Research / 2019 / Article / Fig 7

Research Article

Highly Efficient and Stable Hydrogen Production in All pH Range by Two-Dimensional Structured Metal-Doped Tungsten Semicarbides

Figure 7

DFT calculations. (a) Atomistic configuration of Ni-W2C nanosheet (T, H1, and H2 are the possible adsorption sites for H on W2C nanosheet; 1-4 are the possible adsorption sites for H on Ni-W2C nanosheet). (b) Gibbs free-energies for H adsorbed at sites 1-4 on Ni-W2C nanosheet. (c) Atomistic configuration of Ni-W2C nanosheet at high hydrogen adsorption coverage. (d) Free-energy diagrams for HER of W2C and Ni-W2C high hydrogen adsorption coverage.