Hu Yi,Xu Jingsong,Zhang Tianzhu,Zhong Hang,Chen Jun,Liu Xinai,Pan Qifa,Liu Ruidong,Jiang Chunli,Chen Jun
Electrocatalytic water splitting to produce hydrogen is a promising route to provide green hydrogen on a large scale. To explore non-noble metal electrocatalysts with high performance is still a challenge. Herein, a one-step electrodeposition way is developed to construct the heterostructural (NiO-La 2 O 3 )/(Ni-La)/NiO/Ni electrocatalysts on Ni foam. The dark Ni-La coating was prepared by co-electrodeposition from an aqueous solution containing LaCl 3 and NiCl 2 with a molar concentration ratio of 1:5. Among these heterostructural Ni-based electrocatalysts, an excellent HER activity is achieved: an overpotential of 22 mV at the current density of 10 mA cm −2 in 1 M KOH solution. It is demonstrated that the introduction of La significantly reduces the overpotential for HER. The higher the La content in the Ni-La coating of these electrocatalysts, the better the electrocatalytic HER performance was exhibited. This work provides a facile and inexpensive route to prepare Ni-La coating on electrodes in an aqueous solution.
The electrochemical water splitting in alkaline media is troubled by the lack of efficient electrocatalysts for hydrogen evolution reaction (HER). Herein, a crystalline/amorphous CoP/MnO x heterostructure is converted from a single-phase bimetallic Co–Mn oxide by phase separation strategy. The CoP/MnO x heterostructure only requires an overpotential of 135 mV to reach 10 mA cm −2 in 1 M KOH, which is lower than that of CoP (184 mV). The interface effect between CoP and MnO x is beneficial to the improvement of HER activity, which is confirmed by means of selective etching of MnO x and infrared spectroscopy . Moreover, the crystal size of CoP phase in the heterostructure is lower than that of the mono-component CoP. Furthermore, the decrease of precursor crystal size will give rise to a decrease in the CoP crystal size of heterostructure. The decline of crystal size results in higher active surface area and greater number of interfaces.
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