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首页> 外文期刊>Catalysis science & technology >An in situ grown lanthanum sulfide/molybdenum sulfide hybrid catalyst for electrochemical hydrogen evolution
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An in situ grown lanthanum sulfide/molybdenum sulfide hybrid catalyst for electrochemical hydrogen evolution

机译：一个原位生长硫化镧/钼硫化混合催化剂电化学氢进化

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Hydrogen has great promise as an energy carrier superior to traditional fossil fuels. Electrochemical water splitting is expected to be an effective and sustainable method for producing high-purity hydrogen fuel cleanly. The hydrogen evolution reaction (HER) is the cathodic reaction in the electrochemical water-splitting process and requires efficient catalysts. However, the state-of-the-art Pt suffers from high cost and rare reserves, which significantly limit its extensive applications in the hydrogen evolution reaction for water splitting. Although its catalytic activity still falls far short of expectations, molybdenum sulfide has emerged as one of the most promising catalysts for HER due to its abundant reserves and high tunability. Here, we have reported the synthesis and HER catalytic performance of a hybrid lanthanum sulfide/molybdenum sulfide (La2S3-MoS2) catalyst. The formation of molybdenum sulfide nanosheets in situ with lanthanum sulfide deposition was achieved through a facile one-pot solvothermal strategy. The present catalyst displayed much superior activity for HER to pristine and commercial molybdenum sulfide; low overpotentials of 205 mV, 277 mV, 336 mV and 455 mV for the current densities of 10 mA cm(-2), 50 mA cm(-2), 100 mA cm(-2) and 200 mA cm(-2) were obtained, respectively, together with a low Tafel slope of 51 mV dec(-1). Moreover, the present catalyst exhibited excellent stability in long-term hydrogen evolution. The remarkable HER performance might be mainly due to the expanded interlayer distance and the nano-interfaces between the molybdenum sulfide and lanthanum sulfide segments, which induced an increased exposure of active sites and a modified surface electronic structure.
机译：氢作为能量载体有巨大的希望优于传统的化石燃料。电化学水分裂有望一个有效的和可持续的方法生产高纯氢燃料干净。进化反应(她)阴极反应在电化学水分解的过程,需要高效的催化剂。最先进的Pt患有高成本罕见的储备,这大大限制了它广泛应用在氢进化水分解反应。催化活性仍远不及预期,硫化钼已成为为她的一个最有前途的催化剂其丰富的储备,可调谐性高。在这里,我们报告的合成和她催化性能的混合镧硫化/硫化钼(La2S3-MoS2)催化剂。硫化钼nanosheets的形成现场与镧硫化物沉积通过一个简单锅solvothermal策略。为她的原始和优越的活动商业硫化钼;205号,277号,336号,455 mV电流密度的马10厘米(2),(2)马50厘米,马马100 cm(2), 200厘米(2)得到,分别与低塔费尔的斜率51号12月(1)。表现出优秀的长期稳定氢进化。可能主要是由于扩展性能层间距离和nano-interfaces硫化钼和镧硫化段,诱导增加暴露的活跃网站和修改后的表面电子结构。

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