Pareek Alka, Paik Pradip, Borse Pramod H
International Advanced Research Centre for Powder Metallurgy and New Materials, Balapur PO, Hyderabad, 500 005, Telangana, India.
School of Engineering Science and Technology, University of Hyderabad, Gachibowli, Hyderabad-500046, Telangana, India.
Dalton Trans. 2016 Jul 5;45(27):11120-8. doi: 10.1039/c6dt01277a.
To improve the limited efficiency and stability of CdS photoanodes in a photoelectrochemical (PEC) cell, the nanostructured CdS photoanode was modified with Ni(OH)2, NiO, Co(OH)2, and Co3O4 water-oxidation-nano co-catalysts (WOC). Co(OH)2 nanorice and Ni(OH)2 nanosheet co-catalysts were obtained by a simple chemical precipitation method. Modification by the co-catalysts gives longer stability (>8 h) to CdS electrodes, and facilitates impulsive H2 evolution in PEC cells. Nano-NiO modification yields a two-fold increase in photocurrent density and the highest H2 evolution of 2.5 mmol h(-1). A dual role for Ni related co-catalysts over CdS surface, that is forming a p-n junction and acting as an effective co-catalyst, improves the photocurrent and hydrogen evolution rate, respectively. Improvement in stability was measured using X-ray photoelectron spectroscopy and prolong chronoamperometry measurements. The present report focuses on exploration of chemically synthesized earth-abundant and cost-effective co-catalysts for PEC H2 generation.
为提高光电化学（PEC）电池中硫化镉（CdS）光阳极有限的效率和稳定性，采用氢氧化镍（Ni(OH)₂）、氧化镍（NiO）、氢氧化钴（Co(OH)₂）和四氧化三钴（Co₃O₄）水氧化纳米共催化剂（WOC）对纳米结构的CdS光阳极进行了改性。通过简单的化学沉淀法制备了Co(OH)₂纳米稻和Ni(OH)₂纳米片共催化剂。共催化剂的改性使CdS电极具有更长的稳定性（>8小时），并促进了PEC电池中脉冲式析氢。纳米NiO改性使光电流密度提高了两倍，析氢量最高达到2.5 mmol h⁻¹。镍基共催化剂在CdS表面具有双重作用，即形成p-n结并作为有效的共催化剂，分别提高了光电流和析氢速率。使用X射线光电子能谱和长时间计时电流法测量了稳定性的提高。本报告重点探索用于PEC制氢的化学合成的储量丰富且成本效益高的共催化剂。
