A Highly-Efficient and Stable Catalyst based on Co(OH)2@Ni Electroplated on Cu-Metallized Cotton Textile for Water Splitting.
A Highly-Efficient and Stable Catalyst based on Co(OH)2@Ni Electroplated on Cu-Metallized Cotton Textile for Water Splitting.
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DOI：
10.1021/acsami.9b07371
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发表时间：
2019-07
影响因子：
9.5
通讯作者：
Zining Wang;S. Ji;Fusheng Liu;Hui Wang;Xu-yun Wang;Qizhao Wang;B. Pollet;Rongfang Wang
中科院分区：
文献类型：
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作者：
Zining Wang;S. Ji;Fusheng Liu;Hui Wang;Xu-yun Wang;Qizhao Wang;B. Pollet;Rongfang Wang
使用可再生能源为水电解槽提供动力的概念被视为生产绿色和可持续氢的有利方法。双功能催化剂对OER（析氧反应）和HER（析氢反应）均有活性，可以显著有效地促进电化学水分解。本文设计并制备了一种稳定、高性能的电催化剂（Co(OH)2@Ni），该催化剂基于杂化金属/氢氧化物纳米片阵列电镀在金属化铜棉织物上。结果表明：α-Co(OH)2纳米片在金属化棉织物上均匀地形成，优化后的Co(OH)2@Ni样品在10 mA cm-2下的过电位为+96 mV，具有优异的HER稳定性。制备的催化剂对OER表现出优异的电化学活性和耐久性，与传统的贵金属基催化剂相当。此外，当Co(OH)2@Ni作为电极组装在1 M KOH的水电解槽中时，在10 mA cm-2的电流密度下获得了1.640 V的电池电压，使其在实际应用中成为一种很有前景的双功能电解催化剂。
The concept of using renewable energy to power water electrolyzers is seen as a favorable approach for the production of green and sustainable hydrogen. The electrochemical water splitting can be significantly and efficiently enhanced by using bifunctional catalysts, active towards both the OER (oxygen evolution reaction) and the HER (hydrogen evolution reaction). Herein, a stable and highly performing catalyst based upon hybrid metal/metal hydroxide nanosheet arrays electroplated onto Cu-metallized cotton textile (Co(OH)2@Ni) was designed and fabricated as a bifunctional electrocatalyst for the complete water splitting reactions. It was found that the interconnected α-Co(OH)2 nanosheets were evenly formed onto the metalized cotton textile, and the optimized Co(OH)2@Ni sample exhibited an overpotential of +96 mV at 10 mA cm-2, with excellent stability towards the HER. The as-prepared catalyst also showed superior electrochemical activity and durability towards the OER, which was found to be comparable to conventional precious group metal (PGM)-based catalysts. In addition, when Co(OH)2@Ni were assembled as the electrodes in a water electrolyzer (1 M KOH), a cell voltage of 1.640 V was achieved at a current density of 10 mA cm-2, enabling it to be a promising bifunctional catalyst for water electrolysis in real applications.