Rationally designing efficient and low-price bifunctional electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are vitally important to bring solar/electrical-to-hydrogen energy conversion processes into reality. Herein, we report on a synthetic method that leads to an in situ growth of ultrathin MoS₂ nanosheets and transition metal disulfide nanocubes onto the surface of Fe_1/3Co_1/3Ni_1/3MoO₄ nanorods for the first time. Such hybrids are found to serve as a bifunctional electrocatalyst with high activities for OER and HER, as represented by an impressive anodic and cathodic current density of 10 mA cm^–2 at 1.53 and −0.25 V, respectively. More importantly, the performance for OER is even better than that of IrO₂, the conventional noble metal electrocatalyst. These striking observations were interpreted in terms of the combination of strongly synergistic effect of multimetal components, large amount of exposed active site, and superaerophobia. The present methodology has been confirmed universal for synthesizing other molybdate solid solutions, which would open up new possibilities for designing novel non-noble bifunctional electrocatalysts for OER and HER.

中文翻译：

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MoS ₂纳米片阵列和TS ₂（T = Fe，Co和Ni）纳米立方体在钼酸盐上的原位生长，用于有效的氧释放反应和改进的氢释放反应

合理设计用于氧释放反应（OER）和氢释放反应（HER）的高效且价格低廉的双功能电催化剂，对于实现太阳能/电到氢的能量转化过程至关重要。在本文中，我们报道了一种合成方法，该方法首次导致超薄MoS ₂纳米片和过渡金属二硫化物纳米立方体在Fe _1/3 Co _1/3 Ni _1/3 MoO ₄纳米棒的表面上原位生长。已发现这类杂化物可作为双功能电催化剂，对OER和HER具有高活性，其阳极和阴极的电流密度高达10 mA cm ^–2令人印象深刻。分别为1.53和-0.25 V. 更重要的是，OER的性能甚至优于常规贵金属电催化剂IrO ₂的性能。这些惊人的观察结果是根据多金属组分的强协同作用，大量暴露的活性位点和超级厌氧症的组合来解释的。已经证实本方法学可用于合成其他钼酸盐固溶体，这将为设计用于OER和HER的新型非贵金属双功能电催化剂开辟新的可能性。