of these MRFs for the electrochemical methanol oxidation reaction (MOR) and find that they have a mass-normalized peak current density ∼4 times higher than a commercial Rh black (RhB) catalyst.
采用传统软模板法制备介孔铑（Rh）具有挑战性，因为与其他金属相比，Rh具有较高的表面能。在此，我们报道了一种通过Rh前驱体与嵌段共聚物胶束的电化学共沉积来制备介孔Rh薄膜（MRF）的合成概念。我们研究了沉积电位和pH值对所得介孔结构的影响。可控电沉积使我们能够在电极的整个表面上均匀地涂覆一层厚度可达约840nm的任意厚度的介孔Rh薄膜。MRF的平均孔径约为14nm，平均壁厚约为9.5nm。由于MRF直接沉积在导电基底上，它们可用作各种重要电催化反应的多孔电极。我们研究了这些MRF对电化学甲醇氧化反应（MOR）的性能，发现它们的质量归一化峰值电流密度比市售Rh黑（RhB）催化剂高约4倍。
