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Cobalt Sulfide/Nickel Sulfide Heterostructure Directly Grown on Nickel Foam: An Efficient and Durable Electrocatalyst for Overall Water Splitting Application
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-07-25 00:00:00 , DOI: 10.1021/acsami.8b04223 Subhasis Shit 1 , Suman Chhetri 1, 2 , Wooree Jang 3 , Naresh C. Murmu 1, 2 , Hyeyoung Koo 3 , Pranab Samanta 1, 2 , Tapas Kuila 1, 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-07-25 00:00:00 , DOI: 10.1021/acsami.8b04223 Subhasis Shit 1 , Suman Chhetri 1, 2 , Wooree Jang 3 , Naresh C. Murmu 1, 2 , Hyeyoung Koo 3 , Pranab Samanta 1, 2 , Tapas Kuila 1, 2
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Fabrication of high-performance noble-metal-free bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in water is a promising strategy toward future carbon-neutral economy. Herein, a one-pot hydrothermal synthesis of cobalt sulfide/nickel sulfide heterostructure supported by nickel foam (CoSx/Ni3S2@NF) was performed. The Ni foam acted as the three-dimensional conducting substrate as well as the source of nickel for Ni3S2. The formation of CoSx/Ni3S2@NF was confirmed by X-ray diffraction and X-ray photoelectron spectroscopy. The formation of CoSx/Ni3S2@NF facilitated easy charge transport and showed synergistic electrocatalytic effect toward HER, OER, and overall water splitting in alkaline medium. Remarkably, CoSx/Ni3S2@NF showed catalytic activity comparable with that of benchmarking electrocatalysts Pt/C and RuO2. For CoSx/Ni3S2@NF, overpotentials of 204 and 280 mV were required to achieve current densities of 10 and 20 mA cm–2 for HER and OER, respectively, in 1.0 M KOH solution. A two-electrode system was formulated for overall water splitting reaction, which showed current densities of 10 and 50 mA cm–2 at 1.572 and 1.684 V, respectively. The prepared catalyst exhibited excellent durability in HER and OER catalyzing conditions and also in overall water splitting operation. Therefore, CoSx/Ni3S2@NF could be a promising noble-metal-free electrocatalyst for overall water splitting application.
中文翻译：
直接在镍泡沫上生长的硫化钴/硫化镍异质结构：用于整体水分解应用的高效耐用的电催化剂
制备用于水中的氢气释放反应（HER）和氧气释放反应（OER）的高性能无贵金属双功能电催化剂是实现未来碳中和经济的有前途的策略。在此，一锅法水热合成镍泡沫（CoS x / Ni 3 S 2 @NF）支撑的硫化钴/硫化镍异质结构。镍泡沫既是三维导电基底，又是Ni 3 S 2的镍源。通过X射线衍射和X射线光电子能谱确认了CoS x / Ni 3 S 2 @NF的形成。CoS x / Ni的形成3 S 2 @NF促进了电荷的轻松转移，并在碱性介质中表现出对HER，OER和总水分解的协同电催化作用。值得注意的是，CoS x / Ni 3 S 2 @NF的催化活性与基准电催化剂Pt / C和RuO 2相当。对于CoS x / Ni 3 S 2 @NF ，在1.0 M KOH溶液中，要使HER和OER的电流密度分别达到10和20 mA cm –2，就需要204和280 mV的超电势。制定了用于整体水分解反应的两电极系统，其电流密度为10和50 mA cm –2分别在1.572和1.684 V下 所制备的催化剂在HER和OER催化条件下以及在整个水分解操作中均显示出优异的耐久性。因此，CoS x / Ni 3 S 2 @NF可能是一种有希望的用于整体水分解应用的无贵金属电催化剂。
更新日期：2018-07-25
中文翻译：
直接在镍泡沫上生长的硫化钴/硫化镍异质结构：用于整体水分解应用的高效耐用的电催化剂
制备用于水中的氢气释放反应（HER）和氧气释放反应（OER）的高性能无贵金属双功能电催化剂是实现未来碳中和经济的有前途的策略。在此，一锅法水热合成镍泡沫（CoS x / Ni 3 S 2 @NF）支撑的硫化钴/硫化镍异质结构。镍泡沫既是三维导电基底，又是Ni 3 S 2的镍源。通过X射线衍射和X射线光电子能谱确认了CoS x / Ni 3 S 2 @NF的形成。CoS x / Ni的形成3 S 2 @NF促进了电荷的轻松转移，并在碱性介质中表现出对HER，OER和总水分解的协同电催化作用。值得注意的是，CoS x / Ni 3 S 2 @NF的催化活性与基准电催化剂Pt / C和RuO 2相当。对于CoS x / Ni 3 S 2 @NF ，在1.0 M KOH溶液中，要使HER和OER的电流密度分别达到10和20 mA cm –2，就需要204和280 mV的超电势。制定了用于整体水分解反应的两电极系统，其电流密度为10和50 mA cm –2分别在1.572和1.684 V下 所制备的催化剂在HER和OER催化条件下以及在整个水分解操作中均显示出优异的耐久性。因此，CoS x / Ni 3 S 2 @NF可能是一种有希望的用于整体水分解应用的无贵金属电催化剂。
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