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Metal–organic framework (MOF) derived flower-shaped CoSe2 nanoplates as a superior bifunctional electrocatalyst for both oxygen and hydrogen evolution reactions
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2021-08-25 , DOI: 10.1039/d1se01112j Nachiketa Sahu 1, 2, 3 , Jiban K. Das 1, 2, 3 , J. N. Behera 1, 2, 3
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2021-08-25 , DOI: 10.1039/d1se01112j Nachiketa Sahu 1, 2, 3 , Jiban K. Das 1, 2, 3 , J. N. Behera 1, 2, 3
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The development of a non-precious metal-based stable and cost-effective bifunctional electrocatalyst remains a significant challenge for the production of hydrogen (H2) and oxygen (O2) through water splitting. Although some progress has been made to develop efficient electrocatalysts from transition metal-based nanostructured selenides, the electrocatalyst derived from metal–organic framework (MOF) transition metal selenides demands additional effort due to their well-defined morphological structure and high accessible surface area resulting in better electrochemical performances. Herein, by tuning the selenylation technique through a facile solvothermal approach, we have successfully synthesized flower-like CoSe2 nanoplates termed MOF-D CoSe2, derived from a Co-MOF of the formula [Co3(tiron-bpy)2(bpy)(H2O)8]·(H2O)2 [tiron = 4,5-dihydroxy-1,3-benzenedisulfonate disodium salt, and bpy = 4,4′-bipyridyl]. The MOF-D CoSe2 performs as an excellent bifunctional electrocatalyst, which requires an overpotential of 320 mV to achieve the predefined current density of 10 mA cm−2, with a Tafel slope of 60 mV dec−1 in 1 M KOH to catalyze the oxygen evolution reaction (OER). For the hydrogen evolution reaction (HER), MOF-D CoSe2 needs an overpotential of 195 mV at 10 mA cm−2 and a low Tafel slope of 43 mV dec−1 in an acidic medium of 0.5 M H2SO4. The enhanced bifunctional electrochemical performance of the MOF-D CoSe2 electrocatalyst has been attributed to the combination of a unique flower-shaped morphology with a plate-like nanoarchitecture, higher electrochemical active surface area and robust stability in both acidic as well as alkaline media.
中文翻译：
金属有机框架（MOF）衍生的花状 CoSe2 纳米片作为用于析氧和析氢反应的优良双功能电催化剂
开发基于非贵金属的稳定且具有成本效益的双功能电催化剂仍然是通过水分解生产氢气 (H 2 ) 和氧气 (O 2 )的重大挑战。尽管在从过渡金属基纳米结构硒化物开发高效电催化剂方面取得了一些进展，但源自金属有机骨架 (MOF) 过渡金属硒化物的电催化剂由于其明确的形态结构和高可及表面积导致需要额外的努力。更好的电化学性能。在此，通过简单的溶剂热方法调整硒化技术，我们成功合成了花状 CoSe 2纳米片，称为 MOF-D CoSe 2，衍生自式 [Co 3 (tiron-bpy) 2 (bpy)(H 2 O) 8 ]·(H 2 O) 2 [tiron = 4,5-二羟基-1,3-苯二磺酸盐的 Co-MOF二钠盐，bpy = 4,4'-联吡啶]。MOF-D CoSe 2是一种出色的双功能电催化剂，它需要 320 mV 的过电位来实现 10 mA cm -2的预定电流密度，在 1 M KOH 中需要60 mV dec -1的 Tafel 斜率来催化析氧反应 (OER)。对于析氢反应 (HER)，MOF-D CoSe 2在 10 mA cm -2 下需要 195 mV 的过电位在 0.5 MH 2 SO 4的酸性介质中具有43 mV dec -1的低塔菲尔斜率。MOF-D CoSe 2电催化剂增强的双功能电化学性能归因于独特的花形形态与板状纳米结构、更高的电化学活性表面积以及在酸性和碱性介质中的强大稳定性的结合。
更新日期：2021-09-06
中文翻译：
金属有机框架（MOF）衍生的花状 CoSe2 纳米片作为用于析氧和析氢反应的优良双功能电催化剂
开发基于非贵金属的稳定且具有成本效益的双功能电催化剂仍然是通过水分解生产氢气 (H 2 ) 和氧气 (O 2 )的重大挑战。尽管在从过渡金属基纳米结构硒化物开发高效电催化剂方面取得了一些进展，但源自金属有机骨架 (MOF) 过渡金属硒化物的电催化剂由于其明确的形态结构和高可及表面积导致需要额外的努力。更好的电化学性能。在此，通过简单的溶剂热方法调整硒化技术，我们成功合成了花状 CoSe 2纳米片，称为 MOF-D CoSe 2，衍生自式 [Co 3 (tiron-bpy) 2 (bpy)(H 2 O) 8 ]·(H 2 O) 2 [tiron = 4,5-二羟基-1,3-苯二磺酸盐的 Co-MOF二钠盐，bpy = 4,4'-联吡啶]。MOF-D CoSe 2是一种出色的双功能电催化剂，它需要 320 mV 的过电位来实现 10 mA cm -2的预定电流密度，在 1 M KOH 中需要60 mV dec -1的 Tafel 斜率来催化析氧反应 (OER)。对于析氢反应 (HER)，MOF-D CoSe 2在 10 mA cm -2 下需要 195 mV 的过电位在 0.5 MH 2 SO 4的酸性介质中具有43 mV dec -1的低塔菲尔斜率。MOF-D CoSe 2电催化剂增强的双功能电化学性能归因于独特的花形形态与板状纳米结构、更高的电化学活性表面积以及在酸性和碱性介质中的强大稳定性的结合。
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