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Engineering interfacial structures to accelerate hydrogen evolution efficiency of MoS2 over a wide pH range
Nanoscale ( IF 5.8 ) Pub Date : 2020/02/19 , DOI: 10.1039/d0nr00008f Shasha Li 1, 2, 3, 4, 5 , Suchada Sirisomboonchai 6, 7, 8, 9 , Xiaowei An 6, 7, 8, 9 , Xuli Ma 4, 10, 11, 12 , Peng Li 1, 2, 3, 4 , Lixia Ling 3, 4, 11, 13 , Xiaogang Hao 3, 4, 11, 13 , Abuliti Abudula 6, 7, 8, 9 , Guoqing Guan 5, 7, 9, 14, 15
Nanoscale ( IF 5.8 ) Pub Date : 2020/02/19 , DOI: 10.1039/d0nr00008f Shasha Li 1, 2, 3, 4, 5 , Suchada Sirisomboonchai 6, 7, 8, 9 , Xiaowei An 6, 7, 8, 9 , Xuli Ma 4, 10, 11, 12 , Peng Li 1, 2, 3, 4 , Lixia Ling 3, 4, 11, 13 , Xiaogang Hao 3, 4, 11, 13 , Abuliti Abudula 6, 7, 8, 9 , Guoqing Guan 5, 7, 9, 14, 15
Affiliation
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Developing low-cost electrocatalysts with outstanding electrochemical performance for water splitting over a wide pH range is urgently desired to meet the practical needs in different areas. Herein, a highly efficient hierarchical flower-like CoS2@MoS2 core–shell nanostructured electrocatalyst is fabricated by a two-step strategy, in which MoS2 nanosheets with a layered structure are grown on the CoS2 core supported on carbon paper (CP) and used as hydrogen evolution reaction (HER) electrocatalysts working in the whole pH range (0–14). Remarkably, benefiting from the interface-engineering in this 3D core–shell structure of the electrocatalyst, the optimum CoS2@MoS2/CP catalyst exhibits outstanding HER activity over a wide range of pH values and an overpotential of 69 mV in acidic solution, 145 mV in neutral solution and 82 mV in alkaline solution, respectively, to afford the standard current density of 10 mA cm−2. Furthermore, it demonstrates superior stability under different pH conditions for at least 48 h. Density functional theory (DFT) calculations are performed to gain further insight into the effect of CoS2@MoS2 interfaces, revealing that the strong interfacial interaction between CoS2 and MoS2 dramatically reduces the Gibbs free energy of hydrogen adsorption and the energy barrier for water dissociation, thus enhancing the electrochemical HER activity in the whole pH range (0–14).
中文翻译：
工程界面结构可在较宽的pH范围内加快MoS2的氢气释放效率
为了满足不同领域的实际需要，迫切需要开发出具有优异电化学性能的低成本电催化剂，用于在宽pH范围内进行水分解。在这里，高效的分层花状CoS 2 @MoS 2核壳纳米结构电催化剂是通过两步策略制造的，其中具有分层结构的MoS 2纳米片生长在碳纸支撑的CoS 2核上（CP ），并用作在整个pH范围（0-14）下工作的析氢反应（HER）电催化剂。值得注意的是，得益于这种3D电催化剂核-壳结构的界面工程，最佳的CoS 2 @MoS 2/ CP催化剂在宽的pH值范围内均表现出出色的HER活性，在酸性溶液中的过电势分别为69 mV，在中性溶液中的过电势为145 mV和碱性溶液的过电势分别为10 m cm -2。此外，它显示出在不同pH条件下至少48小时的优异稳定性。进行密度泛函理论（DFT）计算以进一步了解CoS 2 @MoS 2界面的影响，揭示了CoS 2和MoS 2之间的强界面相互作用 大大降低了氢吸附的吉布斯自由能和水离解的能垒，从而在整个pH范围（0-14）中增强了电化学HER活性。
更新日期：2020-03-27
中文翻译：
工程界面结构可在较宽的pH范围内加快MoS2的氢气释放效率
为了满足不同领域的实际需要，迫切需要开发出具有优异电化学性能的低成本电催化剂，用于在宽pH范围内进行水分解。在这里，高效的分层花状CoS 2 @MoS 2核壳纳米结构电催化剂是通过两步策略制造的，其中具有分层结构的MoS 2纳米片生长在碳纸支撑的CoS 2核上（CP ），并用作在整个pH范围（0-14）下工作的析氢反应（HER）电催化剂。值得注意的是，得益于这种3D电催化剂核-壳结构的界面工程，最佳的CoS 2 @MoS 2/ CP催化剂在宽的pH值范围内均表现出出色的HER活性，在酸性溶液中的过电势分别为69 mV，在中性溶液中的过电势为145 mV和碱性溶液的过电势分别为10 m cm -2。此外，它显示出在不同pH条件下至少48小时的优异稳定性。进行密度泛函理论（DFT）计算以进一步了解CoS 2 @MoS 2界面的影响，揭示了CoS 2和MoS 2之间的强界面相互作用 大大降低了氢吸附的吉布斯自由能和水离解的能垒，从而在整个pH范围（0-14）中增强了电化学HER活性。
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