In-situ formation of unsaturated defect sites on converted CoNi alloy/Co-Ni LDH to activate MoS2 nanosheets for pH-universal hydrogen evolution reaction
In-situ formation of unsaturated defect sites on converted CoNi alloy/Co-Ni LDH to activate MoS2 nanosheets for pH-universal hydrogen evolution reaction
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DOI：
10.1016/j.cej.2021.128556
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发表时间：
2021-01-29
影响因子：
15.1
通讯作者：
Lai, Yuekun
中科院分区：
文献类型：
--
作者：
Dong, Jianing;Zhang, Xinnan;Lai, Yuekun
开发高活性、高稳定性的非铂基电催化剂是实现“氢经济”的重要途径。本文提出了一种有效的碳纸（CP）上的三维复合电催化剂，该催化剂由原位还原的CoNi（CN）合金和CoNi层状双氢氧化物（CNL）活化的1 T/2 H二硫化钼（MoS 2）组成。由于水活化的界面效应和快速电子转移的相工程作用，CN/CNL/MoS 2/CP具有优异的析氢电催化活性，在较宽的pH范围内具有较低的过电位（在-10 mA/cm（2）下的超电势（eta（10））分别为在0.5 M H2SO 4中112 mV、在1 M KOH中106 mV和在1 M PBS中145 mV）。并对碱性和中性介质中的HER机理进行了详细的讨论。发现CN/CNL的侧边可以促进水解离产生H质子，从而促进CN和MoS 2上的后续步骤以释放H-2。
Developing non-Pt based electrocatalysts that are highly active and stable has attracted much attention to realize the blueprint of the "hydrogen economy". Herein, an efficient 3d hybrids electrocatalyst, consisting of in-situ reduced CoNi (CN) alloys and CoNi layered double hydroxides (CNL) activated 1T/2H molybdenum disulfide (MoS2), on carbon paper (CP) was proposed. Benefited from the interface effect for water activation and phase engineering for fast electron transfer, the CN/CNL/MoS2/CP exhibits excellent electrocatalytic activity for hydrogen evolution reaction (HER) with low overpotentials in a wide pH range (overpotential at -10 mA/cm(2) (eta(10))= 112 mV in 0.5 M H2SO4, 106 mV in 1 M KOH and 145 mV in 1 M PBS, respectively). Moreover, the mechanisms of HER in alkaline and neutral media have been discussed in detail. It was discovered that the edgesides of CN/CNL can promote the water dissociation to generate H protons to facilitate the subsequent steps on CN and MoS2 for the release of H-2.