Chen Ming, Hu Yiping, Liang Kun, Zhao Ziming, Luo Yutong, Luo Sha, Ma Jiantai
State Key Laboratory of Applied Organic Chemistry (SKLAOC), Gansu Provincial Engineering Laboratory for Chemical Catalysis, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, PR China.
Nanoscale. 2021 Nov 18;13(44):18763-18772. doi: 10.1039/d1nr04540g.
Finding an efficient, stable and cheap oxygen evolution reaction (OER) catalyst is very important for renewable energy conversion systems. There are relatively few related research reports due to the thermodynamic instability of transition metal sulfides (TMSs) at the oxidation potential and these are usually focused on single metal sulfides or bimetal sulfides. Metal sulfide mixture systems are rarely studied. The fabrication of a TMS/TMS interface is a feasible method to improve the kinetics of the OER. Here, we constructed TMS hybrid electrocatalysts with multiple phase interfaces for the oxygen evolution reaction, named S-CoFe/CNTs. The results show that the S-CoFe/CNT catalyst exhibits a low overpotential of 258 mV to achieve a current density of 10 mA cm, and has high activity in the OER process. Meanwhile, the catalyst also shows a low Tafel slope (69 mV dec) and good stability. This can be attributed to the synergistic catalysis of the multiphase interface in the catalyst and the rapid electron transfer pathway brought by CNTs. The new strategy for the synthesis of catalysts containing the TMS/TMS interface provides a new idea and method for the development of efficient and practical water splitting catalysts.
找到一种高效、稳定且廉价的析氧反应（OER）催化剂对于可再生能源转换系统非常重要。由于过渡金属硫化物（TMSs）在氧化电位下的热力学不稳定性，相关研究报告相对较少，且这些研究通常集中在单一金属硫化物或双金属硫化物上。金属硫化物混合体系很少被研究。构建TMS/TMS界面是改善OER动力学的一种可行方法。在此，我们构建了用于析氧反应的具有多相界面的TMS混合电催化剂，命名为S-CoFe/CNTs。结果表明，S-CoFe/CNT催化剂在电流密度达到10 mA cm时表现出258 mV的低过电位，并且在OER过程中具有高活性。同时，该催化剂还显示出低塔菲尔斜率（69 mV dec）和良好的稳定性。这可归因于催化剂中多相界面的协同催化作用以及CNTs带来的快速电子转移途径。合成含TMS/TMS界面催化剂的新策略为开发高效实用的水分解催化剂提供了新思路和方法。
