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Bifunctional Porous Cobalt Phosphide Foam for High-Current-Density Alkaline Water Electrolysis with 4000-h Long Stability
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-06-16 , DOI: 10.1021/acssuschemeng.0c02671 Yue Li 1, 2 , Bin Wei 1 , Zhipeng Yu 1, 3 , Oleksandr Bondarchuk 1 , Ana Araujo 1 , Isilda Amorim 1, 2 , Nan Zhang 1 , Junyuan Xu 1 , Isabel C. Neves 2, 4 , Lifeng Liu 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-06-16 , DOI: 10.1021/acssuschemeng.0c02671 Yue Li 1, 2 , Bin Wei 1 , Zhipeng Yu 1, 3 , Oleksandr Bondarchuk 1 , Ana Araujo 1 , Isilda Amorim 1, 2 , Nan Zhang 1 , Junyuan Xu 1 , Isabel C. Neves 2, 4 , Lifeng Liu 1
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Alkaline water electrolysis is a cost-effective approach to hydrogen production, but it suffers from low operational current densities (typically ≤500 mA cm–2) and thereby a low hydrogen production rate. Herein we report the fabrication of self-supported porous cobalt phosphide (Co–P) foam by electrochemical anodization of commercially available cobalt foam, followed by thermal oxidation and subsequent phosphorization. The as-obtained porous Co–P foam, compared to other control samples prepared under different conditions, shows outstanding electrocatalytic performance in alkaline electrolyte for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), requiring an overpotential of 290 mV for HER and 380 mV for OER, respectively, at a high current density of 1000 mA cm–2. Moreover, the electrolyzer consisting of two symmetric porous Co–P foam electrodes only requires a cell voltage of 1.98 V to operate at 1000 mA cm–2 for overall water electrolysis, with extraordinary stability of 4000 h, showing great potential for use in industrial alkaline water electrolysis.
中文翻译：
用于高电流密度碱性水电解且具有4000h长稳定性的双功能多孔磷化钴泡沫
碱性水电解是生产氢气的一种经济有效的方法，但是它的工作电流密度较低（通常≤500 mA cm –2），因此氢气生产率较低。本文中，我们报告了通过对商用钴泡沫进行电化学阳极氧化，随后进行热氧化和随后的磷化处理，制备自支撑多孔磷化钴（Co-P）泡沫的过程。与在不同条件下制备的其他对照样品相比，所获得的多孔Co-P泡沫在碱性电解液中对氢气释放反应（HER）和氧气释放反应（OER）均具有出色的电催化性能，需要290 mV的超电势在1000 mA cm –2的高电流密度下，分别用于HER和380 mV（对于OER）。此外，由两个对称的多孔Co-P泡沫电极组成的电解槽仅需1.98 V的电池电压即可在1000 mA cm –2的条件下进行整体水电解，并具有4000 h的非凡稳定性，显示出在工业碱性环境中使用的巨大潜力水电解。
更新日期：2020-07-13
中文翻译：
用于高电流密度碱性水电解且具有4000h长稳定性的双功能多孔磷化钴泡沫
碱性水电解是生产氢气的一种经济有效的方法，但是它的工作电流密度较低（通常≤500 mA cm –2），因此氢气生产率较低。本文中，我们报告了通过对商用钴泡沫进行电化学阳极氧化，随后进行热氧化和随后的磷化处理，制备自支撑多孔磷化钴（Co-P）泡沫的过程。与在不同条件下制备的其他对照样品相比，所获得的多孔Co-P泡沫在碱性电解液中对氢气释放反应（HER）和氧气释放反应（OER）均具有出色的电催化性能，需要290 mV的超电势在1000 mA cm –2的高电流密度下，分别用于HER和380 mV（对于OER）。此外，由两个对称的多孔Co-P泡沫电极组成的电解槽仅需1.98 V的电池电压即可在1000 mA cm –2的条件下进行整体水电解，并具有4000 h的非凡稳定性，显示出在工业碱性环境中使用的巨大潜力水电解。
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