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首页> 外文期刊>ACS applied materials & interfaces >Large-Scale, Low-Cost, and High-Efficiency Water-Splitting System for Clean H-2 Generation
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Large-Scale, Low-Cost, and High-Efficiency Water-Splitting System for Clean H-2 Generation

机译：用于清洁H-2代的大规模，低成本和高效的水分解系统

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摘要

Scaling up electrochemical water splitting is nowadays in high demand for hydrogen economy implementation. Tremendous efforts over the past decade have been focused on exploring alternative catalytic materials, including a variety of earth-abundant transition-metal-based catalysts, to replace traditional noble metals such as Pt, Ir, or Ru. Nevertheless, few efforts have been carried out for (1) scalable catalyst synthesis on current collectors and (2) practical device design toward large-scale H-2 generation. Herein, we designed a modular alkaline water-splitting electrolyzer system with scaled-up metal foam electrodes covered by low-cost NiMo alloy and Ni3Fe oxide for efficient hydrogen evolution and oxygen evolution, respectively. An electrolyte circulation system facilitates the mass transport and thus can further boost the H-2 generation particularly under large currents. As a result, the overall water-splitting performance of one-unit cell with a dimension of 10 x 10 cm(2) under room temperature presents an early onset voltage of 1.54 V and delivered practical currents of 20 and 55 A (9.1 and 25.0 L/h H-2 generation) under 2.2 and 2.9 V without iR compensations, respectively. This demonstration could stimulate new focuses in water splitting toward more practical applications.
机译：如今，缩放电化学水分裂是对氢气经济性的高需求。过去十年的巨大努力集中在探索替代催化材料，包括各种各样的地球丰富的过渡金属基催化剂，以取代传统的贵金属，例如Pt，IR或Ru。然而，已经对电流收集器和（2）实用装置设计朝大规模H-2代来进行了很少的努力（1）可扩展的催化剂合成。在此，我们设计了一种模块化碱性水分解电解槽，其具有由低成本的Nimo合金和Ni3Fe氧化物覆盖的缩放金属泡沫电极，分别用于有效的氢气进化和氧气进化。电解质循环系统有利于质量传输，因此可以在大电流下进一步提高H-2代。结果，在室温下具有10×10cm（2）的尺寸的单位电池的总水分解性能呈现为1.54 V的早期起始电压，并提供20和55a的实际电流（9.1和25.0 L / H H-2代）分别为2.2和2.9 V，分别没有红外补偿。这一示范可以刺激新的焦点在水分裂方面对更实际的应用。

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