Wu Fang, Guo Xiaoxue, Hao Gazi, Hu Yubing, Jiang Wei
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Nanoscale. 2019 Aug 8;11(31):14785-14792. doi: 10.1039/c9nr03430g.
Exploring Earth-abundant electrocatalysts that are highly efficient, low cost, and stable for the oxygen evolution reaction (OER) are critical to energy storage and water splitting. Metal-organic frameworks (MOFs) have been regarded as superior electrocatalysts due to their atomically dispersed metal ions. Currently, MOFs have been widely studied as templates to fabricate electrocatalysts through thermal annealing. Here, we report a novel synthetic approach to fabricate a Ni-S/MIL-53(Fe) electrode by electrodepositing sulfur-engineered amorphous nickel hydroxides on MIL-53(Fe) nanosheets. The obtained binder-free, self-supported Ni-S/MIL-53(Fe) shows high OER activity with overpotentials of 256 and 298 mV to achieve 10 and 100 mA cm-2, respectively. Moreover, it also exhibits excellent electrochemical stability with no obvious degradation at 100 mA cm-2 for at least 40 h. The new findings may pave a new avenue for designing and fabricating low-cost catalysts with high efficiency for electrochemical applications.
探索对析氧反应（OER）高效、低成本且稳定的地球丰富型电催化剂对能量存储和水分解至关重要。金属有机框架（MOF）因其原子分散的金属离子而被视为优异的电催化剂。目前，MOF作为模板通过热退火来制备电催化剂已得到广泛研究。在此，我们报道一种新颖的合成方法，通过在MIL-53(Fe)纳米片上电沉积硫工程化的非晶态氢氧化镍来制备Ni-S/MIL-53(Fe)电极。所获得的无粘结剂、自支撑的Ni-S/MIL-53(Fe)表现出高析氧活性，分别在过电位为256和298 mV时实现10和100 mA cm-2的电流密度。此外，它还表现出优异的电化学稳定性，在100 mA cm-2下至少40小时无明显降解。这些新发现可能为设计和制造用于电化学应用的高效低成本催化剂开辟一条新途径。
