Catalysis and Nanomaterials Lab 27, Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan.
Catalysis and Nanomaterials Lab 27, Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan.
J Colloid Interface Sci. 2019 Jun 1;545:269-275. doi: 10.1016/j.jcis.2019.03.018. Epub 2019 Mar 8.
The dearth of an efficient, robust, abundant and cost-effective water oxidation catalyst is debatably the major hurdle for the technological advancement of artificial photosynthesis devices. Herein, a three dimensional (3D) cobalt-based coordination polymer {[Co(pyz)(fa)(dmso)]·2HO}, (1) (pyz = pyrazine, fa = fumarate, dmso = dimethyl sulfoxide) has been synthesized and demonstrated to act as an efficient electrocatalyst towards water oxidation at neutral pH. Compound 1 displays a stair-like arrangement parallel to the b-axis, with the cobalt clusters arranged in a zigzag fashion, and contains small, honeycomb-like channels parallel to the c-axis. Compound 1 shows a remarkable activity for water oxidation and attains a current density of 1 mA.cm at low overpotential (η = 257 mV) with a Tafel slope value of 80.5 mV.dec. This high performance of 1 in catalysing the water oxidation reaction is attributed to its unique 3-D architecture. The results of electrochemical investigations, including long-term and controlled potential electrolysis, are anticipated to guide the forthcoming advancement in creating efficient, cheap and noble metal (Pt/Ru/Ir) free catalysts for the water oxidation reaction.
缺乏高效、稳定、丰富且经济实惠的水氧化催化剂，是人工光合作用器件技术进步的主要障碍。在此，我们合成了一种三维（3D）钴基配位聚合物{[Co(pyz)(fa)(dmso)]·2HO}，（1）（pyz=吡嗪，fa=富马酸，dmso=二甲基亚砜），并证明其在中性 pH 条件下对水氧化具有高效的电催化作用。化合物 1 沿 b 轴呈现阶梯状排列，钴簇呈之字形排列，且含有沿 c 轴平行的小型、蜂窝状通道。化合物 1 在水氧化中表现出显著的活性，在低过电势（η=257 mV）下达到 1 mA.cm 的电流密度，塔菲尔斜率值为 80.5 mV.dec。1 在催化水氧化反应中具有如此高的性能，归因于其独特的 3-D 结构。电化学研究的结果，包括长期和恒电位电解，有望为开发高效、廉价且无贵金属（Pt/Ru/Ir）的水氧化反应催化剂提供指导。
