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Ultra-Rapid In Situ Synthesis of Cu2S Nanosheet Arrays on Copper Foam with Room Temperature Active Iodine Plasma for Efficient and Cost-Effective Oxygen Evolution Liangbo He, Dan Zhou, Yao Lin, Ruixiang Ge, Xiandeng Hou, Xuping Sun, and Chengbin Zheng ACS Catal., Just Accepted Manuscript • DOI: 10.1021/acscatal.8b00032 • Publication Date (Web): 26 Mar 2018 Downloaded from http://pubs.acs.org on March 27, 2018
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ACS Catalysis
Ultra-Rapid In Situ Synthesis of Cu2S Nanosheet Arrays on Copper Foam with Room Temperature Active Iodine Plasma for Efficient and Cost-Effective Oxygen Evolution Liangbo He,† Dan Zhou,† Yao Lin,† Ruixiang Ge,† Xiandeng Hou,‡ Xuping Sun,*, † and Chengbin Zheng*, † †
Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China ‡ Analytical and Test Center, Sichuan University, Chengdu 610064, Sichuan, China ABSTRACT: Developing simple and cost-effective methods for the rapid synthesis of oxygen evolution reaction (OER) electrocatalysts from earth-abundant elements is a highly desired yet challenging task. Herein we report a two-step strategy based on use of a room temperature and atmospheric pressure active iodine DBD plasma and an anion exchange reaction for the in situ generation of 3D Cu2S nanosheet arrays on Cu foam (Cu2S/CF). Owing to the advantages of this plasma-based approach, and the extremely rapid anion exchange reaction between the generated CuI and S2-, synthesis of the Cu2S/CF OER catalyst can be accomplished within 6 min. The porous 3D catalyst exhibited prominent electrocatalytic activity and persistent stability (>10 h) for OER with a 336 mV of overpotential to drive a 20 mA cm-2 of geometrical current density in 1.0 M KOH, comparable to the performance of a noble-metal IrO2/CF electrode. ABSTRACT: active iodine plasma, Cu2S nanosheet arrays, electrocatalysis, oxygen evolution
temperature annealing treatments, which are tedious, energyand time-consuming.26 Hence, it is attractive to scientist to develop simpler and faster strategies for the synthesis of efficient, low-cost OER catalysts.
Considerable attention has been devoted to water splitting (2H2O → O2 + 2H2) because hydrogen is an ideal and renewable high density energy source with environmentally friendly characteristics to address the increasingly serious energy crisis and associated environmental problems.1,2 Water splitting is one of the most promising approaches to generate pure hydrogen from water and solar (or electric) energy.3 Compared to cathodic hydrogen evolution, anodic oxidation of water is a more energy-intensive reaction and thus becomes the Achilles Heel to improvement of water-splitting technologies.4−10 Noble metal substances (RuO2 or IrO2) are the current benchmarking oxygen evolution reaction (OER) catalysts, but the high cost and scarcity of these metals seriously hinder their further large-scale application.11 Therefore, significant efforts have been made to develop efficient OER catalysts from earthabundant elements. Besides the catalysts of nickel, cobalt and iron, copper counterparts (oxides, phosphides, and tellurides) have also been intensively studied and retain great potential as promising OER catalysts.12−25 However, most of the preparation methods involve hydrothermal processes or high-
Arc-discharge plasmas have proven to be one of the most mature and simple methods for efficient and rapid synthesis of fullerene and CNTs.27,28 For the preparation of electrochemical catalysts, Zhang et al. were the first to report that a N2 plasma (450 oC) could significantly accelerate the synthesis rate of transition metal nitride-based OER electrodes and reduce the synthesis time to 15 minutes.29 Very recently, a novel PH3 plasma-assisted strategy was also developed to prepare ternary NiCoP catalyst from NiCo hydroxide precursor.30 Despite increased interest in using plasmas for preparation of needed catalysts, the applications of low temperature (
