Self-powered H(2) production with bifunctional hydrazine as sole consumable.
Self-powered H(2) production with bifunctional hydrazine as sole consumable.
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以双功能联氨为唯一消耗品的自供电制氢
DOI：
10.1038/s41467-018-06815-9
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发表时间：
2018-10-19
影响因子：
16.6
通讯作者：
Ding Y
中科院分区：
文献类型：
--
作者：
Liu X;He J;Zhao S;Liu Y;Zhao Z;Luo J;Hu G;Sun X;Ding Y
通过电催化析氢和肼氧化反应将肼分解为H2和N2是用H2替代化石能源的有前途的方法。然而，目前的肼裂解是使用外部电源驱动两个反应来实现的，这不适用于户外使用。在这里，Fe掺杂的CoS 2纳米片被开发为用于两个反应的双功能电催化剂，通过该双功能电催化剂，实现直接肼燃料电池和整体肼裂解单元，并将其集成以形成自供电的H2生产系统。在没有外部电源的情况下，该系统采用肼双功能作为直接肼燃料电池的燃料和裂解目标，即唯一的消耗品，并表现出9.95 mmol h-1的H2析出速率，98%的法拉第效率和20小时的稳定性，所有这些都与自供电水裂解的最佳报道相当。这是由于Fe掺杂降低了CoS 2上H吸附和NH_2NH_2吸附脱氢的自由能变化。
Splitting hydrazine into H2 and N2 by electro-catalyzing hydrogen evolution and hydrazine oxidation reactions is promising for replacing fossil energy with H2. However, current hydrazine splitting is achieved using external powers to drive the two reactions, which is inapplicable to outdoor use. Here, Fe-doped CoS2 nanosheets are developed as a bifunctional electrocatalyst for the two reactions, by which direct hydrazine fuel cells and overall-hydrazine-splitting units are realized and integrated to form a self-powered H2 production system. Without external powers, this system employs hydrazine bifunctionally as the fuel of direct hydrazine fuel cell and the splitting target, namely a sole consumable, and exhibits an H2 evolution rate of 9.95 mmol h−1, a 98% Faradaic efficiency and a 20-h stability, all comparable to the best reported for self-powered water splitting. These performances are due to that Fe doping decreases the free-energy changes of H adsorption and adsorbed NH2NH2 dehydrogenation on CoS2.
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