当前位置：
X-MOL 学术
›
Adv. Energy Mater.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Charge State Manipulation of Cobalt Selenide Catalyst for Overall Seawater Electrolysis
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-09-14 , DOI: 10.1002/aenm.201801926 Yongqiang Zhao 1 , Bo Jin 1 , Yao Zheng 1 , Huanyu Jin 1 , Yan Jiao 1 , Shi-Zhang Qiao 1, 2
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-09-14 , DOI: 10.1002/aenm.201801926 Yongqiang Zhao 1 , Bo Jin 1 , Yao Zheng 1 , Huanyu Jin 1 , Yan Jiao 1 , Shi-Zhang Qiao 1, 2
Affiliation
|
Facile and controllable fabrication of highly active and stable bifunctional electrocatalysts for water electrolysis is important for hydrogen production. 3D cobalt selenide electrodes with CoSe and Co9Se8 phases are synthesized by one‐step calcination of Co foil with Se powder in a vacuum‐sealed ampoule. The charge state of Co species and the electrocatalytic performance of the prepared catalysts are manipulated by controlling Co to Se mass ratio. Mechanistic studies show that a high Co charge state favors oxygen evolution reaction performance and a low Co charge state promotes hydrogen evolution reaction activity for as‐prepared cobalt selenide electrocatalysts. The resultant materials can act as free‐standing bifunctional electrocatalytic electrodes for oxygen evolution reaction and hydrogen evolution reaction in alkaline media. Moreover, a 10.3 mA cm−2 current density at 1.8 V is achieved for overall seawater electrolysis through exploiting as‐synthesized cobalt selenide electrodes as both anode and cathode, which is three times higher than that for novel‐metal‐based seawater electrolyzer at the same voltage (2.9 mA cm−2). Experimental results reveal that the cobalt selenide electrodes show significantly higher electrocatalytic performance than that of integrated Ni/Ir–C and Ni/Pt–C electrodes. Consequently, these novel bifunctional electrodes are promising candidates for realistic large‐scale water electrolysis.
中文翻译：
硒化钴催化剂在整个海水中的荷电状态操纵
高效且稳定的用于水电解的高活性和稳定双功能电催化剂的制备对于制氢很重要。具有CoSe和Co 9 Se 8的3D硒化钴电极通过在真空密封的安瓿瓶中将Co箔与Se粉末一步煅烧来合成两相。通过控制Co与Se的质量比来控制Co种类的电荷状态和制备的催化剂的电催化性能。机理研究表明，对于制备的硒化钴电催化剂，高的Co电荷态有利于氧的放出反应性能，而低的Co电荷态则有利于氢的放出反应活性。所得材料可用作碱性介质中的氧释放反应和氢释放反应的独立式双功能电催化电极。此外，10.3 mA cm -2通过使用合成的硒化钴电极作为阳极和阴极，可以实现整个海水电解在1.8 V时的电流密度，这是在相同电压（2.9 mA cm -2）下基于新型金属的海水电解槽的三倍。）。实验结果表明，硒化钴电极比集成的Ni / Ir–C和Ni / Pt–C电极具有更高的电催化性能。因此，这些新颖的双功能电极是实际大规模水电解的有希望的候选者。
更新日期：2018-09-14
中文翻译：
硒化钴催化剂在整个海水中的荷电状态操纵
高效且稳定的用于水电解的高活性和稳定双功能电催化剂的制备对于制氢很重要。具有CoSe和Co 9 Se 8的3D硒化钴电极通过在真空密封的安瓿瓶中将Co箔与Se粉末一步煅烧来合成两相。通过控制Co与Se的质量比来控制Co种类的电荷状态和制备的催化剂的电催化性能。机理研究表明，对于制备的硒化钴电催化剂，高的Co电荷态有利于氧的放出反应性能，而低的Co电荷态则有利于氢的放出反应活性。所得材料可用作碱性介质中的氧释放反应和氢释放反应的独立式双功能电催化电极。此外，10.3 mA cm -2通过使用合成的硒化钴电极作为阳极和阴极，可以实现整个海水电解在1.8 V时的电流密度，这是在相同电压（2.9 mA cm -2）下基于新型金属的海水电解槽的三倍。）。实验结果表明，硒化钴电极比集成的Ni / Ir–C和Ni / Pt–C电极具有更高的电催化性能。因此，这些新颖的双功能电极是实际大规模水电解的有希望的候选者。
京公网安备 11010802027423号