Sekhar, S. Chandra Ramulu, Bhimanaboina Han, Man Ho Nagaraju, Manchi Arbaz, Shaik Junied Oh, Hyung-Suk Yu, Jae Su 2024-01-12T02:36:20Z 2024-01-12T02:36:20Z 2022-11-22 2022-10 2168-0485 https://pubs.kist.re.kr/handle/201004/75978 Developing cost-effective and catalytically high active noble-metal-free electrocatalysts is of great importance for high-performance and long-durable water electrolysis systems. Herein, nickel-cobalt phosphite (NCP) (M-11(HPO3)(8)(OH)(6), M = Ni and Co) microbuds are directly deposited on nickel foam (NF) by a one-step hydrothermal method to serve as an electrocatalyst for oxygen evolution reaction (OER). Owing to high electrochemical activity and good electrokinetics, the NCP material prepared for S h of reaction time (NCP-5 h@NF) as the precatalyst demonstrated superior OER activity with an overpotential of only 246 mV to generate a current density of 10 mA cm(-2) . It also exhibited a lower Tafel slope of 77 mV dec(-1). In addition, the NCP-5 h@NF revealed a stable OER activity over 24 h of the chronopotentiometry test. Concurrently, the catalyst surface was reconstructed by transforming its surface into microflowers. Moreover, an anion-exchange membrane water electrolyzer cell (AEMWEC) was fabricated with NCP-5 h@NF as an anode and platinum-carbon as a cathode to explore the capability of the NCP catalyst in an overall water splitting. The AEMWEC not only delivered a high electrolysis performance of 824 mA cm(-2) at similar to 2 V but also conserved its catalytic activity for 240 h. This new approach promotes the fabrication of cost-effective and noble-metal-free catalysts by one-step methods for durable water electrolysis systems. English American Chemical Society Reconstruction of Ni-Co Phosphites Precatalyst into Metal Oxyhydroxides for Durable Full Water Electrolyzer Cell Article 10.1021/acssuschemeng.2c03366 1 ACS Sustainable Chemistry & Engineering, v.10, no.43, pp.14163 - 14173 ACS Sustainable Chemistry & Engineering 10 43 14163 14173 N scie scopus 000882786900001 Chemistry, Multidisciplinary Green & Sustainable Science & Technology Engineering, Chemical Chemistry Science & Technology - Other Topics Engineering Article EFFICIENT BIFUNCTIONAL ELECTROCATALYST HIGHLY EFFICIENT OXYGEN EVOLUTION CATALYTIC-ACTIVITY NICOP NANOSHEETS PHOSPHATE ARRAY (Ni/Co)(11)(HPO3)(8)(OH)(6) electrocatalytic activity surface reconstruction anion-exchange membrane water electrolyzer cell 240 h stability