Ulm University , Institute of Inorganic Chemistry I , Albert-Einstein-Allee 11 , 89081 Ulm , Germany.
Key Laboratory of Green Process and Engineering, Institute of Process Engineering , Chinese Academy of Sciences , 100190 , Beijing , China.
ACS Appl Mater Interfaces. 2018 Dec 26;10(51):44511-44517. doi: 10.1021/acsami.8b16578. Epub 2018 Dec 14.
The oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are key catalytic processes for sustainable energy technologies, such as water electrolysis or fuel cells. Here, a novel metal oxide-nanostructured carbon composite is reported, which acts as OER and ORR electrocatalyst under technologically relevant conditions. A facile synthetic process allows the deposition of a molecular manganese vanadium oxide precursor, [MnVO(OAc)], on reduced graphene oxide. Simultaneously, the precursor is converted into insoluble nanostructured solid-state Mn-V-oxide catalysts. Control of the synthetic conditions allows tuning of the electrocatalytic properties of the composites, leading to excellent and stable electrochemical reactivity. The electrocatalytic ORR and OER activity was evaluated in alkaline aqueous electrolyte and showed performance comparable with commercial Pt/C electrocatalysts. The study thus demonstrates how polyoxometalate precursors based on earth-abundant elements can be deposited on nanostructured carbon to give high-performance OER/ORR catalysts for alkaline water electrolysis. A new class of composite catalysts can in future be accessed by a facile fabrication route.
氧析出反应（OER）和氧还原反应（ORR）是可持续能源技术（如水电解或燃料电池）的关键催化过程。在此，报告了一种新型的金属氧化物-纳米结构碳复合材料，它在技术相关条件下可作为 OER 和 ORR 电催化剂。通过简便的合成工艺，可以将分子锰钒氧化物前体[MnVO（OAc）]沉积在还原氧化石墨烯上。同时，前体转化为不溶性纳米结构固态 Mn-V-氧化物催化剂。控制合成条件可以调整复合材料的电催化性能，从而获得优异且稳定的电化学活性。在碱性水溶液电解质中评估了电催化 ORR 和 OER 活性，表现出与商业 Pt/C 电催化剂相当的性能。因此，该研究展示了如何在纳米结构碳上沉积基于丰富元素的多金属氧酸盐前体，以获得用于碱性水电解的高性能 OER/ORR 催化剂。未来，可以通过简便的制造路线获得一类新的复合催化剂。
