Volume 1 Issue 6 June 2016

Volume 1 Issue 6

Great winds of China

China has the world’s largest installed wind capacity, yet its electricity generation from wind is not on par with that of the US. Lu et al. quantify the relative contributions of wind power curtailment, lower turbine quality and delayed grid connection to the sub-optimal electricity generation in China.

See Lu et al. 1, 16061 (2016) and News & Views by Joanna Lewis, article 16076.

Image: © Elysee Shen/Moment Open/Getty. Cover design: Alex Wing.

Editorial

  • Editorial |

    With the accelerating pace of energy technology development and diffusion around the world, more must be done to ensure that our electricity systems are able to adapt to current and future changes.

Feature

  • Feature |

    Through more transparent, and better targeted and smaller subsidies, India's government hopes to improve energy access for its neediest people.

    • Lucas Laursen

Research Highlights

News & Views

  • News and Views |

    Redox mediators facilitate the oxidation of the highly insulating discharge product in metal–oxygen batteries during recharge and offer opportunities to achieve high reversible capacities. Now a design principle for selecting redox mediators that can recharge the batteries more efficiently is suggested.

    • Stefan A. Freunberger
  • News and Views |

    Combatting climate change is often considered to bring about security of energy supply by reducing reliance on imports. By modelling the impact of pursuing energy security policies, a study now finds that the inverse situation is less advantageous for the global climate.

    • Vaibhav Chaturvedi
  • News and Views |

    China has the largest installed capacity of wind farms, yet its wind energy electricity output is lower than that of other countries. A new analysis of the relative contributions of the factors influencing China's wind sector could help policy makers prioritize solutions.

    • Joanna I. Lewis
  • News and Views |

    Coupling high ionic and low electronic conductivity in the electrolyte of low-temperature solid-oxide fuel cells remains a challenge. Now, the electronic conductivity of a perovskite electrolyte, which has high proton conductivity, is shown to be heavily suppressed when exposed to hydrogen, leading to high fuel cell performance.

    • Wei Zhou
    •  & Zongping Shao

Review

  • Perspective |

    Organometal halide perovskites have drawn remarkable attention in photovoltaic applications due to their optoelectronic properties. In this Perspective, the authors outline the potential of these materials in a variety of energy-related applications.

    • Wei Zhang
    • , Giles E. Eperon
    •  & Henry J. Snaith
  • Review Article |

    The development of supercapacitors requires fundamental understanding of the ion adsorption and charge storage mechanism. Salanne et al. review both chemical and physical aspects of the mechanism in carbon- and oxide-based supercapacitors.

    • M. Salanne
    • , B. Rotenberg
    • , K. Naoi
    • , K. Kaneko
    • , P.-L. Taberna
    • , C. P. Grey
    • , B. Dunn
    •  & P. Simon

Research

  • Article |

    Soluble catalysts such as redox mediators are promising in enhancing energy efficiency of Li–O2 batteries. Here, the authors propose a design principle for finding efficient redox mediators and demonstrate the application of such a new catalyst.

    • Hee-Dae Lim
    • , Byungju Lee
    • , Yongping Zheng
    • , Jihyun Hong
    • , Jinsoo Kim
    • , Hyeokjo Gwon
    • , Youngmin Ko
    • , Minah Lee
    • , Kyeongjae Cho
    •  & Kisuk Kang
  • Article |

    CdTe solar cells have not reached their full efficiency potential, in part because their voltages have lagged behind those of cells made from other semiconductors. Zhao et al. report monocrystalline CdTe solar cells with open-circuit voltages up to 1.1 V and conversion efficiencies up to 17%.

    • Yuan Zhao
    • , Mathieu Boccard
    • , Shi Liu
    • , Jacob Becker
    • , Xin-Hao Zhao
    • , Calli M. Campbell
    • , Ernesto Suarez
    • , Maxwell B. Lassise
    • , Zachary Holman
    •  & Yong-Hang Zhang
  • Article |

    The ability of photovoltaic devices to harvest solar energy can be enhanced by tailoring the spectrum of incident light with thermophotovoltaic devices. Bierman et al. now show that one such device achieves a solar-to-electrical efficiency of 6.8%, exceeding that of the solar cell alone.

    • David M. Bierman
    • , Andrej Lenert
    • , Walker R. Chan
    • , Bikram Bhatia
    • , Ivan Celanović
    • , Marin Soljačić
    •  & Evelyn N. Wang
  • Analysis |

    Several factors, such as wind power curtailment and quality of turbines, cause a reduced capacity of wind energy production in China compared with the US. The authors quantify the relative weight that these factors have in limiting the wind power output in China, and provide policy recommendations.

    • Xi Lu
    • , Michael B. McElroy
    • , Wei Peng
    • , Shiyang Liu
    • , Chris P. Nielsen
    •  & Haikun Wang
  • Analysis |

    Climate policies are frequently argued to achieve energy independence as an additional benefit. Jewell et al. use five energy-economy models to show that the opposite is not true: constraining energy imports is much cheaper than climate change mitigation but would not significantly reduce emissions.

    • Jessica Jewell
    • , Vadim Vinichenko
    • , David McCollum
    • , Nico Bauer
    • , Keywan Riahi
    • , Tino Aboumahboub
    • , Oliver Fricko
    • , Mathijs Harmsen
    • , Tom Kober
    • , Volker Krey
    • , Giacomo Marangoni
    • , Massimo Tavoni
    • , Detlef P. van Vuuren
    • , Bob van der Zwaan
    •  & Aleh Cherp